0032121: Draw Harness, ViewerTest - implement -reset option for vlight command

[occt.git] / src / ViewerTest / ViewerTest_ViewerCommands.cxx

// Created on: 1998-09-01
// Created by: Robert COUBLANC
// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#if defined(_WIN32)
  #include <windows.h>
#endif

#include <ViewerTest.hxx>

#include <AIS_AnimationCamera.hxx>
#include <AIS_AnimationObject.hxx>
#include <AIS_Axis.hxx>
#include <AIS_CameraFrustum.hxx>
#include <AIS_ColorScale.hxx>
#include <AIS_InteractiveContext.hxx>
#include <AIS_LightSource.hxx>
#include <AIS_ListOfInteractive.hxx>
#include <AIS_ListIteratorOfListOfInteractive.hxx>
#include <AIS_Manipulator.hxx>
#include <AIS_ViewCube.hxx>
#include <AIS_Shape.hxx>
#include <AIS_Point.hxx>
#include <Aspect_DisplayConnection.hxx>
#include <Aspect_Grid.hxx>
#include <Aspect_TypeOfLine.hxx>
#include <Draw.hxx>
#include <Draw_Appli.hxx>
#include <Draw_Interpretor.hxx>
#include <Draw_ProgressIndicator.hxx>
#include <gp_Dir.hxx>
#include <gp_Pln.hxx>
#include <gp_Pnt.hxx>
#include <Geom_Axis2Placement.hxx>
#include <Geom_CartesianPoint.hxx>
#include <Graphic3d_ArrayOfPolylines.hxx>
#include <Graphic3d_AspectFillArea3d.hxx>
#include <Graphic3d_AspectMarker3d.hxx>
#include <Graphic3d_ClipPlane.hxx>
#include <Graphic3d_CubeMapPacked.hxx>
#include <Graphic3d_CubeMapSeparate.hxx>
#include <Graphic3d_GraduatedTrihedron.hxx>
#include <Graphic3d_GraphicDriver.hxx>
#include <Graphic3d_GraphicDriverFactory.hxx>
#include <Graphic3d_NameOfTextureEnv.hxx>
#include <Graphic3d_Texture2Dmanual.hxx>
#include <Graphic3d_TextureEnv.hxx>
#include <Graphic3d_TextureParams.hxx>
#include <Graphic3d_TypeOfTextureFilter.hxx>
#include <Image_AlienPixMap.hxx>
#include <Image_Diff.hxx>
#include <Image_VideoRecorder.hxx>
#include <Message.hxx>
#include <Message_ProgressScope.hxx>
#include <Message_ProgressRange.hxx>
#include <NCollection_DataMap.hxx>
#include <NCollection_List.hxx>
#include <NCollection_LocalArray.hxx>
#include <NCollection_Vector.hxx>
#include <OSD.hxx>
#include <OSD_Parallel.hxx>
#include <OSD_Timer.hxx>
#include <Prs3d_ShadingAspect.hxx>
#include <Prs3d_DatumAspect.hxx>
#include <Prs3d_Drawer.hxx>
#include <Prs3d_LineAspect.hxx>
#include <Prs3d_Text.hxx>
#include <Select3D_SensitivePrimitiveArray.hxx>
#include <TColStd_HSequenceOfAsciiString.hxx>
#include <TColStd_SequenceOfInteger.hxx>
#include <TColStd_HSequenceOfReal.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
#include <TColStd_MapOfAsciiString.hxx>
#include <ViewerTest_AutoUpdater.hxx>
#include <ViewerTest_ContinuousRedrawer.hxx>
#include <ViewerTest_EventManager.hxx>
#include <ViewerTest_DoubleMapOfInteractiveAndName.hxx>
#include <ViewerTest_DoubleMapIteratorOfDoubleMapOfInteractiveAndName.hxx>
#include <ViewerTest_CmdParser.hxx>
#include <ViewerTest_V3dView.hxx>
#include <V3d_AmbientLight.hxx>
#include <V3d_DirectionalLight.hxx>
#include <V3d_PositionalLight.hxx>
#include <V3d_SpotLight.hxx>
#include <V3d_Trihedron.hxx>
#include <V3d_Viewer.hxx>
#include <UnitsAPI.hxx>

#include <tcl.h>

#include <cstdlib>

#if defined(_WIN32)
  #include <WNT_WClass.hxx>
  #include <WNT_Window.hxx>
  #include <WNT_HIDSpaceMouse.hxx>
#elif defined(HAVE_XLIB)
  #include <Xw_Window.hxx>
  #include <X11/Xlib.h>
  #include <X11/Xutil.h>
#elif defined(__APPLE__)
  #include <Cocoa_Window.hxx>
#elif defined(__EMSCRIPTEN__)
  #include <Wasm_Window.hxx>
  #include <emscripten/emscripten.h>
#else
  #include <Aspect_NeutralWindow.hxx>
#endif

//==============================================================================
//  VIEWER GLOBAL VARIABLES
//==============================================================================

Standard_IMPORT Standard_Boolean Draw_VirtualWindows;
Standard_IMPORT Standard_Boolean Draw_Interprete (const char* theCommand);

Standard_EXPORT int ViewerMainLoop(Standard_Integer , const char** argv);
extern ViewerTest_DoubleMapOfInteractiveAndName& GetMapOfAIS();

#if defined(_WIN32)
typedef WNT_Window ViewerTest_Window;
#elif defined(HAVE_XLIB)
typedef Xw_Window ViewerTest_Window;
static void VProcessEvents(ClientData,int);
#elif defined(__APPLE__)
typedef Cocoa_Window ViewerTest_Window;
extern void ViewerTest_SetCocoaEventManagerView (const Handle(Cocoa_Window)& theWindow);
extern void GetCocoaScreenResolution (Standard_Integer& theWidth, Standard_Integer& theHeight);
#elif defined(__EMSCRIPTEN__)
typedef Wasm_Window ViewerTest_Window;
#else
typedef Aspect_NeutralWindow ViewerTest_Window;
#endif

#if defined(__EMSCRIPTEN__)
//! Return DOM id of default WebGL canvas from Module.canvas.
EM_JS(char*, occJSModuleCanvasId, (), {
  const aCanvasId = Module.canvas.id;
  const aNbBytes  = lengthBytesUTF8 (aCanvasId) + 1;
  const aStrPtr   = Module._malloc (aNbBytes);
  stringToUTF8 (aCanvasId, aStrPtr, aNbBytes);
  return aStrPtr;
});

//! Return DOM id of default WebGL canvas from Module.canvas.
static TCollection_AsciiString getModuleCanvasId()
{
  char* aRawId = occJSModuleCanvasId();
  TCollection_AsciiString anId (aRawId != NULL ? aRawId : "");
  free (aRawId);
  return anId;
}
#endif

static Handle(ViewerTest_Window)& VT_GetWindow()
{
  static Handle(ViewerTest_Window) aWindow;
  return aWindow;
}

static Handle(Aspect_DisplayConnection)& GetDisplayConnection()
{
  static Handle(Aspect_DisplayConnection) aDisplayConnection;
  return aDisplayConnection;
}

static void SetDisplayConnection (const Handle(Aspect_DisplayConnection)& theDisplayConnection)
{
  GetDisplayConnection() = theDisplayConnection;
}

NCollection_DoubleMap <TCollection_AsciiString, Handle(V3d_View)> ViewerTest_myViews;
static NCollection_DoubleMap <TCollection_AsciiString, Handle(AIS_InteractiveContext)>  ViewerTest_myContexts;
static NCollection_DoubleMap <TCollection_AsciiString, Handle(Graphic3d_GraphicDriver)> ViewerTest_myDrivers;

static struct
{
  Quantity_Color FlatColor;
  Quantity_Color GradientColor1;
  Quantity_Color GradientColor2;
  Aspect_GradientFillMethod FillMethod;
} ViewerTest_DefaultBackground = { Quantity_NOC_BLACK, Quantity_NOC_BLACK, Quantity_NOC_BLACK, Aspect_GFM_NONE };

//==============================================================================
//  EVENT GLOBAL VARIABLES
//==============================================================================

Standard_Boolean TheIsAnimating = Standard_False;

namespace
{

  //! Checks if some set is a subset of other set
  //! @tparam TheSuperSet the type of the superset
  //! @tparam TheSubSet the type of the subset
  //! @param theSuperSet the superset
  //! @param theSubSet the subset to be checked
  //! @return true if the superset includes subset, or false otherwise
  template <typename TheSuperSet, typename TheSubSet>
  static bool includes (const TheSuperSet& theSuperSet, const TheSubSet& theSubSet)
  {
    return std::includes (theSuperSet.begin(), theSuperSet.end(), theSubSet.begin(), theSubSet.end());
  }

  //! A variable set of keys for command-line options.
  //! It includes a set of mandatory keys and a set of all possible keys.
  class CommandOptionKeyVariableSet
  {
  public:
    //! Default constructor
    CommandOptionKeyVariableSet()
    {
    }

    //! Constructor
    //! @param theMandatoryKeySet the set of the mandatory option keys
    //! @param theAdditionalKeySet the set of additional options that could be omitted
    CommandOptionKeyVariableSet (
      const ViewerTest_CommandOptionKeySet& theMandatoryKeySet,
      const ViewerTest_CommandOptionKeySet& theAdditionalKeySet = ViewerTest_CommandOptionKeySet())
    : myMandatoryKeySet (theMandatoryKeySet)
    {
      std::set_union (theMandatoryKeySet.begin(),
                      theMandatoryKeySet.end(),
                      theAdditionalKeySet.begin(),
                      theAdditionalKeySet.end(),
                      std::inserter (myFullKeySet, myFullKeySet.begin()));
    }

    //! Checks if the set of option keys fits to the current variable set (it must contain all mandatory keys
    //! and be contained in the full key set)
    //! @param theCheckedKeySet the set of option keys to be checked
    bool IsInSet (const ViewerTest_CommandOptionKeySet& theCheckedKeySet) const
    {
      return includes (theCheckedKeySet, myMandatoryKeySet) && includes (myFullKeySet, theCheckedKeySet);
    }

  private:
    //! A set of mandatory command-line option keys
    ViewerTest_CommandOptionKeySet myMandatoryKeySet;

    //! A full set of command-line option keys (includes mandatory and additional option keys)
    ViewerTest_CommandOptionKeySet myFullKeySet;
  };

  //! Gets some code by its name
  //! @tparam TheCode the type of a code to be found
  //! @param theCodeNameMap the map from code names to codes
  //! @param theCodeName the name of a code to be found
  //! @param theCode the code to be found
  //! @return true if a code is found, or false otherwise
  template <typename TheCode>
  static bool getSomeCodeByName (const std::map<TCollection_AsciiString, TheCode>& theCodeNameMap,
                                 TCollection_AsciiString                           theCodeName,
                                 TheCode&                                          theCode)
  {
    theCodeName.LowerCase();
    const typename std::map<TCollection_AsciiString, TheCode>::const_iterator aCodeIterator = theCodeNameMap.find (
      theCodeName);
    if (aCodeIterator == theCodeNameMap.end())
    {
      return false;
    }
    theCode = aCodeIterator->second;
    return true;
  }

  // Defines possible commands related to background changing
  enum BackgroundCommand
  {
    BackgroundCommand_Main,              //!< The main command that manages other commands through options
    BackgroundCommand_Image,             //!< Sets an image as a background
    BackgroundCommand_ImageMode,         //!< Changes a background image mode
    BackgroundCommand_Gradient,          //!< Sets a gradient as a background
    BackgroundCommand_GradientMode,      //!< Changes a background gradient mode
    BackgroundCommand_Color,             //!< Fills background with a specified color
    BackgroundCommand_Default            //!< Sets the background default color or gradient
  };

  //! Map from background command names to its codes
  typedef std::map<TCollection_AsciiString, BackgroundCommand> BackgroundCommandNameMap;

  //! Creates a map from background command names to its codes
  //! @return a map from background command names to its codes
  static BackgroundCommandNameMap createBackgroundCommandNameMap()
  {
    BackgroundCommandNameMap aBackgroundCommandNameMap;
    aBackgroundCommandNameMap["vbackground"]      = BackgroundCommand_Main;
    aBackgroundCommandNameMap["vsetbg"]           = BackgroundCommand_Image;
    aBackgroundCommandNameMap["vsetbgmode"]       = BackgroundCommand_ImageMode;
    aBackgroundCommandNameMap["vsetgradientbg"]   = BackgroundCommand_Gradient;
    aBackgroundCommandNameMap["vsetgrbgmode"]     = BackgroundCommand_GradientMode;
    aBackgroundCommandNameMap["vsetcolorbg"]      = BackgroundCommand_Color;
    aBackgroundCommandNameMap["vsetdefaultbg"]    = BackgroundCommand_Default;
    return aBackgroundCommandNameMap;
  }

  //! Gets a background command by its name
  //! @param theBackgroundCommandName the name of the background command
  //! @param theBackgroundCommand the background command to be found
  //! @return true if a background command is found, or false otherwise
  static bool getBackgroundCommandByName (const TCollection_AsciiString& theBackgroundCommandName,
                                          BackgroundCommand&             theBackgroundCommand)
  {
    static const BackgroundCommandNameMap THE_BACKGROUND_COMMAND_NAME_MAP = createBackgroundCommandNameMap();
    return getSomeCodeByName (THE_BACKGROUND_COMMAND_NAME_MAP, theBackgroundCommandName, theBackgroundCommand);
  }

  //! Map from background image fill method names to its codes
  typedef std::map<TCollection_AsciiString, Aspect_FillMethod> BackgroundImageFillMethodNameMap;

  //! Creates a map from background image fill method names to its codes
  //! @return a map from background image fill method names to its codes
  static BackgroundImageFillMethodNameMap createBackgroundImageFillMethodNameMap()
  {
    BackgroundImageFillMethodNameMap aBackgroundImageFillMethodNameMap;
    aBackgroundImageFillMethodNameMap["none"]     = Aspect_FM_NONE;
    aBackgroundImageFillMethodNameMap["centered"] = Aspect_FM_CENTERED;
    aBackgroundImageFillMethodNameMap["tiled"]    = Aspect_FM_TILED;
    aBackgroundImageFillMethodNameMap["stretch"]  = Aspect_FM_STRETCH;
    return aBackgroundImageFillMethodNameMap;
  }

  //! Gets a background image fill method by its name
  //! @param theBackgroundImageFillMethodName the name of the background image fill method
  //! @param theBackgroundImageFillMethod the background image fill method to be found
  //! @return true if a background image fill method is found, or false otherwise
  static bool getBackgroundImageFillMethodByName (const TCollection_AsciiString& theBackgroundImageFillMethodName,
                                                  Aspect_FillMethod&             theBackgroundImageFillMethod)
  {
    static const BackgroundImageFillMethodNameMap THE_BACKGROUND_IMAGE_FILL_METHOD_NAME_MAP =
      createBackgroundImageFillMethodNameMap();
    return getSomeCodeByName (THE_BACKGROUND_IMAGE_FILL_METHOD_NAME_MAP,
                              theBackgroundImageFillMethodName,
                              theBackgroundImageFillMethod);
  }

  //! Map from background gradient fill method names to its codes
  typedef std::map<TCollection_AsciiString, Aspect_GradientFillMethod> BackgroundGradientFillMethodNameMap;

  //! Creates a map from background gradient fill method names to its codes
  //! @return a map from background gradient fill method names to its codes
  static BackgroundGradientFillMethodNameMap createBackgroundGradientFillMethodNameMap()
  {
    BackgroundGradientFillMethodNameMap aBackgroundGradientFillMethodNameMap;
    aBackgroundGradientFillMethodNameMap["none"]       = Aspect_GFM_NONE;
    aBackgroundGradientFillMethodNameMap["hor"]        = Aspect_GFM_HOR;
    aBackgroundGradientFillMethodNameMap["horizontal"] = Aspect_GFM_HOR;
    aBackgroundGradientFillMethodNameMap["ver"]        = Aspect_GFM_VER;
    aBackgroundGradientFillMethodNameMap["vertical"]   = Aspect_GFM_VER;
    aBackgroundGradientFillMethodNameMap["diag1"]      = Aspect_GFM_DIAG1;
    aBackgroundGradientFillMethodNameMap["diagonal1"]  = Aspect_GFM_DIAG1;
    aBackgroundGradientFillMethodNameMap["diag2"]      = Aspect_GFM_DIAG2;
    aBackgroundGradientFillMethodNameMap["diagonal2"]  = Aspect_GFM_DIAG2;
    aBackgroundGradientFillMethodNameMap["corner1"]    = Aspect_GFM_CORNER1;
    aBackgroundGradientFillMethodNameMap["corner2"]    = Aspect_GFM_CORNER2;
    aBackgroundGradientFillMethodNameMap["corner3"]    = Aspect_GFM_CORNER3;
    aBackgroundGradientFillMethodNameMap["corner4"]    = Aspect_GFM_CORNER4;
    return aBackgroundGradientFillMethodNameMap;
  }

  //! Gets a gradient fill method by its name
  //! @param theBackgroundGradientFillMethodName the name of the gradient fill method
  //! @param theBackgroundGradientFillMethod the gradient fill method to be found
  //! @return true if a gradient fill method is found, or false otherwise
  static bool getBackgroundGradientFillMethodByName (const TCollection_AsciiString& theBackgroundGradientFillMethodName,
                                                     Aspect_GradientFillMethod&     theBackgroundGradientFillMethod)
  {
    static const BackgroundGradientFillMethodNameMap THE_BACKGROUND_GRADIENT_FILL_METHOD_NAME_MAP =
      createBackgroundGradientFillMethodNameMap();
    return getSomeCodeByName (THE_BACKGROUND_GRADIENT_FILL_METHOD_NAME_MAP,
                              theBackgroundGradientFillMethodName,
                              theBackgroundGradientFillMethod);
  }

  //! Changes the background in accordance with passed command line options
  class BackgroundChanger
  {
  public:
    //! Constructor. Prepares the command parser
    BackgroundChanger()
    {
      prepareCommandParser();
    }

    //! Processes the command line and changes the background
    //! @param theDrawInterpretor the interpreter of the Draw Harness application
    //! @param theNumberOfCommandLineArguments the number of passed command line arguments
    //! @param theCommandLineArguments the array of command line arguments
    bool ProcessCommandLine (Draw_Interpretor&        theDrawInterpretor,
                             const Standard_Integer   theNumberOfCommandLineArguments,
                             const char* const* const theCommandLineArguments)
    {
      const char* const aBackgroundCommandName = theCommandLineArguments[0];
      BackgroundCommand aBackgroundCommand = BackgroundCommand_Main;
      if (!getBackgroundCommandByName (aBackgroundCommandName, aBackgroundCommand))
      {
        return false;
      }
      addCommandDescription (aBackgroundCommand);
      myCommandParser.Parse (theNumberOfCommandLineArguments, theCommandLineArguments);
      return processCommandOptions (aBackgroundCommandName, aBackgroundCommand, theDrawInterpretor);
    }

  private:
    //! The type of functions that are able to set gradient background filling
    typedef void SetGradientFunction (const Quantity_Color& /* theColor1 */,
                                      const Quantity_Color& /* theColor2 */,
                                      const Aspect_GradientFillMethod /* theGradientMode */);

    //! The type of functions that are able to fill a background with a specific color
    typedef void SetColorFunction (const Quantity_Color& /* theColor */);

    //! the command parser used to parse command line options and its arguments
    ViewerTest_CmdParser myCommandParser;

    //! the option key for the command that sets an image as a background
    ViewerTest_CommandOptionKey myImageOptionKey;

    //! the option key for the command that sets a background image fill type
    ViewerTest_CommandOptionKey myImageModeOptionKey;

    //! the option key for the command that sets a gradient filling for the background
    ViewerTest_CommandOptionKey myGradientOptionKey;

    //! the option key for the command that sets a background gradient filling method
    ViewerTest_CommandOptionKey myGradientModeOptionKey;

    //! the option key for the command that fills background with a specific color
    ViewerTest_CommandOptionKey myColorOptionKey;

    //! the option key for the command that sets default background gradient or color
    ViewerTest_CommandOptionKey myDefaultOptionKey;

    //! the option key for the command that sets an environment cubemap as a background
    ViewerTest_CommandOptionKey myCubeMapOptionKey;

    //! the option key for the command that defines order of tiles in one image packed cubemap
    ViewerTest_CommandOptionKey myCubeMapOrderOptionKey;

    //! the option key for the command that sets inversion of Z axis for background cubemap
    ViewerTest_CommandOptionKey myCubeMapInvertedZOptionKey;

    //! the option key for the command that allows skip IBL map generation
    ViewerTest_CommandOptionKey myCubeMapDoNotGenPBREnvOptionKey;

    //! the variable set of options that are allowed for the old scenario (without any option passed)
    CommandOptionKeyVariableSet myUnnamedOptionVariableSet;

    //! the variable set of options that are allowed for setting an environment cubemap as background
    CommandOptionKeyVariableSet myCubeMapOptionVariableSet;

    //! the variable set of options that are allowed for setting an image as a background
    CommandOptionKeyVariableSet myImageOptionVariableSet;

    //! the variable set of options that are allowed for setting a background image fill type
    CommandOptionKeyVariableSet myImageModeOptionVariableSet;

    //! the variable set of options that are allowed for setting a gradient filling for the background
    CommandOptionKeyVariableSet myGradientOptionVariableSet;

    //! the variable set of options that are allowed for setting a background gradient filling method
    CommandOptionKeyVariableSet myGradientModeOptionVariableSet;

    //! the variable set of options that are allowed for filling a background with a specific color
    CommandOptionKeyVariableSet myColorOptionVariableSet;

    //! the variable set of options that are allowed for setting a default background gradient
    CommandOptionKeyVariableSet myDefaultGradientOptionVariableSet;

    //! the variable set of options that are allowed for setting a default background color
    CommandOptionKeyVariableSet myDefaultColorOptionVariableSet;

    //! the variable set of options that are allowed for printing help
    CommandOptionKeyVariableSet myHelpOptionVariableSet;

    //! Adds options to command parser
    void addOptionsToCommandParser()
    {
      myImageOptionKey     = myCommandParser.AddOption ("imageFile|image|imgFile|img",
                                                    "filename of image used as background");
      myImageModeOptionKey = myCommandParser.AddOption (
        "imageMode|imgMode", "image fill type, should be one of CENTERED, TILED, STRETCH, NONE");
      myGradientOptionKey = myCommandParser.AddOption ("gradient|grad|gr",
                                                       "sets background gradient starting and ending colors");
      myGradientModeOptionKey =
        myCommandParser.AddOption ("gradientMode|gradMode|gradMd|grMode|grMd",
                                   "gradient fill method, should be one of NONE, HOR[IZONTAL], VER[TICAL], "
                                   "DIAG[ONAL]1, DIAG[ONAL]2, CORNER1, CORNER2, CORNER3, CORNER4");
      myColorOptionKey   = myCommandParser.AddOption ("color|col", "background color");
      myDefaultOptionKey = myCommandParser.AddOption ("default|def", "sets background default gradient or color");

      myCubeMapOptionKey           = myCommandParser.AddOption ("cubemap|cmap|cm", "background cubemap");
      myCubeMapOrderOptionKey      = myCommandParser.AddOption ("order|o", "order of sides in one image packed cubemap");
      myCubeMapInvertedZOptionKey = myCommandParser.AddOption (
        "invertedz|invz|iz", "whether Z axis is inverted or not during background cubemap rendering");
      myCubeMapDoNotGenPBREnvOptionKey = myCommandParser.AddOption ("nopbrenv", "whether IBL map generation should be skipped");
    }

    //! Creates option sets used to determine if a passed option set is valid or not
    void createOptionSets()
    {
      ViewerTest_CommandOptionKeySet anUnnamedOptionSet;
      anUnnamedOptionSet.insert (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY);
      myUnnamedOptionVariableSet = CommandOptionKeyVariableSet (anUnnamedOptionSet);

      ViewerTest_CommandOptionKeySet aCubeMapOptionSet;
      aCubeMapOptionSet.insert (myCubeMapOptionKey);
      ViewerTest_CommandOptionKeySet aCubeMapAdditionalOptionKeySet;
      aCubeMapAdditionalOptionKeySet.insert (myCubeMapInvertedZOptionKey);
      aCubeMapAdditionalOptionKeySet.insert (myCubeMapDoNotGenPBREnvOptionKey);
      aCubeMapAdditionalOptionKeySet.insert (myCubeMapOrderOptionKey);
      myCubeMapOptionVariableSet     = CommandOptionKeyVariableSet (aCubeMapOptionSet, aCubeMapAdditionalOptionKeySet);

      ViewerTest_CommandOptionKeySet anImageOptionSet;
      anImageOptionSet.insert (myImageOptionKey);
      ViewerTest_CommandOptionKeySet anImageModeOptionSet;
      anImageModeOptionSet.insert (myImageModeOptionKey);
      myImageOptionVariableSet     = CommandOptionKeyVariableSet (anImageOptionSet, anImageModeOptionSet);
      myImageModeOptionVariableSet = CommandOptionKeyVariableSet (anImageModeOptionSet);

      ViewerTest_CommandOptionKeySet aGradientOptionSet;
      aGradientOptionSet.insert (myGradientOptionKey);
      ViewerTest_CommandOptionKeySet aGradientModeOptionSet;
      aGradientModeOptionSet.insert (myGradientModeOptionKey);
      myGradientOptionVariableSet     = CommandOptionKeyVariableSet (aGradientOptionSet, aGradientModeOptionSet);
      myGradientModeOptionVariableSet = CommandOptionKeyVariableSet (aGradientModeOptionSet);

      ViewerTest_CommandOptionKeySet aColorOptionSet;
      aColorOptionSet.insert (myColorOptionKey);
      myColorOptionVariableSet = CommandOptionKeyVariableSet (aColorOptionSet);

      aGradientOptionSet.insert (myDefaultOptionKey);
      myDefaultGradientOptionVariableSet = CommandOptionKeyVariableSet (aGradientOptionSet, aGradientModeOptionSet);
      aColorOptionSet.insert (myDefaultOptionKey);
      myDefaultColorOptionVariableSet = CommandOptionKeyVariableSet (aColorOptionSet);

      ViewerTest_CommandOptionKeySet aHelpOptionSet;
      aHelpOptionSet.insert (ViewerTest_CmdParser::THE_HELP_COMMAND_OPTION_KEY);
      myHelpOptionVariableSet = CommandOptionKeyVariableSet (aHelpOptionSet);
    }

    //! Prepares the command parser. Adds options and creates option sets used to determine
    //! if a passed option set is valid or not
    void prepareCommandParser()
    {
      addOptionsToCommandParser();
      createOptionSets();
    }

    //! Adds a command description to the command parser
    //! @param theBackgroundCommand the key of the command which description is added to the command parser
    void addCommandDescription (const BackgroundCommand theBackgroundCommand)
    {
      std::string aDescription;
      bool        isMainCommand = false;
      switch (theBackgroundCommand)
      {
        case BackgroundCommand_Main:
          aDescription  = "Command: vbackground (changes background or some background settings)";
          isMainCommand = true;
          break;
        case BackgroundCommand_Image:
          aDescription = "Command: vsetbg (loads image as a background)";
          break;
        case BackgroundCommand_ImageMode:
          aDescription = "Command: vsetbgmode (changes background fill type)";
          break;
        case BackgroundCommand_Gradient:
          aDescription = "Command: vsetgradientbg (mounts gradient background)";
          break;
        case BackgroundCommand_GradientMode:
          aDescription = "Command: vsetgradientbgmode (changes gradient background fill method)";
          break;
        case BackgroundCommand_Color:
          aDescription = "Command: vsetcolorbg (sets color background)";
          break;
        case BackgroundCommand_Default:
          aDescription = "Command: vsetdefaultbg (sets default viewer background gradient or fill color)";
          break;
        default:
          return;
      }
      if (!isMainCommand)
      {
        aDescription += "\nThis command is obsolete. Use vbackground instead.";
      }
      myCommandParser.SetDescription (aDescription);
    }

    //! Check if a viewer is needed to be initialized
    //! @param theBackgroundCommand the key of the command that changes the background
    //! @return true if processing was successful, or false otherwise
    bool checkViewerIsNeeded (const BackgroundCommand theBackgroundCommand) const
    {
      const bool                           isMain             = (theBackgroundCommand == BackgroundCommand_Main);
      const ViewerTest_CommandOptionKeySet aUsedOptions       = myCommandParser.GetUsedOptions();
      const bool                           aViewerIsNotNeeded =
        (theBackgroundCommand == BackgroundCommand_Default)
        || (myDefaultGradientOptionVariableSet.IsInSet (aUsedOptions) && isMain)
        || (myDefaultColorOptionVariableSet.IsInSet (aUsedOptions) && isMain)
        || myHelpOptionVariableSet.IsInSet (aUsedOptions);
      return !aViewerIsNotNeeded;
    }

    //! Check if a viewer is initialized
    //! @param theBackgroundCommandName the name of the command that changes the background
    //! @param theDrawInterpretor the interpreter of the Draw Harness application
    //! @return true if a viewer is initialized, or false otherwise
    static bool checkViewerIsInitialized (const char* const theBackgroundCommandName,
                                          Draw_Interpretor& theDrawInterpretor)
    {
      const Handle (AIS_InteractiveContext)& anAISContext = ViewerTest::GetAISContext();
      if (anAISContext.IsNull())
      {
        theDrawInterpretor << "Use 'vinit' command before executing '" << theBackgroundCommandName << "' command.\n";
        return false;
      }
      return true;
    }

    //! Processes command options
    //! @param theBackgroundCommandName the name of the command that changes the background
    //! @param theBackgroundCommand the key of the command that changes the background
    //! @param theDrawInterpretor the interpreter of the Draw Harness application
    //! @return true if processing was successful, or false otherwise
    bool processCommandOptions (const char* const       theBackgroundCommandName,
                                const BackgroundCommand theBackgroundCommand,
                                Draw_Interpretor&       theDrawInterpretor) const
    {
      if (myCommandParser.HasNoOption())
      {
        return printHelp (theBackgroundCommandName, theDrawInterpretor);
      }
      if (checkViewerIsNeeded (theBackgroundCommand)
          && !checkViewerIsInitialized (theBackgroundCommandName, theDrawInterpretor))
      {
        return false;
      }
      if (myCommandParser.HasOnlyUnnamedOption())
      {
        return processUnnamedOption (theBackgroundCommand);
      }
      return processNamedOptions (theBackgroundCommandName, theBackgroundCommand, theDrawInterpretor);
    }

    //! Processes the unnamed option
    //! @param theBackgroundCommand the key of the command that changes the background
    //! @return true if processing was successful, or false otherwise
    bool processUnnamedOption (const BackgroundCommand theBackgroundCommand) const
    {
      switch (theBackgroundCommand)
      {
        case BackgroundCommand_Main:
          return false;
        case BackgroundCommand_Image:
          return processImageUnnamedOption();
        case BackgroundCommand_ImageMode:
          return processImageModeUnnamedOption();
        case BackgroundCommand_Gradient:
          return processGradientUnnamedOption();
        case BackgroundCommand_GradientMode:
          return processGradientModeUnnamedOption();
        case BackgroundCommand_Color:
          return processColorUnnamedOption();
        case BackgroundCommand_Default:
          return processDefaultUnnamedOption();
        default:
          return false;
      }
    }

    //! Processes the image unnamed option
    //! @return true if processing was successful, or false otherwise
    bool processImageUnnamedOption() const
    {
      const std::size_t aNumberOfImageUnnamedOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY);
      if ((aNumberOfImageUnnamedOptionArguments != 1) && (aNumberOfImageUnnamedOptionArguments != 2))
      {
        return false;
      }
      std::string anImageFileName;
      if (!myCommandParser.Arg (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY, 0, anImageFileName))
      {
        return false;
      }
      Aspect_FillMethod anImageMode = Aspect_FM_CENTERED;
      if (aNumberOfImageUnnamedOptionArguments == 2)
      {
        std::string anImageModeString;
        if (!myCommandParser.Arg (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY, 1, anImageModeString))
        {
          return false;
        }
        if (!getBackgroundImageFillMethodByName (anImageModeString.c_str(), anImageMode))
        {
          return false;
        }
      }
      setImage (anImageFileName.c_str(), anImageMode);
      return true;
    }

    //! Processes the image mode unnamed option
    //! @return true if processing was successful, or false otherwise
    bool processImageModeUnnamedOption() const
    {
      return processImageModeOptionSet (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY);
    }

    //! Processes the gradient unnamed option
    //! @param theSetGradient the function used to set a background gradient filling
    //! @return true if processing was successful, or false otherwise
    bool processGradientUnnamedOption (SetGradientFunction* const theSetGradient = setGradient) const
    {
      const Standard_Integer aNumberOfGradientUnnamedOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY);
      if (aNumberOfGradientUnnamedOptionArguments < 2)
      {
        return false;
      }

      Standard_Integer anArgumentIndex = 0;
      Quantity_Color   aColor1;
      if (!myCommandParser.ArgColor (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY, anArgumentIndex, aColor1))
      {
        return false;
      }
      if (anArgumentIndex >= aNumberOfGradientUnnamedOptionArguments)
      {
        return false;
      }

      Quantity_Color aColor2;
      if (!myCommandParser.ArgColor (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY, anArgumentIndex, aColor2))
      {
        return false;
      }
      if (anArgumentIndex > aNumberOfGradientUnnamedOptionArguments)
      {
        return false;
      }

      Aspect_GradientFillMethod aGradientMode = Aspect_GFM_HOR;
      if (anArgumentIndex == aNumberOfGradientUnnamedOptionArguments - 1)
      {
        std::string anGradientModeString;

        if (!myCommandParser.Arg (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY,
                                  anArgumentIndex,
                                  anGradientModeString))
        {
          return false;
        }
        if (!getBackgroundGradientFillMethodByName (anGradientModeString.c_str(), aGradientMode))
        {
          return false;
        }
        ++anArgumentIndex;
      }
      if (anArgumentIndex != aNumberOfGradientUnnamedOptionArguments)
      {
        return false;
      }
      theSetGradient (aColor1, aColor2, aGradientMode);
      return true;
    }

    //! Processes the gradient mode unnamed option
    //! @return true if processing was successful, or false otherwise
    bool processGradientModeUnnamedOption() const
    {
      return processGradientModeOptionSet (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY);
    }

    //! Processes the color unnamed option
    //! @param theSetColor the function used to set a background color
    //! @return true if processing was successful, or false otherwise
    bool processColorUnnamedOption (SetColorFunction* const theSetColor = setColor) const
    {
      return processColorOptionSet (ViewerTest_CmdParser::THE_UNNAMED_COMMAND_OPTION_KEY, theSetColor);
    }

    //! Processes the default back unnamed option
    //! @return true if processing was successful, or false otherwise
    bool processDefaultUnnamedOption() const
    {
      if (processGradientUnnamedOption (setDefaultGradient))
      {
        return true;
      }
      return processColorUnnamedOption (setDefaultColor);
    }

    //! Processes named options
    //! @param theBackgroundCommandName the name of the command that changes the background
    //! @param theBackgroundCommand the key of the command that changes the background
    //! @param theDrawInterpretor the interpreter of the Draw Harness application
    //! @return true if processing was successful, or false otherwise
    bool processNamedOptions (const char* const       theBackgroundCommandName,
                              const BackgroundCommand theBackgroundCommand,
                              Draw_Interpretor&       theDrawInterpretor) const
    {
      const bool                           isMain       = (theBackgroundCommand == BackgroundCommand_Main);
      const ViewerTest_CommandOptionKeySet aUsedOptions = myCommandParser.GetUsedOptions();
      if (myCubeMapOptionVariableSet.IsInSet (aUsedOptions) && isMain)
      {
        return processCubeMapOptionSet();
      }
      if (myImageOptionVariableSet.IsInSet (aUsedOptions)
          && (isMain || (theBackgroundCommand == BackgroundCommand_Image)))
      {
        return processImageOptionSet();
      }
      if (myImageModeOptionVariableSet.IsInSet (aUsedOptions)
          && (isMain || (theBackgroundCommand == BackgroundCommand_ImageMode)))
      {
        return processImageModeOptionSet();
      }
      if (myGradientOptionVariableSet.IsInSet (aUsedOptions)
          && (isMain || (theBackgroundCommand == BackgroundCommand_Gradient)))
      {
        return processGradientOptionSet();
      }
      if (myGradientModeOptionVariableSet.IsInSet (aUsedOptions)
          && (isMain || (theBackgroundCommand == BackgroundCommand_GradientMode)))
      {
        return processGradientModeOptionSet();
      }
      if (myColorOptionVariableSet.IsInSet (aUsedOptions)
          && (isMain || (theBackgroundCommand == BackgroundCommand_Color)))
      {
        return processColorOptionSet();
      }
      if ((myDefaultGradientOptionVariableSet.IsInSet (aUsedOptions) && isMain)
          || (myGradientOptionVariableSet.IsInSet (aUsedOptions)
              && (theBackgroundCommand == BackgroundCommand_Default)))
      {
        return processDefaultGradientOptionSet();
      }
      if ((myDefaultColorOptionVariableSet.IsInSet (aUsedOptions) && isMain)
          || (myColorOptionVariableSet.IsInSet (aUsedOptions) && (theBackgroundCommand == BackgroundCommand_Default)))
      {
        return processDefaultColorOptionSet();
      }
      if (myHelpOptionVariableSet.IsInSet (aUsedOptions))
      {
        return processHelpOptionSet (theBackgroundCommandName, theDrawInterpretor);
      }
      return false;
    }

    //! Process the cubemap option set in named and unnamed case.
    //! @return true if processing was successful, or false otherwise
    bool processCubeMapOptionSet() const
    {
      NCollection_Array1<TCollection_AsciiString> aFilePaths;

      if (!processCubeMapOptions (aFilePaths))
      {
        return false;
      }

      Graphic3d_CubeMapOrder anOrder = Graphic3d_CubeMapOrder::Default();

      if (myCommandParser.HasOption (myCubeMapOrderOptionKey))
      {
        if (!processCubeMapOrderOptions (anOrder))
        {
          return false;
        }
      }

      bool aZIsInverted = false;
      if (myCommandParser.HasOption (myCubeMapInvertedZOptionKey))
      {
        if (!processCubeMapInvertedZOptionSet())
        {
          return false;
        }
        aZIsInverted = true;
      }

      bool aToGenPBREnv = true;
      if (myCommandParser.HasOption (myCubeMapDoNotGenPBREnvOptionKey))
      {
        if (!processCubeMapDoNotGenPBREnvOptionSet())
        {
          return false;
        }
        aToGenPBREnv = false;
      }

      setCubeMap (aFilePaths, anOrder.Validated(), aZIsInverted, aToGenPBREnv);
      return true;
    }

    //! Processes the image option set
    //! @return true if processing was successful, or false otherwise
    bool processImageOptionSet() const
    {
      std::string anImageFileName;
      if (!processImageOption (anImageFileName))
      {
        return false;
      }
      Aspect_FillMethod anImageMode = Aspect_FM_CENTERED;
      if (myCommandParser.HasOption (myImageModeOptionKey) && !processImageModeOption (anImageMode))
      {
        return false;
      }
      setImage (anImageFileName.c_str(), anImageMode);
      return true;
    }

    //! Processes the image mode option set
    //! @return true if processing was successful, or false otherwise
    bool processImageModeOptionSet() const
    {
      return processImageModeOptionSet (myImageModeOptionKey);
    }

    //! Processes the image mode option set
    //! @param theImageModeOptionKey the key of the option that is interpreted as an image mode option
    //! @return true if processing was successful, or false otherwise
    bool processImageModeOptionSet (const ViewerTest_CommandOptionKey theImageModeOptionKey) const
    {
      Aspect_FillMethod anImageMode = Aspect_FM_NONE;
      if (!processImageModeOption (theImageModeOptionKey, anImageMode))
      {
        return false;
      }
      setImageMode (anImageMode);
      return true;
    }

    //! Processes the gradient option set
    //! @param theSetGradient the function used to set a background gradient filling
    //! @return true if processing was successful, or false otherwise
    bool processGradientOptionSet (SetGradientFunction* const theSetGradient = setGradient) const
    {
      Quantity_Color aColor1;
      Quantity_Color aColor2;
      if (!processGradientOption (aColor1, aColor2))
      {
        return false;
      }
      Aspect_GradientFillMethod aGradientMode = Aspect_GFM_HOR;
      if (myCommandParser.HasOption (myGradientModeOptionKey) && !processGradientModeOption (aGradientMode))
      {
        return false;
      }
      theSetGradient (aColor1, aColor2, aGradientMode);
      return true;
    }

    //! Processes the gradient mode option set
    //! @return true if processing was successful, or false otherwise
    bool processGradientModeOptionSet() const
    {
      return processGradientModeOptionSet (myGradientModeOptionKey);
    }

    //! Processes the gradient mode option set
    //! @param theGradientModeOptionKey the key of the option that is interpreted as a gradient mode option
    //! @return true if processing was successful, or false otherwise
    bool processGradientModeOptionSet (const ViewerTest_CommandOptionKey theGradientModeOptionKey) const
    {
      Aspect_GradientFillMethod aGradientMode = Aspect_GFM_NONE;
      if (!processGradientModeOption (theGradientModeOptionKey, aGradientMode))
      {
        return false;
      }
      setGradientMode (aGradientMode);
      return true;
    }

    //! Processes the color option set
    //! @param theSetColor the function used to set a background color
    //! @return true if processing was successful, or false otherwise
    bool processColorOptionSet (SetColorFunction* const theSetColor = setColor) const
    {
      return processColorOptionSet (myColorOptionKey, theSetColor);
    }

    //! Processes the default color option set
    //! @return true if processing was successful, or false otherwise
    bool processDefaultGradientOptionSet() const
    {
      return processGradientOptionSet (setDefaultGradient);
    }

    //! Processes the default gradient option set
    //! @return true if processing was successful, or false otherwise
    bool processDefaultColorOptionSet() const
    {
      return processColorOptionSet (setDefaultColor);
    }

    //! Processes the color option set
    //! @param theColorOptionKey the key of the option that is interpreted as a color option
    //! @param theSetColor the function used to set a background color
    //! @return true if processing was successful, or false otherwise
    bool processColorOptionSet (const ViewerTest_CommandOptionKey theColorOptionKey,
                                SetColorFunction* const           theSetColor = setColor) const
    {
      Quantity_Color aColor;
      if (!processColorOption (theColorOptionKey, aColor))
      {
        return false;
      }
      theSetColor (aColor);
      return true;
    }

    //! Processes the help option set
    //! @param theBackgroundCommandName the name of the command that changes the background
    //! @param theDrawInterpretor the interpreter of the Draw Harness application
    //! @return true if processing was successful, or false otherwise
    bool processHelpOptionSet (const char* const theBackgroundCommandName, Draw_Interpretor& theDrawInterpretor) const
    {
      const Standard_Integer aNumberOfHelpOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        ViewerTest_CmdParser::THE_HELP_COMMAND_OPTION_KEY);
      if (aNumberOfHelpOptionArguments != 0)
      {
        return false;
      }
      return printHelp (theBackgroundCommandName, theDrawInterpretor);
    }

    //! Processes the cubemap option
    //! @param theFilePaths the array of filenames of cubemap sides
    //! @return true if processing was successful, or false otherwise
    bool processCubeMapOptions (NCollection_Array1<TCollection_AsciiString> &theFilePaths) const
    {
      const Standard_Integer aNumberOfCubeMapOptionArguments = myCommandParser.GetNumberOfOptionArguments (myCubeMapOptionKey);

      if (aNumberOfCubeMapOptionArguments != 1
       && aNumberOfCubeMapOptionArguments != 6)
      {
        return false;
      }

      theFilePaths.Resize(0, aNumberOfCubeMapOptionArguments - 1, Standard_False);

      for (int i = 0; i < aNumberOfCubeMapOptionArguments; ++i)
      {
        std::string aCubeMapFileName;
        if (!myCommandParser.Arg (myCubeMapOptionKey, i, aCubeMapFileName))
        {
          return false;
        }
        theFilePaths[i] = aCubeMapFileName.c_str();
      }

      return true;
    }

    //! Processes the inverted z cubemap option
    //! @return true if processing was successful, or false otherwise
    bool processCubeMapInvertedZOptionSet () const
    {
      const Standard_Integer aNumberOfCubeMapZInversionOptionArguments =
        myCommandParser.GetNumberOfOptionArguments (myCubeMapInvertedZOptionKey);

      if (aNumberOfCubeMapZInversionOptionArguments != 0)
      {
        return false;
      }

      return true;
    }

    //! Processes the option allowing to skip IBM maps generation
    //! @return true if processing was successful, or false otherwise
    bool processCubeMapDoNotGenPBREnvOptionSet() const
    {
      const Standard_Integer aNumberOfCubeMapDoNotGenPBREnvOptionArguments =
        myCommandParser.GetNumberOfOptionArguments(myCubeMapDoNotGenPBREnvOptionKey);

      if (aNumberOfCubeMapDoNotGenPBREnvOptionArguments != 0)
      {
        return false;
      }

      return true;
    }

    //! Processes the tiles order option
    //! @param theOrder the array of indexes if cubemap sides in tile grid
    //! @return true if processing was successful, or false otherwise
    bool processCubeMapOrderOptions (Graphic3d_CubeMapOrder& theOrder) const
    {
      const Standard_Integer aNumberOfCubeMapOrderOptionArguments = myCommandParser.GetNumberOfOptionArguments(
        myCubeMapOrderOptionKey);

      if (aNumberOfCubeMapOrderOptionArguments != 6)
      {
        return false;
      }


      for (unsigned int i = 0; i < 6; ++i)
      {
        std::string anOrderItem;
        if (!myCommandParser.Arg (myCubeMapOrderOptionKey, i, anOrderItem)) 
        {
          return false;
        }

        theOrder.Set (Graphic3d_CubeMapSide (i),
                      static_cast<unsigned char> (Draw::Atoi (anOrderItem.c_str())));
      }

      return theOrder.IsValid();
    }

    //! Processes the image option
    //! @param theImageFileName the filename of the image to be used as a background
    //! @return true if processing was successful, or false otherwise
    bool processImageOption (std::string& theImageFileName) const
    {
      const Standard_Integer aNumberOfImageOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        myImageOptionKey);
      if (aNumberOfImageOptionArguments != 1)
      {
        return false;
      }
      std::string anImageFileName;
      if (!myCommandParser.Arg (myImageOptionKey, 0, anImageFileName))
      {
        return false;
      }
      theImageFileName = anImageFileName;
      return true;
    }

    //! Processes the image mode option
    //! @param theImageMode the fill type used for a background image
    //! @return true if processing was successful, or false otherwise
    bool processImageModeOption (Aspect_FillMethod& theImageMode) const
    {
      return processImageModeOption (myImageModeOptionKey, theImageMode);
    }

    //! Processes the image mode option
    //! @param theImageModeOptionKey the key of the option that is interpreted as an image mode option
    //! @param theImageMode the fill type used for a background image
    //! @return true if processing was successful, or false otherwise
    bool processImageModeOption (const ViewerTest_CommandOptionKey theImageModeOptionKey,
                                 Aspect_FillMethod&                theImageMode) const
    {
      return processModeOption (theImageModeOptionKey, getBackgroundImageFillMethodByName, theImageMode);
    }

    //! Processes the gradient option
    //! @param theColor1 the gradient starting color
    //! @param theColor2 the gradient ending color
    //! @return true if processing was successful, or false otherwise
    bool processGradientOption (Quantity_Color& theColor1, Quantity_Color& theColor2) const
    {
      Standard_Integer anArgumentIndex = 0;
      Quantity_Color   aColor1;
      if (!myCommandParser.ArgColor (myGradientOptionKey, anArgumentIndex, aColor1))
      {
        return false;
      }
      Quantity_Color aColor2;
      if (!myCommandParser.ArgColor (myGradientOptionKey, anArgumentIndex, aColor2))
      {
        return false;
      }
      const Standard_Integer aNumberOfGradientOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        myGradientOptionKey);
      if (anArgumentIndex != aNumberOfGradientOptionArguments)
      {
        return false;
      }
      theColor1 = aColor1;
      theColor2 = aColor2;
      return true;
    }

    //! Processes the gradient mode option
    //! @param theGradientMode the fill method used for a background gradient filling
    //! @return true if processing was successful, or false otherwise
    bool processGradientModeOption (Aspect_GradientFillMethod& theGradientMode) const
    {
      return processGradientModeOption (myGradientModeOptionKey, theGradientMode);
    }

    //! Processes the gradient mode option
    //! @param theGradientModeOptionKey the key of the option that is interpreted as a gradient mode option
    //! @param theGradientMode the fill method used for a background gradient filling
    //! @return true if processing was successful, or false otherwise
    bool processGradientModeOption (const ViewerTest_CommandOptionKey theGradientModeOptionKey,
                                    Aspect_GradientFillMethod&        theGradientMode) const
    {
      return processModeOption (theGradientModeOptionKey, getBackgroundGradientFillMethodByName, theGradientMode);
    }

    //! Processes some mode option
    //! @tparam TheMode the type of a mode to be processed
    //! @param theModeOptionKey the key of the option that is interpreted as a mode option
    //! @param theMode a mode to be processed
    //! @return true if processing was successful, or false otherwise
    template <typename TheMode>
    bool processModeOption (const ViewerTest_CommandOptionKey theModeOptionKey,
                            bool (*const theGetModeByName) (const TCollection_AsciiString& /* theModeName */,
                                                            TheMode& /* theMode */),
                            TheMode& theMode) const
    {
      const Standard_Integer aNumberOfModeOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        theModeOptionKey);
      if (aNumberOfModeOptionArguments != 1)
      {
        return false;
      }
      std::string aModeString;
      if (!myCommandParser.Arg (theModeOptionKey, 0, aModeString))
      {
        return false;
      }
      TheMode aMode = TheMode();
      if (!theGetModeByName (aModeString.c_str(), aMode))
      {
        return false;
      }
      theMode = aMode;
      return true;
    }

    //! Processes the color option
    //! @param theColor a color used for filling a background
    //! @return true if processing was successful, or false otherwise
    bool processColorOption (Quantity_Color& theColor) const
    {
      return processColorOption (myColorOptionKey, theColor);
    }

    //! Processes the color option
    //! @param theColorOptionKey the key of the option that is interpreted as a color option
    //! @param theColor a color used for filling a background
    //! @return true if processing was successful, or false otherwise
    bool processColorOption (const ViewerTest_CommandOptionKey theColorOptionKey, Quantity_Color& theColor) const
    {
      Standard_Integer anArgumentIndex = 0;
      Quantity_Color   aColor;
      if (!myCommandParser.ArgColor (theColorOptionKey, anArgumentIndex, aColor))
      {
        return false;
      }
      const Standard_Integer aNumberOfColorOptionArguments = myCommandParser.GetNumberOfOptionArguments (
        theColorOptionKey);
      if (anArgumentIndex != aNumberOfColorOptionArguments)
      {
        return false;
      }
      theColor = aColor;
      return true;
    }

    //! Prints helping message
    //! @param theBackgroundCommandName the name of the command that changes the background
    //! @param theDrawInterpretor the interpreter of the Draw Harness application
    //! @return true if printing was successful, or false otherwise
    static bool printHelp (const char* const theBackgroundCommandName, Draw_Interpretor& theDrawInterpretor)
    {
      return theDrawInterpretor.PrintHelp (theBackgroundCommandName) == TCL_OK;
    }

    //! Sets the cubemap as a background
    //! @param theFileNames the array of filenames of packed or multifile cubemap
    //! @param theOrder array of cubemap sides indexes mapping them from tiles in packed cubemap
    static void setCubeMap (const NCollection_Array1<TCollection_AsciiString>& theFileNames,
                            const Graphic3d_ValidatedCubeMapOrder              theOrder = Graphic3d_CubeMapOrder::Default(),
                            bool                                               theZIsInverted = false,
                            bool                                               theToGenPBREnv = true)
    {
      const Handle(V3d_View)& aCurrentView = ViewerTest::CurrentView();
      Handle(Graphic3d_CubeMap) aCubeMap;

      if (theFileNames.Size() == 1)
        aCubeMap = new Graphic3d_CubeMapPacked(theFileNames[0], theOrder);
      else
        aCubeMap = new Graphic3d_CubeMapSeparate(theFileNames);

      aCubeMap->SetZInversion (theZIsInverted);

      aCubeMap->GetParams()->SetFilter(Graphic3d_TOTF_BILINEAR);
      aCubeMap->GetParams()->SetRepeat(Standard_False);
      aCubeMap->GetParams()->SetTextureUnit(Graphic3d_TextureUnit_EnvMap);

      aCurrentView->SetBackgroundCubeMap (aCubeMap, theToGenPBREnv, Standard_True);
    }

    //! Sets the image as a background
    //! @param theImageFileName the filename of the image to be used as a background
    //! @param theImageMode the fill type used for a background image
    static void setImage (const Standard_CString theImageFileName, const Aspect_FillMethod theImageMode)
    {
      const Handle (V3d_View)& aCurrentView = ViewerTest::CurrentView();
      aCurrentView->SetBackgroundImage (theImageFileName, theImageMode, Standard_True);
    }

    //! Sets the fill type used for a background image
    //! @param theImageMode the fill type used for a background image
    static void setImageMode (const Aspect_FillMethod theImageMode)
    {
      const Handle (V3d_View)& aCurrentView = ViewerTest::CurrentView();
      aCurrentView->SetBgImageStyle (theImageMode, Standard_True);
    }

    //! Sets the gradient filling for a background
    //! @param theColor1 the gradient starting color
    //! @param theColor2 the gradient ending color
    //! @param theGradientMode the fill method used for a background gradient filling
    static void setGradient (const Quantity_Color&           theColor1,
                             const Quantity_Color&           theColor2,
                             const Aspect_GradientFillMethod theGradientMode)
    {
      const Handle (V3d_View)& aCurrentView = ViewerTest::CurrentView();
      aCurrentView->SetBgGradientColors (theColor1, theColor2, theGradientMode, Standard_True);
    }

    //! Sets the fill method used for a background gradient filling
    //! @param theGradientMode the fill method used for a background gradient filling
    static void setGradientMode (const Aspect_GradientFillMethod theGradientMode)
    {
      const Handle (V3d_View)& aCurrentView = ViewerTest::CurrentView();
      aCurrentView->SetBgGradientStyle (theGradientMode, Standard_True);
    }

    //! Sets the color used for filling a background
    //! @param theColor the color used for filling a background
    static void setColor (const Quantity_Color& theColor)
    {
      const Handle (V3d_View)& aCurrentView = ViewerTest::CurrentView();
      aCurrentView->SetBgGradientStyle (Aspect_GFM_NONE);
      aCurrentView->SetBackgroundColor (theColor);
      aCurrentView->Update();
    }

    //! Sets the gradient filling for a background in a default viewer
    //! @param theColor1 the gradient starting color
    //! @param theColor2 the gradient ending color
    //! @param theGradientMode the fill method used for a background gradient filling
    static void setDefaultGradient (const Quantity_Color&           theColor1,
                                    const Quantity_Color&           theColor2,
                                    const Aspect_GradientFillMethod theGradientMode)
    {
      ViewerTest_DefaultBackground.GradientColor1 = theColor1;
      ViewerTest_DefaultBackground.GradientColor2 = theColor2;
      ViewerTest_DefaultBackground.FillMethod     = theGradientMode;
      setDefaultGradient();
    }

    //! Sets the color used for filling a background in a default viewer
    //! @param theColor the color used for filling a background
    static void setDefaultColor (const Quantity_Color& theColor)
    {
      ViewerTest_DefaultBackground.GradientColor1 = Quantity_Color();
      ViewerTest_DefaultBackground.GradientColor2 = Quantity_Color();
      ViewerTest_DefaultBackground.FillMethod     = Aspect_GFM_NONE;
      ViewerTest_DefaultBackground.FlatColor      = theColor;
      setDefaultGradient();
      setDefaultColor();
    }

    //! Sets the gradient filling for a background in a default viewer.
    //! Gradient settings are taken from ViewerTest_DefaultBackground structure
    static void setDefaultGradient()
    {
      for (NCollection_DoubleMap<TCollection_AsciiString, Handle (AIS_InteractiveContext)>::Iterator
             anInteractiveContextIterator (ViewerTest_myContexts);
           anInteractiveContextIterator.More();
           anInteractiveContextIterator.Next())
      {
        const Handle (V3d_Viewer)& aViewer = anInteractiveContextIterator.Value()->CurrentViewer();
        aViewer->SetDefaultBgGradientColors (ViewerTest_DefaultBackground.GradientColor1,
                                             ViewerTest_DefaultBackground.GradientColor2,
                                             ViewerTest_DefaultBackground.FillMethod);
      }
    }

    //! Sets the color used for filling a background in a default viewer.
    //! The color value is taken from ViewerTest_DefaultBackground structure
    static void setDefaultColor()
    {
      for (NCollection_DoubleMap<TCollection_AsciiString, Handle (AIS_InteractiveContext)>::Iterator
             anInteractiveContextIterator (ViewerTest_myContexts);
           anInteractiveContextIterator.More();
           anInteractiveContextIterator.Next())
      {
        const Handle (V3d_Viewer)& aViewer = anInteractiveContextIterator.Value()->CurrentViewer();
        aViewer->SetDefaultBackgroundColor (ViewerTest_DefaultBackground.FlatColor);
      }
    }
  };

} // namespace

//==============================================================================

#ifdef _WIN32
static LRESULT WINAPI AdvViewerWindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
#endif

//==============================================================================
//function : WClass
//purpose  :
//==============================================================================

const Handle(WNT_WClass)& ViewerTest::WClass()
{
  static Handle(WNT_WClass) theWClass;
#if defined(_WIN32)
  if (theWClass.IsNull())
  {
    theWClass = new WNT_WClass ("GW3D_Class", (Standard_Address )AdvViewerWindowProc,
                                CS_VREDRAW | CS_HREDRAW, 0, 0,
                                ::LoadCursor (NULL, IDC_ARROW));
  }
#endif
  return theWClass;
}

//==============================================================================
//function : CreateName
//purpose  : Create numerical name for new object in theMap
//==============================================================================
template <typename ObjectType>
TCollection_AsciiString CreateName (const NCollection_DoubleMap <TCollection_AsciiString, ObjectType>& theObjectMap,
                                    const TCollection_AsciiString& theDefaultString)
{
  if (theObjectMap.IsEmpty())
    return theDefaultString + TCollection_AsciiString(1);

  Standard_Integer aNextKey = 1;
  Standard_Boolean isFound = Standard_False;
  while (!isFound)
  {
    TCollection_AsciiString aStringKey = theDefaultString + TCollection_AsciiString(aNextKey);
    // Look for objects with default names
    if (theObjectMap.IsBound1(aStringKey))
    {
      aNextKey++;
    }
    else
      isFound = Standard_True;
  }

  return theDefaultString + TCollection_AsciiString(aNextKey);
}

//==============================================================================
//structure : ViewerTest_Names
//purpose   : Allow to operate with full view name: driverName/viewerName/viewName
//==============================================================================
struct ViewerTest_Names
{
private:
  TCollection_AsciiString myDriverName;
  TCollection_AsciiString myViewerName;
  TCollection_AsciiString myViewName;

public:

  const TCollection_AsciiString& GetDriverName () const
  {
    return myDriverName;
  }
  void SetDriverName (const TCollection_AsciiString& theDriverName)
  {
    myDriverName = theDriverName;
  }
  const TCollection_AsciiString& GetViewerName () const
  {
    return myViewerName;
  }
  void SetViewerName (const TCollection_AsciiString& theViewerName)
  {
    myViewerName = theViewerName;
  }
  const TCollection_AsciiString& GetViewName () const
  {
    return myViewName;
  }
  void SetViewName (const TCollection_AsciiString& theViewName)
  {
    myViewName = theViewName;
  }

  //===========================================================================
  //function : Constructor for ViewerTest_Names
  //purpose  : Get view, viewer, driver names from custom string
  //===========================================================================

  ViewerTest_Names (const TCollection_AsciiString& theInputString)
  {
    TCollection_AsciiString aName(theInputString);
    if (theInputString.IsEmpty())
    {
      // Get current configuration
      if (ViewerTest_myDrivers.IsEmpty())
        myDriverName = CreateName<Handle(Graphic3d_GraphicDriver)>
          (ViewerTest_myDrivers, TCollection_AsciiString("Driver"));
      else
        myDriverName = ViewerTest_myDrivers.Find2
        (ViewerTest::GetAISContext()->CurrentViewer()->Driver());

      if(ViewerTest_myContexts.IsEmpty())
      {
        myViewerName = CreateName <Handle(AIS_InteractiveContext)>
          (ViewerTest_myContexts, TCollection_AsciiString (myDriverName + "/Viewer"));
      }
      else
      {
        myViewerName = ViewerTest_myContexts.Find2 (ViewerTest::GetAISContext());
      }

      myViewName = CreateName <Handle(V3d_View)> (ViewerTest_myViews, TCollection_AsciiString(myViewerName + "/View"));
    }
    else
    {
      // There is at least view name
      Standard_Integer aParserNumber = 0;
      for (Standard_Integer i = 0; i < 3; ++i)
      {
        Standard_Integer aParserPos = aName.SearchFromEnd("/");
        if(aParserPos != -1)
        {
          aParserNumber++;
          aName.Split(aParserPos-1);
        }
        else
          break;
      }
      if (aParserNumber == 0)
      {
        // Only view name
        if (!ViewerTest::GetAISContext().IsNull())
        {
          myDriverName = ViewerTest_myDrivers.Find2
          (ViewerTest::GetAISContext()->CurrentViewer()->Driver());
          myViewerName = ViewerTest_myContexts.Find2
          (ViewerTest::GetAISContext());
        }
        else
        {
          // There is no opened contexts here, need to create names for viewer and driver
          myDriverName = CreateName<Handle(Graphic3d_GraphicDriver)>
            (ViewerTest_myDrivers, TCollection_AsciiString("Driver"));

          myViewerName = CreateName <Handle(AIS_InteractiveContext)>
            (ViewerTest_myContexts, TCollection_AsciiString (myDriverName + "/Viewer"));
        }
        myViewName = TCollection_AsciiString(myViewerName + "/" + theInputString);
      }
      else if (aParserNumber == 1)
      {
        // Here is viewerName/viewName
        if (!ViewerTest::GetAISContext().IsNull())
          myDriverName = ViewerTest_myDrivers.Find2
          (ViewerTest::GetAISContext()->CurrentViewer()->Driver());
        else
        {
          // There is no opened contexts here, need to create name for driver
          myDriverName = CreateName<Handle(Graphic3d_GraphicDriver)>
            (ViewerTest_myDrivers, TCollection_AsciiString("Driver"));
        }
        myViewerName = TCollection_AsciiString(myDriverName + "/" + aName);

        myViewName = TCollection_AsciiString(myDriverName + "/" + theInputString);
      }
      else
      {
        //Here is driverName/viewerName/viewName
        myDriverName = TCollection_AsciiString(aName);

        TCollection_AsciiString aViewerName(theInputString);
        aViewerName.Split(aViewerName.SearchFromEnd("/") - 1);
        myViewerName = TCollection_AsciiString(aViewerName);

        myViewName = TCollection_AsciiString(theInputString);
      }
    }
  }
};

//==============================================================================
//function : FindContextByView
//purpose  : Find AIS_InteractiveContext by View
//==============================================================================

Handle(AIS_InteractiveContext) FindContextByView (const Handle(V3d_View)& theView)
{
  Handle(AIS_InteractiveContext) anAISContext;

  for (NCollection_DoubleMap<TCollection_AsciiString, Handle(AIS_InteractiveContext)>::Iterator
       anIter (ViewerTest_myContexts); anIter.More(); anIter.Next())
  {
    if (anIter.Value()->CurrentViewer() == theView->Viewer())
       return anIter.Key2();
  }
  return anAISContext;
}

//==============================================================================
//function : IsWindowOverlapped
//purpose  : Check if theWindow overlapp another view
//==============================================================================

Standard_Boolean IsWindowOverlapped (const Standard_Integer thePxLeft,
                                     const Standard_Integer thePxTop,
                                     const Standard_Integer thePxRight,
                                     const Standard_Integer thePxBottom,
                                     TCollection_AsciiString& theViewId)
{
  for(NCollection_DoubleMap <TCollection_AsciiString, Handle(V3d_View)>::Iterator
      anIter(ViewerTest_myViews); anIter.More(); anIter.Next())
  {
    Standard_Integer aTop = 0,
      aLeft = 0,
      aRight = 0,
      aBottom = 0;
    anIter.Value()->Window()->Position(aLeft, aTop, aRight, aBottom);
    if ((thePxLeft >= aLeft && thePxLeft <= aRight && thePxTop >= aTop && thePxTop <= aBottom) ||
        (thePxLeft >= aLeft && thePxLeft <= aRight && thePxBottom >= aTop && thePxBottom <= aBottom) ||
        (thePxRight >= aLeft && thePxRight <= aRight && thePxTop >= aTop && thePxTop <= aBottom) ||
        (thePxRight >= aLeft && thePxRight <= aRight && thePxBottom >= aTop && thePxBottom <= aBottom))
    {
      theViewId = anIter.Key1();
      return Standard_True;
    }
  }
  return Standard_False;
}

// Workaround: to create and delete non-orthographic views outside ViewerTest
void ViewerTest::RemoveViewName (const TCollection_AsciiString& theName)
{
  ViewerTest_myViews.UnBind1 (theName);
}

void ViewerTest::InitViewName (const TCollection_AsciiString& theName,
                               const Handle(V3d_View)& theView)
{
  ViewerTest_myViews.Bind (theName, theView);
}

TCollection_AsciiString ViewerTest::GetCurrentViewName ()
{
  return ViewerTest_myViews.Find2( ViewerTest::CurrentView());
}

//==============================================================================
//function : ViewerInit
//purpose  : Create the window viewer and initialize all the global variable
//==============================================================================

TCollection_AsciiString ViewerTest::ViewerInit (const Standard_Integer thePxLeft,
                                                const Standard_Integer thePxTop,
                                                const Standard_Integer thePxWidth,
                                                const Standard_Integer thePxHeight,
                                                const TCollection_AsciiString& theViewName,
                                                const TCollection_AsciiString& theDisplayName,
                                                const Handle(V3d_View)& theViewToClone,
                                                const Standard_Boolean theIsVirtual)
{
  // Default position and dimension of the viewer window.
  // Note that left top corner is set to be sufficiently small to have
  // window fit in the small screens (actual for remote desktops, see #23003).
  // The position corresponds to the window's client area, thus some
  // gap is added for window frame to be visible.
  Standard_Integer aPxLeft  = 20,  aPxTop    = 40;
  Standard_Integer aPxWidth = 409, aPxHeight = 409;
  Standard_Boolean isDefViewSize = Standard_True;
  Standard_Boolean toCreateViewer = Standard_False;
  const Standard_Boolean isVirtual = Draw_VirtualWindows || theIsVirtual;
  if (!theViewToClone.IsNull())
  {
    theViewToClone->Window()->Size (aPxWidth, aPxHeight);
    isDefViewSize = Standard_False;
  #if !defined(__EMSCRIPTEN__)
    (void )isDefViewSize;
  #endif
  }

  Handle(Graphic3d_GraphicDriverFactory) aFactory = Graphic3d_GraphicDriverFactory::DefaultDriverFactory();
  if (aFactory.IsNull())
  {
    Draw::GetInterpretor().Eval ("pload OPENGL");
    aFactory = Graphic3d_GraphicDriverFactory::DefaultDriverFactory();
    if (aFactory.IsNull())
    {
      Draw::GetInterpretor().Eval ("pload GLES");
      aFactory = Graphic3d_GraphicDriverFactory::DefaultDriverFactory();
      if (aFactory.IsNull())
      {
        throw Standard_ProgramError("Error: no graphic driver factory found");
      }
    }
  }

  Handle(Graphic3d_GraphicDriver) aGraphicDriver;
  ViewerTest_Names aViewNames(theViewName);
  if (ViewerTest_myViews.IsBound1 (aViewNames.GetViewName()))
  {
    aViewNames.SetViewName (aViewNames.GetViewerName() + "/" + CreateName<Handle(V3d_View)>(ViewerTest_myViews, "View"));
  }

  if (thePxLeft != 0)
  {
    aPxLeft = thePxLeft;
  }
  if (thePxTop != 0)
  {
    aPxTop = thePxTop;
  }
  if (thePxWidth != 0)
  {
    isDefViewSize = Standard_False;
    aPxWidth = thePxWidth;
  }
  if (thePxHeight != 0)
  {
    isDefViewSize = Standard_False;
    aPxHeight = thePxHeight;
  }

  // Get graphic driver (create it or get from another view)
  const bool isNewDriver = !ViewerTest_myDrivers.IsBound1 (aViewNames.GetDriverName());
  if (isNewDriver)
  {
    // Get connection string
  #if defined(HAVE_XLIB)
    if (!theDisplayName.IsEmpty())
    {
      SetDisplayConnection (new Aspect_DisplayConnection (theDisplayName));
    }
    else
    {
      Aspect_XDisplay* aDispX = NULL;
      // create dedicated display connection instead of reusing Tk connection
      // so that to proceed events independently through VProcessEvents()/ViewerMainLoop() callbacks
      /*Draw_Interpretor& aCommands = Draw::GetInterpretor();
      Tcl_Interp* aTclInterp = aCommands.Interp();
      Tk_Window aMainWindow = Tk_MainWindow (aTclInterp);
      aDispX = aMainWindow != NULL ? Tk_Display (aMainWindow) : NULL;*/
      SetDisplayConnection (new Aspect_DisplayConnection (aDispX));
    }
  #else
    (void)theDisplayName; // avoid warning on unused argument
    SetDisplayConnection (new Aspect_DisplayConnection ());
  #endif

    aGraphicDriver = aFactory->CreateDriver (GetDisplayConnection());
    if (isVirtual)
    {
      // don't waste the time waiting for VSync when window is not displayed on the screen
      aGraphicDriver->SetVerticalSync (false);
    }

    ViewerTest_myDrivers.Bind (aViewNames.GetDriverName(), aGraphicDriver);
    toCreateViewer = Standard_True;
  }
  else
  {
    aGraphicDriver = ViewerTest_myDrivers.Find1 (aViewNames.GetDriverName());
  }

  //Dispose the window if input parameters are default
  if (!ViewerTest_myViews.IsEmpty() && thePxLeft == 0 && thePxTop == 0)
  {
    Standard_Integer aTop = 0,
                     aLeft = 0,
                     aRight = 0,
                     aBottom = 0,
                     aScreenWidth = 0,
                     aScreenHeight = 0;

    // Get screen resolution
#if defined(_WIN32)
    RECT aWindowSize;
    GetClientRect(GetDesktopWindow(), &aWindowSize);
    aScreenHeight = aWindowSize.bottom;
    aScreenWidth = aWindowSize.right;
#elif defined(HAVE_XLIB)
    ::Display* aDispX = (::Display* )GetDisplayConnection()->GetDisplayAspect();
    Screen* aScreen = DefaultScreenOfDisplay(aDispX);
    aScreenWidth  = WidthOfScreen(aScreen);
    aScreenHeight = HeightOfScreen(aScreen);
#elif defined(__APPLE__)
    GetCocoaScreenResolution (aScreenWidth, aScreenHeight);
#else
    // not implemented
#endif

    TCollection_AsciiString anOverlappedViewId("");

    while (IsWindowOverlapped (aPxLeft, aPxTop, aPxLeft + aPxWidth, aPxTop + aPxHeight, anOverlappedViewId))
    {
      ViewerTest_myViews.Find1(anOverlappedViewId)->Window()->Position (aLeft, aTop, aRight, aBottom);

      if (IsWindowOverlapped (aRight + 20, aPxTop, aRight + 20 + aPxWidth, aPxTop + aPxHeight, anOverlappedViewId)
        && aRight + 2*aPxWidth + 40 > aScreenWidth)
      {
        if (aBottom + aPxHeight + 40 > aScreenHeight)
        {
          aPxLeft = 20;
          aPxTop = 40;
          break;
        }
        aPxLeft = 20;
        aPxTop = aBottom + 40;
      }
      else
        aPxLeft = aRight + 20;
    }
  }

  // Get viewer name
  TCollection_AsciiString aTitle("3D View - ");
  aTitle = aTitle + aViewNames.GetViewName() + "(*)";

  // Change name of current active window
  if (const Handle(V3d_View)& aCurrentView = ViewerTest::CurrentView())
  {
    aCurrentView->Window()->SetTitle (TCollection_AsciiString ("3D View - ") + ViewerTest_myViews.Find2 (aCurrentView));
  }

  // Create viewer
  Handle(V3d_Viewer) a3DViewer;
  // If it's the single view, we first look for empty context
  if (ViewerTest_myViews.IsEmpty() && !ViewerTest_myContexts.IsEmpty())
  {
    NCollection_DoubleMap <TCollection_AsciiString, Handle(AIS_InteractiveContext)>::Iterator
      anIter(ViewerTest_myContexts);
    if (anIter.More())
      ViewerTest::SetAISContext (anIter.Value());
    a3DViewer = ViewerTest::GetAISContext()->CurrentViewer();
  }
  else if (ViewerTest_myContexts.IsBound1(aViewNames.GetViewerName()))
  {
    ViewerTest::SetAISContext(ViewerTest_myContexts.Find1(aViewNames.GetViewerName()));
    a3DViewer = ViewerTest::GetAISContext()->CurrentViewer();
  }
  else if (a3DViewer.IsNull())
  {
    toCreateViewer = Standard_True;
    a3DViewer = new V3d_Viewer(aGraphicDriver);
    a3DViewer->SetDefaultBackgroundColor (ViewerTest_DefaultBackground.FlatColor);
    a3DViewer->SetDefaultBgGradientColors (ViewerTest_DefaultBackground.GradientColor1,
                                           ViewerTest_DefaultBackground.GradientColor2,
                                           ViewerTest_DefaultBackground.FillMethod);
  }

  // AIS context setup
  if (ViewerTest::GetAISContext().IsNull() ||
      !(ViewerTest_myContexts.IsBound1(aViewNames.GetViewerName())))
  {
    Handle(AIS_InteractiveContext) aContext = new AIS_InteractiveContext (a3DViewer);
    ViewerTest::SetAISContext (aContext);
    ViewerTest_myContexts.Bind (aViewNames.GetViewerName(), ViewerTest::GetAISContext());
  }
  else
  {
    ViewerTest::ResetEventManager();
  }

  // Create window
#if defined(_WIN32)
  VT_GetWindow() = new WNT_Window (aTitle.ToCString(), WClass(),
                                   isVirtual ? WS_POPUP : WS_OVERLAPPEDWINDOW,
                                    aPxLeft, aPxTop,
                                    aPxWidth, aPxHeight,
                                    Quantity_NOC_BLACK);
  VT_GetWindow()->RegisterRawInputDevices (WNT_Window::RawInputMask_SpaceMouse);
#elif defined(HAVE_XLIB)
  VT_GetWindow() = new Xw_Window (aGraphicDriver->GetDisplayConnection(),
                                  aTitle.ToCString(),
                                  aPxLeft, aPxTop,
                                  aPxWidth, aPxHeight);
#elif defined(__APPLE__)
  VT_GetWindow() = new Cocoa_Window (aTitle.ToCString(),
                                     aPxLeft, aPxTop,
                                     aPxWidth, aPxHeight);
  ViewerTest_SetCocoaEventManagerView (VT_GetWindow());
#elif defined(__EMSCRIPTEN__)
  // current EGL implementation in Emscripten supports only one global WebGL canvas returned by Module.canvas property;
  // the code should be revised for handling multiple canvas elements (which is technically also possible)
  TCollection_AsciiString aCanvasId = getModuleCanvasId();
  if (!aCanvasId.IsEmpty())
  {
    aCanvasId = TCollection_AsciiString("#") + aCanvasId;
  }

  VT_GetWindow() = new Wasm_Window (aCanvasId);
  Graphic3d_Vec2i aRealSize;
  VT_GetWindow()->Size (aRealSize.x(), aRealSize.y());
  if (!isDefViewSize || (aRealSize.x() <= 0 && aRealSize.y() <= 0))
  {
    // Wasm_Window wraps an existing HTML element without creating a new one.
    // Keep size defined on a web page instead of defaulting to 409x409 (as in case of other platform),
    // but resize canvas if vinit has been called with explicitly specified dimensions.
    VT_GetWindow()->SetSizeLogical (Graphic3d_Vec2d (aPxWidth, aPxHeight));
  }
#else
  // not implemented
  VT_GetWindow() = new Aspect_NeutralWindow();
  VT_GetWindow()->SetSize (aPxWidth, aPxHeight);
#endif
  VT_GetWindow()->SetVirtual (isVirtual);

  // View setup
  Handle(V3d_View) aView;
  if (!theViewToClone.IsNull())
  {
    aView = new ViewerTest_V3dView (a3DViewer, theViewToClone);
  }
  else
  {
    aView = new ViewerTest_V3dView (a3DViewer, a3DViewer->DefaultTypeOfView());
  }

  aView->SetWindow (VT_GetWindow());
  ViewerTest::GetAISContext()->RedrawImmediate (a3DViewer);

  ViewerTest::CurrentView(aView);
  ViewerTest_myViews.Bind (aViewNames.GetViewName(), aView);

  // Setup for X11 or NT
  SetDisplayConnection (ViewerTest::CurrentView()->Viewer()->Driver()->GetDisplayConnection());
  ViewerTest_EventManager::SetupWindowCallbacks (VT_GetWindow());

  // Set parameters for V3d_View and V3d_Viewer
  const Handle (V3d_View) aV3dView = ViewerTest::CurrentView();
  aV3dView->SetComputedMode(Standard_False);

  a3DViewer->SetDefaultBackgroundColor(Quantity_NOC_BLACK);
  if (toCreateViewer)
  {
    a3DViewer->SetDefaultLights();
    a3DViewer->SetLightOn();
  }

#if defined(HAVE_XLIB)
  if (isNewDriver)
  {
    ::Display* aDispX = (::Display* )GetDisplayConnection()->GetDisplayAspect();
    Tcl_CreateFileHandler (XConnectionNumber (aDispX), TCL_READABLE, VProcessEvents, (ClientData )aDispX);
  }
#endif

  VT_GetWindow()->Map();

  // Set the handle of created view in the event manager
  ViewerTest::ResetEventManager();

  ViewerTest::CurrentView()->Redraw();

  aView.Nullify();
  a3DViewer.Nullify();

  return aViewNames.GetViewName();
}

//==============================================================================
//function : RedrawAllViews
//purpose  : Redraw all created views
//==============================================================================
void ViewerTest::RedrawAllViews()
{
  NCollection_DoubleMap<TCollection_AsciiString, Handle(V3d_View)>::Iterator aViewIt(ViewerTest_myViews);
  for (; aViewIt.More(); aViewIt.Next())
  {
    const Handle(V3d_View)& aView = aViewIt.Key2();
    aView->Redraw();
  }
}

//==============================================================================
//function : VDriver
//purpose  :
//==============================================================================
static int VDriver (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  if (theArgsNb == 1)
  {
    theDi << "Registered: ";
    for (Graphic3d_GraphicDriverFactoryList::Iterator aFactoryIter (Graphic3d_GraphicDriverFactory::DriverFactories());
         aFactoryIter.More(); aFactoryIter.Next())
    {
      const Handle(Graphic3d_GraphicDriverFactory)& aFactory = aFactoryIter.Value();
      theDi << aFactory->Name() << " ";
    }

    theDi << "\n";
    theDi << "Default: ";
    if (Handle(Graphic3d_GraphicDriverFactory) aFactory =  Graphic3d_GraphicDriverFactory::DefaultDriverFactory())
    {
      theDi << aFactory->Name();
    }
    else
    {
      theDi << "NONE";
    }
    return 0;
  }

  TCollection_AsciiString aNewActive;
  bool toLoad = false;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString anArgCase (theArgVec[anArgIter]);
    anArgCase.LowerCase();
    if (anArgCase == "-list")
    {
      for (Graphic3d_GraphicDriverFactoryList::Iterator aFactoryIter (Graphic3d_GraphicDriverFactory::DriverFactories());
           aFactoryIter.More(); aFactoryIter.Next())
      {
        const Handle(Graphic3d_GraphicDriverFactory)& aFactory = aFactoryIter.Value();
        theDi << aFactory->Name() << " ";
      }
    }
    else if ((anArgCase == "-default"
           || anArgCase == "-load")
          && aNewActive.IsEmpty())
    {
      toLoad = (anArgCase == "-load");
      if (anArgIter + 1 < theArgsNb)
      {
        aNewActive = theArgVec[++anArgIter];
      }
      else if (toLoad)
      {
        theDi << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }
      else
      {
        if (Handle(Graphic3d_GraphicDriverFactory) aFactory =  Graphic3d_GraphicDriverFactory::DefaultDriverFactory())
        {
          theDi << aFactory->Name();
        }
        else
        {
          theDi << "NONE";
        }
      }
    }
    else if (aNewActive.IsEmpty())
    {
      aNewActive = theArgVec[anArgIter];
    }
    else
    {
      theDi << "Syntax error: unknown argument '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }

  if (!aNewActive.IsEmpty())
  {
    const TCollection_AsciiString aNameCopy = aNewActive;
    if (TCollection_AsciiString::IsSameString (aNewActive, "gl", false)
     || TCollection_AsciiString::IsSameString (aNewActive, "opengl", false)
     || TCollection_AsciiString::IsSameString (aNewActive, "tkopengl", false))
    {
      aNewActive = "tkopengl";
    }
    else if (TCollection_AsciiString::IsSameString (aNewActive, "gles", false)
          || TCollection_AsciiString::IsSameString (aNewActive, "opengles", false)
          || TCollection_AsciiString::IsSameString (aNewActive, "tkopengles", false))
    {
      aNewActive = "tkopengles";
    }
    else if (TCollection_AsciiString::IsSameString (aNewActive, "d3d", false)
          || TCollection_AsciiString::IsSameString (aNewActive, "d3dhost", false)
          || TCollection_AsciiString::IsSameString (aNewActive, "tkd3dhost", false))
    {
      aNewActive = "tkd3dhost";
    }

    if (toLoad)
    {
      if (aNewActive == "tkopengl")
      {
        Draw::GetInterpretor().Eval ("pload OPENGL");
      }
      else if (aNewActive == "tkopengles")
      {
        Draw::GetInterpretor().Eval ("pload GLES");
      }
      else if (aNewActive == "tkd3dhost")
      {
        Draw::GetInterpretor().Eval ("pload D3DHOST");
      }
      else
      {
        theDi << "Syntax error: unable to load plugin for unknown driver factory '" << aNameCopy << "'";
        return 1;
      }
    }

    bool isFound = false;
    for (Graphic3d_GraphicDriverFactoryList::Iterator aFactoryIter (Graphic3d_GraphicDriverFactory::DriverFactories());
         aFactoryIter.More(); aFactoryIter.Next())
    {
      Handle(Graphic3d_GraphicDriverFactory) aFactory = aFactoryIter.Value();
      if (TCollection_AsciiString::IsSameString (aFactory->Name(), aNewActive, false))
      {
        Graphic3d_GraphicDriverFactory::RegisterFactory (aFactory, true);
        isFound = true;
        break;
      }
    }

    if (!isFound)
    {
      theDi << "Syntax error: driver factory '" << aNameCopy << "' not found";
      return 1;
    }
  }

  return 0;
}

//==============================================================================
//function : Vinit
//purpose  : Create the window viewer and initialize all the global variable
//    Use Tcl_CreateFileHandler on UNIX to catch the X11 Viewer event
//==============================================================================
static int VInit (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  TCollection_AsciiString aViewName, aDisplayName;
  Standard_Integer aPxLeft = 0, aPxTop = 0, aPxWidth = 0, aPxHeight = 0;
  Standard_Boolean isVirtual = false;
  Handle(V3d_View) aCopyFrom;
  TCollection_AsciiString aName, aValue;
  int is2dMode = -1;
  for (Standard_Integer anArgIt = 1; anArgIt < theArgsNb; ++anArgIt)
  {
    const TCollection_AsciiString anArg = theArgVec[anArgIt];
    TCollection_AsciiString anArgCase = anArg;
    anArgCase.LowerCase();
    if (anArgIt + 1 < theArgsNb
     && anArgCase == "-name")
    {
      aViewName = theArgVec[++anArgIt];
    }
    else if (anArgIt + 1 < theArgsNb
          && (anArgCase == "-left"
           || anArgCase == "-l"))
    {
      aPxLeft = Draw::Atoi (theArgVec[++anArgIt]);
    }
    else if (anArgIt + 1 < theArgsNb
          && (anArgCase == "-top"
           || anArgCase == "-t"))
    {
      aPxTop = Draw::Atoi (theArgVec[++anArgIt]);
    }
    else if (anArgIt + 1 < theArgsNb
          && (anArgCase == "-width"
           || anArgCase == "-w"))
    {
      aPxWidth = Draw::Atoi (theArgVec[++anArgIt]);
    }
    else if (anArgIt + 1 < theArgsNb
          && (anArgCase == "-height"
           || anArgCase == "-h"))
    {
      aPxHeight = Draw::Atoi (theArgVec[++anArgIt]);
    }
    else if (anArgCase == "-virtual"
          || anArgCase == "-offscreen")
    {
      isVirtual = true;
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], isVirtual))
      {
        ++anArgIt;
      }
    }
    else if (anArgCase == "-exitonclose")
    {
      ViewerTest_EventManager::ToExitOnCloseView() = true;
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], ViewerTest_EventManager::ToExitOnCloseView()))
      {
        ++anArgIt;
      }
    }
    else if (anArgCase == "-closeonescape"
          || anArgCase == "-closeonesc")
    {
      ViewerTest_EventManager::ToCloseViewOnEscape() = true;
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], ViewerTest_EventManager::ToCloseViewOnEscape()))
      {
        ++anArgIt;
      }
    }
    else if (anArgCase == "-2d_mode"
          || anArgCase == "-2dmode"
          || anArgCase == "-2d")
    {
      bool toEnable = true;
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], toEnable))
      {
        ++anArgIt;
      }
      is2dMode = toEnable ? 1 : 0;
    }
    else if (anArgIt + 1 < theArgsNb
          && (anArgCase == "-disp"
           || anArgCase == "-display"))
    {
      aDisplayName = theArgVec[++anArgIt];
    }
    else if (!ViewerTest::CurrentView().IsNull()
          &&  aCopyFrom.IsNull()
          && (anArgCase == "-copy"
           || anArgCase == "-clone"
           || anArgCase == "-cloneactive"
           || anArgCase == "-cloneactiveview"))
    {
      aCopyFrom = ViewerTest::CurrentView();
    }
    // old syntax
    else if (ViewerTest::SplitParameter (anArg, aName, aValue))
    {
      aName.LowerCase();
      if (aName == "name")
      {
        aViewName = aValue;
      }
      else if (aName == "l"
            || aName == "left")
      {
        aPxLeft = aValue.IntegerValue();
      }
      else if (aName == "t"
            || aName == "top")
      {
        aPxTop = aValue.IntegerValue();
      }
      else if (aName == "disp"
            || aName == "display")
      {
        aDisplayName = aValue;
      }
      else if (aName == "w"
            || aName == "width")
      {
        aPxWidth = aValue.IntegerValue();
      }
      else if (aName == "h"
            || aName == "height")
      {
        aPxHeight = aValue.IntegerValue();
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown argument " << anArg;
        return 1;
      }
    }
    else if (aViewName.IsEmpty())
    {
      aViewName = anArg;
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument " << anArg;
      return 1;
    }
  }

#if !defined(HAVE_XLIB)
  if (!aDisplayName.IsEmpty())
  {
    aDisplayName.Clear();
    Message::SendWarning() << "Warning: display parameter will be ignored.\n";
  }
#endif

  ViewerTest_Names aViewNames (aViewName);
  if (ViewerTest_myViews.IsBound1 (aViewNames.GetViewName()))
  {
    TCollection_AsciiString aCommand = TCollection_AsciiString ("vactivate ") + aViewNames.GetViewName();
    theDi.Eval (aCommand.ToCString());
    if (is2dMode != -1)
    {
      ViewerTest_V3dView::SetCurrentView2DMode (is2dMode == 1);
    }
    return 0;
  }

  TCollection_AsciiString aViewId = ViewerTest::ViewerInit (aPxLeft, aPxTop, aPxWidth, aPxHeight,
                                                            aViewName, aDisplayName, aCopyFrom, isVirtual);
  if (is2dMode != -1)
  {
    ViewerTest_V3dView::SetCurrentView2DMode (is2dMode == 1);
  }
  theDi << aViewId;
  return 0;
}

//! Parse HLR algo type.
static Standard_Boolean parseHlrAlgoType (const char* theName,
                                          Prs3d_TypeOfHLR& theType)
{
  TCollection_AsciiString aName (theName);
  aName.LowerCase();
  if (aName == "polyalgo")
  {
    theType = Prs3d_TOH_PolyAlgo;
  }
  else if (aName == "algo")
  {
    theType = Prs3d_TOH_Algo;
  }
  else
  {
    return Standard_False;
  }
  return Standard_True;
}

//==============================================================================
//function : VHLR
//purpose  : hidden lines removal algorithm
//==============================================================================

static int VHLR (Draw_Interpretor& di, Standard_Integer argc, const char** argv)
{
  const Handle(V3d_View) aView = ViewerTest::CurrentView();
  const Handle(AIS_InteractiveContext) aCtx = ViewerTest::GetAISContext();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean hasHlrOnArg = Standard_False;
  Standard_Boolean hasShowHiddenArg = Standard_False;
  Standard_Boolean isHLROn = Standard_False;
  Standard_Boolean toShowHidden = aCtx->DefaultDrawer()->DrawHiddenLine();
  Prs3d_TypeOfHLR  aTypeOfHLR = Prs3d_TOH_NotSet;
  ViewerTest_AutoUpdater anUpdateTool (Handle(AIS_InteractiveContext)(), aView);
  for (Standard_Integer anArgIter = 1; anArgIter < argc; ++anArgIter)
  {
    TCollection_AsciiString anArg (argv[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      continue;
    }
    else if (anArg == "-showhidden"
          && anArgIter + 1 < argc
          && Draw::ParseOnOff (argv[anArgIter + 1], toShowHidden))
    {
      ++anArgIter;
      hasShowHiddenArg = Standard_True;
      continue;
    }
    else if ((anArg == "-type"
           || anArg == "-algo"
           || anArg == "-algotype")
          && anArgIter + 1 < argc
          && parseHlrAlgoType (argv[anArgIter + 1], aTypeOfHLR))
    {
      ++anArgIter;
      continue;
    }
    else if (!hasHlrOnArg
          && Draw::ParseOnOff (argv[anArgIter], isHLROn))
    {
      hasHlrOnArg = Standard_True;
      continue;
    }
    // old syntax
    else if (!hasShowHiddenArg
          && Draw::ParseOnOff(argv[anArgIter], toShowHidden))
    {
      hasShowHiddenArg = Standard_True;
      continue;
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << argv[anArgIter] << "'";
      return 1;
    }
  }
  if (!hasHlrOnArg)
  {
    di << "HLR:        " << aView->ComputedMode() << "\n";
    di << "HiddenLine: " << aCtx->DefaultDrawer()->DrawHiddenLine() << "\n";
    di << "HlrAlgo:    ";
    switch (aCtx->DefaultDrawer()->TypeOfHLR())
    {
      case Prs3d_TOH_NotSet:   di << "NotSet\n";   break;
      case Prs3d_TOH_PolyAlgo: di << "PolyAlgo\n"; break;
      case Prs3d_TOH_Algo:     di << "Algo\n";     break;
    }
    anUpdateTool.Invalidate();
    return 0;
  }

  Standard_Boolean toRecompute = Standard_False;
  if (aTypeOfHLR != Prs3d_TOH_NotSet
   && aTypeOfHLR != aCtx->DefaultDrawer()->TypeOfHLR())
  {
    toRecompute = Standard_True;
    aCtx->DefaultDrawer()->SetTypeOfHLR (aTypeOfHLR);
  }
  if (toShowHidden != aCtx->DefaultDrawer()->DrawHiddenLine())
  {
    toRecompute = Standard_True;
    if (toShowHidden)
    {
      aCtx->DefaultDrawer()->EnableDrawHiddenLine();
    }
    else
    {
      aCtx->DefaultDrawer()->DisableDrawHiddenLine();
    }
  }

  // redisplay shapes
  if (aView->ComputedMode() && isHLROn && toRecompute)
  {
    AIS_ListOfInteractive aListOfShapes;
    aCtx->DisplayedObjects (aListOfShapes);
    for (AIS_ListIteratorOfListOfInteractive anIter (aListOfShapes); anIter.More(); anIter.Next())
    {
      if (Handle(AIS_Shape) aShape = Handle(AIS_Shape)::DownCast(anIter.Value()))
      {
        aCtx->Redisplay (aShape, Standard_False);
      }
    }
  }

  aView->SetComputedMode (isHLROn);
  return 0;
}

//==============================================================================
//function : VHLRType
//purpose  : change type of using HLR algorithm
//==============================================================================

static int VHLRType (Draw_Interpretor& , Standard_Integer argc, const char** argv)
{
  const Handle(V3d_View) aView = ViewerTest::CurrentView();
  const Handle(AIS_InteractiveContext) aCtx = ViewerTest::GetAISContext();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Prs3d_TypeOfHLR aTypeOfHLR = Prs3d_TOH_NotSet;
  ViewerTest_AutoUpdater anUpdateTool (Handle(AIS_InteractiveContext)(), aView);
  AIS_ListOfInteractive aListOfShapes;
  for (Standard_Integer anArgIter = 1; anArgIter < argc; ++anArgIter)
  {
    TCollection_AsciiString anArg (argv[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      continue;
    }
    else if ((anArg == "-type"
           || anArg == "-algo"
           || anArg == "-algotype")
          && anArgIter + 1 < argc
          && parseHlrAlgoType (argv[anArgIter + 1], aTypeOfHLR))
    {
      ++anArgIter;
      continue;
    }
    // old syntax
    else if (aTypeOfHLR == Prs3d_TOH_NotSet
          && parseHlrAlgoType (argv[anArgIter], aTypeOfHLR))
    {
      continue;
    }
    else
    {
      ViewerTest_DoubleMapOfInteractiveAndName& aMap = GetMapOfAIS();
      TCollection_AsciiString aName (argv[anArgIter]);
      if (!aMap.IsBound2 (aName))
      {
        Message::SendFail() << "Syntax error: Wrong shape name '" << aName << "'";
        return 1;
      }

      Handle(AIS_Shape) aShape = Handle(AIS_Shape)::DownCast (aMap.Find2 (aName));
      if (aShape.IsNull())
      {
        Message::SendFail() << "Syntax error: '" << aName << "' is not a shape presentation";
        return 1;
      }
      aListOfShapes.Append (aShape);
      continue;
    }
  }
  if (aTypeOfHLR == Prs3d_TOH_NotSet)
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }

  const Standard_Boolean isGlobal = aListOfShapes.IsEmpty();
  if (isGlobal)
  {
    aCtx->DisplayedObjects (aListOfShapes);
    aCtx->DefaultDrawer()->SetTypeOfHLR (aTypeOfHLR);
  }

  for (AIS_ListIteratorOfListOfInteractive anIter(aListOfShapes); anIter.More(); anIter.Next())
  {
    Handle(AIS_Shape) aShape = Handle(AIS_Shape)::DownCast(anIter.Value());
    if (aShape.IsNull())
    {
      continue;
    }

    const bool toUpdateShape = aShape->TypeOfHLR() != aTypeOfHLR
                            && aView->ComputedMode();
    if (!isGlobal
     || aShape->TypeOfHLR() != aTypeOfHLR)
    {
      aShape->SetTypeOfHLR (aTypeOfHLR);
    }
    if (toUpdateShape)
    {
      aCtx->Redisplay (aShape, Standard_False);
    }
  }
  return 0;
}

//==============================================================================
//function : FindViewIdByWindowHandle
//purpose  : Find theView Id in the map of views by window handle
//==============================================================================
#if defined(_WIN32) || defined(HAVE_XLIB)
static TCollection_AsciiString FindViewIdByWindowHandle (Aspect_Drawable theWindowHandle)
{
  for (NCollection_DoubleMap<TCollection_AsciiString, Handle(V3d_View)>::Iterator
       anIter(ViewerTest_myViews); anIter.More(); anIter.Next())
  {
    Aspect_Drawable aWindowHandle = anIter.Value()->Window()->NativeHandle();
    if (aWindowHandle == theWindowHandle)
      return anIter.Key1();
  }
  return TCollection_AsciiString("");
}
#endif

//! Make the view active
void ActivateView (const TCollection_AsciiString& theViewName,
                   Standard_Boolean theToUpdate = Standard_True)
{
  const Handle(V3d_View) aView = ViewerTest_myViews.Find1(theViewName);
  if (aView.IsNull())
  {
    return;
  }

  Handle(AIS_InteractiveContext) anAISContext = FindContextByView(aView);
  if (!anAISContext.IsNull())
  {
    if (const Handle(V3d_View)& aCurrentView = ViewerTest::CurrentView())
    {
      aCurrentView->Window()->SetTitle (TCollection_AsciiString ("3D View - ") + ViewerTest_myViews.Find2 (aCurrentView));
    }

    ViewerTest::CurrentView (aView);
    ViewerTest::SetAISContext (anAISContext);
    aView->Window()->SetTitle (TCollection_AsciiString("3D View - ") + theViewName + "(*)");
    VT_GetWindow() = Handle(ViewerTest_Window)::DownCast(ViewerTest::CurrentView()->Window());
    SetDisplayConnection(ViewerTest::CurrentView()->Viewer()->Driver()->GetDisplayConnection());
    if (theToUpdate)
    {
      ViewerTest::CurrentView()->Redraw();
    }
  }
}

//==============================================================================
//function : RemoveView
//purpose  :
//==============================================================================
void ViewerTest::RemoveView (const Handle(V3d_View)& theView,
                             const Standard_Boolean  theToRemoveContext)
{
  if (!ViewerTest_myViews.IsBound2 (theView))
  {
    return;
  }

  const TCollection_AsciiString aViewName = ViewerTest_myViews.Find2 (theView);
  RemoveView (aViewName, theToRemoveContext);
}

//==============================================================================
//function : RemoveView
//purpose  : Close and remove view from display, clear maps if necessary
//==============================================================================
void ViewerTest::RemoveView (const TCollection_AsciiString& theViewName, const Standard_Boolean isContextRemoved)
{
  if (!ViewerTest_myViews.IsBound1(theViewName))
  {
    Message::SendFail() << "Wrong view name";
    return;
  }

  // Activate another view if it's active now
  if (ViewerTest_myViews.Find1(theViewName) == ViewerTest::CurrentView())
  {
    if (ViewerTest_myViews.Extent() > 1)
    {
      TCollection_AsciiString aNewViewName;
      for (NCollection_DoubleMap <TCollection_AsciiString, Handle(V3d_View)>::Iterator anIter (ViewerTest_myViews);
           anIter.More(); anIter.Next())
      {
        if (anIter.Key1() != theViewName)
        {
          aNewViewName = anIter.Key1();
          break;
        }
      }
      ActivateView (aNewViewName);
    }
    else
    {
      VT_GetWindow().Nullify();
      ViewerTest::CurrentView (Handle(V3d_View)());
      if (isContextRemoved)
      {
        Handle(AIS_InteractiveContext) anEmptyContext;
        ViewerTest::SetAISContext(anEmptyContext);
      }
    }
  }

  // Delete view
  Handle(V3d_View) aView = ViewerTest_myViews.Find1(theViewName);
  Handle(AIS_InteractiveContext) aCurrentContext = FindContextByView(aView);
  ViewerTest_ContinuousRedrawer& aRedrawer = ViewerTest_ContinuousRedrawer::Instance();
  aRedrawer.Stop (aView->Window());

  // Remove view resources
  ViewerTest_myViews.UnBind1(theViewName);
  aView->Window()->Unmap();
  aView->Remove();

#if defined(HAVE_XLIB)
  XFlush ((::Display* )GetDisplayConnection()->GetDisplayAspect());
#endif

  // Keep context opened only if the closed view is last to avoid
  // unused empty contexts
  if (!aCurrentContext.IsNull())
  {
    // Check if there are more difined views in the viewer
    if ((isContextRemoved || ViewerTest_myContexts.Size() != 1)
     && aCurrentContext->CurrentViewer()->DefinedViews().IsEmpty())
    {
      // Remove driver if there is no viewers that use it
      Standard_Boolean isRemoveDriver = Standard_True;
      for(NCollection_DoubleMap<TCollection_AsciiString, Handle(AIS_InteractiveContext)>::Iterator
          anIter(ViewerTest_myContexts); anIter.More(); anIter.Next())
      {
        if (aCurrentContext != anIter.Key2() &&
          aCurrentContext->CurrentViewer()->Driver() == anIter.Value()->CurrentViewer()->Driver())
        {
          isRemoveDriver = Standard_False;
          break;
        }
      }

      aCurrentContext->RemoveAll (Standard_False);
      if(isRemoveDriver)
      {
        ViewerTest_myDrivers.UnBind2 (aCurrentContext->CurrentViewer()->Driver());
      #if defined(HAVE_XLIB)
        Tcl_DeleteFileHandler (XConnectionNumber ((::Display* )aCurrentContext->CurrentViewer()->Driver()->GetDisplayConnection()->GetDisplayAspect()));
      #endif
      }

      ViewerTest_myContexts.UnBind2(aCurrentContext);
    }
  }
  Message::SendInfo() << "3D View - " << theViewName << " was deleted.\n";
  if (ViewerTest_EventManager::ToExitOnCloseView())
  {
    Draw_Interprete ("exit");
  }
}

//==============================================================================
//function : VClose
//purpose  : Remove the view defined by its name
//==============================================================================

static int VClose (Draw_Interpretor& /*theDi*/,
                   Standard_Integer  theArgsNb,
                   const char**      theArgVec)
{
  NCollection_List<TCollection_AsciiString> aViewList;
  if (theArgsNb > 1)
  {
    TCollection_AsciiString anArg (theArgVec[1]);
    anArg.UpperCase();
    if (anArg.IsEqual ("ALL")
     || anArg.IsEqual ("*"))
    {
      for (NCollection_DoubleMap<TCollection_AsciiString, Handle(V3d_View)>::Iterator anIter (ViewerTest_myViews);
           anIter.More(); anIter.Next())
      {
        aViewList.Append (anIter.Key1());
      }
      if (aViewList.IsEmpty())
      {
        std::cout << "No view to close\n";
        return 0;
      }
    }
    else
    {
      ViewerTest_Names aViewName (theArgVec[1]);
      if (!ViewerTest_myViews.IsBound1 (aViewName.GetViewName()))
      {
        Message::SendFail() << "Error: the view with name '" << theArgVec[1] << "' does not exist";
        return 1;
      }
      aViewList.Append (aViewName.GetViewName());
    }
  }
  else
  {
    // close active view
    if (ViewerTest::CurrentView().IsNull())
    {
      Message::SendFail ("Error: no active view");
      return 1;
    }
    aViewList.Append (ViewerTest_myViews.Find2 (ViewerTest::CurrentView()));
  }

  Standard_Boolean toRemoveContext = (theArgsNb != 3 || Draw::Atoi (theArgVec[2]) != 1);
  for (NCollection_List<TCollection_AsciiString>::Iterator anIter(aViewList);
       anIter.More(); anIter.Next())
  {
    ViewerTest::RemoveView (anIter.Value(), toRemoveContext);
  }

  return 0;
}

//==============================================================================
//function : VActivate
//purpose  : Activate the view defined by its ID
//==============================================================================

static int VActivate (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  if (theArgsNb == 1)
  {
    theDi.Eval("vviewlist");
    return 0;
  }

  TCollection_AsciiString aNameString;
  Standard_Boolean toUpdate = Standard_True;
  Standard_Boolean toActivate = Standard_True;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (toUpdate
     && anArg == "-noupdate")
    {
      toUpdate = Standard_False;
    }
    else if (toActivate
          && aNameString.IsEmpty()
          && anArg == "none")
    {
      ViewerTest::CurrentView()->Window()->SetTitle (TCollection_AsciiString ("3D View - ") + ViewerTest_myViews.Find2 (ViewerTest::CurrentView()));
      VT_GetWindow().Nullify();
      ViewerTest::CurrentView (Handle(V3d_View)());
      ViewerTest::ResetEventManager();
      theDi << theArgVec[0] << ": all views are inactive\n";
      toActivate = Standard_False;
    }
    else if (toActivate
          && aNameString.IsEmpty())
    {
      aNameString = theArgVec[anArgIter];
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }

  if (!toActivate)
  {
    return 0;
  }
  else if (aNameString.IsEmpty())
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }

  // Check if this view exists in the viewer with the driver
  ViewerTest_Names aViewNames (aNameString);
  if (!ViewerTest_myViews.IsBound1(aViewNames.GetViewName()))
  {
    theDi << "Syntax error: wrong view name '" << aNameString << "'\n";
    return 1;
  }

  // Check if it is active already
  if (ViewerTest::CurrentView() == ViewerTest_myViews.Find1(aViewNames.GetViewName()))
  {
    theDi << theArgVec[0] << ": the view is active already\n";
    return 0;
  }

  ActivateView (aViewNames.GetViewName(), toUpdate);
  return 0;
}

//==============================================================================
//function : VViewList
//purpose  : Print current list of views per viewer and graphic driver ID
//           shared between viewers
//==============================================================================

static int VViewList (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  if (theArgsNb > 2)
  {
    theDi << theArgVec[0] << ": Wrong number of command arguments\n"
          << "Usage: " << theArgVec[0] << " name";
    return 1;
  }
  if (ViewerTest_myContexts.Size() < 1)
    return 0;

  Standard_Boolean isTreeView =
    (( theArgsNb==1 ) || ( strcasecmp( theArgVec[1], "long" ) != 0 ));

  if (isTreeView)
  {
    theDi << theArgVec[0] <<":\n";
  }

  for (NCollection_DoubleMap <TCollection_AsciiString, Handle(Graphic3d_GraphicDriver)>::Iterator aDriverIter (ViewerTest_myDrivers);
       aDriverIter.More(); aDriverIter.Next())
  {
    if (isTreeView)
      theDi << aDriverIter.Key1() << ":\n";

    for (NCollection_DoubleMap <TCollection_AsciiString, Handle(AIS_InteractiveContext)>::Iterator
      aContextIter(ViewerTest_myContexts); aContextIter.More(); aContextIter.Next())
    {
      if (aContextIter.Key1().Search(aDriverIter.Key1()) != -1)
      {
        if (isTreeView)
        {
          TCollection_AsciiString aContextName(aContextIter.Key1());
          theDi << " " << aContextName.Split(aDriverIter.Key1().Length() + 1) << ":\n";
        }

        for (NCollection_DoubleMap <TCollection_AsciiString, Handle(V3d_View)>::Iterator aViewIter (ViewerTest_myViews);
             aViewIter.More(); aViewIter.Next())
        {
          if (aViewIter.Key1().Search(aContextIter.Key1()) != -1)
          {
            TCollection_AsciiString aViewName(aViewIter.Key1());
            if (isTreeView)
            {
              if (aViewIter.Value() == ViewerTest::CurrentView())
                theDi << "  " << aViewName.Split(aContextIter.Key1().Length() + 1) << "(*)\n";
              else
                theDi << "  " << aViewName.Split(aContextIter.Key1().Length() + 1) << "\n";
            }
            else
            {
              theDi << aViewName << " ";
            }
          }
        }
      }
    }
  }
  return 0;
}

//==============================================================================
//function : GetMousePosition
//purpose  :
//==============================================================================
void ViewerTest::GetMousePosition (Standard_Integer& theX,
                                   Standard_Integer& theY)
{
  if (Handle(ViewerTest_EventManager) aViewCtrl = ViewerTest::CurrentEventManager())
  {
    theX = aViewCtrl->LastMousePosition().x();
    theY = aViewCtrl->LastMousePosition().y();
  }
}

//==============================================================================
//function : VViewProj
//purpose  : Switch view projection
//==============================================================================
static int VViewProj (Draw_Interpretor& ,
                      Standard_Integer theNbArgs,
                      const char** theArgVec)
{
  static Standard_Boolean isYup = Standard_False;
  const Handle(V3d_View)& aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  TCollection_AsciiString aCmdName (theArgVec[0]);
  Standard_Boolean isGeneralCmd = Standard_False;
  if (aCmdName == "vfront")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Front : V3d_TypeOfOrientation_Zup_Front, isYup);
  }
  else if (aCmdName == "vback")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Back : V3d_TypeOfOrientation_Zup_Back, isYup);
  }
  else if (aCmdName == "vtop")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Top : V3d_TypeOfOrientation_Zup_Top, isYup);
  }
  else if (aCmdName == "vbottom")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Bottom : V3d_TypeOfOrientation_Zup_Bottom, isYup);
  }
  else if (aCmdName == "vleft")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Left : V3d_TypeOfOrientation_Zup_Left, isYup);
  }
  else if (aCmdName == "vright")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Right : V3d_TypeOfOrientation_Zup_Right, isYup);
  }
  else if (aCmdName == "vaxo")
  {
    aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_AxoRight : V3d_TypeOfOrientation_Zup_AxoRight, isYup);
  }
  else
  {
    isGeneralCmd = Standard_True;
    for (Standard_Integer anArgIter = 1; anArgIter < theNbArgs; ++anArgIter)
    {
      TCollection_AsciiString anArgCase (theArgVec[anArgIter]);
      anArgCase.LowerCase();
      if (anArgCase == "-zup")
      {
        isYup = Standard_False;
      }
      else if (anArgCase == "-yup")
      {
        isYup = Standard_True;
      }
      else if (anArgCase == "-front"
            || anArgCase == "front"
            || anArgCase == "-f"
            || anArgCase == "f")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Front : V3d_TypeOfOrientation_Zup_Front, isYup);
      }
      else if (anArgCase == "-back"
            || anArgCase == "back"
            || anArgCase == "-b"
            || anArgCase == "b")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Back : V3d_TypeOfOrientation_Zup_Back, isYup);
      }
      else if (anArgCase == "-top"
            || anArgCase == "top"
            || anArgCase == "-t"
            || anArgCase == "t")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Top : V3d_TypeOfOrientation_Zup_Top, isYup);
      }
      else if (anArgCase == "-bottom"
            || anArgCase == "bottom"
            || anArgCase == "-bot"
            || anArgCase == "bot"
            || anArgCase == "-b"
            || anArgCase == "b")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Bottom : V3d_TypeOfOrientation_Zup_Bottom, isYup);
      }
      else if (anArgCase == "-left"
            || anArgCase == "left"
            || anArgCase == "-l"
            || anArgCase == "l")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Left : V3d_TypeOfOrientation_Zup_Left, isYup);
      }
      else if (anArgCase == "-right"
            || anArgCase == "right"
            || anArgCase == "-r"
            || anArgCase == "r")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_Right : V3d_TypeOfOrientation_Zup_Right, isYup);
      }
      else if (anArgCase == "-axoleft"
            || anArgCase == "-leftaxo"
            || anArgCase == "axoleft"
            || anArgCase == "leftaxo")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_AxoLeft : V3d_TypeOfOrientation_Zup_AxoLeft, isYup);
      }
      else if (anArgCase == "-axo"
            || anArgCase == "axo"
            || anArgCase == "-a"
            || anArgCase == "a"
            || anArgCase == "-axoright"
            || anArgCase == "-rightaxo"
            || anArgCase == "axoright"
            || anArgCase == "rightaxo")
      {
        aView->SetProj (isYup ? V3d_TypeOfOrientation_Yup_AxoRight : V3d_TypeOfOrientation_Zup_AxoRight, isYup);
      }
      else if (anArgCase == "+x")
      {
        aView->SetProj (V3d_Xpos, isYup);
      }
      else if (anArgCase == "-x")
      {
        aView->SetProj (V3d_Xneg, isYup);
      }
      else if (anArgCase == "+y")
      {
        aView->SetProj (V3d_Ypos, isYup);
      }
      else if (anArgCase == "-y")
      {
        aView->SetProj (V3d_Yneg, isYup);
      }
      else if (anArgCase == "+z")
      {
        aView->SetProj (V3d_Zpos, isYup);
      }
      else if (anArgCase == "-z")
      {
        aView->SetProj (V3d_Zneg, isYup);
      }
      else if (anArgCase == "+x+y+z")
      {
        aView->SetProj (V3d_XposYposZpos, isYup);
      }
      else if (anArgCase == "+x+y-z")
      {
        aView->SetProj (V3d_XposYposZneg, isYup);
      }
      else if (anArgCase == "+x-y+z")
      {
        aView->SetProj (V3d_XposYnegZpos, isYup);
      }
      else if (anArgCase == "+x-y-z")
      {
        aView->SetProj (V3d_XposYnegZneg, isYup);
      }
      else if (anArgCase == "-x+y+z")
      {
        aView->SetProj (V3d_XnegYposZpos, isYup);
      }
      else if (anArgCase == "-x+y-z")
      {
        aView->SetProj (V3d_XnegYposZneg, isYup);
      }
      else if (anArgCase == "-x-y+z")
      {
        aView->SetProj (V3d_XnegYnegZpos, isYup);
      }
      else if (anArgCase == "-x-y-z")
      {
        aView->SetProj (V3d_XnegYnegZneg, isYup);
      }
      else if (anArgCase == "+x+y")
      {
        aView->SetProj (V3d_XposYpos, isYup);
      }
      else if (anArgCase == "+x-y")
      {
        aView->SetProj (V3d_XposYneg, isYup);
      }
      else if (anArgCase == "-x+y")
      {
        aView->SetProj (V3d_XnegYpos, isYup);
      }
      else if (anArgCase == "-x-y")
      {
        aView->SetProj (V3d_XnegYneg, isYup);
      }
      else if (anArgCase == "+x+z")
      {
        aView->SetProj (V3d_XposZpos, isYup);
      }
      else if (anArgCase == "+x-z")
      {
        aView->SetProj (V3d_XposZneg, isYup);
      }
      else if (anArgCase == "-x+z")
      {
        aView->SetProj (V3d_XnegZpos, isYup);
      }
      else if (anArgCase == "-x-z")
      {
        aView->SetProj (V3d_XnegZneg, isYup);
      }
      else if (anArgCase == "+y+z")
      {
        aView->SetProj (V3d_YposZpos, isYup);
      }
      else if (anArgCase == "+y-z")
      {
        aView->SetProj (V3d_YposZneg, isYup);
      }
      else if (anArgCase == "-y+z")
      {
        aView->SetProj (V3d_YnegZpos, isYup);
      }
      else if (anArgCase == "-y-z")
      {
        aView->SetProj (V3d_YnegZneg, isYup);
      }
      else if (anArgIter + 1 < theNbArgs
            && anArgCase == "-frame"
            && TCollection_AsciiString (theArgVec[anArgIter + 1]).Length() == 4)
      {
        TCollection_AsciiString aFrameDef (theArgVec[++anArgIter]);
        aFrameDef.LowerCase();
        gp_Dir aRight, anUp;
        if (aFrameDef.Value (2) == aFrameDef.Value (4))
        {
          Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
          return 1;
        }

        if (aFrameDef.Value (2) == 'x')
        {
          aRight = aFrameDef.Value (1) == '+' ? gp::DX() : -gp::DX();
        }
        else if (aFrameDef.Value (2) == 'y')
        {
          aRight = aFrameDef.Value (1) == '+' ? gp::DY() : -gp::DY();
        }
        else if (aFrameDef.Value (2) == 'z')
        {
          aRight = aFrameDef.Value (1) == '+' ? gp::DZ() : -gp::DZ();
        }
        else
        {
          Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
          return 1;
        }

        if (aFrameDef.Value (4) == 'x')
        {
          anUp = aFrameDef.Value (3) == '+' ? gp::DX() : -gp::DX();
        }
        else if (aFrameDef.Value (4) == 'y')
        {
          anUp = aFrameDef.Value (3) == '+' ? gp::DY() : -gp::DY();
        }
        else if (aFrameDef.Value (4) == 'z')
        {
          anUp = aFrameDef.Value (3) == '+' ? gp::DZ() : -gp::DZ();
        }
        else
        {
          Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
          return 1;
        }

        const Handle(Graphic3d_Camera)& aCamera = aView->Camera();
        const gp_Pnt anOriginVCS = aCamera->ConvertWorld2View (gp::Origin());
        const gp_Dir aDir = anUp.Crossed (aRight);
        aCamera->SetCenter (gp_Pnt (0, 0, 0));
        aCamera->SetDirection (aDir);
        aCamera->SetUp (anUp);
        aCamera->OrthogonalizeUp();

        aView->Panning (anOriginVCS.X(), anOriginVCS.Y());
        aView->Update();
      }
      else
      {
        Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
  }

  if (!isGeneralCmd
    && theNbArgs != 1)
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }
  return 0;
}

//==============================================================================
//function : VHelp
//purpose  : Dsiplay help on viewer Keyboead and mouse commands
//Draw arg : No args
//==============================================================================

static int VHelp(Draw_Interpretor& di, Standard_Integer , const char** )
{
  di << "=========================\n";
  di << "F : FitAll\n";
  di << "T : TopView\n";
  di << "B : BottomView\n";
  di << "R : RightView\n";
  di << "L : LeftView\n";
  di << "Backspace : AxonometricView\n";

  di << "=========================\n";
  di << "W, S : Fly   forward/backward\n";
  di << "A, D : Slide left/right\n";
  di << "Q, E : Bank  left/right\n";
  di << "-, + : Change flying speed\n";
  di << "Arrows : look left/right/up/down\n";
  di << "Arrows+Shift : slide left/right/up/down\n";

  di << "=========================\n";
  di << "S + Ctrl : Shading\n";
  di << "W + Ctrl : Wireframe\n";
  di << "H : HiddenLineRemoval\n";
  di << "U : Unset display mode\n";
  di << "Delete : Remove selection from viewer\n";

  di << "=========================\n";
  di << "Selection mode \n";
  di << "0 : Shape\n";
  di << "1 : Vertex\n";
  di << "2 : Edge\n";
  di << "3 : Wire\n";
  di << "4 : Face\n";
  di << "5 : Shell\n";
  di << "6 : Solid\n";
  di << "7 : Compound\n";

  di << "=========================\n";
  di << "< : Hilight next detected\n";
  di << "> : Hilight previous detected\n";

  return 0;
}

#ifdef _WIN32

static LRESULT WINAPI AdvViewerWindowProc (HWND theWinHandle,
                                           UINT theMsg,
                                           WPARAM wParam,
                                           LPARAM lParam )
{
  if (ViewerTest_myViews.IsEmpty())
  {
    return DefWindowProcW (theWinHandle, theMsg, wParam, lParam);
  }

  switch (theMsg)
  {
    case WM_CLOSE:
    {
      // Delete view from map of views
      ViewerTest::RemoveView (FindViewIdByWindowHandle (theWinHandle));
      return 0;
    }
    case WM_ACTIVATE:
    {
      if (LOWORD(wParam) == WA_CLICKACTIVE
       || LOWORD(wParam) == WA_ACTIVE
       || ViewerTest::CurrentView().IsNull())
      {
        // Activate inactive window
        if (VT_GetWindow().IsNull()
         || (HWND )VT_GetWindow()->HWindow() != theWinHandle)
        {
          ActivateView (FindViewIdByWindowHandle (theWinHandle));
        }
      }
      return 0;
    }
    case WM_LBUTTONDOWN:
    {
      TheIsAnimating = Standard_False;
    }
    Standard_FALLTHROUGH
    default:
    {
      const Handle(V3d_View)& aView = ViewerTest::CurrentView();
      if (!aView.IsNull()
       && !VT_GetWindow().IsNull())
      {
        MSG aMsg = {};
        aMsg.hwnd = theWinHandle;
        aMsg.message = theMsg;
        aMsg.wParam = wParam;
        aMsg.lParam = lParam;
        if (VT_GetWindow()->ProcessMessage (*ViewerTest::CurrentEventManager(), aMsg))
        {
          return 0;
        }
      }
    }
  }
  return DefWindowProcW (theWinHandle, theMsg, wParam, lParam);
}

//==============================================================================
//function : ViewerMainLoop
//purpose  : Get a Event on the view and dispatch it
//==============================================================================

int ViewerMainLoop (Standard_Integer theNbArgs, const char** theArgVec)
{
  Handle(ViewerTest_EventManager) aViewCtrl = ViewerTest::CurrentEventManager();
  if (aViewCtrl.IsNull()
   || theNbArgs < 4)
  {
    return 0;
  }

  aViewCtrl->StartPickPoint (theArgVec[1], theArgVec[2], theArgVec[3]);

  std::cout << "Start picking\n";

  MSG aMsg;
  aMsg.wParam = 1;
  while (aViewCtrl->ToPickPoint())
  {
    // Wait for a VT_ProcessButton1Press() to toggle pick to 1 or 0
    if (GetMessageW (&aMsg, NULL, 0, 0))
    {
      TranslateMessage (&aMsg);
      DispatchMessageW (&aMsg);
    }
  }

  std::cout << "Picking done\n";
  return 0;
}

#elif defined(HAVE_XLIB)

int ViewerMainLoop (Standard_Integer theNbArgs, const char** theArgVec)
{
  static XEvent aReport;
  const Standard_Boolean toPick = theNbArgs > 0;
  if (theNbArgs > 0)
  {
    if (ViewerTest::CurrentEventManager().IsNull())
    {
      return 0;
    }
    ViewerTest::CurrentEventManager()->StartPickPoint (theArgVec[1], theArgVec[2], theArgVec[3]);
  }

  Display* aDisplay = (Display* )GetDisplayConnection()->GetDisplayAspect();
  XNextEvent (aDisplay, &aReport);

  // Handle event for the chosen display connection
  switch (aReport.type)
  {
    case ClientMessage:
    {
      if ((Atom)aReport.xclient.data.l[0] == GetDisplayConnection()->GetAtom(Aspect_XA_DELETE_WINDOW))
      {
        // Close the window
        ViewerTest::RemoveView(FindViewIdByWindowHandle (aReport.xclient.window));
        return toPick ? 0 : 1;
      }
      break;
    }
    case FocusIn:
    {
      // Activate inactive view
      Window aWindow = !VT_GetWindow().IsNull() ? VT_GetWindow()->XWindow() : 0;
      if (aWindow != aReport.xfocus.window)
      {
        ActivateView (FindViewIdByWindowHandle (aReport.xfocus.window));
      }
      break;
    }
    case ButtonPress:
    {
      if (aReport.xbutton.button == Button1)
      {
        TheIsAnimating = Standard_False;
      }
    }
    Standard_FALLTHROUGH
    default:
    {
      const Handle(V3d_View)& aView = ViewerTest::CurrentView();
      if (!aView.IsNull()
       && !VT_GetWindow().IsNull())
      {
        VT_GetWindow()->ProcessMessage (*ViewerTest::CurrentEventManager(), aReport);
      }
      break;
    }
  }
  return (!toPick || ViewerTest::CurrentEventManager()->ToPickPoint()) ? 1 : 0;
}

//==============================================================================
//function : VProcessEvents
//purpose  : manage the event in the Viewer window (see Tcl_CreateFileHandler())
//==============================================================================
static void VProcessEvents (ClientData theDispX, int)
{
  Display* aDispX = (Display* )theDispX;
  Handle(Aspect_DisplayConnection) aDispConn;
  for (NCollection_DoubleMap<TCollection_AsciiString, Handle(Graphic3d_GraphicDriver)>::Iterator
       aDriverIter (ViewerTest_myDrivers); aDriverIter.More(); aDriverIter.Next())
  {
    const Handle(Aspect_DisplayConnection)& aDispConnTmp = aDriverIter.Key2()->GetDisplayConnection();
    if ((Display* )aDispConnTmp->GetDisplayAspect() == aDispX)
    {
      aDispConn = aDispConnTmp;
      break;
    }
  }
  if (aDispConn.IsNull())
  {
    Message::SendFail ("Error: ViewerTest is unable processing messages for unknown X Display");
    return;
  }

  // process new events in queue
  SetDisplayConnection (aDispConn);
  int aNbRemain = 0;
  for (int aNbEventsMax = XPending (aDispX), anEventIter (0);;)
  {
    const int anEventResult = ViewerMainLoop (0, NULL);
    if (anEventResult == 0)
    {
      return;
    }

    aNbRemain = XPending (aDispX);
    if (++anEventIter >= aNbEventsMax
     || aNbRemain <= 0)
    {
      break;
    }
  }

  // Listening X events through Tcl_CreateFileHandler() callback is fragile,
  // it is possible that new events will arrive to queue before the end of this callback
  // so that either this callback should go into an infinite loop (blocking processing of other events)
  // or to keep unprocessed events till the next queue update (which can arrive not soon).
  // Sending a dummy event in this case is a simple workaround (still, it is possible that new event will be queued in-between).
  if (aNbRemain != 0)
  {
    XEvent aDummyEvent;
    memset (&aDummyEvent, 0, sizeof(aDummyEvent));
    aDummyEvent.type = ClientMessage;
    aDummyEvent.xclient.format = 32;
    XSendEvent (aDispX, InputFocus, False, 0, &aDummyEvent);
    XFlush (aDispX);
  }

  if (const Handle(AIS_InteractiveContext)& anActiveCtx = ViewerTest::GetAISContext())
  {
    SetDisplayConnection (anActiveCtx->CurrentViewer()->Driver()->GetDisplayConnection());
  }
}
#elif !defined(__APPLE__)
// =======================================================================
// function : ViewerMainLoop
// purpose  :
// =======================================================================
int ViewerMainLoop (Standard_Integer , const char** )
{
  // unused
  return 0;
}
#endif

//==============================================================================
//function : VFit
//purpose  :
//==============================================================================

static int VFit (Draw_Interpretor& /*theDi*/, Standard_Integer theArgNb, const char** theArgv)
{
  const Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean toFit = Standard_True;
  ViewerTest_AutoUpdater anUpdateTool (Handle(AIS_InteractiveContext)(), aView);
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgv[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      continue;
    }
    else if (anArg == "-selected")
    {
      ViewerTest::GetAISContext()->FitSelected (aView, 0.01, Standard_False);
      toFit = Standard_False;
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
    }
  }

  if (toFit)
  {
    aView->FitAll (0.01, Standard_False);
  }
  return 0;
}

//=======================================================================
//function : VFitArea
//purpose  : Fit view to show area located between two points
//         : given in world 2D or 3D coordinates.
//=======================================================================
static int VFitArea (Draw_Interpretor& theDI, Standard_Integer  theArgNb, const char** theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: No active viewer");
    return 1;
  }

  // Parse arguments.
  gp_Pnt aWorldPnt1 (0.0, 0.0, 0.0);
  gp_Pnt aWorldPnt2 (0.0, 0.0, 0.0);

  if (theArgNb == 5)
  {
    aWorldPnt1.SetX (Draw::Atof (theArgVec[1]));
    aWorldPnt1.SetY (Draw::Atof (theArgVec[2]));
    aWorldPnt2.SetX (Draw::Atof (theArgVec[3]));
    aWorldPnt2.SetY (Draw::Atof (theArgVec[4]));
  }
  else if (theArgNb == 7)
  {
    aWorldPnt1.SetX (Draw::Atof (theArgVec[1]));
    aWorldPnt1.SetY (Draw::Atof (theArgVec[2]));
    aWorldPnt1.SetZ (Draw::Atof (theArgVec[3]));
    aWorldPnt2.SetX (Draw::Atof (theArgVec[4]));
    aWorldPnt2.SetY (Draw::Atof (theArgVec[5]));
    aWorldPnt2.SetZ (Draw::Atof (theArgVec[6]));
  }
  else
  {
    Message::SendFail ("Syntax error: Invalid number of arguments");
    theDI.PrintHelp(theArgVec[0]);
    return 1;
  }

  // Convert model coordinates to view space
  Handle(Graphic3d_Camera) aCamera = aView->Camera();
  gp_Pnt aViewPnt1 = aCamera->ConvertWorld2View (aWorldPnt1);
  gp_Pnt aViewPnt2 = aCamera->ConvertWorld2View (aWorldPnt2);

  // Determine fit area
  gp_Pnt2d aMinCorner (Min (aViewPnt1.X(), aViewPnt2.X()), Min (aViewPnt1.Y(), aViewPnt2.Y()));
  gp_Pnt2d aMaxCorner (Max (aViewPnt1.X(), aViewPnt2.X()), Max (aViewPnt1.Y(), aViewPnt2.Y()));

  Standard_Real aDiagonal = aMinCorner.Distance (aMaxCorner);

  if (aDiagonal < Precision::Confusion())
  {
    Message::SendFail ("Error: view area is too small");
    return 1;
  }

  aView->FitAll (aMinCorner.X(), aMinCorner.Y(), aMaxCorner.X(), aMaxCorner.Y());
  return 0;
}

//==============================================================================
//function : VZFit
//purpose  : ZFitall, no DRAW arguments
//Draw arg : No args
//==============================================================================
static int VZFit (Draw_Interpretor& /*theDi*/, Standard_Integer theArgsNb, const char** theArgVec)
{
  const Handle(V3d_View)& aCurrentView = ViewerTest::CurrentView();

  if (aCurrentView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  if (theArgsNb == 1)
  {
    aCurrentView->ZFitAll();
    aCurrentView->Redraw();
    return 0;
  }

  Standard_Real aScale = 1.0;

  if (theArgsNb >= 2)
  {
    aScale = Draw::Atoi (theArgVec[1]);
  }

  aCurrentView->ZFitAll (aScale);
  aCurrentView->Redraw();

  return 0;
}

//==============================================================================
//function : VRepaint
//purpose  :
//==============================================================================
static int VRepaint (Draw_Interpretor& , Standard_Integer theArgNb, const char** theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean isImmediateUpdate = Standard_False;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anArg == "-immediate"
     || anArg == "-imm")
    {
      isImmediateUpdate = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], isImmediateUpdate))
      {
        ++anArgIter;
      }
    }
    else if (anArg == "-continuous"
          || anArg == "-cont"
          || anArg == "-fps"
          || anArg == "-framerate")
    {
      Standard_Real aFps = -1.0;
      if (anArgIter + 1 < theArgNb
       && TCollection_AsciiString (theArgVec[anArgIter + 1]).IsRealValue (Standard_True))
      {
        aFps = Draw::Atof (theArgVec[++anArgIter]);
      }

      ViewerTest_ContinuousRedrawer& aRedrawer = ViewerTest_ContinuousRedrawer::Instance();
      if (Abs (aFps) >= 1.0)
      {
        aRedrawer.Start (aView->Window(), aFps);
      }
      else
      {
        aRedrawer.Stop();
      }
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
      return 1;
    }
  }

  if (isImmediateUpdate)
  {
    aView->RedrawImmediate();
  }
  else
  {
    aView->Redraw();
  }
  return 0;
}

//==============================================================================
//function : VClear
//purpose  : Remove all the object from the viewer
//Draw arg : No args
//==============================================================================

static int VClear(Draw_Interpretor& , Standard_Integer , const char** )
{
  Handle(V3d_View) V = ViewerTest::CurrentView();
  if(!V.IsNull())
    ViewerTest::Clear();
  return 0;
}

//==============================================================================
//function : VPick
//purpose  :
//==============================================================================

static int VPick (Draw_Interpretor& ,
                  Standard_Integer theNbArgs,
                  const char** theArgVec)
{
  if (ViewerTest::CurrentView().IsNull())
  {
    return 1;
  }

  if (theNbArgs < 4)
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }

  while (ViewerMainLoop (theNbArgs, theArgVec))
  {
    //
  }

  return 0;
}

namespace
{

  //! Changes the background
  //! @param theDrawInterpretor the interpreter of the Draw Harness application
  //! @param theNumberOfCommandLineArguments the number of passed command line arguments
  //! @param theCommandLineArguments the array of command line arguments
  //! @return TCL_OK if changing was successful, or TCL_ERROR otherwise
  static int vbackground (Draw_Interpretor&      theDrawInterpretor,
                          const Standard_Integer theNumberOfCommandLineArguments,
                          const char** const     theCommandLineArguments)
  {
    if (theNumberOfCommandLineArguments < 1)
    {
      return TCL_ERROR;
    }
    BackgroundChanger aBackgroundChanger;
    if (!aBackgroundChanger.ProcessCommandLine (theDrawInterpretor,
                                                theNumberOfCommandLineArguments,
                                                theCommandLineArguments))
    {
      theDrawInterpretor << "Wrong command arguments.\n"
                            "Type 'help "
                         << theCommandLineArguments[0] << "' for information about command options and its arguments.\n";
      return TCL_ERROR;
    }
    return TCL_OK;
  }

} // namespace

//==============================================================================
//function : VScale
//purpose  : View Scaling
//==============================================================================

static int VScale(Draw_Interpretor& di, Standard_Integer argc, const char** argv)
{
  Handle(V3d_View) V3dView = ViewerTest::CurrentView();
  if ( V3dView.IsNull() ) return 1;

  if ( argc != 4 ) {
    di << argv[0] << "Invalid number of arguments\n";
    return 1;
  }
  V3dView->SetAxialScale( Draw::Atof(argv[1]),  Draw::Atof(argv[2]),  Draw::Atof(argv[3]) );
  return 0;
}
//==============================================================================
//function : VZBuffTrihedron
//purpose  :
//==============================================================================

static int VZBuffTrihedron (Draw_Interpretor& /*theDI*/,
                            Standard_Integer  theArgNb,
                            const char**      theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  ViewerTest_AutoUpdater anUpdateTool (ViewerTest::GetAISContext(), aView);

  Aspect_TypeOfTriedronPosition aPosition     = Aspect_TOTP_LEFT_LOWER;
  V3d_TypeOfVisualization       aVisType      = V3d_ZBUFFER;
  Quantity_Color                aLabelsColorX = Quantity_NOC_WHITE;
  Quantity_Color                aLabelsColorY = Quantity_NOC_WHITE;
  Quantity_Color                aLabelsColorZ = Quantity_NOC_WHITE;
  Quantity_Color                anArrowColorX = Quantity_NOC_RED;
  Quantity_Color                anArrowColorY = Quantity_NOC_GREEN;
  Quantity_Color                anArrowColorZ = Quantity_NOC_BLUE1;
  Standard_Real                 aScale        = 0.1;
  Standard_Real                 aSizeRatio    = 0.8;
  Standard_Real                 anArrowDiam   = 0.05;
  Standard_Integer              aNbFacets     = 12;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    Standard_CString        anArg = theArgVec[anArgIter];
    TCollection_AsciiString aFlag (anArg);
    aFlag.LowerCase();
    if (anUpdateTool.parseRedrawMode (aFlag))
    {
      continue;
    }
    else if (aFlag == "-on")
    {
      continue;
    }
    else if (aFlag == "-off")
    {
      aView->TriedronErase();
      return 0;
    }
    else if (aFlag == "-pos"
          || aFlag == "-position"
          || aFlag == "-corner")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aPosName (theArgVec[anArgIter]);
      aPosName.LowerCase();
      if (aPosName == "center")
      {
        aPosition = Aspect_TOTP_CENTER;
      }
      else if (aPosName == "left_lower"
            || aPosName == "lower_left"
            || aPosName == "leftlower"
            || aPosName == "lowerleft")
      {
        aPosition = Aspect_TOTP_LEFT_LOWER;
      }
      else if (aPosName == "left_upper"
            || aPosName == "upper_left"
            || aPosName == "leftupper"
            || aPosName == "upperleft")
      {
        aPosition = Aspect_TOTP_LEFT_UPPER;
      }
      else if (aPosName == "right_lower"
            || aPosName == "lower_right"
            || aPosName == "rightlower"
            || aPosName == "lowerright")
      {
        aPosition = Aspect_TOTP_RIGHT_LOWER;
      }
      else if (aPosName == "right_upper"
            || aPosName == "upper_right"
            || aPosName == "rightupper"
            || aPosName == "upperright")
      {
        aPosition = Aspect_TOTP_RIGHT_UPPER;
      }
      else
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "' - unknown position '" << aPosName << "'";
        return 1;
      }
    }
    else if (aFlag == "-type")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aTypeName (theArgVec[anArgIter]);
      aTypeName.LowerCase();
      if (aTypeName == "wireframe"
       || aTypeName == "wire")
      {
        aVisType = V3d_WIREFRAME;
      }
      else if (aTypeName == "zbuffer"
            || aTypeName == "shaded")
      {
        aVisType = V3d_ZBUFFER;
      }
      else
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "' - unknown type '" << aTypeName << "'";
      }
    }
    else if (aFlag == "-scale")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      aScale = Draw::Atof (theArgVec[anArgIter]);
    }
    else if (aFlag == "-size"
          || aFlag == "-sizeratio")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      aSizeRatio = Draw::Atof (theArgVec[anArgIter]);
    }
    else if (aFlag == "-arrowdiam"
          || aFlag == "-arrowdiameter")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      anArrowDiam = Draw::Atof (theArgVec[anArgIter]);
    }
    else if (aFlag == "-nbfacets")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      aNbFacets = Draw::Atoi (theArgVec[anArgIter]);
    }
    else if (aFlag == "-colorlabel"
          || aFlag == "-colorlabels"
          || aFlag == "-colorlabelx"
          || aFlag == "-colorlabely"
          || aFlag == "-colorlabelz"
          || aFlag == "-colorarrowx"
          || aFlag == "-colorarrowy"
          || aFlag == "-colorarrowz")
    {
      Quantity_Color aColor;
      Standard_Integer aNbParsed = Draw::ParseColor (theArgNb  - anArgIter - 1,
                                                     theArgVec + anArgIter + 1,
                                                     aColor);
      if (aNbParsed == 0)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      if (aFlag == "-colorarrowx")
      {
        anArrowColorX = aColor;
      }
      else if (aFlag == "-colorarrowy")
      {
        anArrowColorY = aColor;
      }
      else if (aFlag == "-colorarrowz")
      {
        anArrowColorZ = aColor;
      }
      else if (aFlag == "-colorlabelx")
      {
        aLabelsColorX = aColor;
      }
      else if (aFlag == "-colorlabely")
      {
        aLabelsColorY = aColor;
      }
      else if (aFlag == "-colorlabelz")
      {
        aLabelsColorZ = aColor;
      }
      else
      {
        aLabelsColorZ = aLabelsColorY = aLabelsColorX = aColor;
      }
      anArgIter += aNbParsed;
    }
    else
    {
      Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
      return 1;
    }
  }

  const Handle(V3d_Trihedron)& aTrihedron = aView->Trihedron();
  aTrihedron->SetArrowsColor  (anArrowColorX, anArrowColorY, anArrowColorZ);
  aTrihedron->SetLabelsColor  (aLabelsColorX, aLabelsColorY, aLabelsColorZ);
  aTrihedron->SetSizeRatio    (aSizeRatio);
  aTrihedron->SetNbFacets     (aNbFacets);
  aTrihedron->SetArrowDiameter(anArrowDiam);
  aTrihedron->SetScale        (aScale);
  aTrihedron->SetPosition     (aPosition);
  aTrihedron->SetWireframe    (aVisType == V3d_WIREFRAME);
  aTrihedron->Display (aView);

  aView->ZFitAll();
  return 0;
}

//==============================================================================
//function : VRotate
//purpose  : Camera Rotating
//==============================================================================

static int VRotate (Draw_Interpretor& /*theDi*/, Standard_Integer theArgNb, const char** theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean hasFlags = Standard_False;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    Standard_CString        anArg (theArgVec[anArgIter]);
    TCollection_AsciiString aFlag (anArg);
    aFlag.LowerCase();
    if (aFlag == "-mousestart"
     || aFlag == "-mousefrom")
    {
      hasFlags = Standard_True;
      if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      Standard_Integer anX = Draw::Atoi (theArgVec[++anArgIter]);
      Standard_Integer anY = Draw::Atoi (theArgVec[++anArgIter]);
      aView->StartRotation (anX, anY);
    }
    else if (aFlag == "-mousemove")
    {
      hasFlags = Standard_True;
      if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      Standard_Integer anX = Draw::Atoi (theArgVec[++anArgIter]);
      Standard_Integer anY = Draw::Atoi (theArgVec[++anArgIter]);
      aView->Rotation (anX, anY);
    }
    else if (theArgNb != 4
          && theArgNb != 7)
    {
      Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
      return 1;
    }
  }

  if (hasFlags)
  {
    return 0;
  }
  else if (theArgNb == 4)
  {
    Standard_Real anAX = Draw::Atof (theArgVec[1]);
    Standard_Real anAY = Draw::Atof (theArgVec[2]);
    Standard_Real anAZ = Draw::Atof (theArgVec[3]);
    aView->Rotate (anAX, anAY, anAZ);
    return 0;
  }
  else if (theArgNb == 7)
  {
    Standard_Real anAX = Draw::Atof (theArgVec[1]);
    Standard_Real anAY = Draw::Atof (theArgVec[2]);
    Standard_Real anAZ = Draw::Atof (theArgVec[3]);

    Standard_Real anX = Draw::Atof (theArgVec[4]);
    Standard_Real anY = Draw::Atof (theArgVec[5]);
    Standard_Real anZ = Draw::Atof (theArgVec[6]);

    aView->Rotate (anAX, anAY, anAZ, anX, anY, anZ);
    return 0;
  }

  Message::SendFail ("Error: Invalid number of arguments");
  return 1;
}

//==============================================================================
//function : VZoom
//purpose  : View zoom in / out (relative to current zoom)
//==============================================================================

static int VZoom( Draw_Interpretor& di, Standard_Integer argc, const char** argv ) {
  Handle(V3d_View) V3dView = ViewerTest::CurrentView();
  if ( V3dView.IsNull() ) {
    return 1;
  }

  if ( argc == 2 ) {
    Standard_Real coef = Draw::Atof(argv[1]);
    if ( coef <= 0.0 ) {
      di << argv[1] << "Invalid value\n";
      return 1;
    }
    V3dView->SetZoom( Draw::Atof(argv[1]) );
    return 0;
  } else {
    di << argv[0] << " Invalid number of arguments\n";
    return 1;
  }
}

//==============================================================================
//function : VPan
//purpose  : View panning (in pixels)
//==============================================================================

static int VPan( Draw_Interpretor& di, Standard_Integer argc, const char** argv ) {
  Handle(V3d_View) V3dView = ViewerTest::CurrentView();
  if ( V3dView.IsNull() ) return 1;

  if ( argc == 3 ) {
    V3dView->Pan( Draw::Atoi(argv[1]), Draw::Atoi(argv[2]) );
    return 0;
  } else {
    di << argv[0] << " Invalid number of arguments\n";
    return 1;
  }
}

//==============================================================================
//function : VPlace
//purpose  : Place the point (in pixels) at the center of the window
//==============================================================================
static int VPlace (Draw_Interpretor& /*theDi*/, Standard_Integer theArgNb, const char** theArgs)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  if (theArgNb != 3)
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }

  aView->Place (Draw::Atoi (theArgs[1]), Draw::Atoi (theArgs[2]), aView->Scale());

  return 0;
}

static int VColorScale (Draw_Interpretor& theDI,
                        Standard_Integer  theArgNb,
                        const char**      theArgVec)
{
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  Handle(V3d_View)               aView    = ViewerTest::CurrentView();
  if (aContext.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }
  if (theArgNb <= 1)
  {
    Message::SendFail() << "Error: wrong syntax at command '" << theArgVec[0] << "'";
    return 1;
  }

  Handle(AIS_ColorScale) aColorScale;
  if (GetMapOfAIS().IsBound2 (theArgVec[1]))
  {
    // find existing object
    aColorScale = Handle(AIS_ColorScale)::DownCast (GetMapOfAIS().Find2 (theArgVec[1]));
    if (aColorScale.IsNull())
    {
      Message::SendFail() << "Error: object '" << theArgVec[1] << "'is already defined and is not a color scale";
      return 1;
    }
  }

  if (theArgNb <= 2)
  {
    if (aColorScale.IsNull())
    {
      Message::SendFail() << "Syntax error: colorscale with a given name does not exist";
      return 1;
    }

    theDI << "Color scale parameters for '"<< theArgVec[1] << "':\n"
          << "Min range: "            << aColorScale->GetMin() << "\n"
          << "Max range: "            << aColorScale->GetMax() << "\n"
          << "Number of intervals: "  << aColorScale->GetNumberOfIntervals() << "\n"
          << "Text height: "          << aColorScale->GetTextHeight() << "\n"
          << "Color scale position: " << aColorScale->GetXPosition() << " " << aColorScale->GetYPosition() << "\n"
          << "Color scale title: "    << aColorScale->GetTitle() << "\n"
          << "Label position: ";
    switch (aColorScale->GetLabelPosition())
    {
      case Aspect_TOCSP_NONE:
        theDI << "None\n";
        break;
      case Aspect_TOCSP_LEFT:
        theDI << "Left\n";
        break;
      case Aspect_TOCSP_RIGHT:
        theDI << "Right\n";
        break;
      case Aspect_TOCSP_CENTER:
        theDI << "Center\n";
        break;
    }
    return 0;
  }

  if (aColorScale.IsNull())
  {
    aColorScale = new AIS_ColorScale();
    aColorScale->SetZLayer (Graphic3d_ZLayerId_TopOSD);
    aContext->SetTransformPersistence (aColorScale, new Graphic3d_TransformPers (Graphic3d_TMF_2d, Aspect_TOTP_LEFT_LOWER));
  }

  ViewerTest_AutoUpdater anUpdateTool (aContext, aView);
  for (Standard_Integer anArgIter = 2; anArgIter < theArgNb; ++anArgIter)
  {
    Standard_CString        anArg = theArgVec[anArgIter];
    TCollection_AsciiString aFlag (anArg);
    aFlag.LowerCase();
    if (anUpdateTool.parseRedrawMode (aFlag))
    {
      continue;
    }
    else if (aFlag == "-range")
    {
      if (anArgIter + 3 >= theArgNb)
      {
        Message::SendFail() << "Error: wrong syntax at argument '" << anArg << "'";
        return 1;
      }

      const TCollection_AsciiString aRangeMin    (theArgVec[++anArgIter]);
      const TCollection_AsciiString aRangeMax    (theArgVec[++anArgIter]);
      const TCollection_AsciiString aNbIntervals (theArgVec[++anArgIter]);
      if (!aRangeMin.IsRealValue (Standard_True)
       || !aRangeMax.IsRealValue (Standard_True))
      {
        Message::SendFail ("Syntax error: the range values should be real");
        return 1;
      }
      else if (!aNbIntervals.IsIntegerValue())
      {
        Message::SendFail ("Syntax error: the number of intervals should be integer");
        return 1;
      }

      aColorScale->SetRange (aRangeMin.RealValue(), aRangeMax.RealValue());
      aColorScale->SetNumberOfIntervals (aNbIntervals.IntegerValue());
    }
    else if (aFlag == "-font")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      TCollection_AsciiString aFontArg(theArgVec[anArgIter + 1]);
      if (!aFontArg.IsIntegerValue())
      {
        Message::SendFail ("Syntax error: HeightFont value should be integer");
        return 1;
      }

      aColorScale->SetTextHeight (aFontArg.IntegerValue());
      anArgIter += 1;
    }
    else if (aFlag == "-textpos")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aTextPosArg(theArgVec[++anArgIter]);
      aTextPosArg.LowerCase();
      Aspect_TypeOfColorScalePosition aLabPosition = Aspect_TOCSP_NONE;
      if (aTextPosArg == "none")
      {
        aLabPosition = Aspect_TOCSP_NONE;
      }
      else if (aTextPosArg == "left")
      {
        aLabPosition = Aspect_TOCSP_LEFT;
      }
      else if (aTextPosArg == "right")
      {
        aLabPosition = Aspect_TOCSP_RIGHT;
      }
      else if (aTextPosArg == "center")
      {
        aLabPosition = Aspect_TOCSP_CENTER;
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown position '" << aTextPosArg << "'";
        return 1;
      }
      aColorScale->SetLabelPosition (aLabPosition);
    }
    else if (aFlag == "-logarithmic"
          || aFlag == "-log")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Synta error at argument '" << anArg << "'";
        return 1;
      }

      Standard_Boolean IsLog;
      if (!Draw::ParseOnOff(theArgVec[++anArgIter], IsLog))
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      aColorScale->SetLogarithmic (IsLog);
    }
    else if (aFlag == "-huerange"
          || aFlag == "-hue")
    {
      if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Real aHueMin = Draw::Atof (theArgVec[++anArgIter]);
      const Standard_Real aHueMax = Draw::Atof (theArgVec[++anArgIter]);
      aColorScale->SetHueRange (aHueMin, aHueMax);
    }
    else if (aFlag == "-colorrange")
    {
      Quantity_Color aColorMin, aColorMax;
      Standard_Integer aNbParsed1 = Draw::ParseColor (theArgNb  - (anArgIter + 1),
                                                      theArgVec + (anArgIter + 1),
                                                      aColorMin);
      anArgIter += aNbParsed1;
      Standard_Integer aNbParsed2 = Draw::ParseColor (theArgNb  - (anArgIter + 1),
                                                      theArgVec + (anArgIter + 1),
                                                      aColorMax);
      anArgIter += aNbParsed2;
      if (aNbParsed1 == 0
       || aNbParsed2 == 0)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }

      aColorScale->SetColorRange (aColorMin, aColorMax);
    }
    else if (aFlag == "-reversed"
          || aFlag == "-inverted"
          || aFlag == "-topdown"
          || aFlag == "-bottomup")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff(theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      aColorScale->SetReversed ((aFlag == "-topdown") ? !toEnable : toEnable);
    }
    else if (aFlag == "-smooth"
          || aFlag == "-smoothtransition")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      aColorScale->SetSmoothTransition (toEnable);
    }
    else if (aFlag == "-xy")
    {
      if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const TCollection_AsciiString anX (theArgVec[++anArgIter]);
      const TCollection_AsciiString anY (theArgVec[++anArgIter]);
      if (!anX.IsIntegerValue()
       || !anY.IsIntegerValue())
      {
        Message::SendFail ("Syntax error: coordinates should be integer values");
        return 1;
      }

      aColorScale->SetPosition (anX.IntegerValue(), anY.IntegerValue());
    }
    else if (aFlag == "-width"
          || aFlag == "-w"
          || aFlag == "-breadth")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const TCollection_AsciiString aBreadth (theArgVec[++anArgIter]);
      if (!aBreadth.IsIntegerValue())
      {
        Message::SendFail ("Syntax error: a width should be an integer value");
        return 1;
      }
      aColorScale->SetBreadth (aBreadth.IntegerValue());
    }
    else if (aFlag == "-height"
          || aFlag == "-h")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const TCollection_AsciiString aHeight (theArgVec[++anArgIter]);
      if (!aHeight.IsIntegerValue())
      {
        Message::SendFail ("Syntax error: a width should be an integer value");
        return 1;
      }
      aColorScale->SetHeight (aHeight.IntegerValue());
    }
    else if (aFlag == "-color")
    {
      if (aColorScale->GetColorType() != Aspect_TOCSD_USER)
      {
        Message::SendFail ("Syntax error: wrong color type. Call -colors before to set user-specified colors");
        return 1;
      }
      else if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const TCollection_AsciiString anInd (theArgVec[++anArgIter]);
      if (!anInd.IsIntegerValue())
      {
        Message::SendFail ("Syntax error: Index value should be integer");
        return 1;
      }
      const Standard_Integer anIndex = anInd.IntegerValue();
      if (anIndex <= 0 || anIndex > aColorScale->GetNumberOfIntervals())
      {
        Message::SendFail() << "Syntax error: Index value should be within range 1.." << aColorScale->GetNumberOfIntervals();
        return 1;
      }

      Quantity_Color aColor;
      Standard_Integer aNbParsed = Draw::ParseColor (theArgNb  - (anArgIter + 1),
                                                     theArgVec + (anArgIter + 1),
                                                     aColor);
      if (aNbParsed == 0)
      {
        Message::SendFail() << "Error: wrong syntax at '" << anArg << "'";
        return 1;
      }
      aColorScale->SetIntervalColor (aColor, anIndex);
      aColorScale->SetColorType (Aspect_TOCSD_USER);
      anArgIter += aNbParsed;
    }
    else if (aFlag == "-label")
    {
      if (aColorScale->GetColorType() != Aspect_TOCSD_USER)
      {
        Message::SendFail ("Syntax error: wrong label type. Call -labels before to set user-specified labels");
        return 1;
      }
      else if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      Standard_Integer anIndex = Draw::Atoi (theArgVec[anArgIter + 1]);
      if (anIndex <= 0 || anIndex > aColorScale->GetNumberOfIntervals() + 1)
      {
        Message::SendFail() << "Syntax error: Index value should be within range 1.." << (aColorScale->GetNumberOfIntervals() + 1);
        return 1;
      }

      TCollection_ExtendedString aText (theArgVec[anArgIter + 2], Standard_True);
      aColorScale->SetLabel     (aText, anIndex);
      aColorScale->SetLabelType (Aspect_TOCSD_USER);
      anArgIter += 2;
    }
    else if (aFlag == "-labelat"
          || aFlag == "-labat"
          || aFlag == "-labelatborder"
          || aFlag == "-labatborder"
          || aFlag == "-labelatcenter"
          || aFlag == "-labatcenter")
    {
      Standard_Boolean toEnable = Standard_True;
      if (aFlag == "-labelat"
       || aFlag == "-labat")
      {
        Standard_Integer aLabAtBorder = -1;
        if (++anArgIter >= theArgNb)
        {
          TCollection_AsciiString anAtBorder (theArgVec[anArgIter]);
          anAtBorder.LowerCase();
          if (anAtBorder == "border")
          {
            aLabAtBorder = 1;
          }
          else if (anAtBorder == "center")
          {
            aLabAtBorder = 0;
          }
        }
        if (aLabAtBorder == -1)
        {
          Message::SendFail() << "Syntax error at argument '" << anArg << "'";
          return 1;
        }
        toEnable = (aLabAtBorder == 1);
      }
      else if (anArgIter + 1 < theArgNb
            && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      aColorScale->SetLabelAtBorder (aFlag == "-labelatcenter"
                                  || aFlag == "-labatcenter"
                                   ? !toEnable
                                   :  toEnable);
    }
    else if (aFlag == "-colors")
    {
      Aspect_SequenceOfColor aSeq;
      for (;;)
      {
        Quantity_Color aColor;
        Standard_Integer aNbParsed = Draw::ParseColor (theArgNb  - (anArgIter + 1),
                                                       theArgVec + (anArgIter + 1),
                                                       aColor);
        if (aNbParsed == 0)
        {
          break;
        }
        anArgIter += aNbParsed;
        aSeq.Append (aColor);
      }
      if (aSeq.Length() != aColorScale->GetNumberOfIntervals())
      {
        Message::SendFail() << "Error: not enough arguments! You should provide color names or RGB color values for every interval of the "
                            << aColorScale->GetNumberOfIntervals() << " intervals";
        return 1;
      }

      aColorScale->SetColors    (aSeq);
      aColorScale->SetColorType (Aspect_TOCSD_USER);
    }
    else if (aFlag == "-uniform")
    {
      const Standard_Real aLightness = Draw::Atof (theArgVec[++anArgIter]);
      const Standard_Real aHueStart = Draw::Atof (theArgVec[++anArgIter]);
      const Standard_Real aHueEnd = Draw::Atof (theArgVec[++anArgIter]);
      aColorScale->SetUniformColors (aLightness, aHueStart, aHueEnd);
      aColorScale->SetColorType (Aspect_TOCSD_USER);
    }
    else if (aFlag == "-labels"
          || aFlag == "-freelabels")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      Standard_Integer aNbLabels = aColorScale->IsLabelAtBorder()
                                 ? aColorScale->GetNumberOfIntervals() + 1
                                 : aColorScale->GetNumberOfIntervals();
      if (aFlag == "-freelabels")
      {
        ++anArgIter;
        aNbLabels = Draw::Atoi (theArgVec[anArgIter]);
      }
      if (anArgIter + aNbLabels >= theArgNb)
      {
        Message::SendFail() << "Syntax error: not enough arguments. " << aNbLabels << " text labels are expected";
        return 1;
      }

      TColStd_SequenceOfExtendedString aSeq;
      for (Standard_Integer aLabelIter = 0; aLabelIter < aNbLabels; ++aLabelIter)
      {
        aSeq.Append (TCollection_ExtendedString (theArgVec[++anArgIter], Standard_True));
      }
      aColorScale->SetLabels (aSeq);
      aColorScale->SetLabelType (Aspect_TOCSD_USER);
    }
    else if (aFlag == "-title")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      Standard_Boolean isTwoArgs = Standard_False;
      if (anArgIter + 2 < theArgNb)
      {
        TCollection_AsciiString aSecondArg (theArgVec[anArgIter + 2]);
        aSecondArg.LowerCase();
      Standard_DISABLE_DEPRECATION_WARNINGS
        if (aSecondArg == "none")
        {
          aColorScale->SetTitlePosition (Aspect_TOCSP_NONE);
          isTwoArgs = Standard_True;
        }
        else if (aSecondArg == "left")
        {
          aColorScale->SetTitlePosition (Aspect_TOCSP_LEFT);
          isTwoArgs = Standard_True;
        }
        else if (aSecondArg == "right")
        {
          aColorScale->SetTitlePosition (Aspect_TOCSP_RIGHT);
          isTwoArgs = Standard_True;
        }
        else if (aSecondArg == "center")
        {
          aColorScale->SetTitlePosition (Aspect_TOCSP_CENTER);
          isTwoArgs = Standard_True;
        }
      Standard_ENABLE_DEPRECATION_WARNINGS
      }

      TCollection_ExtendedString aTitle(theArgVec[anArgIter + 1], Standard_True);
      aColorScale->SetTitle (aTitle);
      if (isTwoArgs)
      {
        anArgIter += 1;
      }
      anArgIter += 1;
    }
    else if (aFlag == "-demoversion"
          || aFlag == "-demo")
    {
      aColorScale->SetPosition (0, 0);
      aColorScale->SetTextHeight (16);
      aColorScale->SetRange (0.0, 100.0);
      aColorScale->SetNumberOfIntervals (10);
      aColorScale->SetBreadth (0);
      aColorScale->SetHeight  (0);
      aColorScale->SetLabelPosition (Aspect_TOCSP_RIGHT);
      aColorScale->SetColorType (Aspect_TOCSD_AUTO);
      aColorScale->SetLabelType (Aspect_TOCSD_AUTO);
    }
    else if (aFlag == "-findcolor")
    {
      if (anArgIter + 1 >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString anArg1 (theArgVec[++anArgIter]);

      if (!anArg1.IsRealValue (Standard_True))
      {
        Message::SendFail ("Syntax error: the value should be real");
        return 1;
      }

      Quantity_Color aColor;
      aColorScale->FindColor (anArg1.RealValue(), aColor);
      theDI << Quantity_Color::StringName (aColor.Name());
      return 0;
    }
    else
    {
      Message::SendFail() << "Syntax error at " << anArg << " - unknown argument";
      return 1;
    }
  }

  Standard_Integer aWinWidth = 0, aWinHeight = 0;
  aView->Window()->Size (aWinWidth, aWinHeight);
  if (aColorScale->GetBreadth() == 0)
  {
    aColorScale->SetBreadth (aWinWidth);
  }
  if (aColorScale->GetHeight() == 0)
  {
    aColorScale->SetHeight (aWinHeight);
  }
  aColorScale->SetToUpdate();
  ViewerTest::Display (theArgVec[1], aColorScale, Standard_False, Standard_True);
  return 0;
}

//==============================================================================
//function : VGraduatedTrihedron
//purpose  : Displays or hides a graduated trihedron
//==============================================================================
static Standard_Boolean GetColor (const TCollection_AsciiString& theValue,
                                  Quantity_Color& theColor)
{
  Quantity_NameOfColor aColorName;
  TCollection_AsciiString aVal = theValue;
  aVal.UpperCase();
  if (!Quantity_Color::ColorFromName (aVal.ToCString(), aColorName))
  {
    return Standard_False;
  }
  theColor = Quantity_Color (aColorName);
  return Standard_True;
}

static int VGraduatedTrihedron (Draw_Interpretor& /*theDi*/, Standard_Integer theArgNum, const char** theArgs)
{
  if (theArgNum < 2)
  {
    Message::SendFail() << "Syntax error: wrong number of parameters. Type 'help"
                        << theArgs[0] <<"' for more information";
    return 1;
  }

  NCollection_DataMap<TCollection_AsciiString, Handle(TColStd_HSequenceOfAsciiString)> aMapOfArgs;
  TCollection_AsciiString aParseKey;
  for (Standard_Integer anArgIt = 1; anArgIt < theArgNum; ++anArgIt)
  {
    TCollection_AsciiString anArg (theArgs [anArgIt]);

    if (anArg.Value (1) == '-' && !anArg.IsRealValue (Standard_True))
    {
      aParseKey = anArg;
      aParseKey.Remove (1);
      aParseKey.LowerCase();
      aMapOfArgs.Bind (aParseKey, new TColStd_HSequenceOfAsciiString);
      continue;
    }

    if (aParseKey.IsEmpty())
    {
      continue;
    }

    aMapOfArgs(aParseKey)->Append (anArg);
  }

  // Check parameters
  for (NCollection_DataMap<TCollection_AsciiString, Handle(TColStd_HSequenceOfAsciiString)>::Iterator aMapIt (aMapOfArgs);
       aMapIt.More(); aMapIt.Next())
  {
    const TCollection_AsciiString& aKey = aMapIt.Key();
    const Handle(TColStd_HSequenceOfAsciiString)& anArgs = aMapIt.Value();

    // Bool key, without arguments
    if ((aKey.IsEqual ("on") || aKey.IsEqual ("off"))
        && anArgs->IsEmpty())
    {
      continue;
    }

    // One argument
    if ( (aKey.IsEqual ("xname") || aKey.IsEqual ("yname") || aKey.IsEqual ("zname"))
          && anArgs->Length() == 1)
    {
      continue;
    }

    // On/off arguments
    if ((aKey.IsEqual ("xdrawname") || aKey.IsEqual ("ydrawname") || aKey.IsEqual ("zdrawname")
        || aKey.IsEqual ("xdrawticks") || aKey.IsEqual ("ydrawticks") || aKey.IsEqual ("zdrawticks")
        || aKey.IsEqual ("xdrawvalues") || aKey.IsEqual ("ydrawvalues") || aKey.IsEqual ("zdrawvalues")
        || aKey.IsEqual ("drawgrid") || aKey.IsEqual ("drawaxes"))
        && anArgs->Length() == 1 && (anArgs->Value(1).IsEqual ("on") || anArgs->Value(1).IsEqual ("off")))
    {
      continue;
    }

    // One string argument
    if ( (aKey.IsEqual ("xnamecolor") || aKey.IsEqual ("ynamecolor") || aKey.IsEqual ("znamecolor")
          || aKey.IsEqual ("xcolor") || aKey.IsEqual ("ycolor") || aKey.IsEqual ("zcolor"))
          && anArgs->Length() == 1 && !anArgs->Value(1).IsIntegerValue() && !anArgs->Value(1).IsRealValue (Standard_True))
    {
      continue;
    }

    // One integer argument
    if ( (aKey.IsEqual ("xticks") || aKey.IsEqual ("yticks") || aKey.IsEqual ("zticks")
          || aKey.IsEqual ("xticklength") || aKey.IsEqual ("yticklength") || aKey.IsEqual ("zticklength")
          || aKey.IsEqual ("xnameoffset") || aKey.IsEqual ("ynameoffset") || aKey.IsEqual ("znameoffset")
          || aKey.IsEqual ("xvaluesoffset") || aKey.IsEqual ("yvaluesoffset") || aKey.IsEqual ("zvaluesoffset"))
         && anArgs->Length() == 1 && anArgs->Value(1).IsIntegerValue())
    {
      continue;
    }

    // One real argument
    if ( aKey.IsEqual ("arrowlength")
         && anArgs->Length() == 1 && (anArgs->Value(1).IsIntegerValue() || anArgs->Value(1).IsRealValue (Standard_True)))
    {
      continue;
    }

    // Two string arguments
    if ( (aKey.IsEqual ("namefont") || aKey.IsEqual ("valuesfont"))
         && anArgs->Length() == 1 && !anArgs->Value(1).IsIntegerValue() && !anArgs->Value(1).IsRealValue (Standard_True))
    {
      continue;
    }

    TCollection_AsciiString aLowerKey;
    aLowerKey  = "-";
    aLowerKey += aKey;
    aLowerKey.LowerCase();
    Message::SendFail() << "Syntax error: " << aLowerKey << " is unknown option, or the arguments are unacceptable.\n"
                        << "Type help for more information";
    return 1;
  }

  Handle(AIS_InteractiveContext) anAISContext = ViewerTest::GetAISContext();
  if (anAISContext.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean toDisplay = Standard_True;
  Quantity_Color aColor;
  Graphic3d_GraduatedTrihedron aTrihedronData;
  // Process parameters
  Handle(TColStd_HSequenceOfAsciiString) aValues;
  if (aMapOfArgs.Find ("off", aValues))
  {
    toDisplay = Standard_False;
  }

  // AXES NAMES
  if (aMapOfArgs.Find ("xname", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetName (aValues->Value(1));
  }
  if (aMapOfArgs.Find ("yname", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetName (aValues->Value(1));
  }
  if (aMapOfArgs.Find ("zname", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetName (aValues->Value(1));
  }
  if (aMapOfArgs.Find ("xdrawname", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetDrawName (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("ydrawname", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetDrawName (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("zdrawname", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetDrawName (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("xnameoffset", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetNameOffset (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("ynameoffset", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetNameOffset (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("znameoffset", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetNameOffset (aValues->Value(1).IntegerValue());
  }

  // COLORS
  if (aMapOfArgs.Find ("xnamecolor", aValues))
  {
    if (!GetColor (aValues->Value(1), aColor))
    {
      Message::SendFail ("Syntax error: -xnamecolor wrong color name");
      return 1;
    }
    aTrihedronData.ChangeXAxisAspect().SetNameColor (aColor);
  }
  if (aMapOfArgs.Find ("ynamecolor", aValues))
  {
    if (!GetColor (aValues->Value(1), aColor))
    {
      Message::SendFail ("Syntax error: -ynamecolor wrong color name");
      return 1;
    }
    aTrihedronData.ChangeYAxisAspect().SetNameColor (aColor);
  }
  if (aMapOfArgs.Find ("znamecolor", aValues))
  {
    if (!GetColor (aValues->Value(1), aColor))
    {
      Message::SendFail ("Syntax error: -znamecolor wrong color name");
      return 1;
    }
    aTrihedronData.ChangeZAxisAspect().SetNameColor (aColor);
  }
  if (aMapOfArgs.Find ("xcolor", aValues))
  {
    if (!GetColor (aValues->Value(1), aColor))
    {
      Message::SendFail ("Syntax error: -xcolor wrong color name");
      return 1;
    }
    aTrihedronData.ChangeXAxisAspect().SetColor (aColor);
  }
  if (aMapOfArgs.Find ("ycolor", aValues))
  {
    if (!GetColor (aValues->Value(1), aColor))
    {
      Message::SendFail ("Syntax error: -ycolor wrong color name");
      return 1;
    }
    aTrihedronData.ChangeYAxisAspect().SetColor (aColor);
  }
  if (aMapOfArgs.Find ("zcolor", aValues))
  {
    if (!GetColor (aValues->Value(1), aColor))
    {
      Message::SendFail ("Syntax error: -zcolor wrong color name");
      return 1;
    }
    aTrihedronData.ChangeZAxisAspect().SetColor (aColor);
  }

  // TICKMARKS
  if (aMapOfArgs.Find ("xticks", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetTickmarksNumber (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("yticks", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetTickmarksNumber (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("zticks", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetTickmarksNumber (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("xticklength", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetTickmarksLength (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("yticklength", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetTickmarksLength (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("zticklength", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetTickmarksLength (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("xdrawticks", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetDrawTickmarks (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("ydrawticks", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetDrawTickmarks (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("zdrawticks", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetDrawTickmarks (aValues->Value(1).IsEqual ("on"));
  }

  // VALUES
  if (aMapOfArgs.Find ("xdrawvalues", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetDrawValues (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("ydrawvalues", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetDrawValues (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("zdrawvalues", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetDrawValues (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("xvaluesoffset", aValues))
  {
    aTrihedronData.ChangeXAxisAspect().SetValuesOffset (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("yvaluesoffset", aValues))
  {
    aTrihedronData.ChangeYAxisAspect().SetValuesOffset (aValues->Value(1).IntegerValue());
  }
  if (aMapOfArgs.Find ("zvaluesoffset", aValues))
  {
    aTrihedronData.ChangeZAxisAspect().SetValuesOffset (aValues->Value(1).IntegerValue());
  }

  // ARROWS
  if (aMapOfArgs.Find ("arrowlength", aValues))
  {
    aTrihedronData.SetArrowsLength ((Standard_ShortReal) aValues->Value(1).RealValue());
  }

  // FONTS
  if (aMapOfArgs.Find ("namefont", aValues))
  {
    aTrihedronData.SetNamesFont (aValues->Value(1));
  }
  if (aMapOfArgs.Find ("valuesfont", aValues))
  {
    aTrihedronData.SetValuesFont (aValues->Value(1));
  }

  if (aMapOfArgs.Find ("drawgrid", aValues))
  {
    aTrihedronData.SetDrawGrid (aValues->Value(1).IsEqual ("on"));
  }
  if (aMapOfArgs.Find ("drawaxes", aValues))
  {
    aTrihedronData.SetDrawAxes (aValues->Value(1).IsEqual ("on"));
  }

  // The final step: display of erase trihedron
  if (toDisplay)
  {
    ViewerTest::CurrentView()->GraduatedTrihedronDisplay (aTrihedronData);
  }
  else
  {
    ViewerTest::CurrentView()->GraduatedTrihedronErase();
  }

  ViewerTest::GetAISContext()->UpdateCurrentViewer();
  ViewerTest::CurrentView()->Redraw();

  return 0;
}

//==============================================================================
//function : VTile
//purpose  :
//==============================================================================
static int VTile (Draw_Interpretor& theDI,
                  Standard_Integer  theArgNb,
                  const char**      theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Graphic3d_CameraTile aTile = aView->Camera()->Tile();
  if (theArgNb < 2)
  {
    theDI << "Total size: " << aTile.TotalSize.x() << " " << aTile.TotalSize.y() << "\n"
          << "Tile  size: " << aTile.TileSize.x()  << " " << aTile.TileSize.y()  << "\n"
          << "Lower left: " << aTile.Offset.x()    << " " << aTile.Offset.y()    << "\n";
    return 0;
  }

  aView->Window()->Size (aTile.TileSize.x(), aTile.TileSize.y());
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anArg == "-lowerleft"
     || anArg == "-upperleft")
    {
      if (anArgIter + 3 < theArgNb)
      {
        Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }
      aTile.IsTopDown = (anArg == "-upperleft") == Standard_True;
      aTile.Offset.x() = Draw::Atoi (theArgVec[anArgIter + 1]);
      aTile.Offset.y() = Draw::Atoi (theArgVec[anArgIter + 2]);
    }
    else if (anArg == "-total"
          || anArg == "-totalsize"
          || anArg == "-viewsize")
    {
      if (anArgIter + 3 < theArgNb)
      {
        Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }
      aTile.TotalSize.x() = Draw::Atoi (theArgVec[anArgIter + 1]);
      aTile.TotalSize.y() = Draw::Atoi (theArgVec[anArgIter + 2]);
      if (aTile.TotalSize.x() < 1
       || aTile.TotalSize.y() < 1)
      {
        Message::SendFail ("Error: total size is incorrect");
        return 1;
      }
    }
    else if (anArg == "-tilesize")
    {
      if (anArgIter + 3 < theArgNb)
      {
        Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }

      aTile.TileSize.x() = Draw::Atoi (theArgVec[anArgIter + 1]);
      aTile.TileSize.y() = Draw::Atoi (theArgVec[anArgIter + 2]);
      if (aTile.TileSize.x() < 1
       || aTile.TileSize.y() < 1)
      {
        Message::SendFail ("Error: tile size is incorrect");
        return 1;
      }
    }
    else if (anArg == "-unset")
    {
      aView->Camera()->SetTile (Graphic3d_CameraTile());
      aView->Redraw();
      return 0;
    }
  }

  if (aTile.TileSize.x() < 1
   || aTile.TileSize.y() < 1)
  {
    Message::SendFail ("Error: tile size is undefined");
    return 1;
  }
  else if (aTile.TotalSize.x() < 1
        || aTile.TotalSize.y() < 1)
  {
    Message::SendFail ("Error: total size is undefined");
    return 1;
  }

  aView->Camera()->SetTile (aTile);
  aView->Redraw();
  return 0;
}

//! Format ZLayer ID.
inline const char* formZLayerId (const Standard_Integer theLayerId)
{
  switch (theLayerId)
  {
    case Graphic3d_ZLayerId_UNKNOWN: return "[INVALID]";
    case Graphic3d_ZLayerId_Default: return "[DEFAULT]";
    case Graphic3d_ZLayerId_Top:     return "[TOP]";
    case Graphic3d_ZLayerId_Topmost: return "[TOPMOST]";
    case Graphic3d_ZLayerId_TopOSD:  return "[OVERLAY]";
    case Graphic3d_ZLayerId_BotOSD:  return "[UNDERLAY]";
  }
  return "";
}

//! Print the ZLayer information.
inline void printZLayerInfo (Draw_Interpretor& theDI,
                             const Graphic3d_ZLayerSettings& theLayer)
{
  if (!theLayer.Name().IsEmpty())
  {
    theDI << "  Name: " << theLayer.Name() << "\n";
  }
  if (theLayer.IsImmediate())
  {
    theDI << "  Immediate: TRUE\n";
  }
  theDI << "  Origin: " << theLayer.Origin().X() << " " << theLayer.Origin().Y() << " " << theLayer.Origin().Z() << "\n";
  theDI << "  Culling distance: "      << theLayer.CullingDistance() << "\n";
  theDI << "  Culling size: "          << theLayer.CullingSize() << "\n";
  theDI << "  Depth test:   "          << (theLayer.ToEnableDepthTest() ? "enabled" : "disabled") << "\n";
  theDI << "  Depth write:  "          << (theLayer.ToEnableDepthWrite() ? "enabled" : "disabled") << "\n";
  theDI << "  Depth buffer clearing: " << (theLayer.ToClearDepth() ? "enabled" : "disabled") << "\n";
  if (theLayer.PolygonOffset().Mode != Aspect_POM_None)
  {
    theDI << "  Depth offset: " << theLayer.PolygonOffset().Factor << " " << theLayer.PolygonOffset().Units << "\n";
  }
}

//==============================================================================
//function : VZLayer
//purpose  : Test z layer operations for v3d viewer
//==============================================================================
static int VZLayer (Draw_Interpretor& theDI,
                    Standard_Integer  theArgNb,
                    const char**      theArgVec)
{
  Handle(AIS_InteractiveContext) aContextAIS = ViewerTest::GetAISContext();
  if (aContextAIS.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  const Handle(V3d_Viewer)& aViewer = aContextAIS->CurrentViewer();
  if (theArgNb < 2)
  {
    TColStd_SequenceOfInteger aLayers;
    aViewer->GetAllZLayers (aLayers);
    for (TColStd_SequenceOfInteger::Iterator aLayeriter (aLayers); aLayeriter.More(); aLayeriter.Next())
    {
      theDI << "ZLayer " << aLayeriter.Value() << " " << formZLayerId (aLayeriter.Value()) << "\n";
      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayeriter.Value());
      printZLayerInfo (theDI, aSettings);
    }
    return 0;
  }

  Standard_Integer anArgIter = 1;
  Standard_Integer aLayerId = Graphic3d_ZLayerId_UNKNOWN;
  ViewerTest_AutoUpdater anUpdateTool (aContextAIS, ViewerTest::CurrentView());
  if (anUpdateTool.parseRedrawMode (theArgVec[anArgIter]))
  {
    ++anArgIter;
  }

  {
    TCollection_AsciiString aFirstArg (theArgVec[anArgIter]);
    if (aFirstArg.IsIntegerValue())
    {
      ++anArgIter;
      aLayerId = aFirstArg.IntegerValue();
    }
    else
    {
      if (ViewerTest::ParseZLayerName (aFirstArg.ToCString(), aLayerId))
      {
        ++anArgIter;
      }
    }
  }

  Graphic3d_ZLayerId anOtherLayerId = Graphic3d_ZLayerId_UNKNOWN;
  for (; anArgIter < theArgNb; ++anArgIter)
  {
    // perform operation
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      //
    }
    else if (anArg == "-add"
          || anArg == "add")
    {
      aLayerId = Graphic3d_ZLayerId_UNKNOWN;
      if (!aViewer->AddZLayer (aLayerId))
      {
        Message::SendFail ("Error: can not add a new z layer");
        return 0;
      }

      theDI << aLayerId;
    }
    else if (anArg == "-insertbefore"
          && anArgIter + 1 < theArgNb
          && ViewerTest::ParseZLayer (theArgVec[anArgIter + 1], anOtherLayerId))
    {
      ++anArgIter;
      aLayerId = Graphic3d_ZLayerId_UNKNOWN;
      if (!aViewer->InsertLayerBefore (aLayerId, Graphic3d_ZLayerSettings(), anOtherLayerId))
      {
        Message::SendFail ("Error: can not add a new z layer");
        return 0;
      }

      theDI << aLayerId;
    }
    else if (anArg == "-insertafter"
          && anArgIter + 1 < theArgNb
          && ViewerTest::ParseZLayer (theArgVec[anArgIter + 1], anOtherLayerId))
    {
      ++anArgIter;
      aLayerId = Graphic3d_ZLayerId_UNKNOWN;
      if (!aViewer->InsertLayerAfter (aLayerId, Graphic3d_ZLayerSettings(), anOtherLayerId))
      {
        Message::SendFail ("Error: can not add a new z layer");
        return 0;
      }

      theDI << aLayerId;
    }
    else if (anArg == "-del"
          || anArg == "-delete"
          || anArg == "del")
    {
      if (aLayerId == Graphic3d_ZLayerId_UNKNOWN)
      {
        if (++anArgIter >= theArgNb)
        {
          Message::SendFail ("Syntax error: id of z layer to remove is missing");
          return 1;
        }

        aLayerId = Draw::Atoi (theArgVec[anArgIter]);
      }

      if (aLayerId == Graphic3d_ZLayerId_UNKNOWN
       || aLayerId == Graphic3d_ZLayerId_Default
       || aLayerId == Graphic3d_ZLayerId_Top
       || aLayerId == Graphic3d_ZLayerId_Topmost
       || aLayerId == Graphic3d_ZLayerId_TopOSD
       || aLayerId == Graphic3d_ZLayerId_BotOSD)
      {
        Message::SendFail ("Syntax error: standard Z layer can not be removed");
        return 1;
      }

      // move all object displayed in removing layer to default layer
      for (ViewerTest_DoubleMapIteratorOfDoubleMapOfInteractiveAndName anObjIter (GetMapOfAIS());
           anObjIter.More(); anObjIter.Next())
      {
        const Handle(AIS_InteractiveObject)& aPrs = anObjIter.Key1();
        if (aPrs.IsNull()
         || aPrs->ZLayer() != aLayerId)
        {
          continue;
        }
        aPrs->SetZLayer (Graphic3d_ZLayerId_Default);
      }

      if (!aViewer->RemoveZLayer (aLayerId))
      {
        Message::SendFail ("Z layer can not be removed");
      }
      else
      {
        theDI << aLayerId << " ";
      }
    }
    else if (anArg == "-get"
          || anArg == "get")
    {
      TColStd_SequenceOfInteger aLayers;
      aViewer->GetAllZLayers (aLayers);
      for (TColStd_SequenceOfInteger::Iterator aLayeriter (aLayers); aLayeriter.More(); aLayeriter.Next())
      {
        theDI << aLayeriter.Value() << " ";
      }

      theDI << "\n";
    }
    else if (anArg == "-name")
    {
      if (aLayerId == Graphic3d_ZLayerId_UNKNOWN)
      {
        Message::SendFail ("Syntax error: id of Z layer is missing");
        return 1;
      }

      if (++anArgIter >= theArgNb)
      {
        Message::SendFail ("Syntax error: name is missing");
        return 1;
      }

      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerId);
      aSettings.SetName (theArgVec[anArgIter]);
      aViewer->SetZLayerSettings (aLayerId, aSettings);
    }
    else if (anArg == "-origin")
    {
      if (aLayerId == Graphic3d_ZLayerId_UNKNOWN)
      {
        Message::SendFail ("Syntax error: id of Z layer is missing");
        return 1;
      }

      if (anArgIter + 2 >= theArgNb)
      {
        Message::SendFail ("Syntax error: origin coordinates are missing");
        return 1;
      }

      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerId);
      gp_XYZ anOrigin;
      anOrigin.SetX (Draw::Atof (theArgVec[anArgIter + 1]));
      anOrigin.SetY (Draw::Atof (theArgVec[anArgIter + 2]));
      anOrigin.SetZ (0.0);
      if (anArgIter + 3 < theArgNb)
      {
        anOrigin.SetZ (Draw::Atof (theArgVec[anArgIter + 3]));
        anArgIter += 3;
      }
      else
      {
        anArgIter += 2;
      }
      aSettings.SetOrigin (anOrigin);
      aViewer->SetZLayerSettings (aLayerId, aSettings);
    }
    else if (aLayerId != Graphic3d_ZLayerId_UNKNOWN
          && anArgIter + 1 < theArgNb
          && (anArg == "-cullingdistance"
           || anArg == "-cullingdist"
           || anArg == "-culldistance"
           || anArg == "-culldist"
           || anArg == "-distcull"
           || anArg == "-distculling"
           || anArg == "-distanceculling"))
    {
      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerId);
      const Standard_Real aDist = Draw::Atof (theArgVec[++anArgIter]);
      aSettings.SetCullingDistance (aDist);
      aViewer->SetZLayerSettings (aLayerId, aSettings);
    }
    else if (aLayerId != Graphic3d_ZLayerId_UNKNOWN
          && anArgIter + 1 < theArgNb
          && (anArg == "-cullingsize"
           || anArg == "-cullsize"
           || anArg == "-sizecull"
           || anArg == "-sizeculling"))
    {
      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerId);
      const Standard_Real aSize = Draw::Atof (theArgVec[++anArgIter]);
      aSettings.SetCullingSize (aSize);
      aViewer->SetZLayerSettings (aLayerId, aSettings);
    }
    else if (anArg == "-settings"
          || anArg == "settings")
    {
      if (aLayerId == Graphic3d_ZLayerId_UNKNOWN)
      {
        if (++anArgIter >= theArgNb)
        {
          Message::SendFail ("Syntax error: id of Z layer is missing");
          return 1;
        }

        aLayerId = Draw::Atoi (theArgVec[anArgIter]);
      }

      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerId);
      printZLayerInfo (theDI, aSettings);
    }
    else if (anArg == "-enable"
          || anArg == "enable"
          || anArg == "-disable"
          || anArg == "disable")
    {
      const Standard_Boolean toEnable = anArg == "-enable"
                                     || anArg == "enable";
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail ("Syntax error: option name is missing");
        return 1;
      }

      TCollection_AsciiString aSubOp (theArgVec[anArgIter]);
      aSubOp.LowerCase();
      if (aLayerId == Graphic3d_ZLayerId_UNKNOWN)
      {
        if (++anArgIter >= theArgNb)
        {
          Message::SendFail ("Syntax error: id of Z layer is missing");
          return 1;
        }

        aLayerId = Draw::Atoi (theArgVec[anArgIter]);
      }

      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerId);
      if (aSubOp == "depthtest"
       || aSubOp == "test")
      {
        aSettings.SetEnableDepthTest (toEnable);
      }
      else if (aSubOp == "depthwrite"
            || aSubOp == "write")
      {
        aSettings.SetEnableDepthWrite (toEnable);
      }
      else if (aSubOp == "depthclear"
            || aSubOp == "clear")
      {
        aSettings.SetClearDepth (toEnable);
      }
      else if (aSubOp == "depthoffset"
            || aSubOp == "offset")
      {
        Graphic3d_PolygonOffset aParams;
        aParams.Mode = toEnable ? Aspect_POM_Fill : Aspect_POM_None;
        if (toEnable)
        {
          if (anArgIter + 2 >= theArgNb)
          {
            Message::SendFail ("Syntax error: factor and units values for depth offset are missing");
            return 1;
          }

          aParams.Factor = static_cast<Standard_ShortReal> (Draw::Atof (theArgVec[++anArgIter]));
          aParams.Units  = static_cast<Standard_ShortReal> (Draw::Atof (theArgVec[++anArgIter]));
        }
        aSettings.SetPolygonOffset (aParams);
      }
      else if (aSubOp == "positiveoffset"
            || aSubOp == "poffset")
      {
        if (toEnable)
        {
          aSettings.SetDepthOffsetPositive();
        }
        else
        {
          aSettings.SetPolygonOffset (Graphic3d_PolygonOffset());
        }
      }
      else if (aSubOp == "negativeoffset"
            || aSubOp == "noffset")
      {
        if (toEnable)
        {
          aSettings.SetDepthOffsetNegative();
        }
        else
        {
          aSettings.SetPolygonOffset(Graphic3d_PolygonOffset());
        }
      }
      else if (aSubOp == "textureenv")
      {
        aSettings.SetEnvironmentTexture (toEnable);
      }
      else if (aSubOp == "raytracing")
      {
        aSettings.SetRaytracable (toEnable);
      }

      aViewer->SetZLayerSettings (aLayerId, aSettings);
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown option " << theArgVec[anArgIter];
      return 1;
    }
  }

  return 0;
}

// The interactive presentation of 2d layer item
// for "vlayerline" command it provides a presentation of
// line with user-defined linewidth, linetype and transparency.
class V3d_LineItem : public AIS_InteractiveObject
{
public:
  // CASCADE RTTI
  DEFINE_STANDARD_RTTI_INLINE(V3d_LineItem,AIS_InteractiveObject)

  // constructor
  Standard_EXPORT V3d_LineItem(Standard_Real X1, Standard_Real Y1,
                               Standard_Real X2, Standard_Real Y2,
                               Aspect_TypeOfLine theType = Aspect_TOL_SOLID,
                               Standard_Real theWidth    = 0.5,
                               Standard_Real theTransp   = 1.0);

private:

  virtual void Compute (const Handle(PrsMgr_PresentationManager)& thePrsMgr,
                        const Handle(Prs3d_Presentation)& thePrs,
                        const Standard_Integer theMode) Standard_OVERRIDE;

  virtual void ComputeSelection (const Handle(SelectMgr_Selection)& ,
                                 const Standard_Integer ) Standard_OVERRIDE
  {}

private:

  Standard_Real       myX1, myY1, myX2, myY2;
  Aspect_TypeOfLine   myType;
  Standard_Real       myWidth;
};

// default constructor for line item
V3d_LineItem::V3d_LineItem(Standard_Real X1, Standard_Real Y1,
                           Standard_Real X2, Standard_Real Y2,
                           Aspect_TypeOfLine theType,
                           Standard_Real theWidth,
                           Standard_Real theTransp) :
  myX1(X1), myY1(Y1), myX2(X2), myY2(Y2),
  myType(theType), myWidth(theWidth)
{
  SetTransparency (1-theTransp);
}

// render line
void V3d_LineItem::Compute (const Handle(PrsMgr_PresentationManager)& ,
                            const Handle(Prs3d_Presentation)& thePresentation,
                            const Standard_Integer )
{
  thePresentation->Clear();
  Quantity_Color aColor (Quantity_NOC_RED);
  Standard_Integer aWidth, aHeight;
  ViewerTest::CurrentView()->Window()->Size (aWidth, aHeight);
  Handle(Graphic3d_Group) aGroup = thePresentation->CurrentGroup();
  Handle(Graphic3d_ArrayOfPolylines) aPrim = new Graphic3d_ArrayOfPolylines(5);
  aPrim->AddVertex(myX1, aHeight-myY1, 0.);
  aPrim->AddVertex(myX2, aHeight-myY2, 0.);
  Handle(Prs3d_LineAspect) anAspect = new Prs3d_LineAspect (aColor, (Aspect_TypeOfLine)myType, myWidth);
  aGroup->SetPrimitivesAspect (anAspect->Aspect());
  aGroup->AddPrimitiveArray (aPrim);
}

//=============================================================================
//function : VLayerLine
//purpose  : Draws line in the v3d view layer with given attributes: linetype,
//         : linewidth, transparency coefficient
//============================================================================
static int VLayerLine(Draw_Interpretor& di, Standard_Integer argc, const char** argv)
{
  // get the active view
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    di << "Call vinit before!\n";
    return 1;
  }
  else if (argc < 5)
  {
    di << "Use: " << argv[0];
    di << " x1 y1 x2 y2 [linewidth = 0.5] [linetype = 0] [transparency = 1]\n";
    di << " linetype : { 0 | 1 | 2 | 3 } \n";
    di << "              0 - solid  \n";
    di << "              1 - dashed \n";
    di << "              2 - dot    \n";
    di << "              3 - dashdot\n";
    di << " transparency : { 0.0 - 1.0 } \n";
    di << "                  0.0 - transparent\n";
    di << "                  1.0 - visible    \n";
    return 1;
  }

  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  // get the input params
  Standard_Real X1 = Draw::Atof(argv[1]);
  Standard_Real Y1 = Draw::Atof(argv[2]);
  Standard_Real X2 = Draw::Atof(argv[3]);
  Standard_Real Y2 = Draw::Atof(argv[4]);

  Standard_Real aWidth = 0.5;
  Standard_Real aTransparency = 1.0;

  // has width
  if (argc > 5)
    aWidth = Draw::Atof(argv[5]);

  // select appropriate line type
  Aspect_TypeOfLine aLineType = Aspect_TOL_SOLID;
  if (argc > 6
  && !ViewerTest::ParseLineType (argv[6], aLineType))
  {
    Message::SendFail() << "Syntax error: unknown line type '" << argv[6] << "'";
    return 1;
  }

  // has transparency
  if (argc > 7)
  {
    aTransparency = Draw::Atof(argv[7]);
    if (aTransparency < 0 || aTransparency > 1.0)
      aTransparency = 1.0;
  }

  static Handle (V3d_LineItem) aLine;
  if (!aLine.IsNull())
  {
    aContext->Erase (aLine, Standard_False);
  }
  aLine = new V3d_LineItem (X1, Y1, X2, Y2,
                            aLineType, aWidth,
                            aTransparency);

  aContext->SetTransformPersistence (aLine, new Graphic3d_TransformPers (Graphic3d_TMF_2d, Aspect_TOTP_LEFT_LOWER));
  aLine->SetZLayer (Graphic3d_ZLayerId_TopOSD);
  aLine->SetToUpdate();
  aContext->Display (aLine, Standard_True);

  return 0;
}


//==============================================================================
//function : VGrid
//purpose  :
//==============================================================================

static int VGrid (Draw_Interpretor& /*theDI*/,
                  Standard_Integer  theArgNb,
                  const char**      theArgVec)
{
  Handle(V3d_View)   aView   = ViewerTest::CurrentView();
  Handle(V3d_Viewer) aViewer = ViewerTest::GetViewerFromContext();
  if (aView.IsNull() || aViewer.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Aspect_GridType     aType = aViewer->GridType();
  Aspect_GridDrawMode aMode = aViewer->GridDrawMode();
  Graphic3d_Vec2d aNewOriginXY, aNewStepXY, aNewSizeXY;
  Standard_Real aNewRotAngle = 0.0, aNewZOffset = 0.0;
  bool hasOrigin = false, hasStep = false, hasRotAngle = false, hasSize = false, hasZOffset = false;
  ViewerTest_AutoUpdater anUpdateTool (ViewerTest::GetAISContext(), aView);
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (theArgVec[anArgIter]))
    {
      continue;
    }
    else if (anArgIter + 1 < theArgNb
          && anArg == "-type")
    {
      TCollection_AsciiString anArgNext (theArgVec[++anArgIter]);
      anArgNext.LowerCase();
      if (anArgNext == "r"
       || anArgNext == "rect"
       || anArgNext == "rectangular")
      {
        aType = Aspect_GT_Rectangular;
      }
      else if (anArgNext == "c"
            || anArgNext == "circ"
            || anArgNext == "circular")
      {
        aType = Aspect_GT_Circular;
      }
      else
      {
        Message::SendFail() << "Syntax error at '" << anArgNext << "'";
        return 1;
      }
    }
    else if (anArgIter + 1 < theArgNb
          && anArg == "-mode")
    {
      TCollection_AsciiString anArgNext (theArgVec[++anArgIter]);
      anArgNext.LowerCase();
      if (anArgNext == "l"
       || anArgNext == "line"
       || anArgNext == "lines")
      {
        aMode = Aspect_GDM_Lines;
      }
      else if (anArgNext == "p"
            || anArgNext == "point"
            || anArgNext == "points")
      {
        aMode = Aspect_GDM_Points;
      }
      else
      {
        Message::SendFail() << "Syntax error at '" << anArgNext << "'";
        return 1;
      }
    }
    else if (anArgIter + 2 < theArgNb
          && (anArg == "-origin"
           || anArg == "-orig"))
    {
      hasOrigin = true;
      aNewOriginXY.SetValues (Draw::Atof (theArgVec[anArgIter + 1]),
                              Draw::Atof (theArgVec[anArgIter + 2]));
      anArgIter += 2;
    }
    else if (anArgIter + 2 < theArgNb
          && anArg == "-step")
    {
      hasStep = true;
      aNewStepXY.SetValues (Draw::Atof (theArgVec[anArgIter + 1]),
                            Draw::Atof (theArgVec[anArgIter + 2]));
      if (aNewStepXY.x() <= 0.0
       || aNewStepXY.y() <= 0.0)
      {
        Message::SendFail() << "Syntax error: wrong step '" << theArgVec[anArgIter + 1] << " " << theArgVec[anArgIter + 2] << "'";
        return 1;
      }
      anArgIter += 2;
    }
    else if (anArgIter + 1 < theArgNb
          && (anArg == "-angle"
           || anArg == "-rotangle"
           || anArg == "-rotationangle"))
    {
      hasRotAngle = true;
      aNewRotAngle = Draw::Atof (theArgVec[++anArgIter]);
    }
    else if (anArgIter + 1 < theArgNb
          && (anArg == "-zoffset"
           || anArg == "-dz"))
    {
      hasZOffset = true;
      aNewZOffset = Draw::Atof (theArgVec[++anArgIter]);
    }
    else if (anArgIter + 1 < theArgNb
          && anArg == "-radius")
    {
      hasSize = true;
      ++anArgIter;
      aNewSizeXY.SetValues (Draw::Atof (theArgVec[anArgIter]), 0.0);
      if (aNewStepXY.x() <= 0.0)
      {
        Message::SendFail() << "Syntax error: wrong size '" << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
    else if (anArgIter + 2 < theArgNb
          && anArg == "-size")
    {
      hasSize = true;
      aNewSizeXY.SetValues (Draw::Atof (theArgVec[anArgIter + 1]),
                            Draw::Atof (theArgVec[anArgIter + 2]));
      if (aNewStepXY.x() <= 0.0
       || aNewStepXY.y() <= 0.0)
      {
        Message::SendFail() << "Syntax error: wrong size '" << theArgVec[anArgIter + 1] << " " << theArgVec[anArgIter + 2] << "'";
        return 1;
      }
      anArgIter += 2;
    }
    else if (anArg == "r"
          || anArg == "rect"
          || anArg == "rectangular")
    {
      aType = Aspect_GT_Rectangular;
    }
    else if (anArg == "c"
          || anArg == "circ"
          || anArg == "circular")
    {
      aType = Aspect_GT_Circular;
    }
    else if (anArg == "l"
          || anArg == "line"
          || anArg == "lines")
    {
      aMode = Aspect_GDM_Lines;
    }
    else if (anArg == "p"
          || anArg == "point"
          || anArg == "points")
    {
      aMode = Aspect_GDM_Points;
    }
    else if (anArgIter + 1 >= theArgNb
          && anArg == "off")
    {
      aViewer->DeactivateGrid();
      return 0;
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
      return 1;
    }
  }

  if (aType == Aspect_GT_Rectangular)
  {
    Graphic3d_Vec2d anOrigXY, aStepXY;
    Standard_Real aRotAngle = 0.0;
    aViewer->RectangularGridValues (anOrigXY.x(), anOrigXY.y(), aStepXY.x(), aStepXY.y(), aRotAngle);
    if (hasOrigin)
    {
      anOrigXY = aNewOriginXY;
    }
    if (hasStep)
    {
      aStepXY = aNewStepXY;
    }
    if (hasRotAngle)
    {
      aRotAngle = aNewRotAngle;
    }
    aViewer->SetRectangularGridValues (anOrigXY.x(), anOrigXY.y(), aStepXY.x(), aStepXY.y(), aRotAngle);
    if (hasSize || hasZOffset)
    {
      Graphic3d_Vec3d aSize;
      aViewer->RectangularGridGraphicValues (aSize.x(), aSize.y(), aSize.z());
      if (hasSize)
      {
        aSize.x() = aNewSizeXY.x();
        aSize.y() = aNewSizeXY.y();
      }
      if (hasZOffset)
      {
        aSize.z() = aNewZOffset;
      }
      aViewer->SetRectangularGridGraphicValues (aSize.x(), aSize.y(), aSize.z());
    }
  }
  else if (aType == Aspect_GT_Circular)
  {
    Graphic3d_Vec2d anOrigXY;
    Standard_Real aRadiusStep;
    Standard_Integer aDivisionNumber;
    Standard_Real aRotAngle = 0.0;
    aViewer->CircularGridValues (anOrigXY.x(), anOrigXY.y(), aRadiusStep, aDivisionNumber, aRotAngle);
    if (hasOrigin)
    {
      anOrigXY = aNewOriginXY;
    }
    if (hasStep)
    {
      aRadiusStep     = aNewStepXY[0];
      aDivisionNumber = (int )aNewStepXY[1];
      if (aDivisionNumber < 1)
      {
        Message::SendFail() << "Syntax error: invalid division number '" << aNewStepXY[1] << "'";
        return 1;
      }
    }
    if (hasRotAngle)
    {
      aRotAngle = aNewRotAngle;
    }

    aViewer->SetCircularGridValues (anOrigXY.x(), anOrigXY.y(), aRadiusStep, aDivisionNumber, aRotAngle);
    if (hasSize || hasZOffset)
    {
      Standard_Real aRadius = 0.0, aZOffset = 0.0;
      aViewer->CircularGridGraphicValues (aRadius, aZOffset);
      if (hasSize)
      {
        aRadius = aNewSizeXY.x();
        if (aNewSizeXY.y() != 0.0)
        {
          Message::SendFail ("Syntax error: circular size should be specified as radius");
          return 1;
        }
      }
      if (hasZOffset)
      {
        aZOffset = aNewZOffset;
      }
      aViewer->SetCircularGridGraphicValues (aRadius, aZOffset);
    }
  }
  aViewer->ActivateGrid (aType, aMode);
  return 0;
}

//==============================================================================
//function : VPriviledgedPlane
//purpose  :
//==============================================================================

static int VPriviledgedPlane (Draw_Interpretor& theDI,
                              Standard_Integer  theArgNb,
                              const char**      theArgVec)
{
  if (theArgNb != 1 && theArgNb != 7 && theArgNb != 10)
  {
    Message::SendFail ("Error: wrong number of arguments! See usage:");
    theDI.PrintHelp (theArgVec[0]);
    return 1;
  }

  // get the active viewer
  Handle(V3d_Viewer) aViewer = ViewerTest::GetViewerFromContext();
  if (aViewer.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  if (theArgNb == 1)
  {
    gp_Ax3 aPriviledgedPlane = aViewer->PrivilegedPlane();
    const gp_Pnt& anOrig = aPriviledgedPlane.Location();
    const gp_Dir& aNorm = aPriviledgedPlane.Direction();
    const gp_Dir& aXDir = aPriviledgedPlane.XDirection();
    theDI << "Origin: " << anOrig.X() << " " << anOrig.Y() << " " << anOrig.Z() << " "
          << "Normal: " << aNorm.X() << " " << aNorm.Y() << " " << aNorm.Z() << " "
          << "X-dir: "  << aXDir.X() << " " << aXDir.Y() << " " << aXDir.Z() << "\n";
    return 0;
  }

  Standard_Integer anArgIdx = 1;
  Standard_Real anOrigX = Draw::Atof (theArgVec[anArgIdx++]);
  Standard_Real anOrigY = Draw::Atof (theArgVec[anArgIdx++]);
  Standard_Real anOrigZ = Draw::Atof (theArgVec[anArgIdx++]);
  Standard_Real aNormX  = Draw::Atof (theArgVec[anArgIdx++]);
  Standard_Real aNormY  = Draw::Atof (theArgVec[anArgIdx++]);
  Standard_Real aNormZ  = Draw::Atof (theArgVec[anArgIdx++]);

  gp_Ax3 aPriviledgedPlane;
  gp_Pnt anOrig (anOrigX, anOrigY, anOrigZ);
  gp_Dir aNorm (aNormX, aNormY, aNormZ);
  if (theArgNb > 7)
  {
    Standard_Real aXDirX = Draw::Atof (theArgVec[anArgIdx++]);
    Standard_Real aXDirY = Draw::Atof (theArgVec[anArgIdx++]);
    Standard_Real aXDirZ = Draw::Atof (theArgVec[anArgIdx++]);
    gp_Dir aXDir (aXDirX, aXDirY, aXDirZ);
    aPriviledgedPlane = gp_Ax3 (anOrig, aNorm, aXDir);
  }
  else
  {
    aPriviledgedPlane = gp_Ax3 (anOrig, aNorm);
  }

  aViewer->SetPrivilegedPlane (aPriviledgedPlane);

  return 0;
}

//==============================================================================
//function : VConvert
//purpose  :
//==============================================================================

static int VConvert (Draw_Interpretor& theDI,
                     Standard_Integer  theArgNb,
                     const char**      theArgVec)
{
  // get the active view
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  enum { Model, Ray, View, Window, Grid } aMode = Model;

  // access coordinate arguments
  TColStd_SequenceOfReal aCoord;
  Standard_Integer anArgIdx = 1;
  for (; anArgIdx < 4 && anArgIdx < theArgNb; ++anArgIdx)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIdx]);
    if (!anArg.IsRealValue (Standard_True))
    {
      break;
    }
    aCoord.Append (anArg.RealValue());
  }

  // non-numeric argument too early
  if (aCoord.IsEmpty())
  {
    Message::SendFail ("Error: wrong number of arguments! See usage:");
    theDI.PrintHelp (theArgVec[0]);
    return 1;
  }

  // collect all other arguments and options
  for (; anArgIdx < theArgNb; ++anArgIdx)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIdx]);
    anArg.LowerCase();
    if      (anArg == "window") aMode = Window;
    else if (anArg == "view")   aMode = View;
    else if (anArg == "grid")   aMode = Grid;
    else if (anArg == "ray")    aMode = Ray;
    else
    {
      Message::SendFail() << "Error: wrong argument " << anArg << "! See usage:";
      theDI.PrintHelp (theArgVec[0]);
      return 1;
    }
  }

  // complete input checks
  if ((aCoord.Length() == 1 && theArgNb > 3) ||
      (aCoord.Length() == 2 && theArgNb > 4) ||
      (aCoord.Length() == 3 && theArgNb > 5))
  {
    Message::SendFail ("Error: wrong number of arguments! See usage:");
    theDI.PrintHelp (theArgVec[0]);
    return 1;
  }

  Standard_Real aXYZ[6] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
  Standard_Integer aXYp[2] = {0, 0};

  // convert one-dimensional coordinate
  if (aCoord.Length() == 1)
  {
    switch (aMode)
    {
      case View   : theDI << "View Vv: "   << aView->Convert ((Standard_Integer)aCoord (1)); return 0;
      case Window : theDI << "Window Vp: " << aView->Convert (aCoord (1)); return 0;
      default:
        Message::SendFail ("Error: wrong arguments! See usage:");
        theDI.PrintHelp (theArgVec[0]);
        return 1;
    }
  }

  // convert 2D coordinates from projection or view reference space
  if (aCoord.Length() == 2)
  {
    switch (aMode)
    {
      case Model :
        aView->Convert ((Standard_Integer) aCoord (1), (Standard_Integer) aCoord (2), aXYZ[0], aXYZ[1], aXYZ[2]);
        theDI << "Model X,Y,Z: " << aXYZ[0] << " " << aXYZ[1] << " " << aXYZ[2] << "\n";
        return 0;

      case View :
        aView->Convert ((Standard_Integer) aCoord (1), (Standard_Integer) aCoord (2), aXYZ[0], aXYZ[1]);
        theDI << "View Xv,Yv: " << aXYZ[0] << " " << aXYZ[1] << "\n";
        return 0;

      case Window :
        aView->Convert (aCoord (1), aCoord (2), aXYp[0], aXYp[1]);
        theDI << "Window Xp,Yp: " << aXYp[0] << " " << aXYp[1] << "\n";
        return 0;

      case Grid :
        aView->Convert ((Standard_Integer) aCoord (1), (Standard_Integer) aCoord (2), aXYZ[0], aXYZ[1], aXYZ[2]);
        aView->ConvertToGrid (aXYZ[0], aXYZ[1], aXYZ[2], aXYZ[3], aXYZ[4], aXYZ[5]);
        theDI << "Model X,Y,Z: " << aXYZ[3] << " " << aXYZ[4] << " " << aXYZ[5] << "\n";
        return 0;

      case Ray :
        aView->ConvertWithProj ((Standard_Integer) aCoord (1),
                                (Standard_Integer) aCoord (2),
                                aXYZ[0], aXYZ[1], aXYZ[2],
                                aXYZ[3], aXYZ[4], aXYZ[5]);
        theDI << "Model DX,DY,DZ: " << aXYZ[3] << " " << aXYZ[4] << " " << aXYZ[5] << "\n";
        return 0;

      default:
        Message::SendFail ("Error: wrong arguments! See usage:");
        theDI.PrintHelp (theArgVec[0]);
        return 1;
    }
  }

  // convert 3D coordinates from view reference space
  else if (aCoord.Length() == 3)
  {
    switch (aMode)
    {
      case Window :
        aView->Convert (aCoord (1), aCoord (2), aCoord (3), aXYp[0], aXYp[1]);
        theDI << "Window Xp,Yp: " << aXYp[0] << " " << aXYp[1] << "\n";
        return 0;

      case Grid :
        aView->ConvertToGrid (aCoord (1), aCoord (2), aCoord (3), aXYZ[0], aXYZ[1], aXYZ[2]);
        theDI << "Model X,Y,Z: " << aXYZ[0] << " " << aXYZ[1] << " " << aXYZ[2] << "\n";
        return 0;

      default:
        Message::SendFail ("Error: wrong arguments! See usage:");
        theDI.PrintHelp (theArgVec[0]);
        return 1;
    }
  }

  return 0;
}

//==============================================================================
//function : VFps
//purpose  :
//==============================================================================

static int VFps (Draw_Interpretor& theDI,
                 Standard_Integer  theArgNb,
                 const char**      theArgVec)
{
  // get the active view
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Integer aFramesNb = -1;
  Standard_Real aDuration = -1.0;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (aDuration < 0.0
     && anArgIter + 1 < theArgNb
     && (anArg == "-duration"
      || anArg == "-dur"
      || anArg == "-time"))
    {
      aDuration = Draw::Atof (theArgVec[++anArgIter]);
    }
    else if (aFramesNb < 0
          && anArg.IsIntegerValue())
    {
      aFramesNb = anArg.IntegerValue();
      if (aFramesNb <= 0)
      {
        Message::SendFail() << "Syntax error at '" << anArg << "'";
        return 1;
      }
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
      return 1;
    }
  }
  if (aFramesNb < 0 && aDuration < 0.0)
  {
    aFramesNb = 100;
  }

  // the time is meaningless for first call
  // due to async OpenGl rendering
  aView->Redraw();

  // redraw view in loop to estimate average values
  OSD_Timer aTimer;
  aTimer.Start();
  Standard_Integer aFrameIter = 1;
  for (;; ++aFrameIter)
  {
    aView->Redraw();
    if ((aFramesNb > 0
      && aFrameIter >= aFramesNb)
     || (aDuration > 0.0
      && aTimer.ElapsedTime() >= aDuration))
    {
      break;
    }
  }
  aTimer.Stop();
  Standard_Real aCpu;
  const Standard_Real aTime = aTimer.ElapsedTime();
  aTimer.OSD_Chronometer::Show (aCpu);

  const Standard_Real aFpsAver = Standard_Real(aFrameIter) / aTime;
  const Standard_Real aCpuAver = aCpu / Standard_Real(aFrameIter);

  // return statistics
  theDI << "FPS: " << aFpsAver << "\n"
        << "CPU: " << (1000.0 * aCpuAver) << " msec\n";

  // compute additional statistics in ray-tracing mode
  const Graphic3d_RenderingParams& aParams = aView->RenderingParams();
  if (aParams.Method == Graphic3d_RM_RAYTRACING)
  {
    Graphic3d_Vec2i aWinSize (0, 0);
    aView->Window()->Size (aWinSize.x(), aWinSize.y());

    // 1 shadow ray and 1 secondary ray pew each bounce
    const Standard_Real aMRays = aWinSize.x() * aWinSize.y() * aFpsAver * aParams.RaytracingDepth * 2 / 1.0e6f;
    theDI << "MRays/sec (upper bound): " << aMRays << "\n";
  }

  return 0;
}


//==============================================================================
//function : VMemGpu
//purpose  :
//==============================================================================

static int VMemGpu (Draw_Interpretor& theDI,
                    Standard_Integer  theArgNb,
                    const char**      theArgVec)
{
  // get the context
  Handle(AIS_InteractiveContext) aContextAIS = ViewerTest::GetAISContext();
  if (aContextAIS.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Handle(Graphic3d_GraphicDriver) aDriver = aContextAIS->CurrentViewer()->Driver();
  if (aDriver.IsNull())
  {
    Message::SendFail ("Error: graphic driver not available");
    return 1;
  }

  Standard_Size aFreeBytes = 0;
  TCollection_AsciiString anInfo;
  if (!aDriver->MemoryInfo (aFreeBytes, anInfo))
  {
    Message::SendFail ("Error: information not available");
    return 1;
  }

  if (theArgNb > 1 && *theArgVec[1] == 'f')
  {
    theDI << Standard_Real (aFreeBytes);
  }
  else
  {
    theDI << anInfo;
  }

  return 0;
}

// ==============================================================================
// function : VReadPixel
// purpose  :
// ==============================================================================
static int VReadPixel (Draw_Interpretor& theDI,
                       Standard_Integer  theArgNb,
                       const char**      theArgVec)
{
  // get the active view
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }
  else if (theArgNb < 3)
  {
    Message::SendFail() << "Syntax error: wrong number of arguments.\n"
                        << "Usage: " << theArgVec[0] << " xPixel yPixel [{rgb|rgba|depth|hls|rgbf|rgbaf}=rgba] [name]";
    return 1;
  }

  Image_Format         aFormat     = Image_Format_RGBA;
  Graphic3d_BufferType aBufferType = Graphic3d_BT_RGBA;

  Standard_Integer aWidth, aHeight;
  aView->Window()->Size (aWidth, aHeight);
  const Standard_Integer anX = Draw::Atoi (theArgVec[1]);
  const Standard_Integer anY = Draw::Atoi (theArgVec[2]);
  if (anX < 0 || anX >= aWidth || anY < 0 || anY > aHeight)
  {
    Message::SendFail() << "Error: pixel coordinates (" << anX << "; " << anY << ") are out of view (" << aWidth << " x " << aHeight << ")";
    return 1;
  }

  bool toShowName = false, toShowHls = false, toShowHex = false, toShow_sRGB = false;
  for (Standard_Integer anIter = 3; anIter < theArgNb; ++anIter)
  {
    TCollection_AsciiString aParam (theArgVec[anIter]);
    aParam.LowerCase();
    if (aParam == "-rgb"
     || aParam == "rgb"
     || aParam == "-srgb"
     || aParam == "srgb")
    {
      aFormat     = Image_Format_RGB;
      aBufferType = Graphic3d_BT_RGB;
      toShow_sRGB = aParam == "-srgb" || aParam == "srgb";
    }
    else if (aParam == "-hls"
          || aParam == "hls")
    {
      aFormat     = Image_Format_RGB;
      aBufferType = Graphic3d_BT_RGB;
      toShowHls   = Standard_True;
    }
    else if (aParam == "-rgbf"
          || aParam == "rgbf")
    {
      aFormat     = Image_Format_RGBF;
      aBufferType = Graphic3d_BT_RGB;
    }
    else if (aParam == "-rgba"
          || aParam == "rgba"
          || aParam == "-srgba"
          || aParam == "srgba")
    {
      aFormat     = Image_Format_RGBA;
      aBufferType = Graphic3d_BT_RGBA;
      toShow_sRGB = aParam == "-srgba" || aParam == "srgba";
    }
    else if (aParam == "-rgbaf"
          || aParam == "rgbaf")
    {
      aFormat     = Image_Format_RGBAF;
      aBufferType = Graphic3d_BT_RGBA;
    }
    else if (aParam == "-depth"
          || aParam == "depth")
    {
      aFormat     = Image_Format_GrayF;
      aBufferType = Graphic3d_BT_Depth;
    }
    else if (aParam == "-name"
          || aParam == "name")
    {
      toShowName = Standard_True;
    }
    else if (aParam == "-hex"
          || aParam == "hex")
    {
      toShowHex = Standard_True;
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << aParam << "'";
      return 1;
    }
  }

  Image_PixMap anImage;
  if (!anImage.InitTrash (aFormat, aWidth, aHeight))
  {
    Message::SendFail ("Error: image allocation failed");
    return 1;
  }
  else if (!aView->ToPixMap (anImage, aWidth, aHeight, aBufferType))
  {
    Message::SendFail ("Error: image dump failed");
    return 1;
  }

  // redirect possible warning messages that could have been added by ToPixMap
  // into the Tcl interpretor (via DefaultMessenger) to cout, so that they do not
  // contaminate result of the command
  Standard_CString aWarnLog = theDI.Result();
  if (aWarnLog != NULL && aWarnLog[0] != '\0')
  {
    std::cout << aWarnLog << std::endl;
  }
  theDI.Reset();

  Quantity_ColorRGBA aColor = anImage.PixelColor (anX, anY, true);
  if (toShowName)
  {
    if (aBufferType == Graphic3d_BT_RGBA)
    {
      theDI << Quantity_Color::StringName (aColor.GetRGB().Name()) << " " << aColor.Alpha();
    }
    else
    {
      theDI << Quantity_Color::StringName (aColor.GetRGB().Name());
    }
  }
  else if (toShowHex)
  {
    if (aBufferType == Graphic3d_BT_RGBA)
    {
      theDI << Quantity_ColorRGBA::ColorToHex (aColor);
    }
    else
    {
      theDI << Quantity_Color::ColorToHex (aColor.GetRGB());
    }
  }
  else
  {
    switch (aBufferType)
    {
      default:
      case Graphic3d_BT_RGB:
      {
        if (toShowHls)
        {
          theDI << aColor.GetRGB().Hue() << " " << aColor.GetRGB().Light() << " " << aColor.GetRGB().Saturation();
        }
        else if (toShow_sRGB)
        {
          const Graphic3d_Vec4 aColor_sRGB = Quantity_ColorRGBA::Convert_LinearRGB_To_sRGB ((Graphic3d_Vec4 )aColor);
          theDI << aColor_sRGB.r() << " " << aColor_sRGB.g() << " " << aColor_sRGB.b();
        }
        else
        {
          theDI << aColor.GetRGB().Red() << " " << aColor.GetRGB().Green() << " " << aColor.GetRGB().Blue();
        }
        break;
      }
      case Graphic3d_BT_RGBA:
      {
        const Graphic3d_Vec4 aVec4 = toShow_sRGB ? Quantity_ColorRGBA::Convert_LinearRGB_To_sRGB ((Graphic3d_Vec4 )aColor) : (Graphic3d_Vec4 )aColor;
        theDI << aVec4.r() << " " << aVec4.g() << " " << aVec4.b() << " " << aVec4.a();
        break;
      }
      case Graphic3d_BT_Depth:
      {
        theDI << aColor.GetRGB().Red();
        break;
      }
    }
  }

  return 0;
}

//! Auxiliary presentation for an image plane.
class ViewerTest_ImagePrs : public AIS_InteractiveObject
{
public:
  //! Main constructor.
  ViewerTest_ImagePrs (const Handle(Image_PixMap)& theImage,
                       const Standard_Real theWidth,
                       const Standard_Real theHeight,
                       const TCollection_AsciiString& theLabel)
  : myLabel (theLabel), myWidth (theWidth), myHeight(theHeight)
  {
    SetDisplayMode (0);
    SetHilightMode (1);
    myDynHilightDrawer->SetZLayer (Graphic3d_ZLayerId_Topmost);
    {
      myDrawer->SetShadingAspect (new Prs3d_ShadingAspect());
      const Handle(Graphic3d_AspectFillArea3d)& aFillAspect = myDrawer->ShadingAspect()->Aspect();
      Graphic3d_MaterialAspect aMat;
      aMat.SetMaterialType (Graphic3d_MATERIAL_PHYSIC);
      aMat.SetAmbientColor  (Quantity_NOC_BLACK);
      aMat.SetDiffuseColor  (Quantity_NOC_WHITE);
      aMat.SetSpecularColor (Quantity_NOC_BLACK);
      aMat.SetEmissiveColor (Quantity_NOC_BLACK);
      aFillAspect->SetFrontMaterial (aMat);
      aFillAspect->SetTextureMap (new Graphic3d_Texture2Dmanual (theImage));
      aFillAspect->SetTextureMapOn();
    }
    {
      Handle(Prs3d_TextAspect) aTextAspect = new Prs3d_TextAspect();
      aTextAspect->SetHorizontalJustification (Graphic3d_HTA_CENTER);
      aTextAspect->SetVerticalJustification   (Graphic3d_VTA_CENTER);
      myDrawer->SetTextAspect (aTextAspect);
    }
    {
      const gp_Dir aNorm (0.0, 0.0, 1.0);
      myTris = new Graphic3d_ArrayOfTriangles (4, 6, true, false, true);
      myTris->AddVertex (gp_Pnt(-myWidth * 0.5, -myHeight * 0.5, 0.0), aNorm, gp_Pnt2d (0.0, 0.0));
      myTris->AddVertex (gp_Pnt( myWidth * 0.5, -myHeight * 0.5, 0.0), aNorm, gp_Pnt2d (1.0, 0.0));
      myTris->AddVertex (gp_Pnt(-myWidth * 0.5,  myHeight * 0.5, 0.0), aNorm, gp_Pnt2d (0.0, 1.0));
      myTris->AddVertex (gp_Pnt( myWidth * 0.5,  myHeight * 0.5, 0.0), aNorm, gp_Pnt2d (1.0, 1.0));
      myTris->AddEdge (1);
      myTris->AddEdge (2);
      myTris->AddEdge (3);
      myTris->AddEdge (3);
      myTris->AddEdge (2);
      myTris->AddEdge (4);

      myRect = new Graphic3d_ArrayOfPolylines (4);
      myRect->AddVertex (myTris->Vertice (1));
      myRect->AddVertex (myTris->Vertice (3));
      myRect->AddVertex (myTris->Vertice (4));
      myRect->AddVertex (myTris->Vertice (2));
    }
  }

  //! Returns TRUE for accepted display modes.
  virtual Standard_Boolean AcceptDisplayMode (const Standard_Integer theMode) const Standard_OVERRIDE { return theMode == 0 || theMode == 1; }

  //! Compute presentation.
  virtual void Compute (const Handle(PrsMgr_PresentationManager)& ,
                        const Handle(Prs3d_Presentation)& thePrs,
                        const Standard_Integer theMode) Standard_OVERRIDE
  {
    switch (theMode)
    {
      case 0:
      {
        Handle(Graphic3d_Group) aGroup = thePrs->NewGroup();
        aGroup->AddPrimitiveArray (myTris);
        aGroup->SetGroupPrimitivesAspect (myDrawer->ShadingAspect()->Aspect());
        aGroup->AddPrimitiveArray (myRect);
        aGroup->SetGroupPrimitivesAspect (myDrawer->LineAspect()->Aspect());
        return;
      }
      case 1:
      {
        Prs3d_Text::Draw (thePrs->NewGroup(), myDrawer->TextAspect(), myLabel, gp_Pnt(0.0, 0.0, 0.0));
        Handle(Graphic3d_Group) aGroup = thePrs->NewGroup();
        aGroup->AddPrimitiveArray (myRect);
        aGroup->SetGroupPrimitivesAspect (myDrawer->LineAspect()->Aspect());
        return;
      }
    }
  }

  //! Compute selection.
  virtual void ComputeSelection (const Handle(SelectMgr_Selection)& theSel, const Standard_Integer theMode) Standard_OVERRIDE
  {
    if (theMode == 0)
    {
      Handle(SelectMgr_EntityOwner) anEntityOwner = new SelectMgr_EntityOwner (this, 5);
      Handle(Select3D_SensitivePrimitiveArray) aSensitive = new Select3D_SensitivePrimitiveArray (anEntityOwner);
      aSensitive->InitTriangulation (myTris->Attributes(), myTris->Indices(), TopLoc_Location());
      theSel->Add (aSensitive);
    }
  }

private:
  Handle(Graphic3d_ArrayOfTriangles) myTris;
  Handle(Graphic3d_ArrayOfPolylines) myRect;
  TCollection_AsciiString myLabel;
  Standard_Real myWidth;
  Standard_Real myHeight;
};

//==============================================================================
//function : VDiffImage
//purpose  : The draw-command compares two images.
//==============================================================================

static int VDiffImage (Draw_Interpretor& theDI, Standard_Integer theArgNb, const char** theArgVec)
{
  if (theArgNb < 3)
  {
    Message::SendFail ("Syntax error: not enough arguments");
    return 1;
  }

  Standard_Integer anArgIter = 1;
  TCollection_AsciiString anImgPathRef (theArgVec[anArgIter++]);
  TCollection_AsciiString anImgPathNew (theArgVec[anArgIter++]);
  TCollection_AsciiString aDiffImagePath;
  Standard_Real    aTolColor        = -1.0;
  Standard_Integer toBlackWhite     = -1;
  Standard_Integer isBorderFilterOn = -1;
  Standard_Boolean isOldSyntax = Standard_False;
  TCollection_AsciiString aViewName, aPrsNameRef, aPrsNameNew, aPrsNameDiff;
  for (; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anArgIter + 1 < theArgNb
     && (anArg == "-toleranceofcolor"
      || anArg == "-tolerancecolor"
      || anArg == "-tolerance"
      || anArg == "-toler"))
    {
      aTolColor = Atof (theArgVec[++anArgIter]);
      if (aTolColor < 0.0 || aTolColor > 1.0)
      {
        Message::SendFail() << "Syntax error at '" << anArg << " " << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
    else if (anArg == "-blackwhite")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      toBlackWhite = toEnable ? 1 : 0;
    }
    else if (anArg == "-borderfilter")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      isBorderFilterOn = toEnable ? 1 : 0;
    }
    else if (anArg == "-exitonclose")
    {
      ViewerTest_EventManager::ToExitOnCloseView() = true;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], ViewerTest_EventManager::ToExitOnCloseView()))
      {
        ++anArgIter;
      }
    }
    else if (anArg == "-closeonescape"
          || anArg == "-closeonesc")
    {
      ViewerTest_EventManager::ToCloseViewOnEscape() = true;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], ViewerTest_EventManager::ToCloseViewOnEscape()))
      {
        ++anArgIter;
      }
    }
    else if (anArgIter + 3 < theArgNb
          && anArg == "-display")
    {
      aViewName   = theArgVec[++anArgIter];
      aPrsNameRef = theArgVec[++anArgIter];
      aPrsNameNew = theArgVec[++anArgIter];
      if (anArgIter + 1 < theArgNb
      && *theArgVec[anArgIter + 1] != '-')
      {
        aPrsNameDiff = theArgVec[++anArgIter];
      }
    }
    else if (aTolColor < 0.0
          && anArg.IsRealValue (Standard_True))
    {
      isOldSyntax = Standard_True;
      aTolColor = anArg.RealValue();
      if (aTolColor < 0.0 || aTolColor > 1.0)
      {
        Message::SendFail() << "Syntax error at '" << anArg << " " << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
    else if (isOldSyntax
          && toBlackWhite == -1
          && (anArg == "0" || anArg == "1"))
    {
      toBlackWhite = anArg == "1" ? 1 : 0;
    }
    else if (isOldSyntax
          && isBorderFilterOn == -1
          && (anArg == "0" || anArg == "1"))
    {
      isBorderFilterOn = anArg == "1" ? 1 : 0;
    }
    else if (aDiffImagePath.IsEmpty())
    {
      aDiffImagePath = theArgVec[anArgIter];
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }

  Handle(Image_AlienPixMap) anImgRef = new Image_AlienPixMap();
  Handle(Image_AlienPixMap) anImgNew = new Image_AlienPixMap();
  if (!anImgRef->Load (anImgPathRef))
  {
    Message::SendFail() << "Error: image file '" << anImgPathRef << "' cannot be read";
    return 1;
  }
  if (!anImgNew->Load (anImgPathNew))
  {
    Message::SendFail() << "Error: image file '" << anImgPathNew << "' cannot be read";
    return 1;
  }

  // compare the images
  Image_Diff aComparer;
  Standard_Integer aDiffColorsNb = -1;
  if (aComparer.Init (anImgRef, anImgNew, toBlackWhite == 1))
  {
    aComparer.SetColorTolerance (aTolColor >= 0.0 ? aTolColor : 0.0);
    aComparer.SetBorderFilterOn (isBorderFilterOn == 1);
    aDiffColorsNb = aComparer.Compare();
    theDI << aDiffColorsNb << "\n";
  }

  // save image of difference
  Handle(Image_AlienPixMap) aDiff;
  if (aDiffColorsNb > 0
  && (!aDiffImagePath.IsEmpty() || !aPrsNameDiff.IsEmpty()))
  {
    aDiff = new Image_AlienPixMap();
    if (!aDiff->InitTrash (Image_Format_Gray, anImgRef->SizeX(), anImgRef->SizeY()))
    {
      Message::SendFail() << "Error: cannot allocate memory for diff image " << anImgRef->SizeX() << "x" << anImgRef->SizeY();
      return 1;
    }
    aComparer.SaveDiffImage (*aDiff);
    if (!aDiffImagePath.IsEmpty()
     && !aDiff->Save (aDiffImagePath))
    {
      Message::SendFail() << "Error: diff image file '" << aDiffImagePath << "' cannot be written";
      return 1;
    }
  }

  if (aViewName.IsEmpty())
  {
    return 0;
  }

  ViewerTest_Names aViewNames (aViewName);
  if (ViewerTest_myViews.IsBound1 (aViewNames.GetViewName()))
  {
    TCollection_AsciiString aCommand = TCollection_AsciiString ("vclose ") + aViewNames.GetViewName();
    theDI.Eval (aCommand.ToCString());
  }

  Standard_Integer aPxLeft = 0;
  Standard_Integer aPxTop  = 0;
  Standard_Integer aWinSizeX = int(anImgRef->SizeX() * 2);
  Standard_Integer aWinSizeY = !aDiff.IsNull() && !aPrsNameDiff.IsEmpty()
                              ? int(anImgRef->SizeY() * 2)
                              : int(anImgRef->SizeY());
  TCollection_AsciiString aDisplayName;
  TCollection_AsciiString aViewId = ViewerTest::ViewerInit (aPxLeft, aPxTop, aWinSizeX, aWinSizeY,
                                                            aViewName, aDisplayName);

  Standard_Real aRatio = anImgRef->Ratio();
  Standard_Real aSizeX = 1.0;
  Standard_Real aSizeY = aSizeX / aRatio;
  {
    OSD_Path aPath (anImgPathRef);
    TCollection_AsciiString aLabelRef;
    if (!aPath.Name().IsEmpty())
    {
      aLabelRef = aPath.Name() + aPath.Extension();
    }
    aLabelRef += TCollection_AsciiString() + "\n" + int(anImgRef->SizeX()) + "x" + int(anImgRef->SizeY());

    Handle(ViewerTest_ImagePrs) anImgRefPrs = new ViewerTest_ImagePrs (anImgRef, aSizeX, aSizeY, aLabelRef);
    gp_Trsf aTrsfRef;
    aTrsfRef.SetTranslationPart (gp_Vec (-aSizeX * 0.5, 0.0, 0.0));
    anImgRefPrs->SetLocalTransformation (aTrsfRef);
    ViewerTest::Display (aPrsNameRef, anImgRefPrs, false, true);
  }
  {
    OSD_Path aPath (anImgPathNew);
    TCollection_AsciiString aLabelNew;
    if (!aPath.Name().IsEmpty())
    {
      aLabelNew = aPath.Name() + aPath.Extension();
    }
    aLabelNew += TCollection_AsciiString() + "\n" + int(anImgNew->SizeX()) + "x" + int(anImgNew->SizeY());

    Handle(ViewerTest_ImagePrs) anImgNewPrs = new ViewerTest_ImagePrs (anImgNew, aSizeX, aSizeY, aLabelNew);
    gp_Trsf aTrsfRef;
    aTrsfRef.SetTranslationPart (gp_Vec (aSizeX * 0.5, 0.0, 0.0));
    anImgNewPrs->SetLocalTransformation (aTrsfRef);
    ViewerTest::Display (aPrsNameNew, anImgNewPrs, false, true);
  }
  Handle(ViewerTest_ImagePrs) anImgDiffPrs;
  if (!aDiff.IsNull())
  {
    anImgDiffPrs = new ViewerTest_ImagePrs (aDiff, aSizeX, aSizeY, TCollection_AsciiString() + "Difference: " + aDiffColorsNb + " pixels");
    gp_Trsf aTrsfDiff;
    aTrsfDiff.SetTranslationPart (gp_Vec (0.0, -aSizeY, 0.0));
    anImgDiffPrs->SetLocalTransformation (aTrsfDiff);
  }
  if (!aPrsNameDiff.IsEmpty())
  {
    ViewerTest::Display (aPrsNameDiff, anImgDiffPrs, false, true);
  }
  ViewerTest::CurrentView()->SetProj (V3d_Zpos);
  ViewerTest::CurrentView()->FitAll();
  return 0;
}

//=======================================================================
//function : VSelect
//purpose  : Emulates different types of selection by mouse:
//           1) single click selection
//           2) selection with rectangle having corners at pixel positions (x1,y1) and (x2,y2)
//           3) selection with polygon having corners at
//           pixel positions (x1,y1),...,(xn,yn)
//           4) any of these selections with shift button pressed
//=======================================================================
static Standard_Integer VSelect (Draw_Interpretor& ,
                                 Standard_Integer theNbArgs,
                                 const char** theArgVec)
{
  const Handle(AIS_InteractiveContext)& aCtx = ViewerTest::GetAISContext();
  if (aCtx.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  NCollection_Sequence<Graphic3d_Vec2i> aPnts;
  bool toAllowOverlap = false;
  AIS_SelectionScheme aSelScheme = AIS_SelectionScheme_Replace;
  for (Standard_Integer anArgIter = 1; anArgIter < theNbArgs; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anArg == "-allowoverlap")
    {
      toAllowOverlap = true;
      if (anArgIter + 1 < theNbArgs
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toAllowOverlap))
      {
        ++anArgIter;
      }
    }
    else if (anArg == "-replace")
    {
      aSelScheme = AIS_SelectionScheme_Replace;
    }
    else if (anArg == "-replaceextra")
    {
      aSelScheme = AIS_SelectionScheme_ReplaceExtra;
    }
    else if (anArg == "-xor"
          || anArg == "-shift")
    {
      aSelScheme = AIS_SelectionScheme_XOR;
    }
    else if (anArg == "-add")
    {
      aSelScheme = AIS_SelectionScheme_Add;
    }
    else if (anArg == "-remove")
    {
      aSelScheme = AIS_SelectionScheme_Remove;
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg.IsIntegerValue()
          && TCollection_AsciiString (theArgVec[anArgIter + 1]).IsIntegerValue())
    {
      const TCollection_AsciiString anArgNext (theArgVec[++anArgIter]);
      aPnts.Append (Graphic3d_Vec2i (anArg.IntegerValue(), anArgNext.IntegerValue()));
    }
    else if (anArgIter + 1 == theNbArgs
          && anArg.IsIntegerValue())
    {
      if (anArg.IntegerValue() == 1)
      {
        aSelScheme = AIS_SelectionScheme_XOR;
      }
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
      return 1;
    }
  }

  if (toAllowOverlap)
  {
    aCtx->MainSelector()->AllowOverlapDetection (toAllowOverlap);
  }

  Handle(ViewerTest_EventManager) aCurrentEventManager = ViewerTest::CurrentEventManager();
  if (aPnts.IsEmpty())
  {
    aCtx->SelectDetected (aSelScheme);
    aCtx->CurrentViewer()->Invalidate();
  }
  else if (aPnts.Length() == 2)
  {
    if (toAllowOverlap
     && aPnts.First().y() < aPnts.Last().y())
    {
      std::swap (aPnts.ChangeFirst(), aPnts.ChangeLast());
    }
    else if (!toAllowOverlap
           && aPnts.First().y() > aPnts.Last().y())
    {
      std::swap (aPnts.ChangeFirst(), aPnts.ChangeLast());
    }

    aCurrentEventManager->SelectInViewer (aPnts, aSelScheme);
  }
  else
  {
    aCurrentEventManager->SelectInViewer (aPnts, aSelScheme);
  }
  aCurrentEventManager->FlushViewEvents (aCtx, ViewerTest::CurrentView(), true);
  return 0;
}

//=======================================================================
//function : VMoveTo
//purpose  : Emulates cursor movement to defined pixel position
//=======================================================================
static Standard_Integer VMoveTo (Draw_Interpretor& theDI,
                                Standard_Integer theNbArgs,
                                const char**     theArgVec)
{
  const Handle(AIS_InteractiveContext)& aContext = ViewerTest::GetAISContext();
  const Handle(V3d_View)&               aView    = ViewerTest::CurrentView();
  if (aContext.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Graphic3d_Vec2i aMousePos (IntegerLast(), IntegerLast());
  for (Standard_Integer anArgIter = 1; anArgIter < theNbArgs; ++anArgIter)
  {
    TCollection_AsciiString anArgStr (theArgVec[anArgIter]);
    anArgStr.LowerCase();
    if (anArgStr == "-reset"
     || anArgStr == "-clear")
    {
      if (anArgIter + 1 < theNbArgs)
      {
        Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter + 1] << "'";
        return 1;
      }

      const Standard_Boolean toEchoGrid = aContext->CurrentViewer()->IsGridActive()
                                       && aContext->CurrentViewer()->GridEcho();
      if (toEchoGrid)
      {
        aContext->CurrentViewer()->HideGridEcho (aView);
      }
      if (aContext->ClearDetected() || toEchoGrid)
      {
        aContext->CurrentViewer()->RedrawImmediate();
      }
      return 0;
    }
    else if (aMousePos.x() == IntegerLast()
          && anArgStr.IsIntegerValue())
    {
      aMousePos.x() = anArgStr.IntegerValue();
    }
    else if (aMousePos.y() == IntegerLast()
          && anArgStr.IsIntegerValue())
    {
      aMousePos.y() = anArgStr.IntegerValue();
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }

  if (aMousePos.x() == IntegerLast()
   || aMousePos.y() == IntegerLast())
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }

  ViewerTest::CurrentEventManager()->ResetPreviousMoveTo();
  ViewerTest::CurrentEventManager()->UpdateMousePosition (aMousePos, Aspect_VKeyMouse_NONE, Aspect_VKeyFlags_NONE, false);
  ViewerTest::CurrentEventManager()->FlushViewEvents (ViewerTest::GetAISContext(), aView, true);

  gp_Pnt aTopPnt (RealLast(), RealLast(), RealLast());
  const Handle(SelectMgr_EntityOwner)& aDetOwner = aContext->DetectedOwner();
  for (Standard_Integer aDetIter = 1; aDetIter <= aContext->MainSelector()->NbPicked(); ++aDetIter)
  {
    if (aContext->MainSelector()->Picked (aDetIter) == aDetOwner)
    {
      aTopPnt = aContext->MainSelector()->PickedPoint (aDetIter);
      break;
    }
  }
  theDI << aTopPnt.X() << " " << aTopPnt.Y() << " " << aTopPnt.Z();
  return 0;
}

//=======================================================================
//function : VSelectByAxis
//purpose  :
//=======================================================================
static Standard_Integer VSelectByAxis (Draw_Interpretor& theDI,
                                       Standard_Integer theNbArgs,
                                       const char**     theArgVec)
{
  const Handle(AIS_InteractiveContext)& aContext = ViewerTest::GetAISContext();
  const Handle(V3d_View)&               aView    = ViewerTest::CurrentView();
  if (aContext.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  TCollection_AsciiString aName;
  gp_XYZ anAxisLocation(RealLast(), RealLast(), RealLast());
  gp_XYZ anAxisDirection(RealLast(), RealLast(), RealLast());
  Standard_Boolean isOnlyTop = true;
  Standard_Boolean toShowNormal = false;
  for (Standard_Integer anArgIter = 1; anArgIter < theNbArgs; ++anArgIter)
  {
    TCollection_AsciiString anArgStr (theArgVec[anArgIter]);
    anArgStr.LowerCase();
    if (anArgStr == "-display")
    {
      if (anArgIter + 1 >= theNbArgs)
      {
        Message::SendFail() << "Syntax error at argument '" << anArgStr << "'";
        return 1;
      }
      aName = theArgVec[++anArgIter];
    }
    else if (anArgStr == "-onlytop")
    {
      isOnlyTop = true;
      if (anArgIter + 1 < theNbArgs
        && Draw::ParseOnOff (theArgVec[anArgIter + 1], isOnlyTop))
      {
        ++anArgIter;
      }
    }
    else if (anArgStr == "-shownormal")
    {
      toShowNormal = true;
      if (anArgIter + 1 < theNbArgs
        && Draw::ParseOnOff (theArgVec[anArgIter + 1], toShowNormal))
      {
        ++anArgIter;
      }
    }
    else if (Precision::IsInfinite(anAxisLocation.X())
          && anArgStr.IsRealValue())
    {
      anAxisLocation.SetX (anArgStr.RealValue());
    }
    else if (Precision::IsInfinite(anAxisLocation.Y())
          && anArgStr.IsRealValue())
    {
      anAxisLocation.SetY (anArgStr.RealValue());
    }
    else if (Precision::IsInfinite(anAxisLocation.Z())
          && anArgStr.IsRealValue())
    {
      anAxisLocation.SetZ (anArgStr.RealValue());
    }
    else if (Precision::IsInfinite(anAxisDirection.X())
          && anArgStr.IsRealValue())
    {
      anAxisDirection.SetX (anArgStr.RealValue());
    }
    else if (Precision::IsInfinite(anAxisDirection.Y())
          && anArgStr.IsRealValue())
    {
      anAxisDirection.SetY (anArgStr.RealValue());
    }
    else if (Precision::IsInfinite(anAxisDirection.Z())
          && anArgStr.IsRealValue())
    {
      anAxisDirection.SetZ (anArgStr.RealValue());
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }

  if (Precision::IsInfinite (anAxisLocation.X()) ||
      Precision::IsInfinite (anAxisLocation.Y()) ||
      Precision::IsInfinite (anAxisLocation.Z()) ||
      Precision::IsInfinite (anAxisDirection.X()) ||
      Precision::IsInfinite (anAxisDirection.Y()) ||
      Precision::IsInfinite (anAxisDirection.Z()))
  {
    Message::SendFail() << "Invalid axis location and direction";
    return 1;
  }

  gp_Ax1 anAxis(anAxisLocation, anAxisDirection);
  gp_Pnt aTopPnt;
  if (!ViewerTest::CurrentEventManager()->PickAxis (aTopPnt, aContext, aView, anAxis))
  {
    theDI << "There are no any intersections with this axis.";
    return 0;
  }
  NCollection_Sequence<gp_Pnt> aPoints;
  NCollection_Sequence<Graphic3d_Vec3> aNormals;
  NCollection_Sequence<Standard_Real> aNormalLengths;
  for (Standard_Integer aPickIter = 1; aPickIter <= aContext->MainSelector()->NbPicked(); ++aPickIter)
  {
    const SelectMgr_SortCriterion& aPickedData = aContext->MainSelector()->PickedData (aPickIter);
    aPoints.Append (aPickedData.Point);
    aNormals.Append (aPickedData.Normal);
    Standard_Real aNormalLength = 1.0;
    if (!aPickedData.Entity.IsNull())
    {
      aNormalLength = 0.2 * aPickedData.Entity->BoundingBox().Size().maxComp();
    }
    aNormalLengths.Append (aNormalLength);
  }
  if (!aName.IsEmpty())
  {
    Standard_Boolean wasAuto = aContext->GetAutoActivateSelection();
    aContext->SetAutoActivateSelection (false);

    // Display axis
    Quantity_Color anAxisColor = Quantity_NOC_GREEN;
    Handle(Geom_Axis2Placement) anAx2Axis =
      new Geom_Axis2Placement (gp_Ax2(anAxisLocation, anAxisDirection));
    Handle(AIS_Axis) anAISAxis = new AIS_Axis (gp_Ax1 (anAxisLocation, anAxisDirection));
    anAISAxis->SetColor (anAxisColor);
    ViewerTest::Display (TCollection_AsciiString (aName) + "_axis", anAISAxis, false);

    // Display axis start point
    Handle(AIS_Point) anAISStartPnt = new AIS_Point (new Geom_CartesianPoint (anAxisLocation));
    anAISStartPnt->SetMarker (Aspect_TOM_O);
    anAISStartPnt->SetColor (anAxisColor);
    ViewerTest::Display (TCollection_AsciiString(aName) + "_start", anAISStartPnt, false);

    Standard_Integer anIndex = 0;
    for (NCollection_Sequence<gp_Pnt>::Iterator aPntIter(aPoints); aPntIter.More(); aPntIter.Next(), anIndex++)
    {
      const gp_Pnt& aPoint = aPntIter.Value();

      // Display normals in intersection points
      if (toShowNormal)
      {
        const Graphic3d_Vec3& aNormal = aNormals.Value (anIndex + 1);
        Standard_Real aNormalLength = aNormalLengths.Value (anIndex + 1);
        if (aNormal.SquareModulus() > ShortRealEpsilon())
        {
          gp_Dir aNormalDir ((Standard_Real)aNormal.x(), (Standard_Real)aNormal.y(), (Standard_Real)aNormal.z());
          Handle(AIS_Axis) anAISNormal = new AIS_Axis (gp_Ax1 (aPoint, aNormalDir), aNormalLength);
          anAISNormal->SetColor (Quantity_NOC_BLUE);
          anAISNormal->SetInfiniteState (false);
          ViewerTest::Display (TCollection_AsciiString(aName) + "_normal_" + anIndex, anAISNormal, false);
        }
      }

      // Display intersection points
      Handle(Geom_CartesianPoint) anIntersectPnt = new Geom_CartesianPoint (aPoint);
      Handle(AIS_Point) anAISIntersectPoint = new AIS_Point (anIntersectPnt);
      anAISIntersectPoint->SetMarker (Aspect_TOM_PLUS);
      anAISIntersectPoint->SetColor (Quantity_NOC_RED);
      ViewerTest::Display (TCollection_AsciiString(aName) + "_intersect_" + anIndex, anAISIntersectPoint, true);
    }

    aContext->SetAutoActivateSelection (wasAuto);
  }

  Standard_Integer anIndex = 0;
  for (NCollection_Sequence<gp_Pnt>::Iterator anIter(aPoints); anIter.More(); anIter.Next(), anIndex++)
  {
    const gp_Pnt& aPnt = anIter.Value();
    theDI << aPnt.X() << " " << aPnt.Y() << " " << aPnt.Z() << "\n";
  }
  return 0;
}

namespace
{
  //! Global map storing all animations registered in ViewerTest.
  static NCollection_DataMap<TCollection_AsciiString, Handle(AIS_Animation)> ViewerTest_AnimationTimelineMap;

  //! The animation calling the Draw Harness command.
  class ViewerTest_AnimationProc : public AIS_Animation
  {
  public:

    //! Main constructor.
    ViewerTest_AnimationProc (const TCollection_AsciiString& theAnimationName,
                              Draw_Interpretor* theDI,
                              const TCollection_AsciiString& theCommand)
    : AIS_Animation (theAnimationName),
      myDrawInter(theDI),
      myCommand  (theCommand)
    {
      //
    }

  protected:

    //! Evaluate the command.
    virtual void update (const AIS_AnimationProgress& theProgress) Standard_OVERRIDE
    {
      TCollection_AsciiString aCmd = myCommand;
      replace (aCmd, "%pts",             TCollection_AsciiString(theProgress.Pts));
      replace (aCmd, "%localpts",        TCollection_AsciiString(theProgress.LocalPts));
      replace (aCmd, "%ptslocal",        TCollection_AsciiString(theProgress.LocalPts));
      replace (aCmd, "%normalized",      TCollection_AsciiString(theProgress.LocalNormalized));
      replace (aCmd, "%localnormalized", TCollection_AsciiString(theProgress.LocalNormalized));
      myDrawInter->Eval (aCmd.ToCString());
    }

    //! Find the keyword in the command and replace it with value.
    //! @return the position of the keyword to pass value
    void replace (TCollection_AsciiString&       theCmd,
                  const TCollection_AsciiString& theKey,
                  const TCollection_AsciiString& theVal)
    {
      TCollection_AsciiString aCmd (theCmd);
      aCmd.LowerCase();
      const Standard_Integer aPos = aCmd.Search (theKey);
      if (aPos == -1)
      {
        return;
      }

      TCollection_AsciiString aPart1, aPart2;
      Standard_Integer aPart1To = aPos - 1;
      if (aPart1To >= 1
       && aPart1To <= theCmd.Length())
      {
        aPart1 = theCmd.SubString (1, aPart1To);
      }

      Standard_Integer aPart2From = aPos + theKey.Length();
      if (aPart2From >= 1
       && aPart2From <= theCmd.Length())
      {
        aPart2 = theCmd.SubString (aPart2From, theCmd.Length());
      }

      theCmd = aPart1 + theVal + aPart2;
    }

  protected:

    Draw_Interpretor*       myDrawInter;
    TCollection_AsciiString myCommand;

  };

  //! Replace the animation with the new one.
  static void replaceAnimation (const Handle(AIS_Animation)& theParentAnimation,
                                Handle(AIS_Animation)&       theAnimation,
                                const Handle(AIS_Animation)& theAnimationNew)
  {
    theAnimationNew->CopyFrom (theAnimation);
    if (!theParentAnimation.IsNull())
    {
      theParentAnimation->Replace (theAnimation, theAnimationNew);
    }
    else
    {
      ViewerTest_AnimationTimelineMap.UnBind (theAnimationNew->Name());
      ViewerTest_AnimationTimelineMap.Bind   (theAnimationNew->Name(), theAnimationNew);
    }
    theAnimation = theAnimationNew;
  }

  //! Parse the point.
  static Standard_Boolean parseXYZ (const char** theArgVec, gp_XYZ& thePnt)
  {
    const TCollection_AsciiString anXYZ[3] = { theArgVec[0], theArgVec[1], theArgVec[2] };
    if (!anXYZ[0].IsRealValue (Standard_True)
     || !anXYZ[1].IsRealValue (Standard_True)
     || !anXYZ[2].IsRealValue (Standard_True))
    {
      return Standard_False;
    }

    thePnt.SetCoord (anXYZ[0].RealValue(), anXYZ[1].RealValue(), anXYZ[2].RealValue());
    return Standard_True;
  }

  //! Parse the quaternion.
  static Standard_Boolean parseQuaternion (const char** theArgVec, gp_Quaternion& theQRot)
  {
    const TCollection_AsciiString anXYZW[4] = {theArgVec[0], theArgVec[1], theArgVec[2], theArgVec[3]};
    if (!anXYZW[0].IsRealValue (Standard_True)
     || !anXYZW[1].IsRealValue (Standard_True)
     || !anXYZW[2].IsRealValue (Standard_True)
     || !anXYZW[3].IsRealValue (Standard_True))
    {
      return Standard_False;
    }

    theQRot.Set (anXYZW[0].RealValue(), anXYZW[1].RealValue(), anXYZW[2].RealValue(), anXYZW[3].RealValue());
    return Standard_True;
  }

  //! Auxiliary class for flipping image upside-down.
  class ImageFlipper
  {
  public:

    //! Empty constructor.
    ImageFlipper() : myTmp (NCollection_BaseAllocator::CommonBaseAllocator()) {}

    //! Perform flipping.
    Standard_Boolean FlipY (Image_PixMap& theImage)
    {
      if (theImage.IsEmpty()
       || theImage.SizeX() == 0
       || theImage.SizeY() == 0)
      {
        return Standard_False;
      }

      const Standard_Size aRowSize = theImage.SizeRowBytes();
      if (myTmp.Size() < aRowSize
      && !myTmp.Allocate (aRowSize))
      {
        return Standard_False;
      }

      // for odd height middle row should be left as is
      Standard_Size aNbRowsHalf = theImage.SizeY() / 2;
      for (Standard_Size aRowT = 0, aRowB = theImage.SizeY() - 1; aRowT < aNbRowsHalf; ++aRowT, --aRowB)
      {
        Standard_Byte* aTop = theImage.ChangeRow (aRowT);
        Standard_Byte* aBot = theImage.ChangeRow (aRowB);
        memcpy (myTmp.ChangeData(), aTop,         aRowSize);
        memcpy (aTop,               aBot,         aRowSize);
        memcpy (aBot,               myTmp.Data(), aRowSize);
      }
      return Standard_True;
    }

  private:
    NCollection_Buffer myTmp;
  };

}

//=================================================================================================
//function : VViewParams
//purpose  : Gets or sets AIS View characteristics
//=================================================================================================
static int VViewParams (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean toSetProj     = Standard_False;
  Standard_Boolean toSetUp       = Standard_False;
  Standard_Boolean toSetAt       = Standard_False;
  Standard_Boolean toSetEye      = Standard_False;
  Standard_Boolean toSetScale    = Standard_False;
  Standard_Boolean toSetSize     = Standard_False;
  Standard_Boolean toSetCenter2d = Standard_False;
  Standard_Real    aViewScale = aView->Scale();
  Standard_Real    aViewAspect = aView->Camera()->Aspect();
  Standard_Real    aViewSize  = 1.0;
  Graphic3d_Vec2i  aCenter2d;
  gp_XYZ aViewProj, aViewUp, aViewAt, aViewEye;
  aView->Proj (aViewProj.ChangeCoord (1), aViewProj.ChangeCoord (2), aViewProj.ChangeCoord (3));
  aView->Up   (aViewUp  .ChangeCoord (1), aViewUp  .ChangeCoord (2), aViewUp  .ChangeCoord (3));
  aView->At   (aViewAt  .ChangeCoord (1), aViewAt  .ChangeCoord (2), aViewAt  .ChangeCoord (3));
  aView->Eye  (aViewEye .ChangeCoord (1), aViewEye .ChangeCoord (2), aViewEye .ChangeCoord (3));
  const Graphic3d_Mat4d& anOrientMat = aView->Camera()->OrientationMatrix();
  const Graphic3d_Mat4d& aProjMat = aView->Camera()->ProjectionMatrix();
  if (theArgsNb == 1)
  {
    // print all of the available view parameters
    char aText[4096];
    Sprintf (aText,
             "Scale:  %g\n"
             "Aspect: %g\n"
             "Proj:   %12g %12g %12g\n"
             "Up:     %12g %12g %12g\n"
             "At:     %12g %12g %12g\n"
             "Eye:    %12g %12g %12g\n"
             "OrientMat:    %12g %12g %12g %12g\n"
             "              %12g %12g %12g %12g\n"
             "              %12g %12g %12g %12g\n"
             "              %12g %12g %12g %12g\n"
             "ProjMat:      %12g %12g %12g %12g\n"
             "              %12g %12g %12g %12g\n"
             "              %12g %12g %12g %12g\n"
             "              %12g %12g %12g %12g\n",
              aViewScale, aViewAspect,
              aViewProj.X(), aViewProj.Y(), aViewProj.Z(),
              aViewUp.X(),   aViewUp.Y(),   aViewUp.Z(),
              aViewAt.X(),   aViewAt.Y(),   aViewAt.Z(),
              aViewEye.X(),  aViewEye.Y(),  aViewEye.Z(),
              anOrientMat.GetValue (0, 0), anOrientMat.GetValue (0, 1), anOrientMat.GetValue (0, 2), anOrientMat.GetValue (0, 3),
              anOrientMat.GetValue (1, 0), anOrientMat.GetValue (1, 1), anOrientMat.GetValue (1, 2), anOrientMat.GetValue (1, 3),
              anOrientMat.GetValue (2, 0), anOrientMat.GetValue (2, 1), anOrientMat.GetValue (2, 2), anOrientMat.GetValue (2, 3),
              anOrientMat.GetValue (3, 0), anOrientMat.GetValue (3, 1), anOrientMat.GetValue (3, 2), anOrientMat.GetValue (3, 3),
              aProjMat.GetValue (0, 0), aProjMat.GetValue (0, 1), aProjMat.GetValue (0, 2), aProjMat.GetValue (0, 3),
              aProjMat.GetValue (1, 0), aProjMat.GetValue (1, 1), aProjMat.GetValue (1, 2), aProjMat.GetValue (1, 3),
              aProjMat.GetValue (2, 0), aProjMat.GetValue (2, 1), aProjMat.GetValue (2, 2), aProjMat.GetValue (2, 3),
              aProjMat.GetValue (3, 0), aProjMat.GetValue (3, 1), aProjMat.GetValue (3, 2), aProjMat.GetValue (3, 3));
    theDi << aText;
    return 0;
  }

  ViewerTest_AutoUpdater anUpdateTool (ViewerTest::GetAISContext(), aView);
  for (Standard_Integer anArgIter = 1; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      continue;
    }
    else if (anArg == "-cmd"
          || anArg == "-command"
          || anArg == "-args")
    {
      char aText[4096];
      Sprintf (aText,
               "-scale %g "
               "-proj %g %g %g "
               "-up %g %g %g "
               "-at %g %g %g\n",
                aViewScale,
                aViewProj.X(), aViewProj.Y(), aViewProj.Z(),
                aViewUp.X(),   aViewUp.Y(),   aViewUp.Z(),
                aViewAt.X(),   aViewAt.Y(),   aViewAt.Z());
      theDi << aText;
    }
    else if (anArg == "-scale"
          || anArg == "-size")
    {
      if (anArgIter + 1 < theArgsNb
       && *theArgVec[anArgIter + 1] != '-')
      {
        const TCollection_AsciiString aValueArg (theArgVec[anArgIter + 1]);
        if (aValueArg.IsRealValue (Standard_True))
        {
          ++anArgIter;
          if (anArg == "-scale")
          {
            toSetScale = Standard_True;
            aViewScale = aValueArg.RealValue();
          }
          else if (anArg == "-size")
          {
            toSetSize = Standard_True;
            aViewSize = aValueArg.RealValue();
          }
          continue;
        }
      }
      if (anArg == "-scale")
      {
        theDi << "Scale: " << aView->Scale() << "\n";
      }
      else if (anArg == "-size")
      {
        Graphic3d_Vec2d aSizeXY;
        aView->Size (aSizeXY.x(), aSizeXY.y());
        theDi << "Size: " << aSizeXY.x() << " " << aSizeXY.y() << "\n";
      }
    }
    else if (anArg == "-eye"
          || anArg == "-at"
          || anArg == "-up"
          || anArg == "-proj")
    {
      if (anArgIter + 3 < theArgsNb)
      {
        gp_XYZ anXYZ;
        if (parseXYZ (theArgVec + anArgIter + 1, anXYZ))
        {
          anArgIter += 3;
          if (anArg == "-eye")
          {
            toSetEye = Standard_True;
            aViewEye = anXYZ;
          }
          else if (anArg == "-at")
          {
            toSetAt = Standard_True;
            aViewAt = anXYZ;
          }
          else if (anArg == "-up")
          {
            toSetUp = Standard_True;
            aViewUp = anXYZ;
          }
          else if (anArg == "-proj")
          {
            toSetProj = Standard_True;
            aViewProj = anXYZ;
          }
          continue;
        }
      }

      if (anArg == "-eye")
      {
        theDi << "Eye:  " << aViewEye.X() << " " << aViewEye.Y() << " " << aViewEye.Z() << "\n";
      }
      else if (anArg == "-at")
      {
        theDi << "At:   " << aViewAt.X() << " " << aViewAt.Y() << " " << aViewAt.Z() << "\n";
      }
      else if (anArg == "-up")
      {
        theDi << "Up:   " << aViewUp.X() << " " << aViewUp.Y() << " " << aViewUp.Z() << "\n";
      }
      else if (anArg == "-proj")
      {
        theDi << "Proj: " << aViewProj.X() << " " << aViewProj.Y() << " " << aViewProj.Z() << "\n";
      }
    }
    else if (anArg == "-center")
    {
      if (anArgIter + 2 < theArgsNb)
      {
        const TCollection_AsciiString anX (theArgVec[anArgIter + 1]);
        const TCollection_AsciiString anY (theArgVec[anArgIter + 2]);
        if (anX.IsIntegerValue()
         && anY.IsIntegerValue())
        {
          toSetCenter2d = Standard_True;
          aCenter2d = Graphic3d_Vec2i (anX.IntegerValue(), anY.IntegerValue());
        }
      }
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
      return 1;
    }
  }

  // change view parameters in proper order
  if (toSetScale)
  {
    aView->SetScale (aViewScale);
  }
  if (toSetSize)
  {
    aView->SetSize (aViewSize);
  }
  if (toSetEye)
  {
    aView->SetEye (aViewEye.X(), aViewEye.Y(), aViewEye.Z());
  }
  if (toSetAt)
  {
    aView->SetAt (aViewAt.X(), aViewAt.Y(), aViewAt.Z());
  }
  if (toSetProj)
  {
    aView->SetProj (aViewProj.X(), aViewProj.Y(), aViewProj.Z());
  }
  if (toSetUp)
  {
    aView->SetUp (aViewUp.X(), aViewUp.Y(), aViewUp.Z());
  }
  if (toSetCenter2d)
  {
    aView->SetCenter (aCenter2d.x(), aCenter2d.y());
  }

  return 0;
}

//==============================================================================
//function : V2DMode
//purpose  :
//==============================================================================
static Standard_Integer V2DMode (Draw_Interpretor&, Standard_Integer theArgsNb, const char** theArgVec)
{
  bool is2dMode = true;
  Handle(ViewerTest_V3dView) aV3dView = Handle(ViewerTest_V3dView)::DownCast (ViewerTest::CurrentView());
  if (aV3dView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }
  for (Standard_Integer anArgIt = 1; anArgIt < theArgsNb; ++anArgIt)
  {
    const TCollection_AsciiString anArg = theArgVec[anArgIt];
    TCollection_AsciiString anArgCase = anArg;
    anArgCase.LowerCase();
    if (anArgIt + 1 < theArgsNb
     && anArgCase == "-name")
    {
      ViewerTest_Names aViewNames (theArgVec[++anArgIt]);
      TCollection_AsciiString aViewName = aViewNames.GetViewName();
      if (!ViewerTest_myViews.IsBound1 (aViewName))
      {
        Message::SendFail() << "Syntax error: unknown view '" << theArgVec[anArgIt - 1] << "'";
        return 1;
      }
      aV3dView = Handle(ViewerTest_V3dView)::DownCast (ViewerTest_myViews.Find1 (aViewName));
    }
    else if (anArgCase == "-mode")
    {
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], is2dMode))
      {
        ++anArgIt;
      }
    }
    else if (Draw::ParseOnOff (theArgVec[anArgIt], is2dMode))
    {
      //
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument " << anArg;
      return 1;
    }
  }

  aV3dView->SetView2DMode (is2dMode);
  return 0;
}

//==============================================================================
//function : VAnimation
//purpose  :
//==============================================================================
static Standard_Integer VAnimation (Draw_Interpretor& theDI,
                                    Standard_Integer  theArgNb,
                                    const char**      theArgVec)
{
  Handle(AIS_InteractiveContext) aCtx = ViewerTest::GetAISContext();
  if (theArgNb < 2)
  {
    for (NCollection_DataMap<TCollection_AsciiString, Handle(AIS_Animation)>::Iterator
         anAnimIter (ViewerTest_AnimationTimelineMap); anAnimIter.More(); anAnimIter.Next())
    {
      theDI << anAnimIter.Key() << " " << anAnimIter.Value()->Duration() << " sec\n";
    }
    return 0;
  }
  if (aCtx.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Integer anArgIter = 1;
  TCollection_AsciiString aNameArg (theArgVec[anArgIter++]);
  if (aNameArg.IsEmpty())
  {
    Message::SendFail ("Syntax error: animation name is not defined");
    return 1;
  }

  TCollection_AsciiString aNameArgLower = aNameArg;
  aNameArgLower.LowerCase();
  if (aNameArgLower == "-reset"
   || aNameArgLower == "-clear")
  {
    ViewerTest_AnimationTimelineMap.Clear();
    return 0;
  }
  else if (aNameArg.Value (1) == '-')
  {
    Message::SendFail() << "Syntax error: invalid animation name '" << aNameArg  << "'";
    return 1;
  }

  const char* aNameSplitter = "/";
  Standard_Integer aSplitPos = aNameArg.Search (aNameSplitter);
  if (aSplitPos == -1)
  {
    aNameSplitter = ".";
    aSplitPos = aNameArg.Search (aNameSplitter);
  }

  // find existing or create a new animation by specified name within syntax "parent.child".
  Handle(AIS_Animation) aRootAnimation, aParentAnimation, anAnimation;
  for (; !aNameArg.IsEmpty();)
  {
    TCollection_AsciiString aNameParent;
    if (aSplitPos != -1)
    {
      if (aSplitPos == aNameArg.Length())
      {
        Message::SendFail ("Syntax error: animation name is not defined");
        return 1;
      }

      aNameParent = aNameArg.SubString (            1, aSplitPos - 1);
      aNameArg    = aNameArg.SubString (aSplitPos + 1, aNameArg.Length());

      aSplitPos = aNameArg.Search (aNameSplitter);
    }
    else
    {
      aNameParent = aNameArg;
      aNameArg.Clear();
    }

    if (anAnimation.IsNull())
    {
      if (!ViewerTest_AnimationTimelineMap.Find (aNameParent, anAnimation))
      {
        anAnimation = new AIS_Animation (aNameParent);
        ViewerTest_AnimationTimelineMap.Bind (aNameParent, anAnimation);
      }
      aRootAnimation = anAnimation;
    }
    else
    {
      aParentAnimation = anAnimation;
      anAnimation = aParentAnimation->Find (aNameParent);
      if (anAnimation.IsNull())
      {
        anAnimation = new AIS_Animation (aNameParent);
        aParentAnimation->Add (anAnimation);
      }
    }
  }

  if (anArgIter >= theArgNb)
  {
    // just print the list of children
    for (NCollection_Sequence<Handle(AIS_Animation)>::Iterator anAnimIter (anAnimation->Children()); anAnimIter.More(); anAnimIter.Next())
    {
      theDI << anAnimIter.Value()->Name() << " " << anAnimIter.Value()->Duration() << " sec\n";
    }
    return 0;
  }

  // animation parameters
  Standard_Boolean toPlay = Standard_False;
  Standard_Real aPlaySpeed     = 1.0;
  Standard_Real aPlayStartTime = anAnimation->StartPts();
  Standard_Real aPlayDuration  = anAnimation->Duration();
  Standard_Boolean isFreeCamera = Standard_False;
  Standard_Boolean isLockLoop   = Standard_False;

  // video recording parameters
  TCollection_AsciiString aRecFile;
  Image_VideoParams aRecParams;

  Handle(V3d_View) aView = ViewerTest::CurrentView();
  for (; anArgIter < theArgNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    // general options
    if (anArg == "-reset"
     || anArg == "-clear")
    {
      anAnimation->Clear();
    }
    else if (anArg == "-remove"
          || anArg == "-del"
          || anArg == "-delete")
    {
      if (!aParentAnimation.IsNull())
      {
        ViewerTest_AnimationTimelineMap.UnBind (anAnimation->Name());
      }
      else
      {
        aParentAnimation->Remove (anAnimation);
      }
    }
    // playback options
    else if (anArg == "-play")
    {
      toPlay = Standard_True;
      if (++anArgIter < theArgNb)
      {
        if (*theArgVec[anArgIter] == '-')
        {
          --anArgIter;
          continue;
        }
        aPlayStartTime = Draw::Atof (theArgVec[anArgIter]);

        if (++anArgIter < theArgNb)
        {
          if (*theArgVec[anArgIter] == '-')
          {
            --anArgIter;
            continue;
          }
          aPlayDuration = Draw::Atof (theArgVec[anArgIter]);
        }
      }
    }
    else if (anArg == "-resume")
    {
      toPlay = Standard_True;
      aPlayStartTime = anAnimation->ElapsedTime();
      if (++anArgIter < theArgNb)
      {
        if (*theArgVec[anArgIter] == '-')
        {
          --anArgIter;
          continue;
        }

        aPlayDuration = Draw::Atof (theArgVec[anArgIter]);
      }
    }
    else if (anArg == "-playspeed"
          || anArg == "-speed")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg << "";
        return 1;
      }
      aPlaySpeed = Draw::Atof (theArgVec[anArgIter]);
    }
    else if (anArg == "-lock"
          || anArg == "-lockloop"
          || anArg == "-playlockloop")
    {
      isLockLoop = Standard_True;
    }
    else if (anArg == "-freecamera"
          || anArg == "-playfreecamera"
          || anArg == "-freelook")
    {
      isFreeCamera = Standard_True;
    }
    // video recodring options
    else if (anArg == "-rec"
          || anArg == "-record")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      aRecFile = theArgVec[anArgIter];
      if (aRecParams.FpsNum <= 0)
      {
        aRecParams.FpsNum = 24;
      }

      if (anArgIter + 2 < theArgNb
      && *theArgVec[anArgIter + 1] != '-'
      && *theArgVec[anArgIter + 2] != '-')
      {
        TCollection_AsciiString aWidthArg  (theArgVec[anArgIter + 1]);
        TCollection_AsciiString aHeightArg (theArgVec[anArgIter + 2]);
        if (aWidthArg .IsIntegerValue()
         && aHeightArg.IsIntegerValue())
        {
          aRecParams.Width  = aWidthArg .IntegerValue();
          aRecParams.Height = aHeightArg.IntegerValue();
          anArgIter += 2;
        }
      }
    }
    else if (anArg == "-fps")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      TCollection_AsciiString aFpsArg (theArgVec[anArgIter]);
      Standard_Integer aSplitIndex = aFpsArg.FirstLocationInSet ("/", 1, aFpsArg.Length());
      if (aSplitIndex == 0)
      {
        aRecParams.FpsNum = aFpsArg.IntegerValue();
      }
      else
      {
        const TCollection_AsciiString aDenStr = aFpsArg.Split (aSplitIndex);
        aFpsArg.Split (aFpsArg.Length() - 1);
        const TCollection_AsciiString aNumStr = aFpsArg;
        aRecParams.FpsNum = aNumStr.IntegerValue();
        aRecParams.FpsDen = aDenStr.IntegerValue();
        if (aRecParams.FpsDen < 1)
        {
          Message::SendFail() << "Syntax error at " << anArg;
          return 1;
        }
      }
    }
    else if (anArg == "-format")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      aRecParams.Format = theArgVec[anArgIter];
    }
    else if (anArg == "-pix_fmt"
          || anArg == "-pixfmt"
          || anArg == "-pixelformat")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      aRecParams.PixelFormat = theArgVec[anArgIter];
    }
    else if (anArg == "-codec"
          || anArg == "-vcodec"
          || anArg == "-videocodec")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      aRecParams.VideoCodec = theArgVec[anArgIter];
    }
    else if (anArg == "-crf"
          || anArg == "-preset"
          || anArg == "-qp")
    {
      const TCollection_AsciiString aParamName = anArg.SubString (2, anArg.Length());
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      aRecParams.VideoCodecParams.Bind (aParamName, theArgVec[anArgIter]);
    }
    // animation definition options
    else if (anArg == "-start"
          || anArg == "-starttime"
          || anArg == "-startpts")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      anAnimation->SetStartPts (Draw::Atof (theArgVec[anArgIter]));
      aRootAnimation->UpdateTotalDuration();
    }
    else if (anArg == "-end"
          || anArg == "-endtime"
          || anArg == "-endpts")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      anAnimation->SetOwnDuration (Draw::Atof (theArgVec[anArgIter]) - anAnimation->StartPts());
      aRootAnimation->UpdateTotalDuration();
    }
    else if (anArg == "-dur"
          || anArg == "-duration")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      anAnimation->SetOwnDuration (Draw::Atof (theArgVec[anArgIter]));
      aRootAnimation->UpdateTotalDuration();
    }
    else if (anArg == "-command"
          || anArg == "-cmd"
          || anArg == "-invoke"
          || anArg == "-eval"
          || anArg == "-proc")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      Handle(ViewerTest_AnimationProc) aCmdAnimation = new ViewerTest_AnimationProc (anAnimation->Name(), &theDI, theArgVec[anArgIter]);
      replaceAnimation (aParentAnimation, anAnimation, aCmdAnimation);
    }
    else if (anArg == "-objecttrsf"
          || anArg == "-objectransformation"
          || anArg == "-objtransformation"
          || anArg == "-objtrsf"
          || anArg == "-object"
          || anArg == "-obj")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }

      TCollection_AsciiString anObjName (theArgVec[anArgIter]);
      const ViewerTest_DoubleMapOfInteractiveAndName& aMapOfAIS = GetMapOfAIS();
      Handle(AIS_InteractiveObject) anObject;
      if (!aMapOfAIS.Find2 (anObjName, anObject))
      {
        Message::SendFail() << "Syntax error: wrong object name at " << anArg;
        return 1;
      }

      gp_Trsf       aTrsfs   [2] = { anObject->LocalTransformation(), anObject->LocalTransformation() };
      gp_Quaternion aRotQuats[2] = { aTrsfs[0].GetRotation(),         aTrsfs[1].GetRotation() };
      gp_XYZ        aLocPnts [2] = { aTrsfs[0].TranslationPart(),     aTrsfs[1].TranslationPart() };
      Standard_Real aScales  [2] = { aTrsfs[0].ScaleFactor(),         aTrsfs[1].ScaleFactor() };
      Standard_Boolean isTrsfSet = Standard_False;
      Standard_Integer aTrsfArgIter = anArgIter + 1;
      for (; aTrsfArgIter < theArgNb; ++aTrsfArgIter)
      {
        TCollection_AsciiString aTrsfArg (theArgVec[aTrsfArgIter]);
        aTrsfArg.LowerCase();
        const Standard_Integer anIndex = aTrsfArg.EndsWith ("1") ? 0 : 1;
        if (aTrsfArg.StartsWith ("-rotation")
         || aTrsfArg.StartsWith ("-rot"))
        {
          isTrsfSet = Standard_True;
          if (aTrsfArgIter + 4 >= theArgNb
          || !parseQuaternion (theArgVec + aTrsfArgIter + 1, aRotQuats[anIndex]))
          {
            Message::SendFail() << "Syntax error at " << aTrsfArg;
            return 1;
          }
          aTrsfArgIter += 4;
        }
        else if (aTrsfArg.StartsWith ("-location")
              || aTrsfArg.StartsWith ("-loc"))
        {
          isTrsfSet = Standard_True;
          if (aTrsfArgIter + 3 >= theArgNb
          || !parseXYZ (theArgVec + aTrsfArgIter + 1, aLocPnts[anIndex]))
          {
            Message::SendFail() << "Syntax error at " << aTrsfArg;
            return 1;
          }
          aTrsfArgIter += 3;
        }
        else if (aTrsfArg.StartsWith ("-scale"))
        {
          isTrsfSet = Standard_True;
          if (++aTrsfArgIter >= theArgNb)
          {
            Message::SendFail() << "Syntax error at " << aTrsfArg;
            return 1;
          }

          const TCollection_AsciiString aScaleStr (theArgVec[aTrsfArgIter]);
          if (!aScaleStr.IsRealValue (Standard_True))
          {
            Message::SendFail() << "Syntax error at " << aTrsfArg;
            return 1;
          }
          aScales[anIndex] = aScaleStr.RealValue();
        }
        else
        {
          anArgIter = aTrsfArgIter - 1;
          break;
        }
      }
      if (!isTrsfSet)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      else if (aTrsfArgIter >= theArgNb)
      {
        anArgIter = theArgNb;
      }

      aTrsfs[0].SetRotation        (aRotQuats[0]);
      aTrsfs[1].SetRotation        (aRotQuats[1]);
      aTrsfs[0].SetTranslationPart (aLocPnts[0]);
      aTrsfs[1].SetTranslationPart (aLocPnts[1]);
      aTrsfs[0].SetScaleFactor     (aScales[0]);
      aTrsfs[1].SetScaleFactor     (aScales[1]);

      Handle(AIS_AnimationObject) anObjAnimation = new AIS_AnimationObject (anAnimation->Name(), aCtx, anObject, aTrsfs[0], aTrsfs[1]);
      replaceAnimation (aParentAnimation, anAnimation, anObjAnimation);
    }
    else if (anArg == "-viewtrsf"
          || anArg == "-view")
    {
      Handle(AIS_AnimationCamera) aCamAnimation = Handle(AIS_AnimationCamera)::DownCast (anAnimation);
      if (aCamAnimation.IsNull())
      {
        aCamAnimation = new AIS_AnimationCamera (anAnimation->Name(), aView);
        replaceAnimation (aParentAnimation, anAnimation, aCamAnimation);
      }

      Handle(Graphic3d_Camera) aCams[2] =
      {
        new Graphic3d_Camera (aCamAnimation->View()->Camera()),
        new Graphic3d_Camera (aCamAnimation->View()->Camera())
      };

      Standard_Boolean isTrsfSet = Standard_False;
      Standard_Integer aViewArgIter = anArgIter + 1;
      for (; aViewArgIter < theArgNb; ++aViewArgIter)
      {
        TCollection_AsciiString aViewArg (theArgVec[aViewArgIter]);
        aViewArg.LowerCase();
        const Standard_Integer anIndex = aViewArg.EndsWith("1") ? 0 : 1;
        if (aViewArg.StartsWith ("-scale"))
        {
          isTrsfSet = Standard_True;
          if (++aViewArgIter >= theArgNb)
          {
            Message::SendFail() << "Syntax error at " << anArg;
            return 1;
          }

          const TCollection_AsciiString aScaleStr (theArgVec[aViewArgIter]);
          if (!aScaleStr.IsRealValue (Standard_True))
          {
            Message::SendFail() << "Syntax error at " << aViewArg;
            return 1;
          }
          Standard_Real aScale = aScaleStr.RealValue();
          aScale = aCamAnimation->View()->DefaultCamera()->Scale() / aScale;
          aCams[anIndex]->SetScale (aScale);
        }
        else if (aViewArg.StartsWith ("-eye")
              || aViewArg.StartsWith ("-center")
              || aViewArg.StartsWith ("-at")
              || aViewArg.StartsWith ("-up"))
        {
          isTrsfSet = Standard_True;
          gp_XYZ anXYZ;
          if (aViewArgIter + 3 >= theArgNb
          || !parseXYZ (theArgVec + aViewArgIter + 1, anXYZ))
          {
            Message::SendFail() << "Syntax error at " << aViewArg;
            return 1;
          }
          aViewArgIter += 3;

          if (aViewArg.StartsWith ("-eye"))
          {
            aCams[anIndex]->SetEye (anXYZ);
          }
          else if (aViewArg.StartsWith ("-center")
                || aViewArg.StartsWith ("-at"))
          {
            aCams[anIndex]->SetCenter (anXYZ);
          }
          else if (aViewArg.StartsWith ("-up"))
          {
            aCams[anIndex]->SetUp (anXYZ);
          }
        }
        else
        {
          anArgIter = aViewArgIter - 1;
          break;
        }
      }
      if (!isTrsfSet)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      else if (aViewArgIter >= theArgNb)
      {
        anArgIter = theArgNb;
      }

      aCamAnimation->SetCameraStart(aCams[0]);
      aCamAnimation->SetCameraEnd  (aCams[1]);
    }
    else
    {
      Message::SendFail() << "Syntax error at " << anArg;
      return 1;
    }
  }

  if (!toPlay && aRecFile.IsEmpty())
  {
    return 0;
  }

  // Start animation timeline and process frame updating.
  TheIsAnimating = Standard_True;
  const Standard_Boolean wasImmediateUpdate = aView->SetImmediateUpdate (Standard_False);
  Handle(Graphic3d_Camera) aCameraBack = new Graphic3d_Camera (aView->Camera());
  anAnimation->StartTimer (aPlayStartTime, aPlaySpeed, Standard_True, aPlayDuration <= 0.0);
  if (isFreeCamera)
  {
    aView->Camera()->Copy (aCameraBack);
  }

  const Standard_Real anUpperPts = aPlayStartTime + aPlayDuration;
  if (aRecParams.FpsNum <= 0)
  {
    while (!anAnimation->IsStopped())
    {
      aCameraBack->Copy (aView->Camera());
      const Standard_Real aPts = anAnimation->UpdateTimer();
      if (isFreeCamera)
      {
        aView->Camera()->Copy (aCameraBack);
      }

      if (aPts >= anUpperPts)
      {
        anAnimation->Pause();
        break;
      }

      if (aView->IsInvalidated())
      {
        aView->Redraw();
      }
      else
      {
        aView->RedrawImmediate();
      }

      if (!isLockLoop)
      {
        // handle user events
        theDI.Eval ("after 1 set waiter 1");
        theDI.Eval ("vwait waiter");
      }
      if (!TheIsAnimating)
      {
        anAnimation->Pause();
        theDI << aPts;
        break;
      }
    }

    if (aView->IsInvalidated())
    {
      aView->Redraw();
    }
    else
    {
      aView->RedrawImmediate();
    }
  }
  else
  {
    OSD_Timer aPerfTimer;
    aPerfTimer.Start();

    Handle(Image_VideoRecorder) aRecorder;
    ImageFlipper aFlipper;
    Handle(Draw_ProgressIndicator) aProgress;
    if (!aRecFile.IsEmpty())
    {
      if (aRecParams.Width  <= 0
       || aRecParams.Height <= 0)
      {
        aView->Window()->Size (aRecParams.Width, aRecParams.Height);
      }

      aRecorder = new Image_VideoRecorder();
      if (!aRecorder->Open (aRecFile.ToCString(), aRecParams))
      {
        Message::SendFail ("Error: failed to open video file for recording");
        return 0;
      }

      aProgress = new Draw_ProgressIndicator (theDI, 1);
    }

    // Manage frame-rated animation here
    Standard_Real aPts = aPlayStartTime;
    int64_t aNbFrames = 0;
    Message_ProgressScope aPS(Message_ProgressIndicator::Start(aProgress),
                              "Video recording, sec", Max(1, Standard_Integer(aPlayDuration / aPlaySpeed)));
    Standard_Integer aSecondsProgress = 0;
    for (; aPts <= anUpperPts && aPS.More();)
    {
      const Standard_Real aRecPts = aPlaySpeed * ((Standard_Real(aRecParams.FpsDen) / Standard_Real(aRecParams.FpsNum)) * Standard_Real(aNbFrames));
      aPts = aPlayStartTime + aRecPts;
      ++aNbFrames;
      if (!anAnimation->Update (aPts))
      {
        break;
      }

      if (!aRecorder.IsNull())
      {
        V3d_ImageDumpOptions aDumpParams;
        aDumpParams.Width          = aRecParams.Width;
        aDumpParams.Height         = aRecParams.Height;
        aDumpParams.BufferType     = Graphic3d_BT_RGBA;
        aDumpParams.StereoOptions  = V3d_SDO_MONO;
        aDumpParams.ToAdjustAspect = Standard_True;
        if (!aView->ToPixMap (aRecorder->ChangeFrame(), aDumpParams))
        {
          Message::SendFail ("Error: view dump is failed");
          return 0;
        }
        aFlipper.FlipY (aRecorder->ChangeFrame());
        if (!aRecorder->PushFrame())
        {
          return 0;
        }
      }
      else
      {
        aView->Redraw();
      }

      while (aSecondsProgress < Standard_Integer(aRecPts / aPlaySpeed))
      {
        aPS.Next();
        ++aSecondsProgress;
      }
    }

    aPerfTimer.Stop();
    anAnimation->Stop();
    const Standard_Real aRecFps = Standard_Real(aNbFrames) / aPerfTimer.ElapsedTime();
    theDI << "Average FPS: " << aRecFps << "\n"
          << "Nb. Frames: "  << Standard_Real(aNbFrames);

    aView->Redraw();
  }

  aView->SetImmediateUpdate (wasImmediateUpdate);
  TheIsAnimating = Standard_False;
  return 0;
}


//=======================================================================
//function : VChangeSelected
//purpose  : Adds the shape to selection or remove one from it
//=======================================================================
static Standard_Integer VChangeSelected (Draw_Interpretor& di,
                                Standard_Integer argc,
                                const char ** argv)
{
  if(argc != 2)
  {
    di<<"Usage : " << argv[0] << " shape \n";
    return 1;
  }
  //get AIS_Shape:
  TCollection_AsciiString aName(argv[1]);
  Handle(AIS_InteractiveObject) anAISObject;
  if (!GetMapOfAIS().Find2 (aName, anAISObject)
    || anAISObject.IsNull())
  {
    di<<"Use 'vdisplay' before";
    return 1;
  }

  ViewerTest::GetAISContext()->AddOrRemoveSelected(anAISObject, Standard_True);
  return 0;
}

//=======================================================================
//function : VNbSelected
//purpose  : Returns number of selected objects
//=======================================================================
static Standard_Integer VNbSelected (Draw_Interpretor& di,
                                Standard_Integer argc,
                                const char ** argv)
{
  if(argc != 1)
  {
    di << "Usage : " << argv[0] << "\n";
    return 1;
  }
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  if(aContext.IsNull())
  {
    di << "use 'vinit' command before " << argv[0] << "\n";
    return 1;
  }
  di << aContext->NbSelected() << "\n";
  return 0;
}

//=======================================================================
//function : VSetViewSize
//purpose  :
//=======================================================================
static Standard_Integer VSetViewSize (Draw_Interpretor& di,
                                Standard_Integer argc,
                                const char ** argv)
{
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  if(aContext.IsNull())
  {
    di << "use 'vinit' command before " << argv[0] << "\n";
    return 1;
  }
  if(argc != 2)
  {
    di<<"Usage : " << argv[0] << " Size\n";
    return 1;
  }
  Standard_Real aSize = Draw::Atof (argv[1]);
  if (aSize <= 0.)
  {
    di<<"Bad Size value  : " << aSize << "\n";
    return 1;
  }

  Handle(V3d_View) aView = ViewerTest::CurrentView();
  aView->SetSize(aSize);
  return 0;
}

//=======================================================================
//function : VMoveView
//purpose  :
//=======================================================================
static Standard_Integer VMoveView (Draw_Interpretor& di,
                                Standard_Integer argc,
                                const char ** argv)
{
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  if(aContext.IsNull())
  {
    di << "use 'vinit' command before " << argv[0] << "\n";
    return 1;
  }
  if(argc < 4 || argc > 5)
  {
    di<<"Usage : " << argv[0] << " Dx Dy Dz [Start = 1|0]\n";
    return 1;
  }
  Standard_Real Dx = Draw::Atof (argv[1]);
  Standard_Real Dy = Draw::Atof (argv[2]);
  Standard_Real Dz = Draw::Atof (argv[3]);
  Standard_Boolean aStart = Standard_True;
  if (argc == 5)
  {
      aStart = (Draw::Atoi (argv[4]) > 0);
  }

  Handle(V3d_View) aView = ViewerTest::CurrentView();
  aView->Move(Dx,Dy,Dz,aStart);
  return 0;
}

//=======================================================================
//function : VTranslateView
//purpose  :
//=======================================================================
static Standard_Integer VTranslateView (Draw_Interpretor& di,
                                Standard_Integer argc,
                                const char ** argv)
{
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  if(aContext.IsNull())
  {
    di << "use 'vinit' command before " << argv[0] << "\n";
    return 1;
  }
  if(argc < 4 || argc > 5)
  {
    di<<"Usage : " << argv[0] << " Dx Dy Dz [Start = 1|0]\n";
    return 1;
  }
  Standard_Real Dx = Draw::Atof (argv[1]);
  Standard_Real Dy = Draw::Atof (argv[2]);
  Standard_Real Dz = Draw::Atof (argv[3]);
  Standard_Boolean aStart = Standard_True;
  if (argc == 5)
  {
      aStart = (Draw::Atoi (argv[4]) > 0);
  }

  Handle(V3d_View) aView = ViewerTest::CurrentView();
  aView->Translate(Dx,Dy,Dz,aStart);
  return 0;
}

//=======================================================================
//function : VTurnView
//purpose  :
//=======================================================================
static Standard_Integer VTurnView (Draw_Interpretor& di,
                                Standard_Integer argc,
                                const char ** argv)
{
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  if(aContext.IsNull()) {
    di << "use 'vinit' command before " << argv[0] << "\n";
    return 1;
  }
  if(argc < 4 || argc > 5){
    di<<"Usage : " << argv[0] << " Ax Ay Az [Start = 1|0]\n";
    return 1;
  }
  Standard_Real Ax = Draw::Atof (argv[1]);
  Standard_Real Ay = Draw::Atof (argv[2]);
  Standard_Real Az = Draw::Atof (argv[3]);
  Standard_Boolean aStart = Standard_True;
  if (argc == 5)
  {
      aStart = (Draw::Atoi (argv[4]) > 0);
  }

  Handle(V3d_View) aView = ViewerTest::CurrentView();
  aView->Turn(Ax,Ay,Az,aStart);
  return 0;
}

//==============================================================================
//function : VTextureEnv
//purpose  : ENables or disables environment mapping
//==============================================================================
class OCC_TextureEnv : public Graphic3d_TextureEnv
{
public:
  OCC_TextureEnv(const Standard_CString FileName);
  OCC_TextureEnv(const Graphic3d_NameOfTextureEnv aName);
  void SetTextureParameters(const Standard_Boolean theRepeatFlag,
                            const Standard_Boolean theModulateFlag,
                            const Graphic3d_TypeOfTextureFilter theFilter,
                            const Standard_ShortReal theXScale,
                            const Standard_ShortReal theYScale,
                            const Standard_ShortReal theXShift,
                            const Standard_ShortReal theYShift,
                            const Standard_ShortReal theAngle);
  DEFINE_STANDARD_RTTI_INLINE(OCC_TextureEnv,Graphic3d_TextureEnv)
};
DEFINE_STANDARD_HANDLE(OCC_TextureEnv, Graphic3d_TextureEnv)

OCC_TextureEnv::OCC_TextureEnv(const Standard_CString theFileName)
  : Graphic3d_TextureEnv(theFileName)
{
}

OCC_TextureEnv::OCC_TextureEnv(const Graphic3d_NameOfTextureEnv theTexId)
  : Graphic3d_TextureEnv(theTexId)
{
}

void OCC_TextureEnv::SetTextureParameters(const Standard_Boolean theRepeatFlag,
                                          const Standard_Boolean theModulateFlag,
                                          const Graphic3d_TypeOfTextureFilter theFilter,
                                          const Standard_ShortReal theXScale,
                                          const Standard_ShortReal theYScale,
                                          const Standard_ShortReal theXShift,
                                          const Standard_ShortReal theYShift,
                                          const Standard_ShortReal theAngle)
{
  myParams->SetRepeat     (theRepeatFlag);
  myParams->SetModulate   (theModulateFlag);
  myParams->SetFilter     (theFilter);
  myParams->SetScale      (Graphic3d_Vec2(theXScale, theYScale));
  myParams->SetTranslation(Graphic3d_Vec2(theXShift, theYShift));
  myParams->SetRotation   (theAngle);
}

static int VTextureEnv (Draw_Interpretor& /*theDI*/, Standard_Integer theArgNb, const char** theArgVec)
{
  // get the active view
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  // Checking the input arguments
  Standard_Boolean anEnableFlag = Standard_False;
  Standard_Boolean isOk         = theArgNb >= 2;
  if (isOk)
  {
    TCollection_AsciiString anEnableOpt(theArgVec[1]);
    anEnableFlag = anEnableOpt.IsEqual("on");
    isOk         = anEnableFlag || anEnableOpt.IsEqual("off");
  }
  if (anEnableFlag)
  {
    isOk = (theArgNb == 3 || theArgNb == 11);
    if (isOk)
    {
      TCollection_AsciiString aTextureOpt(theArgVec[2]);
      isOk = (!aTextureOpt.IsIntegerValue() ||
             (aTextureOpt.IntegerValue() >= 0 && aTextureOpt.IntegerValue() < Graphic3d_NOT_ENV_UNKNOWN));

      if (isOk && theArgNb == 11)
      {
        TCollection_AsciiString aRepeatOpt  (theArgVec[3]),
                                aModulateOpt(theArgVec[4]),
                                aFilterOpt  (theArgVec[5]),
                                aSScaleOpt  (theArgVec[6]),
                                aTScaleOpt  (theArgVec[7]),
                                aSTransOpt  (theArgVec[8]),
                                aTTransOpt  (theArgVec[9]),
                                anAngleOpt  (theArgVec[10]);
        isOk = ((aRepeatOpt.  IsEqual("repeat")   || aRepeatOpt.  IsEqual("clamp")) &&
                (aModulateOpt.IsEqual("modulate") || aModulateOpt.IsEqual("decal")) &&
                (aFilterOpt.  IsEqual("nearest")  || aFilterOpt.  IsEqual("bilinear") || aFilterOpt.IsEqual("trilinear")) &&
                aSScaleOpt.IsRealValue (Standard_True) && aTScaleOpt.IsRealValue (Standard_True) &&
                aSTransOpt.IsRealValue (Standard_True) && aTTransOpt.IsRealValue (Standard_True) &&
                anAngleOpt.IsRealValue (Standard_True));
      }
    }
  }

  if (!isOk)
  {
    Message::SendFail() << "Usage:\n"
                        << theArgVec[0] << " off\n"
                        << theArgVec[0] << " on {index_of_std_texture(0..7)|texture_file_name} [{clamp|repeat} {decal|modulate} {nearest|bilinear|trilinear} scale_s scale_t translation_s translation_t rotation_degrees]";
    return 1;
  }

  if (anEnableFlag)
  {
    TCollection_AsciiString aTextureOpt(theArgVec[2]);
    Handle(OCC_TextureEnv) aTexEnv = aTextureOpt.IsIntegerValue() ?
                                     new OCC_TextureEnv((Graphic3d_NameOfTextureEnv)aTextureOpt.IntegerValue()) :
                                     new OCC_TextureEnv(theArgVec[2]);

    if (theArgNb == 11)
    {
      TCollection_AsciiString aRepeatOpt(theArgVec[3]), aModulateOpt(theArgVec[4]), aFilterOpt(theArgVec[5]);
      aTexEnv->SetTextureParameters(
        aRepeatOpt.  IsEqual("repeat"),
        aModulateOpt.IsEqual("modulate"),
        aFilterOpt.  IsEqual("nearest") ? Graphic3d_TOTF_NEAREST :
                                          aFilterOpt.IsEqual("bilinear") ? Graphic3d_TOTF_BILINEAR :
                                                                           Graphic3d_TOTF_TRILINEAR,
        (Standard_ShortReal)Draw::Atof(theArgVec[6]),
        (Standard_ShortReal)Draw::Atof(theArgVec[7]),
        (Standard_ShortReal)Draw::Atof(theArgVec[8]),
        (Standard_ShortReal)Draw::Atof(theArgVec[9]),
        (Standard_ShortReal)Draw::Atof(theArgVec[10])
        );
    }
    aView->SetTextureEnv(aTexEnv);
  }
  else // Disabling environment mapping
  {
    Handle(Graphic3d_TextureEnv) aTexture;
    aView->SetTextureEnv(aTexture); // Passing null handle to clear the texture data
  }

  aView->Redraw();
  return 0;
}

namespace
{
  typedef NCollection_DataMap<TCollection_AsciiString, Handle(Graphic3d_ClipPlane)> MapOfPlanes;

  //! Remove registered clipping plane from all views and objects.
  static void removePlane (MapOfPlanes& theRegPlanes,
                           const TCollection_AsciiString& theName)
  {
    Handle(Graphic3d_ClipPlane) aClipPlane;
    if (!theRegPlanes.Find (theName, aClipPlane))
    {
      Message::SendWarning ("Warning: no such plane");
      return;
    }

    theRegPlanes.UnBind (theName);
    for (ViewerTest_DoubleMapIteratorOfDoubleMapOfInteractiveAndName anIObjIt (GetMapOfAIS());
         anIObjIt.More(); anIObjIt.Next())
    {
      const Handle(AIS_InteractiveObject)& aPrs = anIObjIt.Key1();
      aPrs->RemoveClipPlane (aClipPlane);
    }

    for (NCollection_DoubleMap<TCollection_AsciiString, Handle(V3d_View)>::Iterator aViewIt(ViewerTest_myViews);
         aViewIt.More(); aViewIt.Next())
    {
      const Handle(V3d_View)& aView = aViewIt.Key2();
      aView->RemoveClipPlane(aClipPlane);
    }

    ViewerTest::RedrawAllViews();
  }
}

//===============================================================================================
//function : VClipPlane
//purpose  :
//===============================================================================================
static int VClipPlane (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  // use short-cut for created clip planes map of created (or "registered by name") clip planes
  static MapOfPlanes aRegPlanes;

  if (theArgsNb < 2)
  {
    for (MapOfPlanes::Iterator aPlaneIter (aRegPlanes); aPlaneIter.More(); aPlaneIter.Next())
    {
      theDi << aPlaneIter.Key() << " ";
    }
    return 0;
  }

  TCollection_AsciiString aCommand (theArgVec[1]);
  aCommand.LowerCase();
  const Handle(V3d_View)& anActiveView = ViewerTest::CurrentView();
  if (anActiveView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  // print maximum number of planes for current viewer
  if (aCommand == "-maxplanes"
   || aCommand == "maxplanes")
  {
    theDi << anActiveView->Viewer()->Driver()->InquirePlaneLimit()
          << " plane slots provided by driver.\n";
    return 0;
  }

  // create / delete plane instance
  if (aCommand == "-create"
   || aCommand == "create"
   || aCommand == "-delete"
   || aCommand == "delete"
   || aCommand == "-clone"
   || aCommand == "clone")
  {
    if (theArgsNb < 3)
    {
      Message::SendFail ("Syntax error: plane name is required");
      return 1;
    }

    Standard_Boolean toCreate = aCommand == "-create"
                             || aCommand == "create";
    Standard_Boolean toClone  = aCommand == "-clone"
                             || aCommand == "clone";
    Standard_Boolean toDelete = aCommand == "-delete"
                             || aCommand == "delete";
    TCollection_AsciiString aPlane (theArgVec[2]);

    if (toCreate)
    {
      if (aRegPlanes.IsBound (aPlane))
      {
        std::cout << "Warning: existing plane has been overridden.\n";
        toDelete = true;
      }
      else
      {
        aRegPlanes.Bind (aPlane, new Graphic3d_ClipPlane());
        return 0;
      }
    }
    else if (toClone) // toClone
    {
      if (!aRegPlanes.IsBound (aPlane))
      {
        Message::SendFail ("Error: no such plane");
        return 1;
      }
      else if (theArgsNb < 4)
      {
        Message::SendFail ("Syntax error: enter name for new plane");
        return 1;
      }

      TCollection_AsciiString aClone (theArgVec[3]);
      if (aRegPlanes.IsBound (aClone))
      {
        Message::SendFail ("Error: plane name is in use");
        return 1;
      }

      const Handle(Graphic3d_ClipPlane)& aClipPlane = aRegPlanes.Find (aPlane);

      aRegPlanes.Bind (aClone, aClipPlane->Clone());
      return 0;
    }

    if (toDelete)
    {
      if (aPlane == "ALL"
       || aPlane == "all"
       || aPlane == "*")
      {
        for (MapOfPlanes::Iterator aPlaneIter (aRegPlanes); aPlaneIter.More();)
        {
          aPlane = aPlaneIter.Key();
          removePlane (aRegPlanes, aPlane);
          aPlaneIter = MapOfPlanes::Iterator (aRegPlanes);
        }
      }
      else
      {
        removePlane (aRegPlanes, aPlane);
      }
    }

    if (toCreate)
    {
      aRegPlanes.Bind (aPlane, new Graphic3d_ClipPlane());
    }
    return 0;
  }

  // set / unset plane command
  if (aCommand == "set"
   || aCommand == "unset")
  {
    if (theArgsNb < 5)
    {
      Message::SendFail ("Syntax error: need more arguments");
      return 1;
    }

    // redirect to new syntax
    NCollection_Array1<const char*> anArgVec (1, theArgsNb - 1);
    anArgVec.SetValue (1, theArgVec[0]);
    anArgVec.SetValue (2, theArgVec[2]);
    anArgVec.SetValue (3, aCommand == "set" ? "-set" : "-unset");
    for (Standard_Integer anIt = 4; anIt < theArgsNb; ++anIt)
    {
      anArgVec.SetValue (anIt, theArgVec[anIt]);
    }

    return VClipPlane (theDi, anArgVec.Length(), &anArgVec.ChangeFirst());
  }

  // change plane command
  TCollection_AsciiString aPlaneName;
  Handle(Graphic3d_ClipPlane) aClipPlane;
  Standard_Integer anArgIter = 0;
  if (aCommand == "-change"
   || aCommand == "change")
  {
    // old syntax support
    if (theArgsNb < 3)
    {
      Message::SendFail ("Syntax error: need more arguments");
      return 1;
    }

    anArgIter  = 3;
    aPlaneName = theArgVec[2];
    if (!aRegPlanes.Find (aPlaneName, aClipPlane))
    {
      Message::SendFail() << "Error: no such plane '" << aPlaneName << "'";
      return 1;
    }
  }
  else if (aRegPlanes.Find (theArgVec[1], aClipPlane))
  {
    anArgIter  = 2;
    aPlaneName = theArgVec[1];
  }
  else
  {
    anArgIter  = 2;
    aPlaneName = theArgVec[1];
    aClipPlane = new Graphic3d_ClipPlane();
    aRegPlanes.Bind (aPlaneName, aClipPlane);
    theDi << "Created new plane " << aPlaneName << ".\n";
  }

  if (theArgsNb - anArgIter < 1)
  {
    Message::SendFail ("Syntax error: need more arguments");
    return 1;
  }

  for (; anArgIter < theArgsNb; ++anArgIter)
  {
    const char**     aChangeArgs   = theArgVec + anArgIter;
    Standard_Integer aNbChangeArgs = theArgsNb - anArgIter;
    TCollection_AsciiString aChangeArg (aChangeArgs[0]);
    aChangeArg.LowerCase();

    Standard_Boolean toEnable = Standard_True;
    if (Draw::ParseOnOff (aChangeArgs[0], toEnable))
    {
      aClipPlane->SetOn (toEnable);
    }
    else if (aChangeArg.StartsWith ("-equation")
          || aChangeArg.StartsWith ("equation"))
    {
      if (aNbChangeArgs < 5)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      Standard_Integer aSubIndex = 1;
      Standard_Integer aPrefixLen = 8 + (aChangeArg.Value (1) == '-' ? 1 : 0);
      if (aPrefixLen < aChangeArg.Length())
      {
        TCollection_AsciiString aSubStr = aChangeArg.SubString (aPrefixLen + 1, aChangeArg.Length());
        if (!aSubStr.IsIntegerValue()
          || aSubStr.IntegerValue() <= 0)
        {
          Message::SendFail() << "Syntax error: unknown argument '" << aChangeArg << "'";
          return 1;
        }
        aSubIndex = aSubStr.IntegerValue();
      }

      Standard_Real aCoeffA = Draw::Atof (aChangeArgs[1]);
      Standard_Real aCoeffB = Draw::Atof (aChangeArgs[2]);
      Standard_Real aCoeffC = Draw::Atof (aChangeArgs[3]);
      Standard_Real aCoeffD = Draw::Atof (aChangeArgs[4]);
      Handle(Graphic3d_ClipPlane) aSubPln = aClipPlane;
      for (Standard_Integer aSubPlaneIter = 1; aSubPlaneIter < aSubIndex; ++aSubPlaneIter)
      {
        if (aSubPln->ChainNextPlane().IsNull())
        {
          aSubPln->SetChainNextPlane (new Graphic3d_ClipPlane (*aSubPln));
        }
        aSubPln = aSubPln->ChainNextPlane();
      }
      aSubPln->SetChainNextPlane (Handle(Graphic3d_ClipPlane)());
      aSubPln->SetEquation (gp_Pln (aCoeffA, aCoeffB, aCoeffC, aCoeffD));
      anArgIter += 4;
    }
    else if ((aChangeArg == "-boxinterior"
           || aChangeArg == "-boxint"
           || aChangeArg == "-box")
            && aNbChangeArgs >= 7)
    {
      Graphic3d_BndBox3d aBndBox;
      aBndBox.Add (Graphic3d_Vec3d (Draw::Atof (aChangeArgs[1]), Draw::Atof (aChangeArgs[2]), Draw::Atof (aChangeArgs[3])));
      aBndBox.Add (Graphic3d_Vec3d (Draw::Atof (aChangeArgs[4]), Draw::Atof (aChangeArgs[5]), Draw::Atof (aChangeArgs[6])));
      anArgIter += 6;

      Standard_Integer aNbSubPlanes = 6;
      const Graphic3d_Vec3d aDirArray[6] =
      {
        Graphic3d_Vec3d (-1, 0, 0),
        Graphic3d_Vec3d ( 1, 0, 0),
        Graphic3d_Vec3d ( 0,-1, 0),
        Graphic3d_Vec3d ( 0, 1, 0),
        Graphic3d_Vec3d ( 0, 0,-1),
        Graphic3d_Vec3d ( 0, 0, 1),
      };
      Handle(Graphic3d_ClipPlane) aSubPln = aClipPlane;
      for (Standard_Integer aSubPlaneIter = 0; aSubPlaneIter < aNbSubPlanes; ++aSubPlaneIter)
      {
        const Graphic3d_Vec3d& aDir = aDirArray[aSubPlaneIter];
        const Standard_Real aW = -aDir.Dot ((aSubPlaneIter % 2 == 1) ? aBndBox.CornerMax() : aBndBox.CornerMin());
        aSubPln->SetEquation (gp_Pln (aDir.x(), aDir.y(), aDir.z(), aW));
        if (aSubPlaneIter + 1 == aNbSubPlanes)
        {
          aSubPln->SetChainNextPlane (Handle(Graphic3d_ClipPlane)());
        }
        else
        {
          aSubPln->SetChainNextPlane (new Graphic3d_ClipPlane (*aSubPln));
        }
        aSubPln = aSubPln->ChainNextPlane();
      }
    }
    else if (aChangeArg == "-capping"
          || aChangeArg == "capping")
    {
      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      if (Draw::ParseOnOff (aChangeArgs[1], toEnable))
      {
        aClipPlane->SetCapping (toEnable);
        anArgIter += 1;
      }
      else
      {
        // just skip otherwise (old syntax)
      }
    }
    else if (aChangeArg == "-useobjectmaterial"
          || aChangeArg == "-useobjectmat"
          || aChangeArg == "-useobjmat"
          || aChangeArg == "-useobjmaterial")
    {
      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      if (Draw::ParseOnOff (aChangeArgs[1], toEnable))
      {
        aClipPlane->SetUseObjectMaterial (toEnable == Standard_True);
        anArgIter += 1;
      }
    }
    else if (aChangeArg == "-useobjecttexture"
          || aChangeArg == "-useobjecttex"
          || aChangeArg == "-useobjtexture"
          || aChangeArg == "-useobjtex")
    {
      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      if (Draw::ParseOnOff (aChangeArgs[1], toEnable))
      {
        aClipPlane->SetUseObjectTexture (toEnable == Standard_True);
        anArgIter += 1;
      }
    }
    else if (aChangeArg == "-useobjectshader"
          || aChangeArg == "-useobjshader")
    {
      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      if (Draw::ParseOnOff (aChangeArgs[1], toEnable))
      {
        aClipPlane->SetUseObjectShader (toEnable == Standard_True);
        anArgIter += 1;
      }
    }
    else if (aChangeArg == "-color"
          || aChangeArg == "color")
    {
      Quantity_Color aColor;
      Standard_Integer aNbParsed = Draw::ParseColor (aNbChangeArgs - 1,
                                                     aChangeArgs + 1,
                                                     aColor);
      if (aNbParsed == 0)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }
      aClipPlane->SetCappingColor (aColor);
      anArgIter += aNbParsed;
    }
    else if (aNbChangeArgs >= 1
          && (aChangeArg == "-material"
           || aChangeArg == "material"))
    {
      ++anArgIter;
      Graphic3d_NameOfMaterial aMatName;
      if (!Graphic3d_MaterialAspect::MaterialFromName (aChangeArgs[1], aMatName))
      {
        Message::SendFail() << "Syntax error: unknown material '" << aChangeArgs[1] << "'";
        return 1;
      }
      aClipPlane->SetCappingMaterial (aMatName);
    }
    else if ((aChangeArg == "-transparency"
           || aChangeArg == "-transp")
          && aNbChangeArgs >= 2)
    {
      TCollection_AsciiString aValStr (aChangeArgs[1]);
      Handle(Graphic3d_AspectFillArea3d) anAspect = aClipPlane->CappingAspect();
      if (aValStr.IsRealValue (Standard_True))
      {
        Graphic3d_MaterialAspect aMat = aClipPlane->CappingMaterial();
        aMat.SetTransparency ((float )aValStr.RealValue());
        anAspect->SetAlphaMode (Graphic3d_AlphaMode_BlendAuto);
        aClipPlane->SetCappingMaterial (aMat);
      }
      else
      {
        aValStr.LowerCase();
        Graphic3d_AlphaMode aMode = Graphic3d_AlphaMode_BlendAuto;
        if (aValStr == "opaque")
        {
          aMode = Graphic3d_AlphaMode_Opaque;
        }
        else if (aValStr == "mask")
        {
          aMode = Graphic3d_AlphaMode_Mask;
        }
        else if (aValStr == "blend")
        {
          aMode = Graphic3d_AlphaMode_Blend;
        }
        else if (aValStr == "maskblend"
              || aValStr == "blendmask")
        {
          aMode = Graphic3d_AlphaMode_MaskBlend;
        }
        else if (aValStr == "blendauto")
        {
          aMode = Graphic3d_AlphaMode_BlendAuto;
        }
        else
        {
          Message::SendFail() << "Syntax error at '" << aValStr << "'";
          return 1;
        }
        anAspect->SetAlphaMode (aMode);
        aClipPlane->SetCappingAspect (anAspect);
      }
      anArgIter += 1;
    }
    else if (aChangeArg == "-texname"
          || aChangeArg == "texname")
    {
      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      TCollection_AsciiString aTextureName (aChangeArgs[1]);
      Handle(Graphic3d_Texture2Dmanual) aTexture = new Graphic3d_Texture2Dmanual(aTextureName);
      if (!aTexture->IsDone())
      {
        aClipPlane->SetCappingTexture (NULL);
      }
      else
      {
        aTexture->EnableModulate();
        aTexture->EnableRepeat();
        aClipPlane->SetCappingTexture (aTexture);
      }
      anArgIter += 1;
    }
    else if (aChangeArg == "-texscale"
          || aChangeArg == "texscale")
    {
      if (aClipPlane->CappingTexture().IsNull())
      {
        Message::SendFail ("Error: no texture is set");
        return 1;
      }

      if (aNbChangeArgs < 3)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      Standard_ShortReal aSx = (Standard_ShortReal)Draw::Atof (aChangeArgs[1]);
      Standard_ShortReal aSy = (Standard_ShortReal)Draw::Atof (aChangeArgs[2]);
      aClipPlane->CappingTexture()->GetParams()->SetScale (Graphic3d_Vec2 (aSx, aSy));
      anArgIter += 2;
    }
    else if (aChangeArg == "-texorigin"
          || aChangeArg == "texorigin") // texture origin
    {
      if (aClipPlane->CappingTexture().IsNull())
      {
        Message::SendFail ("Error: no texture is set");
        return 1;
      }

      if (aNbChangeArgs < 3)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      Standard_ShortReal aTx = (Standard_ShortReal)Draw::Atof (aChangeArgs[1]);
      Standard_ShortReal aTy = (Standard_ShortReal)Draw::Atof (aChangeArgs[2]);

      aClipPlane->CappingTexture()->GetParams()->SetTranslation (Graphic3d_Vec2 (aTx, aTy));
      anArgIter += 2;
    }
    else if (aChangeArg == "-texrotate"
          || aChangeArg == "texrotate") // texture rotation
    {
      if (aClipPlane->CappingTexture().IsNull())
      {
        Message::SendFail ("Error: no texture is set");
        return 1;
      }

      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      Standard_ShortReal aRot = (Standard_ShortReal)Draw::Atof (aChangeArgs[1]);
      aClipPlane->CappingTexture()->GetParams()->SetRotation (aRot);
      anArgIter += 1;
    }
    else if (aChangeArg == "-hatch"
          || aChangeArg == "hatch")
    {
      if (aNbChangeArgs < 2)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }

      TCollection_AsciiString aHatchStr (aChangeArgs[1]);
      aHatchStr.LowerCase();
      if (aHatchStr == "on")
      {
        aClipPlane->SetCappingHatchOn();
      }
      else if (aHatchStr == "off")
      {
        aClipPlane->SetCappingHatchOff();
      }
      else
      {
        aClipPlane->SetCappingHatch ((Aspect_HatchStyle)Draw::Atoi (aChangeArgs[1]));
      }
      anArgIter += 1;
    }
    else if (aChangeArg == "-delete"
          || aChangeArg == "delete")
    {
      removePlane (aRegPlanes, aPlaneName);
      return 0;
    }
    else if (aChangeArg == "-set"
          || aChangeArg == "-unset"
          || aChangeArg == "-setoverrideglobal")
    {
      // set / unset plane command
      const Standard_Boolean toSet            = aChangeArg.StartsWith ("-set");
      const Standard_Boolean toOverrideGlobal = aChangeArg == "-setoverrideglobal";
      Standard_Integer anIt = 1;
      for (; anIt < aNbChangeArgs; ++anIt)
      {
        TCollection_AsciiString anEntityName (aChangeArgs[anIt]);
        if (anEntityName.IsEmpty()
         || anEntityName.Value (1) == '-')
        {
          break;
        }
        else if (!toOverrideGlobal
               && ViewerTest_myViews.IsBound1 (anEntityName))
        {
          Handle(V3d_View) aView = ViewerTest_myViews.Find1 (anEntityName);
          if (toSet)
          {
            aView->AddClipPlane (aClipPlane);
          }
          else
          {
            aView->RemoveClipPlane (aClipPlane);
          }
          continue;
        }
        else if (GetMapOfAIS().IsBound2 (anEntityName))
        {
          Handle(AIS_InteractiveObject) aIObj = GetMapOfAIS().Find2 (anEntityName);
          if (toSet)
          {
            aIObj->AddClipPlane (aClipPlane);
          }
          else
          {
            aIObj->RemoveClipPlane (aClipPlane);
          }
          if (!aIObj->ClipPlanes().IsNull())
          {
            aIObj->ClipPlanes()->SetOverrideGlobal (toOverrideGlobal);
          }
        }
        else
        {
          Message::SendFail() << "Error: object/view '" << anEntityName << "' is not found";
          return 1;
        }
      }

      if (anIt == 1)
      {
        // apply to active view
        if (toSet)
        {
          anActiveView->AddClipPlane (aClipPlane);
        }
        else
        {
          anActiveView->RemoveClipPlane (aClipPlane);
        }
      }
      else
      {
        anArgIter = anArgIter + anIt - 1;
      }
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument '" << aChangeArg << "'";
      return 1;
    }
  }

  ViewerTest::RedrawAllViews();
  return 0;
}

//===============================================================================================
//function : VZRange
//purpose  :
//===============================================================================================
static int VZRange (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  const Handle(V3d_View)& aCurrentView = ViewerTest::CurrentView();

  if (aCurrentView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Handle(Graphic3d_Camera) aCamera = aCurrentView->Camera();

  if (theArgsNb < 2)
  {
    theDi << "ZNear: " << aCamera->ZNear() << "\n";
    theDi << "ZFar: " << aCamera->ZFar() << "\n";
    return 0;
  }

  if (theArgsNb == 3)
  {
    Standard_Real aNewZNear = Draw::Atof (theArgVec[1]);
    Standard_Real aNewZFar  = Draw::Atof (theArgVec[2]);

    if (aNewZNear >= aNewZFar)
    {
      Message::SendFail ("Syntax error: invalid arguments: znear should be less than zfar");
      return 1;
    }

    if (!aCamera->IsOrthographic() && (aNewZNear <= 0.0 || aNewZFar <= 0.0))
    {
      Message::SendFail ("Syntax error: invalid arguments: znear, zfar should be positive for perspective camera");
      return 1;
    }

    aCamera->SetZRange (aNewZNear, aNewZFar);
  }
  else
  {
    Message::SendFail ("Syntax error: wrong command arguments");
    return 1;
  }

  aCurrentView->Redraw();

  return 0;
}

//===============================================================================================
//function : VAutoZFit
//purpose  :
//===============================================================================================
static int VAutoZFit (Draw_Interpretor& theDi, Standard_Integer theArgsNb, const char** theArgVec)
{
  const Handle(V3d_View)& aCurrentView = ViewerTest::CurrentView();

  if (aCurrentView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Real aScale = aCurrentView->AutoZFitScaleFactor();

  if (theArgsNb > 3)
  {
    Message::SendFail ("Syntax error: wrong command arguments");
    return 1;
  }

  if (theArgsNb < 2)
  {
    theDi << "Auto z-fit mode: \n"
          << "On: " << (aCurrentView->AutoZFitMode() ? "enabled" : "disabled") << "\n"
          << "Scale: " << aScale << "\n";
    return 0;
  }

  Standard_Boolean isOn = Draw::Atoi (theArgVec[1]) == 1;

  if (theArgsNb >= 3)
  {
    aScale = Draw::Atoi (theArgVec[2]);
  }

  aCurrentView->SetAutoZFitMode (isOn, aScale);
  aCurrentView->Redraw();
  return 0;
}

//! Auxiliary function to print projection type
inline const char* projTypeName (Graphic3d_Camera::Projection theProjType)
{
  switch (theProjType)
  {
    case Graphic3d_Camera::Projection_Orthographic: return "orthographic";
    case Graphic3d_Camera::Projection_Perspective:  return "perspective";
    case Graphic3d_Camera::Projection_Stereo:       return "stereoscopic";
    case Graphic3d_Camera::Projection_MonoLeftEye:  return "monoLeftEye";
    case Graphic3d_Camera::Projection_MonoRightEye: return "monoRightEye";
  }
  return "UNKNOWN";
}

//===============================================================================================
//function : VCamera
//purpose  :
//===============================================================================================
static int VCamera (Draw_Interpretor& theDI,
                    Standard_Integer  theArgsNb,
                    const char**      theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Handle(Graphic3d_Camera) aCamera = aView->Camera();
  if (theArgsNb < 2)
  {
    theDI << "ProjType:   " << projTypeName (aCamera->ProjectionType()) << "\n";
    theDI << "FOVy:       " << aCamera->FOVy() << "\n";
    theDI << "FOVx:       " << aCamera->FOVx() << "\n";
    theDI << "FOV2d:      " << aCamera->FOV2d() << "\n";
    theDI << "Distance:   " << aCamera->Distance() << "\n";
    theDI << "IOD:        " << aCamera->IOD() << "\n";
    theDI << "IODType:    " << (aCamera->GetIODType() == Graphic3d_Camera::IODType_Absolute   ? "absolute" : "relative") << "\n";
    theDI << "ZFocus:     " << aCamera->ZFocus() << "\n";
    theDI << "ZFocusType: " << (aCamera->ZFocusType() == Graphic3d_Camera::FocusType_Absolute ? "absolute" : "relative") << "\n";
    theDI << "ZNear:      " << aCamera->ZNear() << "\n";
    theDI << "ZFar:       " << aCamera->ZFar() << "\n";
    return 0;
  }

  TCollection_AsciiString aPrsName;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgsNb; ++anArgIter)
  {
    Standard_CString        anArg = theArgVec[anArgIter];
    TCollection_AsciiString anArgCase (anArg);
    anArgCase.LowerCase();
    if (anArgCase == "-proj"
     || anArgCase == "-projection"
     || anArgCase == "-projtype"
     || anArgCase == "-projectiontype")
    {
      theDI << projTypeName (aCamera->ProjectionType()) << " ";
    }
    else if (anArgCase == "-ortho"
          || anArgCase == "-orthographic")
    {
      aCamera->SetProjectionType (Graphic3d_Camera::Projection_Orthographic);
    }
    else if (anArgCase == "-persp"
          || anArgCase == "-perspective"
          || anArgCase == "-perspmono"
          || anArgCase == "-perspectivemono"
          || anArgCase == "-mono")
    {
      aCamera->SetProjectionType (Graphic3d_Camera::Projection_Perspective);
    }
    else if (anArgCase == "-stereo"
          || anArgCase == "-stereoscopic"
          || anArgCase == "-perspstereo"
          || anArgCase == "-perspectivestereo")
    {
      aCamera->SetProjectionType (Graphic3d_Camera::Projection_Stereo);
    }
    else if (anArgCase == "-left"
          || anArgCase == "-lefteye"
          || anArgCase == "-monoleft"
          || anArgCase == "-monolefteye"
          || anArgCase == "-perpsleft"
          || anArgCase == "-perpslefteye")
    {
      aCamera->SetProjectionType (Graphic3d_Camera::Projection_MonoLeftEye);
    }
    else if (anArgCase == "-right"
          || anArgCase == "-righteye"
          || anArgCase == "-monoright"
          || anArgCase == "-monorighteye"
          || anArgCase == "-perpsright")
    {
      aCamera->SetProjectionType (Graphic3d_Camera::Projection_MonoRightEye);
    }
    else if (anArgCase == "-dist"
          || anArgCase == "-distance")
    {
      Standard_CString anArgValue = (anArgIter + 1 < theArgsNb) ? theArgVec[anArgIter + 1] : NULL;
      if (anArgValue != NULL
      && *anArgValue != '-')
      {
        ++anArgIter;
        aCamera->SetDistance (Draw::Atof (anArgValue));
        continue;
      }
      theDI << aCamera->Distance() << " ";
    }
    else if (anArgCase == "-iod")
    {
      Standard_CString anArgValue = (anArgIter + 1 < theArgsNb) ? theArgVec[anArgIter + 1] : NULL;
      if (anArgValue != NULL
      && *anArgValue != '-')
      {
        ++anArgIter;
        aCamera->SetIOD (aCamera->GetIODType(), Draw::Atof (anArgValue));
        continue;
      }
      theDI << aCamera->IOD() << " ";
    }
    else if (anArgCase == "-iodtype")
    {
      Standard_CString        anArgValue = (anArgIter + 1 < theArgsNb) ? theArgVec[anArgIter + 1] : "";
      TCollection_AsciiString anValueCase (anArgValue);
      anValueCase.LowerCase();
      if (anValueCase == "abs"
       || anValueCase == "absolute")
      {
        ++anArgIter;
        aCamera->SetIOD (Graphic3d_Camera::IODType_Absolute, aCamera->IOD());
        continue;
      }
      else if (anValueCase == "rel"
            || anValueCase == "relative")
      {
        ++anArgIter;
        aCamera->SetIOD (Graphic3d_Camera::IODType_Relative, aCamera->IOD());
        continue;
      }
      else if (*anArgValue != '-')
      {
        Message::SendFail() << "Error: unknown IOD type '" << anArgValue << "'";
        return 1;
      }
      switch (aCamera->GetIODType())
      {
        case Graphic3d_Camera::IODType_Absolute: theDI << "absolute "; break;
        case Graphic3d_Camera::IODType_Relative: theDI << "relative "; break;
      }
    }
    else if (anArgCase == "-zfocus")
    {
      Standard_CString anArgValue = (anArgIter + 1 < theArgsNb) ? theArgVec[anArgIter + 1] : NULL;
      if (anArgValue != NULL
      && *anArgValue != '-')
      {
        ++anArgIter;
        aCamera->SetZFocus (aCamera->ZFocusType(), Draw::Atof (anArgValue));
        continue;
      }
      theDI << aCamera->ZFocus() << " ";
    }
    else if (anArgCase == "-zfocustype")
    {
      Standard_CString        anArgValue = (anArgIter + 1 < theArgsNb) ? theArgVec[anArgIter + 1] : "";
      TCollection_AsciiString anValueCase (anArgValue);
      anValueCase.LowerCase();
      if (anValueCase == "abs"
       || anValueCase == "absolute")
      {
        ++anArgIter;
        aCamera->SetZFocus (Graphic3d_Camera::FocusType_Absolute, aCamera->ZFocus());
        continue;
      }
      else if (anValueCase == "rel"
            || anValueCase == "relative")
      {
        ++anArgIter;
        aCamera->SetZFocus (Graphic3d_Camera::FocusType_Relative, aCamera->ZFocus());
        continue;
      }
      else if (*anArgValue != '-')
      {
        Message::SendFail() << "Error: unknown ZFocus type '" << anArgValue << "'";
        return 1;
      }
      switch (aCamera->ZFocusType())
      {
        case Graphic3d_Camera::FocusType_Absolute: theDI << "absolute "; break;
        case Graphic3d_Camera::FocusType_Relative: theDI << "relative "; break;
      }
    }
    else if (anArgCase == "-lockzup"
          || anArgCase == "-turntable")
    {
      bool toLockUp = true;
      if (++anArgIter < theArgsNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toLockUp))
      {
        --anArgIter;
      }
      ViewerTest::CurrentEventManager()->SetLockOrbitZUp (toLockUp);
    }
    else if (anArgCase == "-fov"
          || anArgCase == "-fovy"
          || anArgCase == "-fovx"
          || anArgCase == "-fov2d")
    {
      Standard_CString anArgValue = (anArgIter + 1 < theArgsNb) ? theArgVec[anArgIter + 1] : NULL;
      if (anArgValue != NULL
      && *anArgValue != '-')
      {
        ++anArgIter;
        if (anArgCase == "-fov2d")
        {
          aCamera->SetFOV2d (Draw::Atof (anArgValue));
        }
        else if (anArgCase == "-fovx")
        {
          aCamera->SetFOVy (Draw::Atof (anArgValue) / aCamera->Aspect());///
        }
        else
        {
          aCamera->SetFOVy (Draw::Atof (anArgValue));
        }
        continue;
      }
      if (anArgCase == "-fov2d")
      {
        theDI << aCamera->FOV2d() << " ";
      }
      else if (anArgCase == "-fovx")
      {
        theDI << aCamera->FOVx() << " ";
      }
      else
      {
        theDI << aCamera->FOVy() << " ";
      }
    }
    else if (anArgIter + 1 < theArgsNb
          && anArgCase == "-xrpose")
    {
      TCollection_AsciiString anXRArg (theArgVec[++anArgIter]);
      anXRArg.LowerCase();
      if (anXRArg == "base")
      {
        aCamera = aView->View()->BaseXRCamera();
      }
      else if (anXRArg == "head")
      {
        aCamera = aView->View()->PosedXRCamera();
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown XR pose '" << anXRArg << "'";
        return 1;
      }
      if (aCamera.IsNull())
      {
        Message::SendFail() << "Error: undefined XR pose";
        return 0;
      }
      if (aView->AutoZFitMode())
      {
        const Bnd_Box aMinMaxBox  = aView->View()->MinMaxValues (false);
        const Bnd_Box aGraphicBox = aView->View()->MinMaxValues (true);
        aCamera->ZFitAll (aView->AutoZFitScaleFactor(), aMinMaxBox, aGraphicBox);
      }
    }
    else if (aPrsName.IsEmpty()
         && !anArgCase.StartsWith ("-"))
    {
      aPrsName = anArg;
    }
    else
    {
      Message::SendFail() << "Error: unknown argument '" << anArg << "'";
      return 1;
    }
  }

  if (aPrsName.IsEmpty()
   || theArgsNb > 2)
  {
    aView->Redraw();
  }

  if (!aPrsName.IsEmpty())
  {
    Handle(AIS_CameraFrustum) aCameraFrustum;
    if (GetMapOfAIS().IsBound2 (aPrsName))
    {
      // find existing object
      aCameraFrustum = Handle(AIS_CameraFrustum)::DownCast (GetMapOfAIS().Find2 (theArgVec[1]));
      if (aCameraFrustum.IsNull())
      {
        Message::SendFail() << "Error: object '" << aPrsName << "'is already defined and is not a camera frustum";
        return 1;
      }
    }

    if (aCameraFrustum.IsNull())
    {
      aCameraFrustum = new AIS_CameraFrustum();
    }
    else
    {
      // not include displayed object of old camera frustum in the new one.
      ViewerTest::GetAISContext()->Erase (aCameraFrustum, false);
      aView->ZFitAll();
    }
    aCameraFrustum->SetCameraFrustum (aCamera);

    ViewerTest::Display (aPrsName, aCameraFrustum);
  }

  return 0;
}

//! Parse stereo output mode
inline Standard_Boolean parseStereoMode (Standard_CString      theArg,
                                         Graphic3d_StereoMode& theMode)
{
  TCollection_AsciiString aFlag (theArg);
  aFlag.LowerCase();
  if (aFlag == "quadbuffer")
  {
    theMode = Graphic3d_StereoMode_QuadBuffer;
  }
  else if (aFlag == "anaglyph")
  {
    theMode = Graphic3d_StereoMode_Anaglyph;
  }
  else if (aFlag == "row"
        || aFlag == "rowinterlaced")
  {
    theMode = Graphic3d_StereoMode_RowInterlaced;
  }
  else if (aFlag == "col"
        || aFlag == "colinterlaced"
        || aFlag == "columninterlaced")
  {
    theMode = Graphic3d_StereoMode_ColumnInterlaced;
  }
  else if (aFlag == "chess"
        || aFlag == "chessboard")
  {
    theMode = Graphic3d_StereoMode_ChessBoard;
  }
  else if (aFlag == "sbs"
        || aFlag == "sidebyside")
  {
    theMode = Graphic3d_StereoMode_SideBySide;
  }
  else if (aFlag == "ou"
        || aFlag == "overunder")
  {
    theMode = Graphic3d_StereoMode_OverUnder;
  }
  else if (aFlag == "pageflip"
        || aFlag == "softpageflip")
  {
    theMode = Graphic3d_StereoMode_SoftPageFlip;
  }
  else if (aFlag == "openvr"
        || aFlag == "vr")
  {
    theMode = Graphic3d_StereoMode_OpenVR;
  }
  else
  {
    return Standard_False;
  }
  return Standard_True;
}

//! Parse anaglyph filter
inline Standard_Boolean parseAnaglyphFilter (Standard_CString                     theArg,
                                             Graphic3d_RenderingParams::Anaglyph& theFilter)
{
  TCollection_AsciiString aFlag (theArg);
  aFlag.LowerCase();
  if (aFlag == "redcyansimple")
  {
    theFilter = Graphic3d_RenderingParams::Anaglyph_RedCyan_Simple;
  }
  else if (aFlag == "redcyan"
        || aFlag == "redcyanoptimized")
  {
    theFilter = Graphic3d_RenderingParams::Anaglyph_RedCyan_Optimized;
  }
  else if (aFlag == "yellowbluesimple")
  {
    theFilter = Graphic3d_RenderingParams::Anaglyph_YellowBlue_Simple;
  }
  else if (aFlag == "yellowblue"
        || aFlag == "yellowblueoptimized")
  {
    theFilter = Graphic3d_RenderingParams::Anaglyph_YellowBlue_Optimized;
  }
  else if (aFlag == "greenmagenta"
        || aFlag == "greenmagentasimple")
  {
    theFilter = Graphic3d_RenderingParams::Anaglyph_GreenMagenta_Simple;
  }
  else
  {
    return Standard_False;
  }
  return Standard_True;
}

//==============================================================================
//function : VStereo
//purpose  :
//==============================================================================

static int VStereo (Draw_Interpretor& theDI,
                    Standard_Integer  theArgNb,
                    const char**      theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 0;
  }

  Handle(Graphic3d_Camera) aCamera = aView->Camera();
  Graphic3d_RenderingParams* aParams = &aView->ChangeRenderingParams();
  if (theArgNb < 2)
  {
    Standard_Boolean isActive = aCamera->ProjectionType() == Graphic3d_Camera::Projection_Stereo;
    theDI << "Stereo " << (isActive ? "ON" : "OFF") << "\n";
    if (isActive)
    {
      TCollection_AsciiString aMode;
      switch (aView->RenderingParams().StereoMode)
      {
        case Graphic3d_StereoMode_QuadBuffer       : aMode = "quadBuffer";       break;
        case Graphic3d_StereoMode_RowInterlaced    : aMode = "rowInterlaced";    break;
        case Graphic3d_StereoMode_ColumnInterlaced : aMode = "columnInterlaced"; break;
        case Graphic3d_StereoMode_ChessBoard       : aMode = "chessBoard";       break;
        case Graphic3d_StereoMode_SideBySide       : aMode = "sideBySide";       break;
        case Graphic3d_StereoMode_OverUnder        : aMode = "overUnder";        break;
        case Graphic3d_StereoMode_SoftPageFlip     : aMode = "softpageflip";     break;
        case Graphic3d_StereoMode_OpenVR           : aMode = "openVR";           break;
        case Graphic3d_StereoMode_Anaglyph  :
          aMode = "anaglyph";
          switch (aView->RenderingParams().AnaglyphFilter)
          {
            case Graphic3d_RenderingParams::Anaglyph_RedCyan_Simple      : aMode.AssignCat (" (redCyanSimple)");      break;
            case Graphic3d_RenderingParams::Anaglyph_RedCyan_Optimized   : aMode.AssignCat (" (redCyan)");            break;
            case Graphic3d_RenderingParams::Anaglyph_YellowBlue_Simple   : aMode.AssignCat (" (yellowBlueSimple)");   break;
            case Graphic3d_RenderingParams::Anaglyph_YellowBlue_Optimized: aMode.AssignCat (" (yellowBlue)");         break;
            case Graphic3d_RenderingParams::Anaglyph_GreenMagenta_Simple : aMode.AssignCat (" (greenMagentaSimple)"); break;
            default: break;
          }
        default: break;
      }
      theDI << "Mode " << aMode << "\n";
    }
    return 0;
  }

  Graphic3d_StereoMode aMode = aParams->StereoMode;
  ViewerTest_AutoUpdater anUpdateTool (ViewerTest::GetAISContext(), aView);
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    Standard_CString        anArg = theArgVec[anArgIter];
    TCollection_AsciiString aFlag (anArg);
    aFlag.LowerCase();
    if (anUpdateTool.parseRedrawMode (aFlag))
    {
      continue;
    }
    else if (aFlag == "0"
          || aFlag == "off")
    {
      if (++anArgIter < theArgNb)
      {
        Message::SendFail ("Error: wrong number of arguments");
        return 1;
      }

      if (aCamera->ProjectionType() == Graphic3d_Camera::Projection_Stereo)
      {
        aCamera->SetProjectionType (Graphic3d_Camera::Projection_Perspective);
      }
      return 0;
    }
    else if (aFlag == "1"
          || aFlag == "on")
    {
      if (++anArgIter < theArgNb)
      {
        Message::SendFail ("Error: wrong number of arguments");
        return 1;
      }

      aCamera->SetProjectionType (Graphic3d_Camera::Projection_Stereo);
      if (aParams->StereoMode != Graphic3d_StereoMode_OpenVR)
      {
        return 0;
      }
    }
    else if (aFlag == "-reverse"
          || aFlag == "-reversed"
          || aFlag == "-swap")
    {
      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams->ToReverseStereo = toEnable;
    }
    else if (aFlag == "-noreverse"
          || aFlag == "-noswap")
    {
      Standard_Boolean toDisable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toDisable))
      {
        --anArgIter;
      }
      aParams->ToReverseStereo = !toDisable;
    }
    else if (aFlag == "-mode"
          || aFlag == "-stereomode")
    {
      if (++anArgIter >= theArgNb
      || !parseStereoMode (theArgVec[anArgIter], aMode))
      {
        Message::SendFail() << "Syntax error at '" << anArg << "'";
        return 1;
      }

      if (aMode == Graphic3d_StereoMode_QuadBuffer)
      {
        Message::SendInfo() << "Warning: make sure to call 'vcaps -stereo 1' before creating a view";
      }
    }
    else if (aFlag == "-anaglyph"
          || aFlag == "-anaglyphfilter")
    {
      Graphic3d_RenderingParams::Anaglyph aFilter = Graphic3d_RenderingParams::Anaglyph_RedCyan_Simple;
      if (++anArgIter >= theArgNb
      || !parseAnaglyphFilter (theArgVec[anArgIter], aFilter))
      {
        Message::SendFail() << "Syntax error at '" << anArg << "'";
        return 1;
      }

      aMode = Graphic3d_StereoMode_Anaglyph;
      aParams->AnaglyphFilter = aFilter;
    }
    else if (parseStereoMode (anArg, aMode)) // short syntax
    {
      if (aMode == Graphic3d_StereoMode_QuadBuffer)
      {
        Message::SendInfo() << "Warning: make sure to call 'vcaps -stereo 1' before creating a view";
      }
    }
    else if (anArgIter + 1 < theArgNb
          && aFlag == "-hmdfov2d")
    {
      aParams->HmdFov2d = (float )Draw::Atof (theArgVec[++anArgIter]);
      if (aParams->HmdFov2d < 10.0f
       || aParams->HmdFov2d > 180.0f)
      {
        Message::SendFail() << "Error: FOV is out of range";
        return 1;
      }
    }
    else if (aFlag == "-mirror"
          || aFlag == "-mirrorcomposer")
    {
      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams->ToMirrorComposer = toEnable;
    }
    else if (anArgIter + 1 < theArgNb
          && (aFlag == "-unitfactor"
           || aFlag == "-unitscale"))
    {
      aView->View()->SetUnitFactor (Draw::Atof (theArgVec[++anArgIter]));
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << anArg << "'";
      return 1;
    }
  }

  aParams->StereoMode = aMode;
  aCamera->SetProjectionType (Graphic3d_Camera::Projection_Stereo);
  if (aParams->StereoMode == Graphic3d_StereoMode_OpenVR)
  {
    // initiate implicit continuous rendering
    ViewerTest::CurrentEventManager()->FlushViewEvents (ViewerTest::GetAISContext(), aView, true);
  }
  return 0;
}

//===============================================================================================
//function : VDefaults
//purpose  :
//===============================================================================================
static int VDefaults (Draw_Interpretor& theDi,
                      Standard_Integer  theArgsNb,
                      const char**      theArgVec)
{
  const Handle(AIS_InteractiveContext)& aCtx = ViewerTest::GetAISContext();
  if (aCtx.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Handle(Prs3d_Drawer) aDefParams = aCtx->DefaultDrawer();
  if (theArgsNb < 2)
  {
    if (aDefParams->TypeOfDeflection() == Aspect_TOD_RELATIVE)
    {
      theDi << "DeflType:           relative\n"
            << "DeviationCoeff:     " << aDefParams->DeviationCoefficient() << "\n";
    }
    else
    {
      theDi << "DeflType:           absolute\n"
            << "AbsoluteDeflection: " << aDefParams->MaximalChordialDeviation() << "\n";
    }
    theDi << "AngularDeflection:  " << (180.0 * aDefParams->DeviationAngle() / M_PI) << "\n";
    theDi << "AutoTriangulation:  " << (aDefParams->IsAutoTriangulation() ? "on" : "off") << "\n";
    return 0;
  }

  for (Standard_Integer anArgIter = 1; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.UpperCase();
    if (anArg == "-ABSDEFL"
     || anArg == "-ABSOLUTEDEFLECTION"
     || anArg == "-DEFL"
     || anArg == "-DEFLECTION")
    {
      if (++anArgIter >= theArgsNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      aDefParams->SetTypeOfDeflection         (Aspect_TOD_ABSOLUTE);
      aDefParams->SetMaximalChordialDeviation (Draw::Atof (theArgVec[anArgIter]));
    }
    else if (anArg == "-RELDEFL"
          || anArg == "-RELATIVEDEFLECTION"
          || anArg == "-DEVCOEFF"
          || anArg == "-DEVIATIONCOEFF"
          || anArg == "-DEVIATIONCOEFFICIENT")
    {
      if (++anArgIter >= theArgsNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      aDefParams->SetTypeOfDeflection     (Aspect_TOD_RELATIVE);
      aDefParams->SetDeviationCoefficient (Draw::Atof (theArgVec[anArgIter]));
    }
    else if (anArg == "-ANGDEFL"
          || anArg == "-ANGULARDEFL"
          || anArg == "-ANGULARDEFLECTION")
    {
      if (++anArgIter >= theArgsNb)
      {
        Message::SendFail() << "Syntax error at " << anArg;
        return 1;
      }
      aDefParams->SetDeviationAngle (M_PI * Draw::Atof (theArgVec[anArgIter]) / 180.0);
    }
    else if (anArg == "-AUTOTR"
          || anArg == "-AUTOTRIANG"
          || anArg == "-AUTOTRIANGULATION")
    {
      ++anArgIter;
      bool toTurnOn = true;
      if (anArgIter >= theArgsNb
      || !Draw::ParseOnOff (theArgVec[anArgIter], toTurnOn))
      {
        Message::SendFail() << "Syntax error at '" << anArg << "'";
        return 1;
      }
      aDefParams->SetAutoTriangulation (toTurnOn);
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument '" << anArg << "'";
      return 1;
    }
  }

  return 0;
}

//! Parse light source type from string.
static bool parseLightSourceType (const TCollection_AsciiString& theTypeName,
                                  Graphic3d_TypeOfLightSource& theType)
{
  TCollection_AsciiString aType (theTypeName);
  aType.LowerCase();
  if (aType == "amb"
   || aType == "ambient"
   || aType == "amblight")
  {
    theType = Graphic3d_TypeOfLightSource_Ambient;
  }
  else if (aType == "directional"
        || aType == "dirlight")
  {
    theType = Graphic3d_TypeOfLightSource_Directional;
  }
  else if (aType == "spot"
        || aType == "spotlight")
  {
    theType = Graphic3d_TypeOfLightSource_Spot;
  }
  else if (aType == "poslight"
        || aType == "positional"
        || aType == "point"
        || aType == "pnt")
  {
    theType = Graphic3d_TypeOfLightSource_Positional;
  }
  else
  {
    return false;
  }
  return true;
}

//! Find existing light by name or index.
static Handle(V3d_Light) findLightSource (const TCollection_AsciiString& theName)
{
  Handle(V3d_Light) aLight;
  Standard_Integer aLightIndex = -1;
  Draw::ParseInteger (theName.ToCString(), aLightIndex);
  Standard_Integer aLightIt = 0;
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  for (V3d_ListOfLightIterator aLightIter (aView->ActiveLightIterator()); aLightIter.More(); aLightIter.Next(), ++aLightIt)
  {
    if (aLightIndex != -1)
    {
      if (aLightIt == aLightIndex)
      {
        return aLightIter.Value();
      }
    }
    else if (aLightIter.Value()->GetId() == theName
          || aLightIter.Value()->Name()  == theName)
    {
      if (!aLight.IsNull())
      {
        Message::SendWarning() << "Warning: ambiguous light name '" << theName << "'";
        break;
      }
      aLight = aLightIter.Value();
    }
  }
  return aLight;
}

//===============================================================================================
//function : VLight
//purpose  :
//===============================================================================================
static int VLight (Draw_Interpretor& theDi,
                   Standard_Integer  theArgsNb,
                   const char**      theArgVec)
{
  Handle(V3d_View)   aView   = ViewerTest::CurrentView();
  Handle(V3d_Viewer) aViewer = ViewerTest::GetViewerFromContext();
  const Handle(AIS_InteractiveContext)& aCtx = ViewerTest::GetAISContext();
  if (aView.IsNull()
   || aViewer.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  if (theArgsNb < 2)
  {
    // print lights info
    Standard_Integer aLightId = 0;
    for (V3d_ListOfLightIterator aLightIter (aView->ActiveLightIterator()); aLightIter.More(); aLightIter.Next(), ++aLightId)
    {
      Handle(V3d_Light) aLight = aLightIter.Value();
      const Quantity_Color aColor = aLight->Color();
      theDi << "Light #" << aLightId
            << (!aLight->Name().IsEmpty() ? (TCollection_AsciiString(" ") + aLight->Name()) : "")
            << " [" << aLight->GetId() << "] "
            << (aLight->IsEnabled() ? "ON" : "OFF") << "\n";
      switch (aLight->Type())
      {
        case V3d_AMBIENT:
        {
          theDi << "  Type:       Ambient\n"
                << "  Intensity:  " << aLight->Intensity() << "\n";
          break;
        }
        case V3d_DIRECTIONAL:
        {
          theDi << "  Type:       Directional\n"
                << "  Intensity:  " << aLight->Intensity() << "\n"
                << "  Headlight:  " << (aLight->Headlight() ? "TRUE" : "FALSE") << "\n"
                << "  CastShadows:" << (aLight->ToCastShadows() ? "TRUE" : "FALSE") << "\n"
                << "  Smoothness: " << aLight->Smoothness() << "\n"
                << "  Direction:  " << aLight->PackedDirection().x() << " " << aLight->PackedDirection().y() << " " << aLight->PackedDirection().z() << "\n";
          break;
        }
        case V3d_POSITIONAL:
        {
          theDi << "  Type:       Positional\n"
                << "  Intensity:  " << aLight->Intensity() << "\n"
                << "  Headlight:  " << (aLight->Headlight() ? "TRUE" : "FALSE") << "\n"
                << "  CastShadows:" << (aLight->ToCastShadows() ? "TRUE" : "FALSE") << "\n"
                << "  Smoothness: " << aLight->Smoothness() << "\n"
                << "  Position:   " << aLight->Position().X() << " " << aLight->Position().Y() << " " << aLight->Position().Z() << "\n"
                << "  Atten.:     " << aLight->ConstAttenuation() << " " << aLight->LinearAttenuation() << "\n"
                << "  Range:      " << aLight->Range() << "\n";
          break;
        }
        case V3d_SPOT:
        {
          theDi << "  Type:       Spot\n"
                << "  Intensity:  " << aLight->Intensity() << "\n"
                << "  Headlight:  " << (aLight->Headlight() ? "TRUE" : "FALSE") << "\n"
                << "  CastShadows:" << (aLight->ToCastShadows() ? "TRUE" : "FALSE") << "\n"
                << "  Position:   " << aLight->Position().X() << " " << aLight->Position().Y() << " " << aLight->Position().Z() << "\n"
                << "  Direction:  " << aLight->PackedDirection().x() << " " << aLight->PackedDirection().y() << " " << aLight->PackedDirection().z() << "\n"
                << "  Atten.:     " << aLight->ConstAttenuation() << " " << aLight->LinearAttenuation() << "\n"
                << "  Angle:      " << (aLight->Angle() * 180.0 / M_PI) << "\n"
                << "  Exponent:   " << aLight->Concentration() << "\n"
                << "  Range:      " << aLight->Range() << "\n";
          break;
        }
        default:
        {
          theDi << "  Type:       UNKNOWN\n";
          break;
        }
      }
      theDi << "  Color:      " << aColor.Red() << " " << aColor.Green() << " " << aColor.Blue() << " [" << Quantity_Color::StringName (aColor.Name()) << "]\n";
    }
  }

  Handle(V3d_Light) aLightOld, aLightNew;
  Graphic3d_ZLayerId aLayer = Graphic3d_ZLayerId_UNKNOWN;
  bool isGlobal = true;
  ViewerTest_AutoUpdater anUpdateTool (aCtx, aView);
  Handle(AIS_LightSource) aLightPrs;
  for (Standard_Integer anArgIt = 1; anArgIt < theArgsNb; ++anArgIt)
  {
    const TCollection_AsciiString anArg (theArgVec[anArgIt]);
    TCollection_AsciiString anArgCase (anArg);
    anArgCase.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      continue;
    }
    else if (anArgCase == "-new"
          || anArgCase == "-add"
          || anArgCase == "-create"
          || anArgCase == "-type"
          || (anArgCase == "-reset"
          && !aLightNew.IsNull())
          || (anArgCase == "-defaults"
          && !aLightNew.IsNull())
          || anArgCase == "add"
          || anArgCase == "new"
          || anArgCase == "create")
    {
      Graphic3d_TypeOfLightSource aType = Graphic3d_TypeOfLightSource_Ambient;
      if (anArgCase == "-reset")
      {
        aType = aLightNew->Type();
      }
      else if (anArgIt + 1 >= theArgsNb
           || !parseLightSourceType (theArgVec[++anArgIt], aType))
      {
        theDi << "Syntax error at '" << theArgVec[anArgIt] << "'\n";
        return 1;
      }

      TCollection_AsciiString aName;
      if (!aLightNew.IsNull())
      {
        aName = aLightNew->Name();
      }
      switch (aType)
      {
        case Graphic3d_TypeOfLightSource_Ambient:
        {
          aLightNew = new V3d_AmbientLight();
          break;
        }
        case Graphic3d_TypeOfLightSource_Directional:
        {
          aLightNew = new V3d_DirectionalLight();
          break;
        }
        case Graphic3d_TypeOfLightSource_Spot:
        {
          aLightNew = new V3d_SpotLight (gp_Pnt (0.0, 0.0, 0.0));
          break;
        }
        case Graphic3d_TypeOfLightSource_Positional:
        {
          aLightNew = new V3d_PositionalLight (gp_Pnt (0.0, 0.0, 0.0));
          break;
        }
      }

      if (anArgCase == "-type"
      && !aLightOld.IsNull())
      {
        aLightNew->CopyFrom (aLightOld);
      }
      aLightNew->SetName (aName);
    }
    else if ((anArgCase == "-layer"
           || anArgCase == "-zlayer")
          && anArgIt + 1 < theArgsNb)
    {
      if (!ViewerTest::ParseZLayer (theArgVec[++anArgIt], aLayer)
      ||  aLayer == Graphic3d_ZLayerId_UNKNOWN)
      {
        Message::SendFail() << "Error: wrong syntax at '" << theArgVec[anArgIt] << "'";
        return 1;
      }
    }
    else if (anArgCase == "-glob"
          || anArgCase == "-global"
          || anArgCase == "-loc"
          || anArgCase == "-local")
    {
      isGlobal = anArgCase.StartsWith ("-glob");
    }
    else if (anArgCase == "-def"
          || anArgCase == "-defaults"
          || anArgCase == "-reset")
    {
      aViewer->SetDefaultLights();
      aLightOld.Nullify();
      aLightNew.Nullify();
      aLightPrs.Nullify();
    }
    else if (anArgCase == "-clr"
          || anArgCase == "-clear"
          || anArgCase == "clear")
    {
      TColStd_SequenceOfInteger aLayers;
      aViewer->GetAllZLayers (aLayers);
      for (TColStd_SequenceOfInteger::Iterator aLayeriter (aLayers); aLayeriter.More(); aLayeriter.Next())
      {
        if (aLayeriter.Value() == aLayer
         || aLayer == Graphic3d_ZLayerId_UNKNOWN)
        {
          Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayeriter.Value());
          aSettings.SetLights (Handle(Graphic3d_LightSet)());
          aViewer->SetZLayerSettings (aLayeriter.Value(), aSettings);
          if (aLayer != Graphic3d_ZLayerId_UNKNOWN)
          {
            break;
          }
        }
      }

      if (aLayer == Graphic3d_ZLayerId_UNKNOWN)
      {
        ViewerTest_DoubleMapOfInteractiveAndName& aMap = GetMapOfAIS();
        for (V3d_ListOfLightIterator aLightIter (aView->ActiveLightIterator()); aLightIter.More();)
        {
          Handle(V3d_Light) aLight = aLightIter.Value();
          Handle(AIS_InteractiveObject) aPrsObject;
          GetMapOfAIS().Find2 (aLight->Name(), aPrsObject);
          if (Handle(AIS_LightSource) aLightSourceDel = Handle(AIS_LightSource)::DownCast (aPrsObject))
          {
            aCtx->Remove (aLightSourceDel, false);
            aMap.UnBind1 (aLightSourceDel);
          }
          aViewer->DelLight (aLight);
          aLightIter = aView->ActiveLightIterator();
        }
      }

      aLightOld.Nullify();
      aLightNew.Nullify();
      aLightPrs.Nullify();
    }
    else if (!aLightNew.IsNull()
          && (anArgCase == "-display"
           || anArgCase == "-disp"
           || anArgCase == "-presentation"
           || anArgCase == "-prs"))
    {
      TCollection_AsciiString aLightName = aLightNew->Name();
      if (anArgIt + 1 < theArgsNb
       && theArgVec[anArgIt + 1][0] != '-')
      {
        // old syntax
        aLightName = theArgVec[++anArgIt];
        if (aLightNew->Name() != aLightName)
        {
          if (Handle(V3d_Light) anOtherLight = findLightSource (aLightName))
          {
            theDi << "Syntax error: light with name '" << aLightName << "' is already defined";
            return 1;
          }
          aLightNew->SetName (aLightName);
        }
      }
      if (aLightName.IsEmpty())
      {
        Message::SendFail() << "Error: nameless light source cannot be displayed";
        return 1;
      }
      if (aLightPrs.IsNull())
      {
        aLightPrs = new AIS_LightSource (aLightNew);
      }
      theDi << aLightName << " ";
    }
    else if (!aLightNew.IsNull()
          && (anArgCase == "-disable"
           || anArgCase == "-disabled"
           || anArgCase == "-enable"
           || anArgCase == "-enabled"))
    {
      bool toEnable = Draw::ParseOnOffIterator (theArgsNb, theArgVec, anArgIt);
      if (anArgCase == "-disable"
       || anArgCase == "-disabled")
      {
        toEnable = !toEnable;
      }
      aLightNew->SetEnabled (toEnable);
    }
    else if (!aLightNew.IsNull()
          && (anArgCase == "-color"
           || anArgCase == "-colour"
           || anArgCase == "color"))
    {
      Quantity_Color aColor;
      Standard_Integer aNbParsed = Draw::ParseColor (theArgsNb - anArgIt - 1,
                                                     theArgVec + anArgIt + 1,
                                                     aColor);
      anArgIt += aNbParsed;
      if (aNbParsed == 0)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      aLightNew->SetColor (aColor);
    }
    else if (!aLightNew.IsNull()
          && (anArgCase == "-pos"
           || anArgCase == "-position"
           || anArgCase == "-prsposition"
           || anArgCase == "-prspos"
           || anArgCase == "pos"
           || anArgCase == "position")
          && (anArgIt + 3) < theArgsNb)
    {
      gp_XYZ aPosXYZ;
      if (!parseXYZ (theArgVec + anArgIt + 1, aPosXYZ))
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      anArgIt += 3;
      if (anArgCase == "-prsposition"
       || anArgCase == "-prspos")
      {
        aLightNew->SetDisplayPosition (aPosXYZ);
      }
      else
      {
        if (aLightNew->Type() != Graphic3d_TypeOfLightSource_Positional
         && aLightNew->Type() != Graphic3d_TypeOfLightSource_Spot)
        {
          Message::SendFail() << "Syntax error at argument '" << anArg << "'";
          return 1;
        }

        aLightNew->SetPosition (aPosXYZ);
      }
    }
    else if (!aLightNew.IsNull()
          && (aLightNew->Type() == Graphic3d_TypeOfLightSource_Directional
           || aLightNew->Type() == Graphic3d_TypeOfLightSource_Spot)
          && (anArgCase == "-dir"
           || anArgCase == "-direction")
          && (anArgIt + 3) < theArgsNb)
    {
      gp_XYZ aDirXYZ;
      if (!parseXYZ (theArgVec + anArgIt + 1, aDirXYZ))
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      anArgIt += 3;
      aLightNew->SetDirection (gp_Dir (aDirXYZ));
    }
    else if (!aLightNew.IsNull()
          && (anArgCase == "-smoothangle"
           || anArgCase == "-smoothradius"
           || anArgCase == "-sm"
           || anArgCase == "-smoothness")
          && anArgIt + 1 < theArgsNb)
    {
      Standard_ShortReal aSmoothness = (Standard_ShortReal )Atof (theArgVec[++anArgIt]);
      if (aLightNew->Type() == Graphic3d_TypeOfLightSource_Directional)
      {
        aSmoothness = Standard_ShortReal(aSmoothness * M_PI / 180.0);
      }
      if (Abs (aSmoothness) <= ShortRealEpsilon())
      {
        aLightNew->SetIntensity (1.f);
      }
      else if (Abs (aLightNew->Smoothness()) <= ShortRealEpsilon())
      {
        aLightNew->SetIntensity ((aSmoothness * aSmoothness) / 3.f);
      }
      else
      {
        Standard_ShortReal aSmoothnessRatio = static_cast<Standard_ShortReal> (aSmoothness / aLightNew->Smoothness());
        aLightNew->SetIntensity (aLightNew->Intensity() / (aSmoothnessRatio * aSmoothnessRatio));
      }

      if (aLightNew->Type() == Graphic3d_TypeOfLightSource_Positional)
      {
        aLightNew->SetSmoothRadius (aSmoothness);
      }
      else if (aLightNew->Type() == Graphic3d_TypeOfLightSource_Directional)
      {
        aLightNew->SetSmoothAngle (aSmoothness);
      }
    }
    else if (!aLightNew.IsNull()
          && (anArgCase == "-int"
           || anArgCase == "-intensity")
          && anArgIt + 1 < theArgsNb)
    {
      Standard_ShortReal aIntensity = (Standard_ShortReal )Atof (theArgVec[++anArgIt]);
      aLightNew->SetIntensity (aIntensity);
    }
    else if (!aLightNew.IsNull()
          &&  aLightNew->Type() == Graphic3d_TypeOfLightSource_Spot
          && (anArgCase == "-spotangle"
           || anArgCase == "-ang"
           || anArgCase == "-angle")
          && anArgIt + 1 < theArgsNb)
    {
      Standard_ShortReal anAngle = (Standard_ShortReal )Atof (theArgVec[++anArgIt]);
      anAngle = (Standard_ShortReal (anAngle / 180.0 * M_PI));
      aLightNew->SetAngle (anAngle);
    }
    else if (!aLightNew.IsNull()
          && (aLightNew->Type() == Graphic3d_TypeOfLightSource_Positional
           || aLightNew->Type() == Graphic3d_TypeOfLightSource_Spot)
          && (anArgCase == "-constatten"
           || anArgCase == "-constattenuation")
          && anArgIt + 1 < theArgsNb)
    {
      const Standard_ShortReal aConstAtten = (Standard_ShortReal )Atof (theArgVec[++anArgIt]);
      aLightNew->SetAttenuation (aConstAtten, aLightNew->LinearAttenuation());
    }
    else if (!aLightNew.IsNull()
          && (aLightNew->Type() == Graphic3d_TypeOfLightSource_Positional
           || aLightNew->Type() == Graphic3d_TypeOfLightSource_Spot)
          && (anArgCase == "-linatten"
           || anArgCase == "-linearatten"
           || anArgCase == "-linearattenuation")
          && anArgIt + 1 < theArgsNb)
    {
      const Standard_ShortReal aLinAtten = (Standard_ShortReal )Atof (theArgVec[++anArgIt]);
      aLightNew->SetAttenuation (aLightNew->ConstAttenuation(), aLinAtten);
    }
    else if (!aLightNew.IsNull()
          && aLightNew->Type() == Graphic3d_TypeOfLightSource_Spot
          && (anArgCase == "-spotexp"
           || anArgCase == "-spotexponent"
           || anArgCase == "-exp"
           || anArgCase == "-exponent")
          && anArgIt + 1 < theArgsNb)
    {
      aLightNew->SetConcentration ((Standard_ShortReal )Atof (theArgVec[++anArgIt]));
    }
    else if (!aLightNew.IsNull()
           && aLightNew->Type() != Graphic3d_TypeOfLightSource_Ambient
           && aLightNew->Type() != Graphic3d_TypeOfLightSource_Directional
           && anArgCase == "-range"
           && anArgIt + 1 < theArgsNb)
    {
      Standard_ShortReal aRange ((Standard_ShortReal)Atof (theArgVec[++anArgIt]));
      aLightNew->SetRange (aRange);
    }
    else if (!aLightNew.IsNull()
          && aLightNew->Type() != Graphic3d_TypeOfLightSource_Ambient
          && (anArgCase == "-head"
           || anArgCase == "-headlight"))
    {
      Standard_Boolean isHeadLight = Standard_True;
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], isHeadLight))
      {
        ++anArgIt;
      }
      aLightNew->SetHeadlight (isHeadLight);
    }
    else if (!aLightNew.IsNull()
           && anArgCase == "-name"
           && anArgIt + 1 < theArgsNb)
    {
      const TCollection_AsciiString aName = theArgVec[++anArgIt];
      if (aLightNew->Name() == aName)
      {
        continue;
      }

      if (Handle(V3d_Light) anOtherLight = findLightSource (aName))
      {
        theDi << "Syntax error: light with name '" << aName << "' is already defined";
        return 1;
      }
      aLightNew->SetName (aName);
    }
    else if (!aLightPrs.IsNull()
          && (anArgCase == "-showzoomable"
           || anArgCase == "-prszoomable"
           || anArgCase == "-zoomable"))
    {
      const bool isZoomable = Draw::ParseOnOffIterator (theArgsNb, theArgVec, anArgIt);
      aLightPrs->SetZoomable (isZoomable);
    }
    else if (!aLightPrs.IsNull()
          && (anArgCase == "-showname"
           || anArgCase == "-prsname"))
    {
      const bool toDisplay = Draw::ParseOnOffIterator (theArgsNb, theArgVec, anArgIt);
      aLightPrs->SetDisplayName (toDisplay);
    }
    else if (!aLightPrs.IsNull()
          && (aLightNew->Type() == Graphic3d_TypeOfLightSource_Spot
           || aLightNew->Type() == Graphic3d_TypeOfLightSource_Positional)
          && (anArgCase == "-showrange"
           || anArgCase == "-prsrange"))
    {
      const bool toDisplay = Draw::ParseOnOffIterator (theArgsNb, theArgVec, anArgIt);
      aLightPrs->SetDisplayRange (toDisplay);
    }
    else if (!aLightPrs.IsNull()
          && (anArgCase == "-showsize"
           || anArgCase == "-prssize")
          && anArgIt + 1 < theArgsNb)
    {
      Standard_Real aSize = 0.0;
      if (!Draw::ParseReal (theArgVec[++anArgIt], aSize)
       || aSize <= 0.0
       || aLightPrs.IsNull())
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      aLightPrs->SetSize (aSize);
    }
    else if (!aLightNew.IsNull()
          && aLightNew->Type() != Graphic3d_TypeOfLightSource_Ambient
          && (anArgCase == "-castshadow"
           || anArgCase == "-castshadows"
           || anArgCase == "-shadows"))
    {
      bool toCastShadows = true;
      if (anArgIt + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIt + 1], toCastShadows))
      {
        ++anArgIt;
      }
      aLightNew->SetCastShadows (toCastShadows);
    }
    else if (anArgCase == "-del"
          || anArgCase == "-delete"
          || anArgCase == "-remove"
          || anArgCase == "del"
          || anArgCase == "delete"
          || anArgCase == "remove")
    {
      if (aLightOld.IsNull())
      {
        if (!aLightNew.IsNull())
        {
          aLightNew.Nullify();
          continue;
        }

        if (++anArgIt >= theArgsNb)
        {
          Message::SendFail() << "Syntax error at argument '" << anArg << "'";
          return 1;
        }

        const TCollection_AsciiString anOldName (theArgVec[anArgIt]);
        aLightOld = findLightSource (anOldName);
        if (aLightOld.IsNull())
        {
          Message::SendWarning() << "Warning: light '" << anOldName << "' not found";
          continue;
        }
      }

      aLightNew.Nullify();
      aLightPrs.Nullify();
    }
    else if (anArgCase == "-change"
          || anArgCase == "change")
    {
      // just skip old syntax
    }
    else if (aLightNew.IsNull()
         && !anArgCase.StartsWith ("-"))
    {
      if (!aLightNew.IsNull())
      {
        continue;
      }

      const TCollection_AsciiString anOldName (theArgVec[anArgIt]);
      aLightOld = findLightSource (anOldName);
      if (!aLightOld.IsNull())
      {
        aLightNew = aLightOld;

        Handle(AIS_InteractiveObject) aPrsObject;
        GetMapOfAIS().Find2 (aLightOld->Name(), aPrsObject);
        aLightPrs = Handle(AIS_LightSource)::DownCast (aPrsObject);
      }
      else
      {
        Standard_Integer aLightIndex = -1;
        Draw::ParseInteger (anOldName.ToCString(), aLightIndex);
        if (aLightIndex != -1)
        {
          Message::SendFail() << "Syntax error: light source with index '" << aLightIndex << "' is not found";
          return 1;
        }

        aLightNew = new V3d_AmbientLight();
        aLightNew->SetName (anOldName);
      }
    }
    else
    {
      Message::SendFail() << "Warning: unknown argument '" << anArg << "'";
      return 1;
    }
  }

  // delete old light source
  if (!aLightOld.IsNull()
    && aLightOld != aLightNew)
  {
    TColStd_SequenceOfInteger aLayers;
    aViewer->GetAllZLayers (aLayers);
    for (TColStd_SequenceOfInteger::Iterator aLayerIter (aLayers); aLayerIter.More(); aLayerIter.Next())
    {
      if (aLayerIter.Value() == aLayer
       || aLayer == Graphic3d_ZLayerId_UNKNOWN)
      {
        Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayerIter.Value());
        if (!aSettings.Lights().IsNull())
        {
          aSettings.Lights()->Remove (aLightOld);
          if (aSettings.Lights()->IsEmpty())
          {
            aSettings.SetLights (Handle(Graphic3d_LightSet)());
          }
        }
        aViewer->SetZLayerSettings (aLayerIter.Value(), aSettings);
        if (aLayer != Graphic3d_ZLayerId_UNKNOWN)
        {
          break;
        }
      }
    }

    if (aLayer == Graphic3d_ZLayerId_UNKNOWN)
    {
      Handle(AIS_InteractiveObject) aPrsObject;
      GetMapOfAIS().Find2 (aLightOld->Name(), aPrsObject);
      if (Handle(AIS_LightSource) aLightSourceDel = Handle(AIS_LightSource)::DownCast (aPrsObject))
      {
        aCtx->Remove (aLightSourceDel, false);
        GetMapOfAIS().UnBind1 (aLightSourceDel);
      }
      aViewer->DelLight (aLightOld);
    }
    aLightOld.Nullify();
  }

  // add new light source
  if (!aLightNew.IsNull())
  {
    if (aLayer == Graphic3d_ZLayerId_UNKNOWN)
    {
      aViewer->AddLight (aLightNew);
      if (isGlobal)
      {
        aViewer->SetLightOn (aLightNew);
      }
      else
      {
        aView->SetLightOn (aLightNew);
      }
    }
    else
    {
      Graphic3d_ZLayerSettings aSettings = aViewer->ZLayerSettings (aLayer);
      if (aSettings.Lights().IsNull())
      {
        aSettings.SetLights (new Graphic3d_LightSet());
      }
      aSettings.Lights()->Add (aLightNew);
      aViewer->SetZLayerSettings (aLayer, aSettings);
    }

    if (!aLightPrs.IsNull())
    {
      aLightPrs->SetLight (aLightNew);
      ViewerTest::Display (aLightNew->Name(), aLightPrs, false);
    }
  }

  // manage presentations
  struct LightPrsSort
  {
    bool operator() (const Handle(AIS_LightSource)& theLeft,
                     const Handle(AIS_LightSource)& theRight)
    {
      return theLeft->Light()->GetId() < theRight->Light()->GetId();
    }
  };

  AIS_ListOfInteractive aPrsList;
  aCtx->DisplayedObjects (AIS_KindOfInteractive_LightSource, -1, aPrsList);
  if (!aPrsList.IsEmpty())
  {
    // update light source presentations
    std::vector<Handle(AIS_LightSource)> aLightPrsVec;
    for (AIS_ListOfInteractive::Iterator aPrsIter (aPrsList); aPrsIter.More(); aPrsIter.Next())
    {
      if (Handle(AIS_LightSource) aLightPrs2 = Handle(AIS_LightSource)::DownCast (aPrsIter.Value()))
      {
        aLightPrsVec.push_back (aLightPrs2);
      }
    }

    // sort objects by id as AIS_InteractiveContext stores them in unordered map
    std::sort (aLightPrsVec.begin(), aLightPrsVec.end(), LightPrsSort());

    Standard_Integer aTopStack = 0;
    for (std::vector<Handle(AIS_LightSource)>::iterator aPrsIter = aLightPrsVec.begin(); aPrsIter != aLightPrsVec.end(); ++aPrsIter)
    {
      Handle(AIS_LightSource) aLightPrs2 = *aPrsIter;
      if (!aLightPrs2->TransformPersistence().IsNull()
        && aLightPrs2->TransformPersistence()->IsTrihedronOr2d())
      {
        const Standard_Integer aPrsSize = (Standard_Integer )aLightPrs2->Size();
        aLightPrs2->TransformPersistence()->SetOffset2d (Graphic3d_Vec2i (aTopStack + aPrsSize, aPrsSize));
        aTopStack += aPrsSize + aPrsSize / 2;
      }
      aCtx->Redisplay (aLightPrs2, false);
      aCtx->SetTransformPersistence (aLightPrs2, aLightPrs2->TransformPersistence());
    }
  }
  return 0;
}

//===============================================================================================
//function : VPBREnvironment
//purpose  :
//===============================================================================================
static int VPBREnvironment (Draw_Interpretor&,
                            Standard_Integer theArgsNb,
                            const char**     theArgVec)
{
  if (theArgsNb > 2)
  {
    Message::SendFail ("Syntax error: 'vpbrenv' command has only one argument");
    return 1;
  }

  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  TCollection_AsciiString anArg = TCollection_AsciiString (theArgVec[1]);
  anArg.LowerCase();

  if (anArg == "-generate"
   || anArg == "-gen")
  {
    aView->GeneratePBREnvironment (Standard_True);
  }
  else if (anArg == "-clear")
  {
    aView->ClearPBREnvironment (Standard_True);
  }
  else
  {
    Message::SendFail() << "Syntax error: unknown argument [" << theArgVec[1] << "] for 'vpbrenv' command";
    return 1;
  }

  return 0;
}

//! Read Graphic3d_RenderingParams::PerfCounters flag.
static Standard_Boolean parsePerfStatsFlag (const TCollection_AsciiString& theValue,
                                            Standard_Boolean& theToReset,
                                            Graphic3d_RenderingParams::PerfCounters& theFlagsRem,
                                            Graphic3d_RenderingParams::PerfCounters& theFlagsAdd)
{
  Graphic3d_RenderingParams::PerfCounters aFlag = Graphic3d_RenderingParams::PerfCounters_NONE;
  TCollection_AsciiString aVal = theValue;
  Standard_Boolean toReverse = Standard_False;
  if (aVal == "none")
  {
    theToReset = Standard_True;
    return Standard_True;
  }
  else if (aVal.StartsWith ("-"))
  {
    toReverse = Standard_True;
    aVal = aVal.SubString (2, aVal.Length());
  }
  else if (aVal.StartsWith ("no"))
  {
    toReverse = Standard_True;
    aVal = aVal.SubString (3, aVal.Length());
  }
  else if (aVal.StartsWith ("+"))
  {
    aVal = aVal.SubString (2, aVal.Length());
  }
  else
  {
    theToReset = Standard_True;
  }

  if (     aVal == "fps"
        || aVal == "framerate")  aFlag = Graphic3d_RenderingParams::PerfCounters_FrameRate;
  else if (aVal == "cpu")        aFlag = Graphic3d_RenderingParams::PerfCounters_CPU;
  else if (aVal == "layers")     aFlag = Graphic3d_RenderingParams::PerfCounters_Layers;
  else if (aVal == "structs"
        || aVal == "structures"
        || aVal == "objects")    aFlag = Graphic3d_RenderingParams::PerfCounters_Structures;
  else if (aVal == "groups")     aFlag = Graphic3d_RenderingParams::PerfCounters_Groups;
  else if (aVal == "arrays")     aFlag = Graphic3d_RenderingParams::PerfCounters_GroupArrays;
  else if (aVal == "tris"
        || aVal == "triangles")  aFlag = Graphic3d_RenderingParams::PerfCounters_Triangles;
  else if (aVal == "pnts"
        || aVal == "points")     aFlag = Graphic3d_RenderingParams::PerfCounters_Points;
  else if (aVal == "lines")      aFlag = Graphic3d_RenderingParams::PerfCounters_Lines;
  else if (aVal == "mem"
        || aVal == "gpumem"
        || aVal == "estimmem")   aFlag = Graphic3d_RenderingParams::PerfCounters_EstimMem;
  else if (aVal == "skipimmediate"
        || aVal == "noimmediate") aFlag = Graphic3d_RenderingParams::PerfCounters_SkipImmediate;
  else if (aVal == "frametime"
        || aVal == "frametimers"
        || aVal == "time")       aFlag = Graphic3d_RenderingParams::PerfCounters_FrameTime;
  else if (aVal == "basic")      aFlag = Graphic3d_RenderingParams::PerfCounters_Basic;
  else if (aVal == "extended"
        || aVal == "verbose"
        || aVal == "extra")      aFlag = Graphic3d_RenderingParams::PerfCounters_Extended;
  else if (aVal == "full"
        || aVal == "all")        aFlag = Graphic3d_RenderingParams::PerfCounters_All;
  else
  {
    return Standard_False;
  }

  if (toReverse)
  {
    theFlagsRem = Graphic3d_RenderingParams::PerfCounters(theFlagsRem | aFlag);
  }
  else
  {
    theFlagsAdd = Graphic3d_RenderingParams::PerfCounters(theFlagsAdd | aFlag);
  }
  return Standard_True;
}

//! Read Graphic3d_RenderingParams::PerfCounters flags.
static Standard_Boolean convertToPerfStatsFlags (const TCollection_AsciiString& theValue,
                                                 Graphic3d_RenderingParams::PerfCounters& theFlags)
{
  TCollection_AsciiString aValue = theValue;
  Graphic3d_RenderingParams::PerfCounters aFlagsRem = Graphic3d_RenderingParams::PerfCounters_NONE;
  Graphic3d_RenderingParams::PerfCounters aFlagsAdd = Graphic3d_RenderingParams::PerfCounters_NONE;
  Standard_Boolean toReset = Standard_False;
  for (;;)
  {
    Standard_Integer aSplitPos = aValue.Search ("|");
    if (aSplitPos <= 0)
    {
      if (!parsePerfStatsFlag (aValue, toReset, aFlagsRem, aFlagsAdd))
      {
        return Standard_False;
      }
      if (toReset)
      {
        theFlags = Graphic3d_RenderingParams::PerfCounters_NONE;
      }
      theFlags = Graphic3d_RenderingParams::PerfCounters(theFlags |  aFlagsAdd);
      theFlags = Graphic3d_RenderingParams::PerfCounters(theFlags & ~aFlagsRem);
      return Standard_True;
    }

    if (aSplitPos > 1)
    {
      TCollection_AsciiString aSubValue = aValue.SubString (1, aSplitPos - 1);
      if (!parsePerfStatsFlag (aSubValue, toReset, aFlagsRem, aFlagsAdd))
      {
        return Standard_False;
      }
    }
    aValue = aValue.SubString (aSplitPos + 1, aValue.Length());
  }
}

//=======================================================================
//function : VRenderParams
//purpose  : Enables/disables rendering features
//=======================================================================

static Standard_Integer VRenderParams (Draw_Interpretor& theDI,
                                       Standard_Integer  theArgNb,
                                       const char**      theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Graphic3d_RenderingParams& aParams = aView->ChangeRenderingParams();
  TCollection_AsciiString aCmdName (theArgVec[0]);
  aCmdName.LowerCase();
  if (aCmdName == "vraytrace")
  {
    if (theArgNb == 1)
    {
      theDI << (aParams.Method == Graphic3d_RM_RAYTRACING ? "on" : "off") << " ";
      return 0;
    }
    else if (theArgNb == 2)
    {
      TCollection_AsciiString aValue (theArgVec[1]);
      aValue.LowerCase();
      if (aValue == "on"
       || aValue == "1")
      {
        aParams.Method = Graphic3d_RM_RAYTRACING;
        aView->Redraw();
        return 0;
      }
      else if (aValue == "off"
            || aValue == "0")
      {
        aParams.Method = Graphic3d_RM_RASTERIZATION;
        aView->Redraw();
        return 0;
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown argument '" << theArgVec[1] << "'";
        return 1;
      }
    }
    else
    {
      Message::SendFail ("Syntax error: wrong number of arguments");
      return 1;
    }
  }

  if (theArgNb < 2)
  {
    theDI << "renderMode:  ";
    switch (aParams.Method)
    {
      case Graphic3d_RM_RASTERIZATION: theDI << "rasterization "; break;
      case Graphic3d_RM_RAYTRACING:    theDI << "raytrace ";      break;
    }
    theDI << "\n";
    theDI << "transparency:  ";
    switch (aParams.TransparencyMethod)
    {
      case Graphic3d_RTM_BLEND_UNORDERED: theDI << "Basic blended transparency with non-commuting operator "; break;
      case Graphic3d_RTM_BLEND_OIT:       theDI << "Weighted Blended Order-Independent Transparency, depth weight factor: "
                                                << TCollection_AsciiString (aParams.OitDepthFactor); break;
      case Graphic3d_RTM_DEPTH_PEELING_OIT: theDI << "Depth Peeling Order-Independent Transparency, Nb.Layers: "
                                                << TCollection_AsciiString (aParams.NbOitDepthPeelingLayers); break;
    }
    theDI << "\n";
    theDI << "msaa:           " <<  aParams.NbMsaaSamples                               << "\n";
    theDI << "rendScale:      " <<  aParams.RenderResolutionScale                       << "\n";
    theDI << "rayDepth:       " <<  aParams.RaytracingDepth                             << "\n";
    theDI << "fsaa:           " << (aParams.IsAntialiasingEnabled       ? "on" : "off") << "\n";
    theDI << "shadows:        " << (aParams.IsShadowEnabled             ? "on" : "off") << "\n";
    theDI << "shadowMapRes:   " <<  aParams.ShadowMapResolution                         << "\n";
    theDI << "shadowMapBias:  " <<  aParams.ShadowMapBias                               << "\n";
    theDI << "reflections:    " << (aParams.IsReflectionEnabled         ? "on" : "off") << "\n";
    theDI << "gleam:          " << (aParams.IsTransparentShadowEnabled  ? "on" : "off") << "\n";
    theDI << "GI:             " << (aParams.IsGlobalIlluminationEnabled ? "on" : "off") << "\n";
    theDI << "blocked RNG:    " << (aParams.CoherentPathTracingMode     ? "on" : "off") << "\n";
    theDI << "iss:            " << (aParams.AdaptiveScreenSampling      ? "on" : "off") << "\n";
    theDI << "iss debug:      " << (aParams.ShowSamplingTiles           ? "on" : "off") << "\n";
    theDI << "two-sided BSDF: " << (aParams.TwoSidedBsdfModels          ? "on" : "off") << "\n";
    theDI << "max radiance:   " <<  aParams.RadianceClampingValue                       << "\n";
    theDI << "nb tiles (iss): " <<  aParams.NbRayTracingTiles                           << "\n";
    theDI << "tile size (iss):" <<  aParams.RayTracingTileSize << "x" << aParams.RayTracingTileSize << "\n";
    theDI << "shadingModel: ";
    switch (aView->ShadingModel())
    {
      case Graphic3d_TOSM_DEFAULT:   theDI << "default";   break;
      case Graphic3d_TOSM_UNLIT:     theDI << "unlit";     break;
      case Graphic3d_TOSM_FACET:     theDI << "flat";      break;
      case Graphic3d_TOSM_VERTEX:    theDI << "gouraud";   break;
      case Graphic3d_TOSM_FRAGMENT:  theDI << "phong";     break;
      case Graphic3d_TOSM_PBR:       theDI << "pbr";       break;
      case Graphic3d_TOSM_PBR_FACET: theDI << "pbr_facet"; break;
    }
    theDI << "\n";
    {
      theDI << "perfCounters:";
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_FrameRate) != 0)
      {
        theDI << " fps";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_CPU) != 0)
      {
        theDI << " cpu";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_Structures) != 0)
      {
        theDI << " structs";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_Groups) != 0)
      {
        theDI << " groups";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_GroupArrays) != 0)
      {
        theDI << " arrays";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_Triangles) != 0)
      {
        theDI << " tris";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_Lines) != 0)
      {
        theDI << " lines";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_Points) != 0)
      {
        theDI << " pnts";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_EstimMem) != 0)
      {
        theDI << " gpumem";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_FrameTime) != 0)
      {
        theDI << " frameTime";
      }
      if ((aParams.CollectedStats & Graphic3d_RenderingParams::PerfCounters_SkipImmediate) != 0)
      {
        theDI << " skipimmediate";
      }
      if (aParams.CollectedStats == Graphic3d_RenderingParams::PerfCounters_NONE)
      {
        theDI << " none";
      }
      theDI << "\n";
    }
    theDI << "depth pre-pass: " << (aParams.ToEnableDepthPrepass        ? "on" : "off") << "\n";
    theDI << "alpha to coverage: " << (aParams.ToEnableAlphaToCoverage  ? "on" : "off") << "\n";
    theDI << "frustum culling: " << (aParams.FrustumCullingState == Graphic3d_RenderingParams::FrustumCulling_On  ? "on" :
                                     aParams.FrustumCullingState == Graphic3d_RenderingParams::FrustumCulling_Off ? "off" :
                                                                                                                    "noUpdate") << "\n";
    theDI << "\n";
    return 0;
  }

  bool toPrint = false, toSyncDefaults = false, toSyncAllViews = false;
  ViewerTest_AutoUpdater anUpdateTool (ViewerTest::GetAISContext(), aView);
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    Standard_CString        anArg (theArgVec[anArgIter]);
    TCollection_AsciiString aFlag (anArg);
    aFlag.LowerCase();
    if (anUpdateTool.parseRedrawMode (aFlag))
    {
      continue;
    }
    else if (aFlag == "-echo"
          || aFlag == "-print")
    {
      toPrint = Standard_True;
      anUpdateTool.Invalidate();
    }
    else if (aFlag == "-reset")
    {
      aParams = ViewerTest::GetViewerFromContext()->DefaultRenderingParams();
    }
    else if (aFlag == "-sync"
          && (anArgIter + 1 < theArgNb))
    {
      TCollection_AsciiString aSyncFlag (theArgVec[++anArgIter]);
      aSyncFlag.LowerCase();
      if (aSyncFlag == "default"
       || aSyncFlag == "defaults"
       || aSyncFlag == "viewer")
      {
        toSyncDefaults = true;
      }
      else if (aSyncFlag == "allviews"
            || aSyncFlag == "views")
      {
        toSyncAllViews = true;
      }
      else
      {
        Message::SendFail ("Syntax error: unknown parameter to -sync argument");
        return 1;
      }
    }
    else if (aFlag == "-mode"
          || aFlag == "-rendermode"
          || aFlag == "-render_mode")
    {
      if (toPrint)
      {
        switch (aParams.Method)
        {
          case Graphic3d_RM_RASTERIZATION: theDI << "rasterization "; break;
          case Graphic3d_RM_RAYTRACING:    theDI << "ray-tracing ";   break;
        }
        continue;
      }
      else
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-ray"
          || aFlag == "-raytrace")
    {
      if (toPrint)
      {
        theDI << (aParams.Method == Graphic3d_RM_RAYTRACING ? "true" : "false") << " ";
        continue;
      }

      bool isRayTrace = true;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], isRayTrace))
      {
        ++anArgIter;
      }
      aParams.Method = isRayTrace ? Graphic3d_RM_RAYTRACING : Graphic3d_RM_RASTERIZATION;
    }
    else if (aFlag == "-rast"
          || aFlag == "-raster"
          || aFlag == "-rasterization")
    {
      if (toPrint)
      {
        theDI << (aParams.Method == Graphic3d_RM_RASTERIZATION ? "true" : "false") << " ";
        continue;
      }

      bool isRaster = true;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], isRaster))
      {
        ++anArgIter;
      }
      aParams.Method = isRaster ? Graphic3d_RM_RASTERIZATION : Graphic3d_RM_RAYTRACING;
    }
    else if (aFlag == "-msaa")
    {
      if (toPrint)
      {
        theDI << aParams.NbMsaaSamples << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aNbSamples = Draw::Atoi (theArgVec[anArgIter]);
      if (aNbSamples < 0)
      {
        Message::SendFail() << "Syntax error: invalid number of MSAA samples " << aNbSamples << "";
        return 1;
      }
      else
      {
        aParams.NbMsaaSamples = aNbSamples;
      }
    }
    else if (aFlag == "-linefeather"
          || aFlag == "-edgefeather"
          || aFlag == "-feather")
    {
      if (toPrint)
      {
        theDI << " " << aParams.LineFeather << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aParam = theArgVec[anArgIter];
      const Standard_ShortReal aFeather = (Standard_ShortReal) Draw::Atof (theArgVec[anArgIter]);
      if (aFeather <= 0.0f)
      {
        Message::SendFail() << "Syntax error: invalid value of line width feather " << aFeather << ". Should be > 0";
        return 1;
      }
      aParams.LineFeather = aFeather;
    }
    else if (aFlag == "-oit")
    {
      if (toPrint)
      {
        if (aParams.TransparencyMethod == Graphic3d_RTM_BLEND_OIT)
        {
          theDI << "on, depth weight factor: " << TCollection_AsciiString (aParams.OitDepthFactor) << " ";
        }
        else if (aParams.TransparencyMethod == Graphic3d_RTM_DEPTH_PEELING_OIT)
        {
          theDI << "on, depth peeling layers: " << TCollection_AsciiString (aParams.NbOitDepthPeelingLayers) << " ";
        }
        else
        {
          theDI << "off" << " ";
        }
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aParam = theArgVec[anArgIter];
      aParam.LowerCase();
      if (aParam == "peeling"
       || aParam == "peel")
      {
        aParams.TransparencyMethod = Graphic3d_RTM_DEPTH_PEELING_OIT;
        if (anArgIter + 1 < theArgNb
         && TCollection_AsciiString (theArgVec[anArgIter + 1]).IsIntegerValue())
        {
          ++anArgIter;
          const Standard_Integer aNbLayers = TCollection_AsciiString (theArgVec[anArgIter]).IntegerValue();
          if (aNbLayers < 2)
          {
            Message::SendFail() << "Syntax error: invalid layers number specified for Depth Peeling OIT " << aNbLayers;
            return 1;
          }
          aParams.NbOitDepthPeelingLayers = TCollection_AsciiString (theArgVec[anArgIter]).IntegerValue();
        }
      }
      else if (aParam == "weighted"
            || aParam == "weight")
      {
        aParams.TransparencyMethod = Graphic3d_RTM_BLEND_OIT;
        if (anArgIter + 1 < theArgNb
         && TCollection_AsciiString (theArgVec[anArgIter + 1]).IsRealValue())
        {
          ++anArgIter;
          const Standard_ShortReal aWeight = (Standard_ShortReal)TCollection_AsciiString (theArgVec[anArgIter]).RealValue();
          if (aWeight < 0.f || aWeight > 1.f)
          {
            Message::SendFail() << "Syntax error: invalid value of Weighted Order-Independent Transparency depth weight factor " << aWeight << ". Should be within range [0.0; 1.0]";
            return 1;
          }
          aParams.OitDepthFactor = aWeight;
        }
      }
      else if (aParam.IsRealValue())
      {
        const Standard_ShortReal aWeight = (Standard_ShortReal) Draw::Atof (theArgVec[anArgIter]);
        if (aWeight < 0.f || aWeight > 1.f)
        {
          Message::SendFail() << "Syntax error: invalid value of Weighted Order-Independent Transparency depth weight factor " << aWeight << ". Should be within range [0.0; 1.0]";
          return 1;
        }

        aParams.TransparencyMethod = Graphic3d_RTM_BLEND_OIT;
        aParams.OitDepthFactor     = aWeight;
      }
      else if (aParam == "off")
      {
        aParams.TransparencyMethod = Graphic3d_RTM_BLEND_UNORDERED;
      }
      else
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-fonthinting"
          || aFlag == "-fonthint")
    {
      if (toPrint)
      {
        if ((aParams.FontHinting & Font_Hinting_Normal) != 0)
        {
          theDI << "normal" << " ";
        }
        else if ((aParams.FontHinting & Font_Hinting_Normal) != 0)
        {
          theDI << "light" << " ";
        }
        else
        {
          theDI << "off" << " ";
        }
        continue;
      }
      else if (anArgIter + 1 >= theArgNb)
      {
        theDI << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }

      TCollection_AsciiString aHintStyle (theArgVec[++anArgIter]);
      aHintStyle.LowerCase();
      if (aHintStyle == "normal"
       || aHintStyle == "on"
       || aHintStyle == "1")
      {
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_Light);
        aParams.FontHinting = Font_Hinting(aParams.FontHinting | Font_Hinting_Normal);
      }
      else if (aHintStyle == "light")
      {
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_Normal);
        aParams.FontHinting = Font_Hinting(aParams.FontHinting | Font_Hinting_Light);
      }
      else if (aHintStyle == "no"
            || aHintStyle == "off"
            || aHintStyle == "0")
      {
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_Normal);
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_Light);
      }
      else
      {
        theDI << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
    else if (aFlag == "-fontautohinting"
          || aFlag == "-fontautohint")
    {
      if (toPrint)
      {
        if ((aParams.FontHinting & Font_Hinting_ForceAutohint) != 0)
        {
          theDI << "force" << " ";
        }
        else if ((aParams.FontHinting & Font_Hinting_NoAutohint) != 0)
        {
          theDI << "disallow" << " ";
        }
        else
        {
          theDI << "auto" << " ";
        }
        continue;
      }
      else if (anArgIter + 1 >= theArgNb)
      {
        theDI << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }

      TCollection_AsciiString aHintStyle (theArgVec[++anArgIter]);
      aHintStyle.LowerCase();
      if (aHintStyle == "force")
      {
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_NoAutohint);
        aParams.FontHinting = Font_Hinting(aParams.FontHinting | Font_Hinting_ForceAutohint);
      }
      else if (aHintStyle == "disallow"
            || aHintStyle == "no")
      {
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_ForceAutohint);
        aParams.FontHinting = Font_Hinting(aParams.FontHinting | Font_Hinting_NoAutohint);
      }
      else if (aHintStyle == "auto")
      {
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_ForceAutohint);
        aParams.FontHinting = Font_Hinting(aParams.FontHinting & ~Font_Hinting_NoAutohint);
      }
      else
      {
        theDI << "Syntax error at '" << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
    else if (aFlag == "-depthprepass")
    {
      if (toPrint)
      {
        theDI << (aParams.ToEnableDepthPrepass ? "on " : "off ");
        continue;
      }
      aParams.ToEnableDepthPrepass = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], aParams.ToEnableDepthPrepass))
      {
        ++anArgIter;
      }
    }
    else if (aFlag == "-samplealphatocoverage"
          || aFlag == "-alphatocoverage")
    {
      if (toPrint)
      {
        theDI << (aParams.ToEnableAlphaToCoverage ? "on " : "off ");
        continue;
      }
      aParams.ToEnableAlphaToCoverage = Standard_True;
      if (anArgIter + 1 < theArgNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], aParams.ToEnableAlphaToCoverage))
      {
        ++anArgIter;
      }
    }
    else if (aFlag == "-rendscale"
          || aFlag == "-renderscale"
          || aFlag == "-renderresolutionscale")
    {
      if (toPrint)
      {
        theDI << aParams.RenderResolutionScale << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Real aScale = Draw::Atof (theArgVec[anArgIter]);
      if (aScale < 0.01)
      {
        Message::SendFail() << "Syntax error: invalid rendering resolution scale " << aScale << "";
        return 1;
      }
      else
      {
        aParams.RenderResolutionScale = Standard_ShortReal(aScale);
      }
    }
    else if (aFlag == "-raydepth"
          || aFlag == "-ray_depth")
    {
      if (toPrint)
      {
        theDI << aParams.RaytracingDepth << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aDepth = Draw::Atoi (theArgVec[anArgIter]);

      // We allow RaytracingDepth be more than 10 in case of GI enabled
      if (aDepth < 1 || (aDepth > 10 && !aParams.IsGlobalIlluminationEnabled))
      {
        Message::SendFail() << "Syntax error: invalid ray-tracing depth " << aDepth << ". Should be within range [1; 10]";
        return 1;
      }
      else
      {
        aParams.RaytracingDepth = aDepth;
      }
    }
    else if (aFlag == "-shad"
          || aFlag == "-shadows")
    {
      if (toPrint)
      {
        theDI << (aParams.IsShadowEnabled ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.IsShadowEnabled = toEnable;
    }
    else if (aFlag == "-shadowmapresolution"
          || aFlag == "-shadowmap")
    {
      if (toPrint)
      {
        theDI << aParams.ShadowMapResolution << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      aParams.ShadowMapResolution = Draw::Atoi (theArgVec[anArgIter]);
    }
    else if (aFlag == "-shadowmapbias")
    {
      if (toPrint)
      {
        theDI << aParams.ShadowMapBias << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      aParams.ShadowMapBias = (float )Draw::Atof (theArgVec[anArgIter]);
    }
    else if (aFlag == "-refl"
          || aFlag == "-reflections")
    {
      if (toPrint)
      {
        theDI << (aParams.IsReflectionEnabled ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.IsReflectionEnabled = toEnable;
    }
    else if (aFlag == "-fsaa")
    {
      if (toPrint)
      {
        theDI << (aParams.IsAntialiasingEnabled ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.IsAntialiasingEnabled = toEnable;
    }
    else if (aFlag == "-gleam")
    {
      if (toPrint)
      {
        theDI << (aParams.IsTransparentShadowEnabled ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.IsTransparentShadowEnabled = toEnable;
    }
    else if (aFlag == "-gi")
    {
      if (toPrint)
      {
        theDI << (aParams.IsGlobalIlluminationEnabled ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.IsGlobalIlluminationEnabled = toEnable;
      if (!toEnable)
      {
        aParams.RaytracingDepth = Min (aParams.RaytracingDepth, 10);
      }
    }
    else if (aFlag == "-blockedrng"
          || aFlag == "-brng")
    {
      if (toPrint)
      {
        theDI << (aParams.CoherentPathTracingMode ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
        && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.CoherentPathTracingMode = toEnable;
    }
    else if (aFlag == "-maxrad")
    {
      if (toPrint)
      {
        theDI << aParams.RadianceClampingValue << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const TCollection_AsciiString aMaxRadStr = theArgVec[anArgIter];
      if (!aMaxRadStr.IsRealValue (Standard_True))
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Real aMaxRadiance = aMaxRadStr.RealValue();
      if (aMaxRadiance <= 0.0)
      {
        Message::SendFail() << "Syntax error: invalid radiance clamping value " << aMaxRadiance;
        return 1;
      }
      else
      {
        aParams.RadianceClampingValue = static_cast<Standard_ShortReal> (aMaxRadiance);
      }
    }
    else if (aFlag == "-iss")
    {
      if (toPrint)
      {
        theDI << (aParams.AdaptiveScreenSampling ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
        && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.AdaptiveScreenSampling = toEnable;
    }
    else if (aFlag == "-issatomic")
    {
      if (toPrint)
      {
        theDI << (aParams.AdaptiveScreenSamplingAtomic ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
      && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.AdaptiveScreenSamplingAtomic = toEnable;
    }
    else if (aFlag == "-issd")
    {
      if (toPrint)
      {
        theDI << (aParams.ShowSamplingTiles ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
        && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.ShowSamplingTiles = toEnable;
    }
    else if (aFlag == "-tilesize")
    {
      if (toPrint)
      {
        theDI << aParams.RayTracingTileSize << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aTileSize = Draw::Atoi (theArgVec[anArgIter]);
      if (aTileSize < 1)
      {
        Message::SendFail() << "Syntax error: invalid size of ISS tile " << aTileSize;
        return 1;
      }
      aParams.RayTracingTileSize = aTileSize;
    }
    else if (aFlag == "-nbtiles")
    {
      if (toPrint)
      {
        theDI << aParams.NbRayTracingTiles << " ";
        continue;
      }
      else if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aNbTiles = Draw::Atoi (theArgVec[anArgIter]);
      if (aNbTiles < -1)
      {
        Message::SendFail() << "Syntax error: invalid number of ISS tiles " << aNbTiles;
        return 1;
      }
      else if (aNbTiles > 0
            && (aNbTiles < 64
             || aNbTiles > 1024))
      {
        Message::SendWarning() << "Warning: suboptimal number of ISS tiles " << aNbTiles << ". Recommended range: [64, 1024].";
      }
      aParams.NbRayTracingTiles = aNbTiles;
    }
    else if (aFlag == "-env")
    {
      if (toPrint)
      {
        theDI << (aParams.UseEnvironmentMapBackground ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
        && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.UseEnvironmentMapBackground = toEnable;
    }
    else if (aFlag == "-ignorenormalmap")
    {
      if (toPrint)
      {
        theDI << (aParams.ToIgnoreNormalMapInRayTracing ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
        && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.ToIgnoreNormalMapInRayTracing = toEnable;
    }
    else if (aFlag == "-twoside")
    {
      if (toPrint)
      {
        theDI << (aParams.TwoSidedBsdfModels ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
        && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.TwoSidedBsdfModels = toEnable;
    }
    else if (aFlag == "-shademodel"
          || aFlag == "-shadingmodel"
          || aFlag == "-shading")
    {
      if (toPrint)
      {
        switch (aView->ShadingModel())
        {
          case Graphic3d_TOSM_DEFAULT:   theDI << "default";   break;
          case Graphic3d_TOSM_UNLIT:     theDI << "unlit ";    break;
          case Graphic3d_TOSM_FACET:     theDI << "flat ";     break;
          case Graphic3d_TOSM_VERTEX:    theDI << "gouraud ";  break;
          case Graphic3d_TOSM_FRAGMENT:  theDI << "phong ";    break;
          case Graphic3d_TOSM_PBR:       theDI << "pbr";       break;
          case Graphic3d_TOSM_PBR_FACET: theDI << "pbr_facet"; break;
        }
        continue;
      }

      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
      }

      Graphic3d_TypeOfShadingModel aModel = Graphic3d_TOSM_DEFAULT;
      if (ViewerTest::ParseShadingModel (theArgVec[anArgIter], aModel)
       && aModel != Graphic3d_TOSM_DEFAULT)
      {
        aView->SetShadingModel (aModel);
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown shading model '" << theArgVec[anArgIter] << "'";
        return 1;
      }
    }
    else if (aFlag == "-pbrenvpow2size"
          || aFlag == "-pbrenvp2s"
          || aFlag == "-pep2s")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aPbrEnvPow2Size = Draw::Atoi (theArgVec[anArgIter]);
      if (aPbrEnvPow2Size < 1)
      {
        Message::SendFail ("Syntax error: 'Pow2Size' of PBR Environment has to be greater or equal 1");
        return 1;
      }
      aParams.PbrEnvPow2Size = aPbrEnvPow2Size;
    }
    else if (aFlag == "-pbrenvspecmaplevelsnumber"
          || aFlag == "-pbrenvspecmapnblevels"
          || aFlag == "-pbrenvspecmaplevels"
          || aFlag == "-pbrenvsmln"
          || aFlag == "-pesmln")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aPbrEnvSpecMapNbLevels = Draw::Atoi (theArgVec[anArgIter]);
      if (aPbrEnvSpecMapNbLevels < 2)
      {
        Message::SendFail ("Syntax error: 'SpecMapLevelsNumber' of PBR Environment has to be greater or equal 2");
        return 1;
      }
      aParams.PbrEnvSpecMapNbLevels = aPbrEnvSpecMapNbLevels;
    }
    else if (aFlag == "-pbrenvbakngdiffsamplesnumber"
          || aFlag == "-pbrenvbakingdiffsamples"
          || aFlag == "-pbrenvbdsn")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      const Standard_Integer aPbrEnvBakingDiffNbSamples = Draw::Atoi (theArgVec[anArgIter]);
      if (aPbrEnvBakingDiffNbSamples < 1)
      {
        Message::SendFail ("Syntax error: 'BakingDiffSamplesNumber' of PBR Environment has to be greater or equal 1");
        return 1;
      }
      aParams.PbrEnvBakingDiffNbSamples = aPbrEnvBakingDiffNbSamples;
    }
    else if (aFlag == "-pbrenvbakngspecsamplesnumber"
          || aFlag == "-pbrenvbakingspecsamples"
          || aFlag == "-pbrenvbssn")
    {
    if (++anArgIter >= theArgNb)
    {
      Message::SendFail() << "Syntax error at argument '" << anArg << "'";
      return 1;
    }

    const Standard_Integer aPbrEnvBakingSpecNbSamples = Draw::Atoi(theArgVec[anArgIter]);
    if (aPbrEnvBakingSpecNbSamples < 1)
    {
      Message::SendFail ("Syntax error: 'BakingSpecSamplesNumber' of PBR Environment has to be greater or equal 1");
      return 1;
    }
    aParams.PbrEnvBakingSpecNbSamples = aPbrEnvBakingSpecNbSamples;
    }
    else if (aFlag == "-pbrenvbakingprobability"
          || aFlag == "-pbrenvbp")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      const Standard_ShortReal aPbrEnvBakingProbability = static_cast<Standard_ShortReal>(Draw::Atof (theArgVec[anArgIter]));
      if (aPbrEnvBakingProbability < 0.f
       || aPbrEnvBakingProbability > 1.f)
      {
        Message::SendFail ("Syntax error: 'BakingProbability' of PBR Environment has to be in range of [0, 1]");
        return 1;
      }
      aParams.PbrEnvBakingProbability = aPbrEnvBakingProbability;
    }
    else if (aFlag == "-resolution")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aResolution (theArgVec[anArgIter]);
      if (aResolution.IsIntegerValue())
      {
        aView->ChangeRenderingParams().Resolution = static_cast<unsigned int> (Draw::Atoi (aResolution.ToCString()));
      }
      else
      {
        Message::SendFail() << "Syntax error: wrong syntax at argument'" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-rebuildglsl"
          || aFlag == "-rebuild")
    {
      if (toPrint)
      {
        theDI << (aParams.RebuildRayTracingShaders ? "on" : "off") << " ";
        continue;
      }

      Standard_Boolean toEnable = Standard_True;
      if (++anArgIter < theArgNb
          && !Draw::ParseOnOff (theArgVec[anArgIter], toEnable))
      {
        --anArgIter;
      }
      aParams.RebuildRayTracingShaders = toEnable;
    }
    else if (aFlag == "-focal")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aParam (theArgVec[anArgIter]);
      if (aParam.IsRealValue (Standard_True))
      {
        float aFocalDist = static_cast<float> (aParam.RealValue());
        if (aFocalDist < 0)
        {
          Message::SendFail() << "Error: parameter can't be negative at argument '" << anArg << "'";
          return 1;
        }
        aView->ChangeRenderingParams().CameraFocalPlaneDist = aFocalDist;
      }
      else
      {
        Message::SendFail() << "Syntax error at argument'" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-aperture")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aParam(theArgVec[anArgIter]);
      if (aParam.IsRealValue (Standard_True))
      {
        float aApertureSize = static_cast<float> (aParam.RealValue());
        if (aApertureSize < 0)
        {
          Message::SendFail() << "Error: parameter can't be negative at argument '" << anArg << "'";
          return 1;
        }
        aView->ChangeRenderingParams().CameraApertureRadius = aApertureSize;
      }
      else
      {
        Message::SendFail() << "Syntax error at argument'" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-exposure")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString anExposure (theArgVec[anArgIter]);
      if (anExposure.IsRealValue (Standard_True))
      {
        aView->ChangeRenderingParams().Exposure = static_cast<float> (anExposure.RealValue());
      }
      else
      {
        Message::SendFail() << "Syntax error at argument'" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-whitepoint")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aWhitePoint (theArgVec[anArgIter]);
      if (aWhitePoint.IsRealValue (Standard_True))
      {
        aView->ChangeRenderingParams().WhitePoint = static_cast<float> (aWhitePoint.RealValue());
      }
      else
      {
        Message::SendFail() << "Syntax error at argument'" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-tonemapping")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aMode (theArgVec[anArgIter]);
      aMode.LowerCase();

      if (aMode == "disabled")
      {
        aView->ChangeRenderingParams().ToneMappingMethod = Graphic3d_ToneMappingMethod_Disabled;
      }
      else if (aMode == "filmic")
      {
        aView->ChangeRenderingParams().ToneMappingMethod = Graphic3d_ToneMappingMethod_Filmic;
      }
      else
      {
        Message::SendFail() << "Syntax error at argument'" << anArg << "'";
        return 1;
      }
    }
    else if (aFlag == "-performancestats"
          || aFlag == "-performancecounters"
          || aFlag == "-perfstats"
          || aFlag == "-perfcounters"
          || aFlag == "-stats")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }

      TCollection_AsciiString aFlagsStr (theArgVec[anArgIter]);
      aFlagsStr.LowerCase();
      Graphic3d_RenderingParams::PerfCounters aFlags = aView->ChangeRenderingParams().CollectedStats;
      if (!convertToPerfStatsFlags (aFlagsStr, aFlags))
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      aView->ChangeRenderingParams().CollectedStats = aFlags;
      aView->ChangeRenderingParams().ToShowStats = aFlags != Graphic3d_RenderingParams::PerfCounters_NONE;
    }
    else if (aFlag == "-perfupdateinterval"
          || aFlag == "-statsupdateinterval")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      aView->ChangeRenderingParams().StatsUpdateInterval = (Standard_ShortReal )Draw::Atof (theArgVec[anArgIter]);
    }
    else if (aFlag == "-perfchart"
          || aFlag == "-statschart")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      aView->ChangeRenderingParams().StatsNbFrames = Draw::Atoi (theArgVec[anArgIter]);
    }
    else if (aFlag == "-perfchartmax"
          || aFlag == "-statschartmax")
    {
      if (++anArgIter >= theArgNb)
      {
        Message::SendFail() << "Syntax error at argument '" << anArg << "'";
        return 1;
      }
      aView->ChangeRenderingParams().StatsMaxChartTime = (Standard_ShortReal )Draw::Atof (theArgVec[anArgIter]);
    }
    else if (aFlag == "-frustumculling"
          || aFlag == "-culling")
    {
      if (toPrint)
      {
        theDI << ((aParams.FrustumCullingState == Graphic3d_RenderingParams::FrustumCulling_On)  ? "on" :
                  (aParams.FrustumCullingState == Graphic3d_RenderingParams::FrustumCulling_Off) ? "off" :
                                                                                                   "noUpdate") << " ";
        continue;
      }

      Graphic3d_RenderingParams::FrustumCulling aState = Graphic3d_RenderingParams::FrustumCulling_On;
      if (++anArgIter < theArgNb)
      {
        TCollection_AsciiString aStateStr(theArgVec[anArgIter]);
        aStateStr.LowerCase();
        bool toEnable = true;
        if (Draw::ParseOnOff (aStateStr.ToCString(), toEnable))
        {
          aState = toEnable ? Graphic3d_RenderingParams::FrustumCulling_On : Graphic3d_RenderingParams::FrustumCulling_Off;
        }
        else if (aStateStr == "noupdate"
              || aStateStr == "freeze")
        {
          aState = Graphic3d_RenderingParams::FrustumCulling_NoUpdate;
        }
        else
        {
          --anArgIter;
        }
      }
      aParams.FrustumCullingState = aState;
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown flag '" << anArg << "'";
      return 1;
    }
  }

  // set current view parameters as defaults
  if (toSyncDefaults)
  {
    ViewerTest::GetViewerFromContext()->SetDefaultRenderingParams (aParams);
  }
  if (toSyncAllViews)
  {
    for (V3d_ListOfViewIterator aViewIter = ViewerTest::GetViewerFromContext()->DefinedViewIterator(); aViewIter.More(); aViewIter.Next())
    {
      aViewIter.Value()->ChangeRenderingParams() = aParams;
    }
  }
  return 0;
}

//=======================================================================
//function : searchInfo
//purpose  :
//=======================================================================
inline TCollection_AsciiString searchInfo (const TColStd_IndexedDataMapOfStringString& theDict,
                                           const TCollection_AsciiString&              theKey)
{
  for (TColStd_IndexedDataMapOfStringString::Iterator anIter (theDict); anIter.More(); anIter.Next())
  {
    if (TCollection_AsciiString::IsSameString (anIter.Key(), theKey, Standard_False))
    {
      return anIter.Value();
    }
  }
  return TCollection_AsciiString();
}

//=======================================================================
//function : VStatProfiler
//purpose  :
//=======================================================================
static Standard_Integer VStatProfiler (Draw_Interpretor& theDI,
                                       Standard_Integer  theArgNb,
                                       const char**      theArgVec)
{
  Handle(V3d_View) aView = ViewerTest::CurrentView();
  if (aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  Standard_Boolean toRedraw = Standard_True;
  Graphic3d_RenderingParams::PerfCounters aPrevCounters = aView->ChangeRenderingParams().CollectedStats;
  Standard_ShortReal aPrevUpdInterval = aView->ChangeRenderingParams().StatsUpdateInterval;
  Graphic3d_RenderingParams::PerfCounters aRenderParams = Graphic3d_RenderingParams::PerfCounters_NONE;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
  {
    Standard_CString        anArg (theArgVec[anArgIter]);
    TCollection_AsciiString aFlag (anArg);
    aFlag.LowerCase();
    if (aFlag == "-noredraw")
    {
      toRedraw = Standard_False;
    }
    else
    {
      Graphic3d_RenderingParams::PerfCounters aParam = Graphic3d_RenderingParams::PerfCounters_NONE;
      if      (aFlag == "fps")        aParam = Graphic3d_RenderingParams::PerfCounters_FrameRate;
      else if (aFlag == "cpu")        aParam = Graphic3d_RenderingParams::PerfCounters_CPU;
      else if (aFlag == "alllayers"
            || aFlag == "layers")     aParam = Graphic3d_RenderingParams::PerfCounters_Layers;
      else if (aFlag == "allstructs"
            || aFlag == "allstructures"
            || aFlag == "structs"
            || aFlag == "structures") aParam = Graphic3d_RenderingParams::PerfCounters_Structures;
      else if (aFlag == "groups")     aParam = Graphic3d_RenderingParams::PerfCounters_Groups;
      else if (aFlag == "allarrays"
            || aFlag == "fillarrays"
            || aFlag == "linearrays"
            || aFlag == "pointarrays"
            || aFlag == "textarrays") aParam = Graphic3d_RenderingParams::PerfCounters_GroupArrays;
      else if (aFlag == "triangles")  aParam = Graphic3d_RenderingParams::PerfCounters_Triangles;
      else if (aFlag == "lines")      aParam = Graphic3d_RenderingParams::PerfCounters_Lines;
      else if (aFlag == "points")     aParam = Graphic3d_RenderingParams::PerfCounters_Points;
      else if (aFlag == "geommem"
            || aFlag == "texturemem"
            || aFlag == "framemem")   aParam = Graphic3d_RenderingParams::PerfCounters_EstimMem;
      else if (aFlag == "elapsedframe"
            || aFlag == "cpuframeaverage"
            || aFlag == "cpupickingaverage"
            || aFlag == "cpucullingaverage"
            || aFlag == "cpudynaverage"
            || aFlag == "cpuframemax"
            || aFlag == "cpupickingmax"
            || aFlag == "cpucullingmax"
            || aFlag == "cpudynmax")  aParam = Graphic3d_RenderingParams::PerfCounters_FrameTime;
      else
      {
        Message::SendFail() << "Error: unknown argument '" << theArgVec[anArgIter] << "'";
        continue;
      }

      aRenderParams = Graphic3d_RenderingParams::PerfCounters (aRenderParams | aParam);
    }
  }

  if (aRenderParams != Graphic3d_RenderingParams::PerfCounters_NONE)
  {
    aView->ChangeRenderingParams().CollectedStats =
      Graphic3d_RenderingParams::PerfCounters (aView->RenderingParams().CollectedStats | aRenderParams);

    if (toRedraw)
    {
      aView->ChangeRenderingParams().StatsUpdateInterval = -1;
      aView->Redraw();
      aView->ChangeRenderingParams().StatsUpdateInterval = aPrevUpdInterval;
    }

    TColStd_IndexedDataMapOfStringString aDict;
    aView->StatisticInformation (aDict);

    aView->ChangeRenderingParams().CollectedStats = aPrevCounters;

    for (Standard_Integer anArgIter = 1; anArgIter < theArgNb; ++anArgIter)
    {
      Standard_CString        anArg(theArgVec[anArgIter]);
      TCollection_AsciiString aFlag(anArg);
      aFlag.LowerCase();
      if (aFlag == "fps")
      {
        theDI << searchInfo (aDict, "FPS") << " ";
      }
      else if (aFlag == "cpu")
      {
        theDI << searchInfo (aDict, "CPU FPS") << " ";
      }
      else if (aFlag == "alllayers")
      {
        theDI << searchInfo (aDict, "Layers") << " ";
      }
      else if (aFlag == "layers")
      {
        theDI << searchInfo (aDict, "Rendered layers") << " ";
      }
      else if (aFlag == "allstructs"
            || aFlag == "allstructures")
      {
        theDI << searchInfo (aDict, "Structs") << " ";
      }
      else if (aFlag == "structs"
            || aFlag == "structures")
      {
        TCollection_AsciiString aRend = searchInfo (aDict, "Rendered structs");
        if (aRend.IsEmpty()) // all structures rendered
        {
          aRend = searchInfo (aDict, "Structs");
        }
        theDI << aRend << " ";
      }
      else if (aFlag == "groups")
      {
        theDI << searchInfo (aDict, "Rendered groups") << " ";
      }
      else if (aFlag == "allarrays")
      {
        theDI << searchInfo (aDict, "Rendered arrays") << " ";
      }
      else if (aFlag == "fillarrays")
      {
        theDI << searchInfo (aDict, "Rendered [fill] arrays") << " ";
      }
      else if (aFlag == "linearrays")
      {
        theDI << searchInfo (aDict, "Rendered [line] arrays") << " ";
      }
      else if (aFlag == "pointarrays")
      {
        theDI << searchInfo (aDict, "Rendered [point] arrays") << " ";
      }
      else if (aFlag == "textarrays")
      {
        theDI << searchInfo (aDict, "Rendered [text] arrays") << " ";
      }
      else if (aFlag == "triangles")
      {
        theDI << searchInfo (aDict, "Rendered triangles") << " ";
      }
      else if (aFlag == "points")
      {
        theDI << searchInfo (aDict, "Rendered points") << " ";
      }
      else if (aFlag == "geommem")
      {
        theDI << searchInfo (aDict, "GPU Memory [geometry]") << " ";
      }
      else if (aFlag == "texturemem")
      {
        theDI << searchInfo (aDict, "GPU Memory [textures]") << " ";
      }
      else if (aFlag == "framemem")
      {
        theDI << searchInfo (aDict, "GPU Memory [frames]") << " ";
      }
      else if (aFlag == "elapsedframe")
      {
        theDI << searchInfo (aDict, "Elapsed Frame (average)") << " ";
      }
      else if (aFlag == "cpuframe_average")
      {
        theDI << searchInfo (aDict, "CPU Frame (average)") << " ";
      }
      else if (aFlag == "cpupicking_average")
      {
        theDI << searchInfo (aDict, "CPU Picking (average)") << " ";
      }
      else if (aFlag == "cpuculling_average")
      {
        theDI << searchInfo (aDict, "CPU Culling (average)") << " ";
      }
      else if (aFlag == "cpudyn_average")
      {
        theDI << searchInfo (aDict, "CPU Dynamics (average)") << " ";
      }
      else if (aFlag == "cpuframe_max")
      {
        theDI << searchInfo (aDict, "CPU Frame (max)") << " ";
      }
      else if (aFlag == "cpupicking_max")
      {
        theDI << searchInfo (aDict, "CPU Picking (max)") << " ";
      }
      else if (aFlag == "cpuculling_max")
      {
        theDI << searchInfo (aDict, "CPU Culling (max)") << " ";
      }
      else if (aFlag == "cpudyn_max")
      {
        theDI << searchInfo (aDict, "CPU Dynamics (max)") << " ";
      }
    }
  }
  else
  {
    if (toRedraw)
    {
      aView->ChangeRenderingParams().StatsUpdateInterval = -1;
      aView->Redraw();
      aView->ChangeRenderingParams().StatsUpdateInterval = aPrevUpdInterval;
    }
    theDI << "Statistic info:\n" << aView->StatisticInformation();
  }
  return 0;
}

//=======================================================================
//function : VXRotate
//purpose  :
//=======================================================================
static Standard_Integer VXRotate (Draw_Interpretor& di,
                                   Standard_Integer argc,
                                   const char ** argv)
{
  Handle(AIS_InteractiveContext) aContext = ViewerTest::GetAISContext();
  if (aContext.IsNull())
  {
    di << argv[0] << "ERROR : use 'vinit' command before \n";
    return 1;
  }

  if (argc != 3)
  {
    di << "ERROR : Usage : " << argv[0] << " name angle\n";
    return 1;
  }

  TCollection_AsciiString aName (argv[1]);
  Standard_Real anAngle = Draw::Atof (argv[2]);

  // find object
  ViewerTest_DoubleMapOfInteractiveAndName& aMap = GetMapOfAIS();
  Handle(AIS_InteractiveObject) anIObj;
  if (!aMap.Find2 (aName, anIObj))
  {
    di << "Use 'vdisplay' before\n";
    return 1;
  }

  gp_Trsf aTransform;
  aTransform.SetRotation (gp_Ax1 (gp_Pnt (0.0, 0.0, 0.0), gp_Vec (1.0, 0.0, 0.0)), anAngle);
  aTransform.SetTranslationPart (anIObj->LocalTransformation().TranslationPart());

  aContext->SetLocation (anIObj, aTransform);
  aContext->UpdateCurrentViewer();
  return 0;
}

namespace
{
  //! Structure for setting AIS_Manipulator::SetPart() property.
  struct ManipAxisModeOnOff
  {
    Standard_Integer    Axis;
    AIS_ManipulatorMode Mode;
    Standard_Boolean    ToEnable;

    ManipAxisModeOnOff() : Axis (-1), Mode (AIS_MM_None), ToEnable (false) {}
  };

  enum ManipAjustPosition
  {
    ManipAjustPosition_Off,
    ManipAjustPosition_Center,
    ManipAjustPosition_Location,
    ManipAjustPosition_ShapeLocation,
  };
}

//===============================================================================================
//function : VManipulator
//purpose  :
//===============================================================================================
static int VManipulator (Draw_Interpretor& theDi,
                         Standard_Integer  theArgsNb,
                         const char**      theArgVec)
{
  Handle(V3d_View)   aCurrentView   = ViewerTest::CurrentView();
  Handle(V3d_Viewer) aViewer = ViewerTest::GetViewerFromContext();
  if (aCurrentView.IsNull()
   || aViewer.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  ViewerTest_AutoUpdater anUpdateTool (ViewerTest::GetAISContext(), ViewerTest::CurrentView());
  Standard_Integer anArgIter = 1;
  Handle(AIS_Manipulator) aManipulator;
  ViewerTest_DoubleMapOfInteractiveAndName& aMapAIS = GetMapOfAIS();
  TCollection_AsciiString aName;
  // parameters
  Standard_Integer toAutoActivate = -1, toFollowTranslation = -1, toFollowRotation = -1, toFollowDragging = -1, isZoomable = -1;
  Standard_Real aGap = -1.0, aSize = -1.0;
  NCollection_Sequence<ManipAxisModeOnOff> aParts;
  gp_XYZ aLocation (RealLast(), RealLast(), RealLast()), aVDir, anXDir;
  //
  bool toDetach = false;
  AIS_Manipulator::OptionsForAttach anAttachOptions;
  Handle(AIS_InteractiveObject) anAttachObject;
  Handle(V3d_View) aViewAffinity;
  ManipAjustPosition anAttachPos = ManipAjustPosition_Off;
  //
  Graphic3d_Vec2i aMousePosFrom(IntegerLast(), IntegerLast());
  Graphic3d_Vec2i aMousePosTo  (IntegerLast(), IntegerLast());
  Standard_Integer toStopMouseTransform = -1;
  // explicit transformation
  gp_Trsf aTrsf;
  gp_XYZ aTmpXYZ;
  Standard_Real aTmpReal = 0.0;
  gp_XYZ aRotPnt, aRotAxis;
  for (; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      continue;
    }
    else if (anArg == "-help")
    {
      theDi.PrintHelp (theArgVec[0]);
      return 0;
    }
    //
    else if (anArg == "-autoactivate"
          || anArg == "-noautoactivate")
    {
      toAutoActivate = Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0;
    }
    else if (anArg == "-followtranslation"
          || anArg == "-nofollowtranslation")
    {
      toFollowTranslation = Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0;
    }
    else if (anArg == "-followrotation"
          || anArg == "-nofollowrotation")
    {
      toFollowRotation = Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0;
    }
    else if (anArg == "-followdragging"
          || anArg == "-nofollowdragging")
    {
      toFollowDragging = Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0;
    }
    else if (anArg == "-gap"
          && anArgIter + 1 < theArgsNb
          && Draw::ParseReal (theArgVec[anArgIter + 1], aGap)
          && aGap >= 0.0)
    {
      ++anArgIter;
    }
    else if (anArg == "-size"
          && anArgIter + 1 < theArgsNb
          && Draw::ParseReal (theArgVec[anArgIter + 1], aSize)
          && aSize > 0.0)
    {
      ++anArgIter;
    }
    else if ((anArg == "-part"  && anArgIter + 3 < theArgsNb)
          || (anArg == "-parts" && anArgIter + 2 < theArgsNb))
    {
      ManipAxisModeOnOff aPart;
      Standard_Integer aMode = 0;
      if (anArg == "-part")
      {
        if (!Draw::ParseInteger (theArgVec[++anArgIter], aPart.Axis)
          || aPart.Axis < 0 || aPart.Axis > 3)
        {
          Message::SendFail() << "Syntax error: -part axis '" << theArgVec[anArgIter] << "' is out of range [1, 3]";
          return 1;
        }
      }
      if (!Draw::ParseInteger (theArgVec[++anArgIter], aMode)
        || aMode < 1 || aMode > 4)
      {
        Message::SendFail() << "Syntax error: -part mode '" << theArgVec[anArgIter] << "' is out of range [1, 4]";
        return 1;
      }
      if (!Draw::ParseOnOff (theArgVec[++anArgIter], aPart.ToEnable))
      {
        Message::SendFail() << "Syntax error: -part value on/off '" << theArgVec[anArgIter] << "' is incorrect";
        return 1;
      }
      aPart.Mode = static_cast<AIS_ManipulatorMode> (aMode);
      aParts.Append (aPart);
    }
    else if (anArg == "-pos"
          && anArgIter + 3 < theArgsNb
          && parseXYZ (theArgVec + anArgIter + 1, aLocation))
    {
      anArgIter += 3;
      if (anArgIter + 3 < theArgsNb
       && parseXYZ (theArgVec + anArgIter + 1, aVDir)
       && aVDir.Modulus() > Precision::Confusion())
      {
        anArgIter += 3;
      }
      if (anArgIter + 3 < theArgsNb
       && parseXYZ (theArgVec + anArgIter + 1, anXDir)
       && anXDir.Modulus() > Precision::Confusion())
      {
        anArgIter += 3;
      }
    }
    else if (anArg == "-zoomable"
          || anArg == "-notzoomable")
    {
      isZoomable = Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0;
    }
    //
    else if (anArg == "-adjustposition"
          || anArg == "-noadjustposition")
    {
      anAttachPos = ManipAjustPosition_Center;
      if (anArgIter + 1 < theArgsNb)
      {
        TCollection_AsciiString aPosName (theArgVec[++anArgIter]);
        aPosName.LowerCase();
        if (aPosName == "0")
        {
          anAttachPos = ManipAjustPosition_Off;
        }
        else if (aPosName == "1"
              || aPosName == "center")
        {
          anAttachPos = ManipAjustPosition_Center;
        }
        else if (aPosName == "transformation"
              || aPosName == "trsf"
              || aPosName == "location"
              || aPosName == "loc")
        {
          anAttachPos = ManipAjustPosition_Location;
        }
        else if (aPosName == "shapelocation"
              || aPosName == "shapeloc")
        {
          anAttachPos = ManipAjustPosition_ShapeLocation;
        }
        else
        {
          --anArgIter;
        }
      }
      anAttachOptions.SetAdjustPosition (anAttachPos == ManipAjustPosition_Center);
    }
    else if (anArg == "-adjustsize"
          || anArg == "-noadjustsize")
    {
      anAttachOptions.SetAdjustSize (Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0);
    }
    else if (anArg == "-enablemodes"
          || anArg == "-enablemodes")
    {
      anAttachOptions.SetEnableModes (Draw::ParseOnOffNoIterator (theArgsNb, theArgVec, anArgIter) ? 1 : 0);
    }
    //
    else if (anArg == "-starttransform"
          && anArgIter + 2 < theArgsNb
          && Draw::ParseInteger (theArgVec[anArgIter + 1], aMousePosFrom.x())
          && Draw::ParseInteger (theArgVec[anArgIter + 2], aMousePosFrom.y()))
    {
      anArgIter += 2;
    }
    else if (anArg == "-transform"
          && anArgIter + 2 < theArgsNb
          && Draw::ParseInteger (theArgVec[anArgIter + 1], aMousePosTo.x())
          && Draw::ParseInteger (theArgVec[anArgIter + 2], aMousePosTo.y()))
    {
      anArgIter += 2;
    }
    else if (anArg == "-stoptransform")
    {
      toStopMouseTransform = 1;
      if (anArgIter + 1 < theArgsNb
       && TCollection_AsciiString::IsSameString (theArgVec[anArgIter + 1], "abort", false))
      {
        ++anArgIter;
        toStopMouseTransform = 0;
      }
    }
    //
    else if (anArg == "-move"
          && anArgIter + 3 < theArgsNb
          && parseXYZ (theArgVec + anArgIter + 1, aTmpXYZ))
    {
      anArgIter += 3;
      aTrsf.SetTranslationPart (aTmpXYZ);
    }
    else if (anArg == "-scale"
          && anArgIter + 1 < theArgsNb
          && Draw::ParseReal (theArgVec[anArgIter + 1], aTmpReal))
    {
      ++anArgIter;
      aTrsf.SetScale (gp_Pnt(), aTmpReal);
    }
    else if (anArg == "-rotate"
          && anArgIter + 7 < theArgsNb
          && parseXYZ (theArgVec + anArgIter + 1, aRotPnt)
          && parseXYZ (theArgVec + anArgIter + 4, aRotAxis)
          && Draw::ParseReal (theArgVec[anArgIter + 7], aTmpReal))
    {
      anArgIter += 7;
      aTrsf.SetRotation (gp_Ax1 (gp_Pnt (aRotPnt), gp_Dir (aRotAxis)), aTmpReal);
    }
    //
    else if (anArg == "-detach")
    {
      toDetach = true;
    }
    else if (anArg == "-attach"
          && anArgIter + 1 < theArgsNb)
    {
      TCollection_AsciiString anObjName (theArgVec[++anArgIter]);
      if (!aMapAIS.Find2 (anObjName, anAttachObject))
      {
        Message::SendFail() << "Syntax error: AIS object '" << anObjName << "' does not exist";
        return 1;
      }

      for (ViewerTest_DoubleMapIteratorOfDoubleMapOfInteractiveAndName anIter (aMapAIS); anIter.More(); anIter.Next())
      {
        Handle(AIS_Manipulator) aManip = Handle(AIS_Manipulator)::DownCast (anIter.Key1());
        if (!aManip.IsNull()
          && aManip->IsAttached()
          && aManip->Object() == anAttachObject)
        {
          Message::SendFail() << "Syntax error: AIS object '" << anObjName << "' already has manipulator";
          return 1;
        }
      }
    }
    else if (anArg == "-view"
          && anArgIter + 1 < theArgsNb
          && aViewAffinity.IsNull())
    {
      TCollection_AsciiString aViewString (theArgVec[++anArgIter]);
      if (aViewString == "active")
      {
        aViewAffinity = ViewerTest::CurrentView();
      }
      else // Check view name
      {
        ViewerTest_Names aViewNames (aViewString);
        if (!ViewerTest_myViews.IsBound1 (aViewNames.GetViewName()))
        {
          Message::SendFail() << "Syntax error: wrong view name '" << aViewString << "'";
          return 1;
        }
        aViewAffinity = ViewerTest_myViews.Find1 (aViewNames.GetViewName());
        if (aViewAffinity.IsNull())
        {
          Message::SendFail() << "Syntax error: cannot find view with name '" << aViewString << "'";
          return 1;
        }
      }
    }
    else if (aName.IsEmpty())
    {
      aName = theArgVec[anArgIter];
      if (!aMapAIS.IsBound2 (aName))
      {
        aManipulator = new AIS_Manipulator();
        aManipulator->SetModeActivationOnDetection (true);
        aMapAIS.Bind (aManipulator, aName);
      }
      else
      {
        aManipulator = Handle(AIS_Manipulator)::DownCast (aMapAIS.Find2 (aName));
        if (aManipulator.IsNull())
        {
          Message::SendFail() << "Syntax error: \"" << aName << "\" is not an AIS manipulator";
          return 1;
        }
      }
    }
    else
    {
      theDi << "Syntax error: unknown argument '" << theArgVec[anArgIter] << "'";
    }
  }

  if (aName.IsEmpty())
  {
    Message::SendFail ("Syntax error: please specify AIS manipulator's name as the first argument");
    return 1;
  }
  if (!toDetach
    && aManipulator.IsNull())
  {
    aManipulator = new AIS_Manipulator();
    aManipulator->SetModeActivationOnDetection (true);
    aMapAIS.Bind (aManipulator, aName);
  }

  // -----------------------------------------
  // change properties of manipulator instance
  // -----------------------------------------

  if (toAutoActivate != -1)
  {
    aManipulator->SetModeActivationOnDetection (toAutoActivate == 1);
  }
  if (toFollowTranslation != -1)
  {
    aManipulator->ChangeTransformBehavior().SetFollowTranslation (toFollowTranslation == 1);
  }
  if (toFollowRotation != -1)
  {
    aManipulator->ChangeTransformBehavior().SetFollowRotation (toFollowRotation == 1);
  }
  if (toFollowDragging != -1)
  {
    aManipulator->ChangeTransformBehavior().SetFollowDragging (toFollowDragging == 1);
  }
  if (aGap >= 0.0f)
  {
    aManipulator->SetGap ((float )aGap);
  }

  for (NCollection_Sequence<ManipAxisModeOnOff>::Iterator aPartIter (aParts); aPartIter.More(); aPartIter.Next())
  {
    const ManipAxisModeOnOff& aPart = aPartIter.Value();
    if (aPart.Axis == -1)
    {
      aManipulator->SetPart (aPart.Mode, aPart.ToEnable);
    }
    else
    {
      aManipulator->SetPart (aPart.Axis, aPart.Mode, aPart.ToEnable);
    }
  }

  if (aSize > 0.0)
  {
    aManipulator->SetSize ((float )aSize);
  }
  if (isZoomable != -1)
  {
    aManipulator->SetZoomPersistence (isZoomable == 0);

    if (ViewerTest::GetAISContext()->IsDisplayed (aManipulator))
    {
      ViewerTest::GetAISContext()->Remove  (aManipulator, Standard_False);
      ViewerTest::GetAISContext()->Display (aManipulator, Standard_False);
    }
  }

  // ----------------------------------
  // detach existing manipulator object
  // ----------------------------------

  if (toDetach)
  {
    aManipulator->Detach();
    aMapAIS.UnBind2 (aName);
    ViewerTest::GetAISContext()->Remove (aManipulator, false);
  }

  // ---------------------------------------------------
  // attach, detach or access manipulator from an object
  // ---------------------------------------------------

  if (!anAttachObject.IsNull())
  {
    aManipulator->Attach (anAttachObject, anAttachOptions);
  }
  if (!aViewAffinity.IsNull())
  {
    for (NCollection_DoubleMap <TCollection_AsciiString, Handle(V3d_View)>::Iterator anIter (ViewerTest_myViews);
         anIter.More(); anIter.Next())
    {
      ViewerTest::GetAISContext()->SetViewAffinity (aManipulator, anIter.Value(), false);
    }
    ViewerTest::GetAISContext()->SetViewAffinity (aManipulator, aViewAffinity, true);
  }

  if (anAttachPos != ManipAjustPosition_Off
   && aManipulator->IsAttached()
   && (anAttachObject.IsNull() || anAttachPos != ManipAjustPosition_Center))
  {
    gp_Ax2 aPosition = gp::XOY();
    const gp_Trsf aBaseTrsf = aManipulator->Object()->LocalTransformation();
    switch (anAttachPos)
    {
      case ManipAjustPosition_Off:
      {
        break;
      }
      case ManipAjustPosition_Location:
      {
        aPosition = gp::XOY().Transformed (aBaseTrsf);
        break;
      }
      case ManipAjustPosition_ShapeLocation:
      {
        if (Handle(AIS_Shape) aShapePrs = Handle(AIS_Shape)::DownCast (aManipulator->Object()))
        {
          aPosition = gp::XOY().Transformed (aBaseTrsf * aShapePrs->Shape().Location());
        }
        else
        {
          Message::SendFail() << "Syntax error: manipulator is not attached to shape";
          return 1;
        }
        break;
      }
      case ManipAjustPosition_Center:
      {
        Bnd_Box aBox;
        for (AIS_ManipulatorObjectSequence::Iterator anObjIter (*aManipulator->Objects()); anObjIter.More(); anObjIter.Next())
        {
          Bnd_Box anObjBox;
          anObjIter.Value()->BoundingBox (anObjBox);
          aBox.Add (anObjBox);
        }
        aBox = aBox.FinitePart();
        if (!aBox.IsVoid())
        {
          const gp_Pnt aCenter = (aBox.CornerMin().XYZ() + aBox.CornerMax().XYZ()) * 0.5;
          aPosition.SetLocation (aCenter);
        }
        break;
      }
    }
    aManipulator->SetPosition (aPosition);
  }
  if (!Precision::IsInfinite (aLocation.X()))
  {
    if (aVDir.Modulus() <= Precision::Confusion())
    {
      aVDir = aManipulator->Position().Direction().XYZ();
    }
    if (anXDir.Modulus() <= Precision::Confusion())
    {
      anXDir = aManipulator->Position().XDirection().XYZ();
    }
    aManipulator->SetPosition (gp_Ax2 (gp_Pnt (aLocation), gp_Dir (aVDir), gp_Dir (anXDir)));
  }

  // --------------------------------------
  // apply transformation using manipulator
  // --------------------------------------

  if (aMousePosFrom.x() != IntegerLast())
  {
    aManipulator->StartTransform (aMousePosFrom.x(), aMousePosFrom.y(), ViewerTest::CurrentView());
  }
  if (aMousePosTo.x() != IntegerLast())
  {
    aManipulator->Transform (aMousePosTo.x(), aMousePosTo.y(), ViewerTest::CurrentView());
  }
  if (toStopMouseTransform != -1)
  {
    aManipulator->StopTransform (toStopMouseTransform == 1);
  }

  if (aTrsf.Form() != gp_Identity)
  {
    aManipulator->Transform (aTrsf);
  }

  if (ViewerTest::GetAISContext()->IsDisplayed (aManipulator))
  {
    ViewerTest::GetAISContext()->Redisplay (aManipulator, true);
  }
  return 0;
}

//===============================================================================================
//function : VSelectionProperties
//purpose  :
//===============================================================================================
static int VSelectionProperties (Draw_Interpretor& theDi,
                                 Standard_Integer  theArgsNb,
                                 const char**      theArgVec)
{
  const Handle(AIS_InteractiveContext)& aCtx = ViewerTest::GetAISContext();
  if (aCtx.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  if (TCollection_AsciiString (theArgVec[0]) == "vhighlightselected")
  {
    // handle obsolete alias
    bool toEnable = true;
    if (theArgsNb < 2)
    {
      theDi << (aCtx->ToHilightSelected() ? "on" : "off");
      return 0;
    }
    else if (theArgsNb != 2
         || !Draw::ParseOnOff (theArgVec[1], toEnable))
    {
      Message::SendFail ("Syntax error: wrong number of parameters");
      return 1;
    }
    if (toEnable != aCtx->ToHilightSelected())
    {
      aCtx->ClearDetected();
      aCtx->SetToHilightSelected (toEnable);
    }
    return 0;
  }

  Standard_Boolean toPrint  = theArgsNb == 1;
  Standard_Boolean toRedraw = Standard_False;
  Standard_Integer anArgIter = 1;
  Prs3d_TypeOfHighlight aType = Prs3d_TypeOfHighlight_None;
  if (anArgIter < theArgsNb)
  {
    TCollection_AsciiString anArgFirst (theArgVec[anArgIter]);
    anArgFirst.LowerCase();
    ++anArgIter;
    if (anArgFirst == "dynhighlight"
     || anArgFirst == "dynhilight"
     || anArgFirst == "dynamichighlight"
     || anArgFirst == "dynamichilight")
    {
      aType = Prs3d_TypeOfHighlight_Dynamic;
    }
    else if (anArgFirst == "localdynhighlight"
          || anArgFirst == "localdynhilight"
          || anArgFirst == "localdynamichighlight"
          || anArgFirst == "localdynamichilight")
    {
      aType = Prs3d_TypeOfHighlight_LocalDynamic;
    }
    else if (anArgFirst == "selhighlight"
          || anArgFirst == "selhilight"
          || anArgFirst == "selectedhighlight"
          || anArgFirst == "selectedhilight")
    {
      aType = Prs3d_TypeOfHighlight_Selected;
    }
    else if (anArgFirst == "localselhighlight"
          || anArgFirst == "localselhilight"
          || anArgFirst == "localselectedhighlight"
          || anArgFirst == "localselectedhilight")
    {
      aType = Prs3d_TypeOfHighlight_LocalSelected;
    }
    else
    {
      --anArgIter;
    }
  }
  for (; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anArg == "-help")
    {
      theDi.PrintHelp (theArgVec[0]);
      return 0;
    }
    else if (anArg == "-print")
    {
      toPrint = Standard_True;
    }
    else if (anArg == "-autoactivate")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      aCtx->SetAutoActivateSelection (toEnable);
    }
    else if (anArg == "-automatichighlight"
          || anArg == "-automatichilight"
          || anArg == "-autohighlight"
          || anArg == "-autohilight")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      aCtx->ClearSelected (false);
      aCtx->ClearDetected();
      aCtx->SetAutomaticHilight (toEnable);
      toRedraw = true;
    }
    else if (anArg == "-highlightselected"
          || anArg == "-hilightselected")
    {
      Standard_Boolean toEnable = Standard_True;
      if (anArgIter + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toEnable))
      {
        ++anArgIter;
      }
      aCtx->ClearDetected();
      aCtx->SetToHilightSelected (toEnable);
      toRedraw = true;
    }
    else if (anArg == "-pickstrategy"
          || anArg == "-pickingstrategy")
    {
      if (++anArgIter >= theArgsNb)
      {
        Message::SendFail ("Syntax error: type of highlighting is undefined");
        return 1;
      }

      SelectMgr_PickingStrategy aStrategy = SelectMgr_PickingStrategy_FirstAcceptable;
      TCollection_AsciiString aVal (theArgVec[anArgIter]);
      aVal.LowerCase();
      if (aVal == "first"
       || aVal == "firstaccepted"
       || aVal == "firstacceptable")
      {
        aStrategy = SelectMgr_PickingStrategy_FirstAcceptable;
      }
      else if (aVal == "topmost"
            || aVal == "onlyTopmost")
      {
        aStrategy = SelectMgr_PickingStrategy_OnlyTopmost;
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown picking strategy '" << aVal << "'";
        return 1;
      }

      aCtx->SetPickingStrategy (aStrategy);
    }
    else if (anArg == "-pixtol"
          && anArgIter + 1 < theArgsNb)
    {
      aCtx->SetPixelTolerance (Draw::Atoi (theArgVec[++anArgIter]));
    }
    else if (anArg == "-preferclosest")
    {
      bool toPreferClosest = true;
      if (anArgIter + 1 < theArgsNb
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toPreferClosest))
      {
        ++anArgIter;
      }
      aCtx->MainSelector()->SetPickClosest (toPreferClosest);
    }
    else if ((anArg == "-depthtol"
           || anArg == "-depthtolerance")
          && anArgIter + 1 < theArgsNb)
    {
      TCollection_AsciiString aTolType (theArgVec[++anArgIter]);
      aTolType.LowerCase();
      if (aTolType == "uniform")
      {
        if (anArgIter + 1 >= theArgsNb)
        {
          Message::SendFail() << "Syntax error: wrong number of arguments";
          return 1;
        }
        aCtx->MainSelector()->SetDepthTolerance (SelectMgr_TypeOfDepthTolerance_Uniform,
                                                 Draw::Atof (theArgVec[++anArgIter]));
      }
      else if (aTolType == "uniformpx")
      {
        if (anArgIter + 1 >= theArgsNb)
        {
          Message::SendFail() << "Syntax error: wrong number of arguments";
          return 1;
        }
        aCtx->MainSelector()->SetDepthTolerance (SelectMgr_TypeOfDepthTolerance_UniformPixels,
                                                 Draw::Atof (theArgVec[++anArgIter]));
      }
      else if (aTolType == "sensfactor")
      {
        aCtx->MainSelector()->SetDepthTolerance (SelectMgr_TypeOfDepthTolerance_SensitivityFactor, 0.0);
      }
      else
      {
        Message::SendFail() << "Syntax error at '" << aTolType << "'";
        return 1;
      }
    }
    else if ((anArg == "-mode"
           || anArg == "-dispmode")
          && anArgIter + 1 < theArgsNb)
    {
      if (aType == Prs3d_TypeOfHighlight_None)
      {
        Message::SendFail ("Syntax error: type of highlighting is undefined");
        return 1;
      }

      const Standard_Integer aDispMode = Draw::Atoi (theArgVec[++anArgIter]);
      const Handle(Prs3d_Drawer)& aStyle = aCtx->HighlightStyle (aType);
      aStyle->SetDisplayMode (aDispMode);
      toRedraw = Standard_True;
    }
    else if (anArg == "-layer"
          && anArgIter + 1 < theArgsNb)
    {
      if (aType == Prs3d_TypeOfHighlight_None)
      {
        Message::SendFail ("Syntax error: type of highlighting is undefined");
        return 1;
      }

      ++anArgIter;
      Graphic3d_ZLayerId aNewLayer = Graphic3d_ZLayerId_UNKNOWN;
      if (!ViewerTest::ParseZLayer (theArgVec[anArgIter], aNewLayer))
      {
        Message::SendFail() << "Syntax error at " << theArgVec[anArgIter];
        return 1;
      }

      const Handle(Prs3d_Drawer)& aStyle = aCtx->HighlightStyle (aType);
      aStyle->SetZLayer (aNewLayer);
      toRedraw = Standard_True;
    }
    else if (anArg == "-hicolor"
          || anArg == "-selcolor"
          || anArg == "-color")
    {
      if (anArg.StartsWith ("-hi"))
      {
        aType = Prs3d_TypeOfHighlight_Dynamic;
      }
      else if (anArg.StartsWith ("-sel"))
      {
        aType = Prs3d_TypeOfHighlight_Selected;
      }
      else if (aType == Prs3d_TypeOfHighlight_None)
      {
        Message::SendFail ("Syntax error: type of highlighting is undefined");
        return 1;
      }

      Quantity_Color aColor;
      Standard_Integer aNbParsed = Draw::ParseColor (theArgsNb - anArgIter - 1,
                                                     theArgVec + anArgIter + 1,
                                                     aColor);
      if (aNbParsed == 0)
      {
        Message::SendFail ("Syntax error: need more arguments");
        return 1;
      }
      anArgIter += aNbParsed;

      const Handle(Prs3d_Drawer)& aStyle = aCtx->HighlightStyle (aType);
      aStyle->SetColor (aColor);
      toRedraw = Standard_True;
    }
    else if ((anArg == "-transp"
           || anArg == "-transparency"
           || anArg == "-hitransp"
           || anArg == "-seltransp"
           || anArg == "-hitransplocal"
           || anArg == "-seltransplocal")
          && anArgIter + 1 < theArgsNb)
    {
      if (anArg.StartsWith ("-hi"))
      {
        aType = Prs3d_TypeOfHighlight_Dynamic;
      }
      else if (anArg.StartsWith ("-sel"))
      {
        aType = Prs3d_TypeOfHighlight_Selected;
      }
      else if (aType == Prs3d_TypeOfHighlight_None)
      {
        Message::SendFail ("Syntax error: type of highlighting is undefined");
        return 1;
      }

      const Standard_Real aTransp = Draw::Atof (theArgVec[++anArgIter]);
      const Handle(Prs3d_Drawer)& aStyle = aCtx->HighlightStyle (aType);
      aStyle->SetTransparency ((Standard_ShortReal )aTransp);
      toRedraw = Standard_True;
    }
    else if ((anArg == "-mat"
           || anArg == "-material")
          && anArgIter + 1 < theArgsNb)
    {
      if (aType == Prs3d_TypeOfHighlight_None)
      {
        Message::SendFail ("Syntax error: type of highlighting is undefined");
        return 1;
      }

      const Handle(Prs3d_Drawer)& aStyle = aCtx->HighlightStyle (aType);
      Graphic3d_NameOfMaterial aMatName = Graphic3d_MaterialAspect::MaterialFromName (theArgVec[anArgIter + 1]);
      if (aMatName != Graphic3d_NameOfMaterial_DEFAULT)
      {
        ++anArgIter;
        Handle(Graphic3d_AspectFillArea3d) anAspect = new Graphic3d_AspectFillArea3d();
        *anAspect = *aCtx->DefaultDrawer()->ShadingAspect()->Aspect();
        Graphic3d_MaterialAspect aMat (aMatName);
        aMat.SetColor (aStyle->Color());
        aMat.SetTransparency (aStyle->Transparency());
        anAspect->SetFrontMaterial (aMat);
        anAspect->SetInteriorColor (aStyle->Color());
        aStyle->SetBasicFillAreaAspect (anAspect);
      }
      else
      {
        aStyle->SetBasicFillAreaAspect (Handle(Graphic3d_AspectFillArea3d)());
      }
      toRedraw = Standard_True;
    }
    else
    {
      Message::SendFail() << "Syntax error at '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }

  if (toPrint)
  {
    const Handle(Prs3d_Drawer)& aHiStyle  = aCtx->HighlightStyle();
    const Handle(Prs3d_Drawer)& aSelStyle = aCtx->SelectionStyle();
    theDi << "Auto-activation                : " << (aCtx->GetAutoActivateSelection() ? "On" : "Off") << "\n";
    theDi << "Auto-highlight                 : " << (aCtx->AutomaticHilight() ? "On" : "Off") << "\n";
    theDi << "Highlight selected             : " << (aCtx->ToHilightSelected() ? "On" : "Off") << "\n";
    theDi << "Selection pixel tolerance      : " << aCtx->MainSelector()->PixelTolerance() << "\n";
    theDi << "Selection color                : " << Quantity_Color::StringName (aSelStyle->Color().Name()) << "\n";
    theDi << "Dynamic highlight color        : " << Quantity_Color::StringName (aHiStyle->Color().Name()) << "\n";
    theDi << "Selection transparency         : " << aSelStyle->Transparency() << "\n";
    theDi << "Dynamic highlight transparency : " << aHiStyle->Transparency() << "\n";
    theDi << "Selection mode                 : " << aSelStyle->DisplayMode() << "\n";
    theDi << "Dynamic highlight mode         : " << aHiStyle->DisplayMode() << "\n";
    theDi << "Selection layer                : " << aSelStyle->ZLayer() << "\n";
    theDi << "Dynamic layer                  : " << aHiStyle->ZLayer() << "\n";
  }

  if (aCtx->NbSelected() != 0 && toRedraw)
  {
    aCtx->HilightSelected (Standard_True);
  }

  return 0;
}

//===============================================================================================
//function : VDumpSelectionImage
//purpose  :
//===============================================================================================
static int VDumpSelectionImage (Draw_Interpretor& /*theDi*/,
                                Standard_Integer  theArgsNb,
                                const char**      theArgVec)
{
  const Handle(AIS_InteractiveContext)& aContext = ViewerTest::GetAISContext();
  const Handle(V3d_View)& aView = ViewerTest::CurrentView();
  if (aContext.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  TCollection_AsciiString aFile;
  StdSelect_TypeOfSelectionImage aType = StdSelect_TypeOfSelectionImage_NormalizedDepth;
  Handle(Graphic3d_Camera) aCustomCam;
  Image_Format anImgFormat = Image_Format_BGR;
  Standard_Integer aPickedIndex = 1;
  for (Standard_Integer anArgIter = 1; anArgIter < theArgsNb; ++anArgIter)
  {
    TCollection_AsciiString aParam (theArgVec[anArgIter]);
    aParam.LowerCase();
    if (aParam == "-type")
    {
      if (++anArgIter >= theArgsNb)
      {
        Message::SendFail ("Syntax error: wrong number parameters of flag '-type'");
        return 1;
      }

      TCollection_AsciiString aValue (theArgVec[anArgIter]);
      aValue.LowerCase();
      if (aValue == "depth"
       || aValue == "normdepth"
       || aValue == "normalizeddepth")
      {
        aType       = StdSelect_TypeOfSelectionImage_NormalizedDepth;
        anImgFormat = Image_Format_GrayF;
      }
      else if (aValue == "depthinverted"
            || aValue == "normdepthinverted"
            || aValue == "normalizeddepthinverted"
            || aValue == "inverted")
      {
        aType       = StdSelect_TypeOfSelectionImage_NormalizedDepthInverted;
        anImgFormat = Image_Format_GrayF;
      }
      else if (aValue == "unnormdepth"
            || aValue == "unnormalizeddepth")
      {
        aType       = StdSelect_TypeOfSelectionImage_UnnormalizedDepth;
        anImgFormat = Image_Format_GrayF;
      }
      else if (aValue == "objectcolor"
            || aValue == "object"
            || aValue == "color")
      {
        aType = StdSelect_TypeOfSelectionImage_ColoredDetectedObject;
      }
      else if (aValue == "entitycolor"
            || aValue == "entity")
      {
        aType = StdSelect_TypeOfSelectionImage_ColoredEntity;
      }
      else if (aValue == "ownercolor"
            || aValue == "owner")
      {
        aType = StdSelect_TypeOfSelectionImage_ColoredOwner;
      }
      else if (aValue == "selectionmodecolor"
            || aValue == "selectionmode"
            || aValue == "selmodecolor"
            || aValue == "selmode")
      {
        aType = StdSelect_TypeOfSelectionImage_ColoredSelectionMode;
      }
      else if (aValue == "surfnormal"
            || aValue == "surfacenormal"
            || aValue == "normal")
      {
        aType = StdSelect_TypeOfSelectionImage_SurfaceNormal;
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown type '" << aValue << "'";
        return 1;
      }
    }
    else if (aParam == "-picked"
          || aParam == "-pickeddepth"
          || aParam == "-pickedindex")
    {
      if (++anArgIter >= theArgsNb)
      {
        Message::SendFail() << "Syntax error: wrong number parameters at '" << aParam << "'";
        return 1;
      }

      aPickedIndex = Draw::Atoi (theArgVec[anArgIter]);
    }
    else if (anArgIter + 1 < theArgsNb
          && aParam == "-xrpose")
    {
      TCollection_AsciiString anXRArg (theArgVec[++anArgIter]);
      anXRArg.LowerCase();
      if (anXRArg == "base")
      {
        aCustomCam = aView->View()->BaseXRCamera();
      }
      else if (anXRArg == "head")
      {
        aCustomCam = aView->View()->PosedXRCamera();
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown XR pose '" << anXRArg << "'";
        return 1;
      }
      if (aCustomCam.IsNull())
      {
        Message::SendFail() << "Error: undefined XR pose";
        return 0;
      }
    }
    else if (aFile.IsEmpty())
    {
      aFile = theArgVec[anArgIter];
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument '" << theArgVec[anArgIter] << "'";
      return 1;
    }
  }
  if (aFile.IsEmpty())
  {
    Message::SendFail ("Syntax error: image file name is missing");
    return 1;
  }

  Standard_Integer aWidth = 0, aHeight = 0;
  aView->Window()->Size (aWidth, aHeight);

  Image_AlienPixMap aPixMap;
  if (!aPixMap.InitZero (anImgFormat, aWidth, aHeight))
  {
    Message::SendFail ("Error: can't allocate image");
    return 1;
  }

  const bool wasImmUpdate = aView->SetImmediateUpdate (false);
  Handle(Graphic3d_Camera) aCamBack = aView->Camera();
  if (!aCustomCam.IsNull())
  {
    aView->SetCamera (aCustomCam);
  }
  if (!aContext->MainSelector()->ToPixMap (aPixMap, aView, aType, aPickedIndex))
  {
    Message::SendFail ("Error: can't generate selection image");
    return 1;
  }
  if (!aCustomCam.IsNull())
  {
    aView->SetCamera (aCamBack);
  }
  aView->SetImmediateUpdate (wasImmUpdate);

  if (!aPixMap.Save (aFile))
  {
    Message::SendFail ("Error: can't save selection image");
    return 0;
  }
  return 0;
}

//===============================================================================================
//function : VViewCube
//purpose  :
//===============================================================================================
static int VViewCube (Draw_Interpretor& ,
                      Standard_Integer  theNbArgs,
                      const char**      theArgVec)
{
  const Handle(AIS_InteractiveContext)& aContext = ViewerTest::GetAISContext();
  const Handle(V3d_View)& aView = ViewerTest::CurrentView();
  if (aContext.IsNull() || aView.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }
  else if (theNbArgs < 2)
  {
    Message::SendFail ("Syntax error: wrong number arguments");
    return 1;
  }

  Handle(AIS_ViewCube) aViewCube;
  ViewerTest_AutoUpdater anUpdateTool (aContext, aView);
  Quantity_Color aColorRgb;
  TCollection_AsciiString aName;
  for (Standard_Integer anArgIter = 1; anArgIter < theNbArgs; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();
    if (anUpdateTool.parseRedrawMode (anArg))
    {
      //
    }
    else if (aViewCube.IsNull())
    {
      aName = theArgVec[anArgIter];
      if (aName.StartsWith ("-"))
      {
        Message::SendFail ("Syntax error: object name should be specified");
        return 1;
      }
      Handle(AIS_InteractiveObject) aPrs;
      GetMapOfAIS().Find2 (aName, aPrs);
      aViewCube = Handle(AIS_ViewCube)::DownCast (aPrs);
      if (aViewCube.IsNull())
      {
        aViewCube = new AIS_ViewCube();
        aViewCube->SetBoxColor (Quantity_NOC_GRAY50);
        aViewCube->SetViewAnimation (ViewerTest::CurrentEventManager()->ViewAnimation());
        aViewCube->SetFixedAnimationLoop (false);
      }
    }
    else if (anArg == "-reset")
    {
      aViewCube->ResetStyles();
    }
    else if (anArg == "-color"
          || anArg == "-boxcolor"
          || anArg == "-boxsidecolor"
          || anArg == "-sidecolor"
          || anArg == "-boxedgecolor"
          || anArg == "-edgecolor"
          || anArg == "-boxcornercolor"
          || anArg == "-cornercolor"
          || anArg == "-innercolor"
          || anArg == "-textcolor"
          || anArg == "-xaxistextcolor"
          || anArg == "-yaxistextcolor"
          || anArg == "-zaxistextcolor")
    {
      Standard_Integer aNbParsed = Draw::ParseColor (theNbArgs - anArgIter - 1,
                                                     theArgVec + anArgIter + 1,
                                                     aColorRgb);
      if (aNbParsed == 0)
      {
        Message::SendFail() << "Syntax error at '" << anArg << "'";
        return 1;
      }
      anArgIter += aNbParsed;
      if (anArg == "-boxcolor")
      {
        aViewCube->SetBoxColor (aColorRgb);
      }
      else if (anArg == "-boxsidecolor"
            || anArg == "-sidecolor")
      {
        aViewCube->BoxSideStyle()->SetColor (aColorRgb);
        aViewCube->SynchronizeAspects();
      }
      else if (anArg == "-boxedgecolor"
            || anArg == "-edgecolor")
      {
        aViewCube->BoxEdgeStyle()->SetColor (aColorRgb);
        aViewCube->SynchronizeAspects();
      }
      else if (anArg == "-boxcornercolor"
            || anArg == "-cornercolor")
      {
        aViewCube->BoxCornerStyle()->SetColor (aColorRgb);
        aViewCube->SynchronizeAspects();
      }
      else if (anArg == "-innercolor")
      {
        aViewCube->SetInnerColor (aColorRgb);
      }
      else if (anArg == "-textcolor")
      {
        aViewCube->SetTextColor (aColorRgb);
      }
      else if (anArg == "-xaxistextcolor"
            || anArg == "-yaxistextcolor"
            || anArg == "-zaxistextcolor")
      {
        Prs3d_DatumParts aDatum = anArg.Value (2) == 'x'
                                ? Prs3d_DatumParts_XAxis
                                : (anArg.Value (2) == 'y'
                                 ? Prs3d_DatumParts_YAxis
                                 : Prs3d_DatumParts_ZAxis);
        aViewCube->Attributes()->SetOwnDatumAspects();
        aViewCube->Attributes()->DatumAspect()->TextAspect (aDatum)->SetColor (aColorRgb);
      }
      else
      {
        aViewCube->SetColor (aColorRgb);
      }
    }
    else if (anArgIter + 1 < theNbArgs
          && (anArg == "-transparency"
           || anArg == "-boxtransparency"))
    {
      const Standard_Real aValue = Draw::Atof (theArgVec[++anArgIter]);
      if (aValue < 0.0 || aValue > 1.0)
      {
        Message::SendFail() << "Syntax error: invalid transparency value " << theArgVec[anArgIter];
        return 1;
      }

      if (anArg == "-boxtransparency")
      {
        aViewCube->SetBoxTransparency (aValue);
      }
      else
      {
        aViewCube->SetTransparency (aValue);
      }
    }
    else if (anArg == "-axes"
          || anArg == "-edges"
          || anArg == "-vertices"
          || anArg == "-vertexes"
          || anArg == "-fixedanimation")
    {
      bool toShow = true;
      if (anArgIter + 1 < theNbArgs
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], toShow))
      {
        ++anArgIter;
      }
      if (anArg == "-fixedanimation")
      {
        aViewCube->SetFixedAnimationLoop (toShow);
      }
      else if (anArg == "-axes")
      {
        aViewCube->SetDrawAxes (toShow);
      }
      else if (anArg == "-edges")
      {
        aViewCube->SetDrawEdges (toShow);
      }
      else
      {
        aViewCube->SetDrawVertices (toShow);
      }
    }
    else if (anArg == "-yup"
          || anArg == "-zup")
    {
      bool isOn = true;
      if (anArgIter + 1 < theNbArgs
       && Draw::ParseOnOff (theArgVec[anArgIter + 1], isOn))
      {
        ++anArgIter;
      }
      if (anArg == "-yup")
      {
        aViewCube->SetYup (isOn);
      }
      else
      {
        aViewCube->SetYup (!isOn);
      }
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-font")
    {
      aViewCube->SetFont (theArgVec[++anArgIter]);
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-fontheight")
    {
      aViewCube->SetFontHeight (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && (anArg == "-size"
           || anArg == "-boxsize"))
    {
      aViewCube->SetSize (Draw::Atof (theArgVec[++anArgIter]),
                          anArg != "-boxsize");
    }
    else if (anArgIter + 1 < theNbArgs
          && (anArg == "-boxfacet"
           || anArg == "-boxfacetextension"
           || anArg == "-facetextension"
           || anArg == "-extension"))
    {
      aViewCube->SetBoxFacetExtension (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && (anArg == "-boxedgegap"
           || anArg == "-edgegap"))
    {
      aViewCube->SetBoxEdgeGap (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && (anArg == "-boxedgeminsize"
           || anArg == "-edgeminsize"))
    {
      aViewCube->SetBoxEdgeMinSize (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && (anArg == "-boxcornerminsize"
           || anArg == "-cornerminsize"))
    {
      aViewCube->SetBoxCornerMinSize (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-axespadding")
    {
      aViewCube->SetAxesPadding (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-roundradius")
    {
      aViewCube->SetRoundRadius (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-duration")
    {
      aViewCube->SetDuration (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-axesradius")
    {
      aViewCube->SetAxesRadius (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-axesconeradius")
    {
      aViewCube->SetAxesConeRadius (Draw::Atof (theArgVec[++anArgIter]));
    }
    else if (anArgIter + 1 < theNbArgs
          && anArg == "-axessphereradius")
    {
      aViewCube->SetAxesSphereRadius (Draw::Atof (theArgVec[++anArgIter]));
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument '" << anArg << "'";
      return 1;
    }
  }
  if (aViewCube.IsNull())
  {
    Message::SendFail ("Syntax error: wrong number of arguments");
    return 1;
  }

  ViewerTest::Display (aName, aViewCube, false);
  return 0;
}

//===============================================================================================
//function : VColorConvert
//purpose  :
//===============================================================================================
static int VColorConvert (Draw_Interpretor& theDI, Standard_Integer  theNbArgs, const char** theArgVec)
{
  if (theNbArgs != 6)
  {
    std::cerr << "Error: command syntax is incorrect, see help" << std::endl;
    return 1;
  }

  Standard_Boolean convertFrom = (! strcasecmp (theArgVec[1], "from"));
  if (! convertFrom && strcasecmp (theArgVec[1], "to"))
  {
    std::cerr << "Error: first argument must be either \"to\" or \"from\"" << std::endl;
    return 1;
  }

  const char* aTypeStr = theArgVec[2];
  Quantity_TypeOfColor aType = Quantity_TOC_RGB;
  if (! strcasecmp (aTypeStr, "srgb"))
  {
    aType = Quantity_TOC_sRGB;
  }
  else if (! strcasecmp (aTypeStr, "hls"))
  {
    aType = Quantity_TOC_HLS;
  }
  else if (! strcasecmp (aTypeStr, "lab"))
  {
    aType = Quantity_TOC_CIELab;
  }
  else if (! strcasecmp (aTypeStr, "lch"))
  {
    aType = Quantity_TOC_CIELch;
  }
  else
  {
    std::cerr << "Error: unknown colorspace type: " << aTypeStr << std::endl;
    return 1;
  }

  double aC1 = Draw::Atof (theArgVec[3]);
  double aC2 = Draw::Atof (theArgVec[4]);
  double aC3 = Draw::Atof (theArgVec[5]);

  Quantity_Color aColor (aC1, aC2, aC3, convertFrom ? aType : Quantity_TOC_RGB);
  aColor.Values (aC1, aC2, aC3, convertFrom ? Quantity_TOC_RGB : aType);

  // print values with 6 decimal digits
  char buffer[1024];
  Sprintf (buffer, "%.6f %.6f %.6f", aC1, aC2, aC3);
  theDI << buffer;

  return 0;
}
 
//===============================================================================================
//function : VColorDiff
//purpose  :
//===============================================================================================
static int VColorDiff (Draw_Interpretor& theDI, Standard_Integer  theNbArgs, const char** theArgVec)
{
  if (theNbArgs != 7)
  {
    std::cerr << "Error: command syntax is incorrect, see help" << std::endl;
    return 1;
  }

  double aR1 = Draw::Atof (theArgVec[1]);
  double aG1 = Draw::Atof (theArgVec[2]);
  double aB1 = Draw::Atof (theArgVec[3]);
  double aR2 = Draw::Atof (theArgVec[4]);
  double aG2 = Draw::Atof (theArgVec[5]);
  double aB2 = Draw::Atof (theArgVec[6]);

  Quantity_Color aColor1 (aR1, aG1, aB1, Quantity_TOC_RGB);
  Quantity_Color aColor2 (aR2, aG2, aB2, Quantity_TOC_RGB);

  theDI << aColor1.DeltaE2000 (aColor2);

  return 0;
}
 
//===============================================================================================
//function : VSelBvhBuild
//purpose  :
//===============================================================================================
static int VSelBvhBuild (Draw_Interpretor& /*theDI*/, Standard_Integer theNbArgs, const char** theArgVec)
{
  const Handle(AIS_InteractiveContext) aCtx = ViewerTest::GetAISContext();
  if (aCtx.IsNull())
  {
    Message::SendFail ("Error: no active viewer");
    return 1;
  }

  if (theNbArgs < 2)
  {
    Message::SendFail ("Error: command syntax is incorrect, see help");
    return 1;
  }

  Standard_Integer toEnable = -1;
  Standard_Integer aThreadsNb = -1;
  Standard_Boolean toWait = Standard_False;

  for (Standard_Integer anArgIter = 1; anArgIter < theNbArgs; ++anArgIter)
  {
    TCollection_AsciiString anArg (theArgVec[anArgIter]);
    anArg.LowerCase();

    if (anArg == "-nbthreads"
        && anArgIter + 1 < theNbArgs)
    {
      aThreadsNb = Draw::Atoi (theArgVec[++anArgIter]);
      if (aThreadsNb < 1)
      {
        aThreadsNb = Max (1, OSD_Parallel::NbLogicalProcessors() - 1);
      }
    }
    else if (anArg == "-wait")
    {
      toWait = Standard_True;
    }
    else if (toEnable == -1)
    {
      Standard_Boolean toEnableValue = Standard_True;
      if (Draw::ParseOnOff (anArg.ToCString(), toEnableValue))
      {
        toEnable = toEnableValue ? 1 : 0;
      }
      else
      {
        Message::SendFail() << "Syntax error: unknown argument '" << anArg << "'";
        return 1;
      }
    }
    else
    {
      Message::SendFail() << "Syntax error: unknown argument '" << anArg << "'";
      return 1;
    }
  }

  if (aThreadsNb == -1)
  {
    aThreadsNb = 1;
  }
  if (toEnable != -1)
  {
    aCtx->MainSelector()->SetToPrebuildBVH (toEnable == 1, aThreadsNb);
  }
  if (toWait)
  {
    aCtx->MainSelector()->WaitForBVHBuild();
  }

  return 0;
}

//=======================================================================
//function : ViewerTest_ExitProc
//purpose  :
//=======================================================================
static void ViewerTest_ExitProc (ClientData )
{
  NCollection_List<TCollection_AsciiString> aViewList;
  for (NCollection_DoubleMap<TCollection_AsciiString, Handle(V3d_View)>::Iterator anIter (ViewerTest_myViews);
       anIter.More(); anIter.Next())
  {
    aViewList.Append (anIter.Key1());
  }

  for (NCollection_List<TCollection_AsciiString>::Iterator anIter (aViewList);
       anIter.More(); anIter.Next())
  {
    ViewerTest::RemoveView (anIter.Value(), true);
  }
}

//=======================================================================
//function : ViewerCommands
//purpose  :
//=======================================================================

void ViewerTest::ViewerCommands(Draw_Interpretor& theCommands)
{
  static bool TheIsInitialized = false;
  if (TheIsInitialized)
  {
    return;
  }

  TheIsInitialized = true;
  // define destruction callback to destroy views in a well-defined order
  Tcl_CreateExitHandler (ViewerTest_ExitProc, 0);

  const char *group = "ZeViewer";
  theCommands.Add("vdriver",
          "vdriver [-list] [-default DriverName] [-load DriverName]"
    "\n\t\t: Manages active graphic driver factory."
    "\n\t\t: Prints current active driver when called without arguments."
    "\n\t\t: Makes specified driver active when ActiveName argument is specified."
    "\n\t\t:  -list    print registered factories"
    "\n\t\t:  -default define which factory should be used by default (to be used by next vinit call)"
    "\n\t\t:  -load    try loading factory plugin and set it as default one",
                  __FILE__, VDriver, group);
  theCommands.Add("vinit",
          "vinit [-name viewName] [-left leftPx] [-top topPx] [-width widthPx] [-height heightPx]"
    "\n\t\t:     [-exitOnClose] [-closeOnEscape] [-cloneActive] [-virtual {on|off}=off] [-2d_mode {on|off}=off]"
  #if defined(HAVE_XLIB)
    "\n\t\t:     [-display displayName]"
  #endif
    "\n\t\t: Creates new View window with specified name viewName."
    "\n\t\t: By default the new view is created in the viewer and in"
    "\n\t\t: graphic driver shared with active view."
    "\n\t\t:  -name {driverName/viewerName/viewName | viewerName/viewName | viewName}"
    "\n\t\t: If driverName isn't specified the driver will be shared with active view."
    "\n\t\t: If viewerName isn't specified the viewer will be shared with active view."
#if defined(HAVE_XLIB)
    "\n\t\t:  -display HostName.DisplayNumber[:ScreenNumber]"
    "\n\t\t: Display name will be used within creation of graphic driver, when specified."
#endif
    "\n\t\t:  -left,  -top    pixel position of left top corner of the window."
    "\n\t\t:  -width, -height width and height of window respectively."
    "\n\t\t:  -cloneActive flag to copy camera and dimensions of active view."
    "\n\t\t:  -exitOnClose when specified, closing the view will exit application."
    "\n\t\t:  -closeOnEscape when specified, view will be closed on pressing Escape."
    "\n\t\t:  -virtual create an offscreen window within interactive session"
    "\n\t\t:  -2d_mode when on, view will not react on rotate scene events"
    "\n\t\t: Additional commands for operations with views: vclose, vactivate, vviewlist.",
    __FILE__,VInit,group);
  theCommands.Add("vclose" ,
    "[view_id [keep_context=0|1]]\n"
    "or vclose ALL - to remove all created views\n"
    " - removes view(viewer window) defined by its view_id.\n"
    " - keep_context: by default 0; if 1 and the last view is deleted"
    " the current context is not removed.",
    __FILE__,VClose,group);
  theCommands.Add("vactivate" ,
    "vactivate view_id [-noUpdate]"
    " - activates view(viewer window) defined by its view_id",
    __FILE__,VActivate,group);
  theCommands.Add("vviewlist",
    "vviewlist [format={tree, long}]"
    " - prints current list of views per viewer and graphic_driver ID shared between viewers"
    " - format: format of result output, if tree the output is a tree view;"
    "otherwise it's a list of full view names. By default format = tree",
    __FILE__,VViewList,group);
  theCommands.Add("vhelp" ,
    "vhelp            : display help on the viewer commands",
    __FILE__,VHelp,group);
  theCommands.Add("vviewproj",
          "vviewproj [top|bottom|left|right|front|back|axoLeft|axoRight]"
    "\n\t\t:         [+-X+-Y+-Z] [-Zup|-Yup] [-frame +-X+-Y]"
    "\n\t\t: Setup view direction"
    "\n\t\t:   -Yup      use Y-up convention instead of Zup (which is default)."
    "\n\t\t:   +-X+-Y+-Z define direction as combination of DX, DY and DZ;"
    "\n\t\t:             for example '+Z' will show front of the model,"
    "\n\t\t:             '-X-Y+Z' will define left axonometrical view."
    "\n\t\t:   -frame    define camera Up and Right directions (regardless Up convention);"
    "\n\t\t:             for example '+X+Z' will show front of the model with Z-up."
    __FILE__,VViewProj,group);
  theCommands.Add("vtop" ,
    "vtop or <T>      : Top view. Orientation +X+Y" ,
    __FILE__,VViewProj,group);
  theCommands.Add("vbottom" ,
    "vbottom          : Bottom view. Orientation +X-Y" ,
    __FILE__,VViewProj,group);
  theCommands.Add("vleft" ,
    "vleft            : Left view. Orientation -Y+Z" ,
    __FILE__,VViewProj,group);
  theCommands.Add("vright" ,
    "vright           : Right view. Orientation +Y+Z" ,
    __FILE__,VViewProj,group);
  theCommands.Add("vaxo" ,
    " vaxo or <A>     : Axonometric view. Orientation +X-Y+Z",
    __FILE__,VViewProj,group);
  theCommands.Add("vfront" ,
    "vfront           : Front view. Orientation +X+Z" ,
    __FILE__,VViewProj,group);
  theCommands.Add("vback" ,
    "vback            : Back view. Orientation -X+Z" ,
    __FILE__,VViewProj,group);
  theCommands.Add("vpick" ,
    "vpick           : vpick X Y Z [shape subshape] ( all variables as string )",
    VPick,group);
  theCommands.Add("vfit",
    "vfit or <F> [-selected] [-noupdate]"
    "\n\t\t: [-selected] fits the scene according to bounding box of currently selected objects",
    __FILE__,VFit,group);
  theCommands.Add ("vfitarea",
    "vfitarea x1 y1 x2 y2"
    "\n\t\t: vfitarea x1 y1 z1 x2 y2 z2"
    "\n\t\t: Fit view to show area located between two points"
    "\n\t\t: given in world 2D or 3D corrdinates.",
    __FILE__, VFitArea, group);
  theCommands.Add ("vzfit", "vzfit [scale]\n"
    "   Matches Z near, Z far view volume planes to the displayed objects.\n"
    "   \"scale\" - specifies factor to scale computed z range.\n",
    __FILE__, VZFit, group);
  theCommands.Add("vrepaint",
            "vrepaint [-immediate] [-continuous FPS]"
    "\n\t\t: force redraw of active View"
    "\n\t\t:   -immediate  flag performs redraw of immediate layers only;"
    "\n\t\t:   -continuous activates/deactivates continuous redraw of active View,"
    "\n\t\t:                0 means no continuous rendering,"
    "\n\t\t:               -1 means non-stop redraws,"
    "\n\t\t:               >0 specifies target framerate,",
    __FILE__,VRepaint,group);
  theCommands.Add("vclear",
    "vclear          : vclear"
    "\n\t\t: remove all the object from the viewer",
    __FILE__,VClear,group);
  theCommands.Add (
    "vbackground",
    "Changes background or some background settings.\n"
    "\n"
    "Usage:\n"
    "  vbackground -imageFile ImageFile [-imageMode FillType]\n"
    "  vbackground -imageMode FillType\n"
    "  vbackground -gradient Color1 Color2 [-gradientMode FillMethod]\n"
    "  vbackground -gradientMode FillMethod\n"
    "  vbackground -cubemap CubemapFile1 [CubeMapFiles2-5] [-order TilesIndexes1-6] [-invertedz]\n"
    "  vbackground -color Color\n"
    "  vbackground -default -gradient Color1 Color2 [-gradientMode FillType]\n"
    "  vbackground -default -color Color\n"
    "  vbackground -help\n"
    "\n"
    "Options:\n"
    "  -imageFile    (-imgFile, -image, -img):             sets filename of image used as background\n"
    "  -imageMode    (-imgMode, -imageMd, -imgMd):         sets image fill type\n"
    "  -gradient     (-grad, -gr):                         sets background gradient starting and ending colors\n"
    "  -gradientMode (-gradMode, -gradMd, -grMode, -grMd): sets gradient fill method\n"
    "  -cubemap      (-cmap, -cm):                         sets environment cubemap as background\n"
    "  -invertedz    (-invz, -iz):                         sets inversion of Z axis for background cubemap rendering\n"
    "  -order        (-o):                                 defines order of tiles in one image cubemap\n"
    "                                                      (has no effect in case of multi image cubemaps)\n"
    "  -color        (-col):                               sets background color\n"
    "  -default      (-def):                               sets background default gradient or color\n"
    "  -help         (-h):                                 outputs short help message\n"
    "\n"
    "Arguments:\n"
    "  Color:        Red Green Blue  - where Red, Green, Blue must be integers within the range [0, 255]\n"
    "                                  or reals within the range [0.0, 1.0]\n"
    "                ColorName       - one of WHITE, BLACK, RED, GREEN, BLUE, etc.\n"
    "                #HHH, [#]HHHHHH - where H is a hexadecimal digit (0 .. 9, a .. f, or A .. F)\n"
    "  FillMethod:   one of NONE, HOR[IZONTAL], VER[TICAL], DIAG[ONAL]1, DIAG[ONAL]2, CORNER1, CORNER2, CORNER3, "
    "CORNER4\n"
    "  FillType:     one of CENTERED, TILED, STRETCH, NONE\n"
    "  ImageFile:    a name of the file with the image used as a background\n"
    "  CubemapFilei: a name of the file with one image packed cubemap or names of separate files with every cubemap side\n"
    "  TileIndexi:   a cubemap side index in range [0, 5] for i tile of one image packed cubemap\n",
    __FILE__,
    vbackground,
    group);
  theCommands.Add ("vsetbg",
                   "Loads image as background."
                   "\n\t\t: vsetbg ImageFile [FillType]"
                   "\n\t\t: vsetbg -imageFile ImageFile [-imageMode FillType]"
                   "\n\t\t: Alias for 'vbackground -imageFile ImageFile [-imageMode FillType]'.",
                   __FILE__,
                   vbackground,
                   group);
  theCommands.Add ("vsetbgmode",
                   "Changes background image fill type."
                   "\n\t\t: vsetbgmode [-imageMode] FillType"
                   "\n\t\t: Alias for 'vbackground -imageMode FillType'.",
                   __FILE__,
                   vbackground,
                   group);
  theCommands.Add ("vsetgradientbg",
                   "Mounts gradient background."
                   "\n\t\t: vsetgradientbg Color1 Color2 [FillMethod]"
                   "\n\t\t: vsetgradientbg -gradient Color1 Color2 [-gradientMode FillMethod]"
                   "\n\t\t: Alias for 'vbackground -gradient Color1 Color2 -gradientMode FillMethod'.",
                   __FILE__,
                   vbackground,
                   group);
  theCommands.Add ("vsetgrbgmode",
                   "Changes gradient background fill method."
                   "\n\t\t: vsetgrbgmode [-gradientMode] FillMethod"
                   "\n\t\t: Alias for 'vbackground -gradientMode FillMethod'.",
                   __FILE__,
                   vbackground,
                   group);
  theCommands.Add ("vsetcolorbg",
                   "Sets background color."
                   "\n\t\t: vsetcolorbg [-color] Color."
                   "\n\t\t: Alias for 'vbackground -color Color'.",
                   __FILE__,
                   vbackground,
                   group);
  theCommands.Add ("vsetdefaultbg",
                   "Sets default viewer background fill color (flat/gradient)."
                   "\n\t\t: vsetdefaultbg Color1 Color2 [FillMethod]"
                   "\n\t\t: vsetdefaultbg -gradient Color1 Color2 [-gradientMode FillMethod]"
                   "\n\t\t: Alias for 'vbackground -default -gradient Color1 Color2 [-gradientMode FillMethod]'."
                   "\n\t\t: vsetdefaultbg [-color] Color"
                   "\n\t\t: Alias for 'vbackground -default -color Color'.",
                   __FILE__,
                   vbackground,
                   group);
  theCommands.Add("vscale",
    "vscale          : vscale X Y Z",
    __FILE__,VScale,group);
  theCommands.Add("vzbufftrihedron",
            "vzbufftrihedron [{-on|-off}=-on] [-type {wireframe|zbuffer}=zbuffer]"
    "\n\t\t:       [-position center|left_lower|left_upper|right_lower|right_upper]"
    "\n\t\t:       [-scale value=0.1] [-size value=0.8] [-arrowDiam value=0.05]"
    "\n\t\t:       [-colorArrowX color=RED] [-colorArrowY color=GREEN] [-colorArrowZ color=BLUE]"
    "\n\t\t:       [-nbfacets value=12] [-colorLabels color=WHITE]"
    "\n\t\t:       [-colorLabelX color] [-colorLabelY color] [-colorLabelZ color]"
    "\n\t\t: Displays a trihedron",
    __FILE__,VZBuffTrihedron,group);
  theCommands.Add("vrotate",
    "vrotate [[-mouseStart X Y] [-mouseMove X Y]]|[AX AY AZ [X Y Z]]"
    "\n                : Option -mouseStart starts rotation according to the mouse position"
    "\n                : Option -mouseMove continues rotation with angle computed"
    "\n                : from last and new mouse position."
    "\n                : vrotate AX AY AZ [X Y Z]",
    __FILE__,VRotate,group);
  theCommands.Add("vzoom",
    "vzoom           : vzoom coef",
    __FILE__,VZoom,group);
  theCommands.Add("vpan",
    "vpan            : vpan dx dy",
    __FILE__,VPan,group);
  theCommands.Add("vcolorscale",
    "vcolorscale name [-noupdate|-update] [-demo]"
    "\n\t\t:       [-range RangeMin=0 RangeMax=1 NbIntervals=10]"
    "\n\t\t:       [-font HeightFont=20]"
    "\n\t\t:       [-logarithmic {on|off}=off] [-reversed {on|off}=off]"
    "\n\t\t:       [-smoothTransition {on|off}=off]"
    "\n\t\t:       [-hueRange MinAngle=230 MaxAngle=0]"
    "\n\t\t:       [-colorRange MinColor=BLUE1 MaxColor=RED]"
    "\n\t\t:       [-textpos {left|right|center|none}=right]"
    "\n\t\t:       [-labelAtBorder {on|off}=on]"
    "\n\t\t:       [-colors Color1 Color2 ...] [-color Index Color]"
    "\n\t\t:       [-labels Label1 Label2 ...] [-label Index Label]"
    "\n\t\t:       [-freeLabels NbOfLabels Label1 Label2 ...]"
    "\n\t\t:       [-xy Left=0 Bottom=0]"
    "\n\t\t:       [-uniform lightness hue_from hue_to]"
    "\n\t\t:  -demo     - displays a color scale with demonstratio values"
    "\n\t\t:  -colors   - set colors for all intervals"
    "\n\t\t:  -color    - set color for specific interval"
    "\n\t\t:  -uniform  - generate colors with the same lightness"
    "\n\t\t:  -textpos  - horizontal label position relative to color scale bar"
    "\n\t\t:  -labelAtBorder - vertical label position relative to color interval;"
    "\n\t\t:              at border means the value inbetween neighbor intervals,"
    "\n\t\t:              at center means the center value within current interval"
    "\n\t\t:  -labels   - set labels for all intervals"
    "\n\t\t:  -freeLabels - same as -labels but does not require"
    "\n\t\t:              matching the number of intervals"
    "\n\t\t:  -label    - set label for specific interval"
    "\n\t\t:  -title    - set title"
    "\n\t\t:  -reversed - setup smooth color transition between intervals"
    "\n\t\t:  -smoothTransition - swap colorscale direction"
    "\n\t\t:  -hueRange - set hue angles corresponding to minimum and maximum values",
    __FILE__, VColorScale, group);
  theCommands.Add("vgraduatedtrihedron",
    "vgraduatedtrihedron : -on/-off [-xname Name] [-yname Name] [-zname Name] [-arrowlength Value]\n"
    "\t[-namefont Name] [-valuesfont Name]\n"
    "\t[-xdrawname on/off] [-ydrawname on/off] [-zdrawname on/off]\n"
    "\t[-xnameoffset IntVal] [-ynameoffset IntVal] [-znameoffset IntVal]"
    "\t[-xnamecolor Color] [-ynamecolor Color] [-znamecolor Color]\n"
    "\t[-xdrawvalues on/off] [-ydrawvalues on/off] [-zdrawvalues on/off]\n"
    "\t[-xvaluesoffset IntVal] [-yvaluesoffset IntVal] [-zvaluesoffset IntVal]"
    "\t[-xcolor Color] [-ycolor Color] [-zcolor Color]\n"
    "\t[-xdrawticks on/off] [-ydrawticks on/off] [-zdrawticks on/off]\n"
    "\t[-xticks Number] [-yticks Number] [-zticks Number]\n"
    "\t[-xticklength IntVal] [-yticklength IntVal] [-zticklength IntVal]\n"
    "\t[-drawgrid on/off] [-drawaxes on/off]\n"
    " - Displays or erases graduated trihedron"
    " - xname, yname, zname - names of axes, default: X, Y, Z\n"
    " - namefont - font of axes names. Default: Arial\n"
    " - xnameoffset, ynameoffset, znameoffset - offset of name from values or tickmarks or axis. Default: 30\n"
    " - xnamecolor, ynamecolor, znamecolor - colors of axes names\n"
    " - xvaluesoffset, yvaluesoffset, zvaluesoffset - offset of values from tickmarks or axis. Default: 10\n"
    " - valuesfont - font of axes values. Default: Arial\n"
    " - xcolor, ycolor, zcolor - color of axis and values\n"
    " - xticks, yticks, xzicks - number of tickmark on axes. Default: 5\n"
    " - xticklength, yticklength, xzicklength - length of tickmark on axes. Default: 10\n",
    __FILE__,VGraduatedTrihedron,group);
  theCommands.Add("vtile" ,
            "vtile [-totalSize W H] [-lowerLeft X Y] [-upperLeft X Y] [-tileSize W H]"
    "\n\t\t: Setup view to draw a tile (a part of virtual bigger viewport)."
    "\n\t\t:  -totalSize the size of virtual bigger viewport"
    "\n\t\t:  -tileSize  tile size (the view size will be used if omitted)"
    "\n\t\t:  -lowerLeft tile offset as lower left corner"
    "\n\t\t:  -upperLeft tile offset as upper left corner",
    __FILE__, VTile, group);
  theCommands.Add("vzlayer",
              "vzlayer [layerId]"
      "\n\t\t:         [-add|-delete|-get|-settings] [-insertBefore AnotherLayer] [-insertAfter AnotherLayer]"
      "\n\t\t:         [-origin X Y Z] [-cullDist Distance] [-cullSize Size]"
      "\n\t\t:         [-enable|-disable {depthTest|depthWrite|depthClear|depthoffset}]"
      "\n\t\t:         [-enable|-disable {positiveOffset|negativeOffset|textureenv|rayTracing}]"
      "\n\t\t: ZLayer list management:"
      "\n\t\t:   -add      add new z layer to viewer and print its id"
      "\n\t\t:   -insertBefore add new z layer and insert it before existing one"
      "\n\t\t:   -insertAfter  add new z layer and insert it after  existing one"
      "\n\t\t:   -delete   delete z layer"
      "\n\t\t:   -get      print sequence of z layers"
      "\n\t\t:   -settings print status of z layer settings"
      "\n\t\t:   -disable  disables given setting"
      "\n\t\t:   -enable   enables  given setting",
    __FILE__,VZLayer,group);
  theCommands.Add("vlayerline",
    "vlayerline : vlayerline x1 y1 x2 y2 [linewidth=0.5] [linetype=0] [transparency=1.0]",
    __FILE__,VLayerLine,group);
  theCommands.Add("vgrid",
              "vgrid [off] [-type {rect|circ}] [-mode {line|point}] [-origin X Y] [-rotAngle Angle] [-zoffset DZ]"
      "\n\t\t:       [-step X Y] [-size DX DY]"
      "\n\t\t:       [-step StepRadius NbDivisions] [-radius Radius]",
    __FILE__, VGrid, group);
  theCommands.Add ("vpriviledgedplane",
    "vpriviledgedplane [Ox Oy Oz Nx Ny Nz [Xx Xy Xz]]"
    "\n\t\t:   Ox, Oy, Oz - plane origin"
    "\n\t\t:   Nx, Ny, Nz - plane normal direction"
    "\n\t\t:   Xx, Xy, Xz - plane x-reference axis direction"
    "\n\t\t: Sets or prints viewer's priviledged plane geometry.",
    __FILE__, VPriviledgedPlane, group);
  theCommands.Add ("vconvert",
    "vconvert v [Mode={window|view}]"
    "\n\t\t: vconvert x y [Mode={window|view|grid|ray}]"
    "\n\t\t: vconvert x y z [Mode={window|grid}]"
    "\n\t\t:   window - convert to window coordinates, pixels"
    "\n\t\t:   view   - convert to view projection plane"
    "\n\t\t:   grid   - convert to model coordinates, given on grid"
    "\n\t\t:   ray    - convert projection ray to model coordinates"
    "\n\t\t: - vconvert v window : convert view to window;"
    "\n\t\t: - vconvert v view   : convert window to view;"
    "\n\t\t: - vconvert x y window : convert view to window;"
    "\n\t\t: - vconvert x y view : convert window to view;"
    "\n\t\t: - vconvert x y : convert window to model;"
    "\n\t\t: - vconvert x y grid : convert window to model using grid;"
    "\n\t\t: - vconvert x y ray : convert window projection line to model;"
    "\n\t\t: - vconvert x y z window : convert model to window;"
    "\n\t\t: - vconvert x y z grid : convert view to model using grid;"
    "\n\t\t: Converts the given coordinates to window/view/model space.",
    __FILE__, VConvert, group);
  theCommands.Add ("vfps",
    "vfps [framesNb=100] [-duration seconds] : estimate average frame rate for active view",
    __FILE__, VFps, group);
  theCommands.Add ("vstereo",
            "vstereo [0|1] [-mode Mode] [-reverse {0|1}]"
    "\n\t\t:         [-mirrorComposer] [-hmdfov2d AngleDegrees] [-unitFactor MetersFactor]"
    "\n\t\t:         [-anaglyph Filter]"
    "\n\t\t: Control stereo output mode."
    "\n\t\t: When -mirrorComposer is specified, VR rendered frame will be mirrored in window (debug)."
    "\n\t\t: Parameter -unitFactor specifies meters scale factor for mapping VR input."
    "\n\t\t: Available modes for -mode:"
    "\n\t\t:  quadBuffer        - OpenGL QuadBuffer stereo,"
    "\n\t\t:                     requires driver support."
    "\n\t\t:                     Should be called BEFORE vinit!"
    "\n\t\t:  anaglyph         - Anaglyph glasses"
    "\n\t\t:  rowInterlaced    - row-interlaced display"
    "\n\t\t:  columnInterlaced - column-interlaced display"
    "\n\t\t:  chessBoard       - chess-board output"
    "\n\t\t:  sideBySide       - horizontal pair"
    "\n\t\t:  overUnder        - vertical   pair"
    "\n\t\t:  openVR           - OpenVR (HMD)"
    "\n\t\t: Available Anaglyph filters for -anaglyph:"
    "\n\t\t:  redCyan, redCyanSimple, yellowBlue, yellowBlueSimple,"
    "\n\t\t:  greenMagentaSimple",
    __FILE__, VStereo, group);
  theCommands.Add ("vmemgpu",
    "vmemgpu [f]: print system-dependent GPU memory information if available;"
    " with f option returns free memory in bytes",
    __FILE__, VMemGpu, group);
  theCommands.Add ("vreadpixel",
    "vreadpixel xPixel yPixel [{rgb|rgba|sRGB|sRGBa|depth|hls|rgbf|rgbaf}=rgba] [-name|-hex]"
    " : Read pixel value for active view",
    __FILE__, VReadPixel, group);
  theCommands.Add("diffimage",
            "diffimage imageFile1 imageFile2 [diffImageFile]"
    "\n\t\t:           [-toleranceOfColor {0..1}=0] [-blackWhite {on|off}=off] [-borderFilter {on|off}=off]"
    "\n\t\t:           [-display viewName prsName1 prsName2 prsNameDiff] [-exitOnClose] [-closeOnEscape]"
    "\n\t\t: Compare two images by content and generate difference image."
    "\n\t\t: When -exitOnClose is specified, closing the view will exit application."
    "\n\t\t: When -closeOnEscape is specified, view will be closed on pressing Escape.",
    __FILE__, VDiffImage, group);
  theCommands.Add ("vselect",
    "vselect x1 y1 [x2 y2 [x3 y3 ... xn yn]] [-allowoverlap 0|1] [-replace|-replaceextra|-xor|-add|-remove]\n"
    "- emulates different types of selection:\n"
    "- 1) single click selection\n"
    "- 2) selection with rectangle having corners at pixel positions (x1,y1) and (x2,y2)\n"
    "- 3) selection with polygon having corners in pixel positions (x1,y1), (x2,y2),...,(xn,yn)\n"
    "- 4) -allowoverlap manages overlap and inclusion detection in rectangular and polygonal selection.\n"
    "     If the flag is set to 1, both sensitives that were included completely and overlapped partially by defined \n"
    "     rectangle or polygon will be detected, otherwise algorithm will chose only fully included sensitives.\n"
    "     Default behavior is to detect only full inclusion. (partial inclusion - overlap - is not allowed by default)\n"
    "- 5) selection scheme replace, replaceextra, xor, add or remove (replace by default)",
    __FILE__, VSelect, group);
  theCommands.Add ("vmoveto",
    "vmoveto [x y] [-reset]"
    "\n\t\t: Emulates cursor movement to pixel position (x,y)."
    "\n\t\t:   -reset resets current highlighting",
    __FILE__, VMoveTo, group);
  theCommands.Add ("vselaxis",
              "vselaxis x y z dx dy dz [-onlyTop 0|1] [-display Name] [-showNormal 0|1]"
    "\n\t\t: Provides intersection by given axis and print result intersection points"
    "\n\t\t:   -onlyTop       switches On/Off mode to find only top point or all"
    "\n\t\t:   -display Name  displays intersecting axis and result intersection points for debug goals"
    "\n\t\t:   -showNormal    adds displaying of normal in intersection point or not",
    __FILE__, VSelectByAxis, group);
  theCommands.Add ("vviewparams",
              "vviewparams [-args] [-scale [s]]"
      "\n\t\t:             [-eye [x y z]] [-at [x y z]] [-up [x y z]]"
      "\n\t\t:             [-proj [x y z]] [-center x y] [-size sx]"
      "\n\t\t: Manage current view parameters or prints all"
      "\n\t\t: current values when called without argument."
      "\n\t\t:   -scale [s]    prints or sets viewport relative scale"
      "\n\t\t:   -eye  [x y z] prints or sets eye location"
      "\n\t\t:   -at   [x y z] prints or sets center of look"
      "\n\t\t:   -up   [x y z] prints or sets direction of up vector"
      "\n\t\t:   -proj [x y z] prints or sets direction of look"
      "\n\t\t:   -center x y   sets location of center of the screen in pixels"
      "\n\t\t:   -size [sx]    prints viewport projection width and height sizes"
      "\n\t\t:                 or changes the size of its maximum dimension"
      "\n\t\t:   -args         prints vviewparams arguments for restoring current view",
    __FILE__, VViewParams, group);

  theCommands.Add("v2dmode",
    "v2dmode [-name viewName] [-mode {-on|-off}=-on]"
    "\n\t\t:   name   - name of existing view, if not defined, the active view is changed"
    "\n\t\t:   mode   - switches On/Off rotation mode"
    "\n\t\t: Set 2D mode of the active viewer manipulating. The following mouse and key actions are disabled:"
    "\n\t\t:   - rotation of the view by 3rd mouse button with Ctrl active"
    "\n\t\t:   - set view projection using key buttons: A/D/T/B/L/R for AXO, Reset, Top, Bottom, Left, Right"
    "\n\t\t: View camera position might be changed only by commands.",
    __FILE__, V2DMode, group);

  theCommands.Add("vanimation", "Alias for vanim",
    __FILE__, VAnimation, group);

  theCommands.Add("vanim",
            "List existing animations:"
    "\n\t\t:  vanim"
    "\n\t\t: Animation playback:"
    "\n\t\t:  vanim name -play|-resume [playFrom [playDuration]]"
    "\n\t\t:            [-speed Coeff] [-freeLook] [-lockLoop]"
    "\n\t\t:   -speed    playback speed (1.0 is normal speed)"
    "\n\t\t:   -freeLook skip camera animations"
    "\n\t\t:   -lockLoop disable any interactions"
    "\n\t\t:"
    "\n\t\t: Animation definition:"
    "\n\t\t:  vanim Name/sub/name [-clear] [-delete]"
    "\n\t\t:        [start TimeSec] [duration TimeSec]"
    "\n\t\t:"
    "\n\t\t: Animation name defined in path-style (anim/name or anim.name)"
    "\n\t\t: specifies nested animations."
    "\n\t\t: There is no syntax to explicitly add new animation,"
    "\n\t\t: and all non-existing animations within the name will be"
    "\n\t\t: implicitly created on first use (including parents)."
    "\n\t\t:"
    "\n\t\t: Each animation might define the SINGLE action (see below),"
    "\n\t\t: like camera transition, object transformation or custom callback."
    "\n\t\t: Child animations can be used for defining concurrent actions."
    "\n\t\t:"
    "\n\t\t: Camera animation:"
    "\n\t\t:  vanim name -view [-eye1 X Y Z] [-eye2 X Y Z]"
    "\n\t\t:                   [-at1  X Y Z] [-at2  X Y Z]"
    "\n\t\t:                   [-up1  X Y Z] [-up2  X Y Z]"
    "\n\t\t:                   [-scale1 Scale] [-scale2 Scale]"
    "\n\t\t:   -eyeX   camera Eye positions pair (start and end)"
    "\n\t\t:   -atX    camera Center positions pair"
    "\n\t\t:   -upX    camera Up directions pair"
    "\n\t\t:   -scaleX camera Scale factors pair"
    "\n\t\t: Object animation:"
    "\n\t\t:  vanim name -object [-loc1 X Y Z] [-loc2 X Y Z]"
    "\n\t\t:                     [-rot1 QX QY QZ QW] [-rot2 QX QY QZ QW]"
    "\n\t\t:                     [-scale1 Scale] [-scale2 Scale]"
    "\n\t\t:   -locX   object Location points pair (translation)"
    "\n\t\t:   -rotX   object Orientations pair (quaternions)"
    "\n\t\t:   -scaleX object Scale factors pair (quaternions)"
    "\n\t\t: Custom callback:"
    "\n\t\t:  vanim name -invoke \"Command Arg1 Arg2 %Pts %LocalPts %Normalized ArgN\""
    "\n\t\t:   %Pts        overall animation presentation timestamp"
    "\n\t\t:   %LocalPts   local animation timestamp"
    "\n\t\t:   %Normalized local animation normalized value in range 0..1"
    "\n\t\t:"
    "\n\t\t: Video recording:"
    "\n\t\t:  vanim name -record FileName [Width Height] [-fps FrameRate=24]"
    "\n\t\t:             [-format Format] [-vcodec Codec] [-pix_fmt PixelFormat]"
    "\n\t\t:             [-crf Value] [-preset Preset]"
    "\n\t\t:   -fps     video framerate"
    "\n\t\t:   -format  file format, container (matroska, etc.)"
    "\n\t\t:   -vcodec  video codec identifier (ffv1, mjpeg, etc.)"
    "\n\t\t:   -pix_fmt image pixel format (yuv420p, rgb24, etc.)"
    "\n\t\t:   -crf     constant rate factor (specific to codec)"
    "\n\t\t:   -preset  codec parameters preset (specific to codec)"
    __FILE__, VAnimation, group);

  theCommands.Add("vchangeselected",
    "vchangeselected shape"
    "- adds to shape to selection or remove one from it",
		__FILE__, VChangeSelected, group);
  theCommands.Add ("vnbselected",
    "vnbselected"
    "\n\t\t: Returns number of selected objects", __FILE__, VNbSelected, group);
  theCommands.Add ("vcamera",
              "vcamera [PrsName] [-ortho] [-projtype]"
      "\n\t\t:         [-persp]"
      "\n\t\t:         [-fovy   [Angle]] [-distance [Distance]]"
      "\n\t\t:         [-stereo] [-leftEye] [-rightEye]"
      "\n\t\t:         [-iod [Distance]] [-iodType    [absolute|relative]]"
      "\n\t\t:         [-zfocus [Value]] [-zfocusType [absolute|relative]]"
      "\n\t\t:         [-fov2d  [Angle]] [-lockZup {0|1}]"
      "\n\t\t:         [-xrPose base|head=base]"
      "\n\t\t: Manages camera parameters."
      "\n\t\t: Displays frustum when presentation name PrsName is specified."
      "\n\t\t: Prints current value when option called without argument."
      "\n\t\t: Orthographic camera:"
      "\n\t\t:   -ortho      activate orthographic projection"
      "\n\t\t: Perspective camera:"
      "\n\t\t:   -persp      activate perspective  projection (mono)"
      "\n\t\t:   -fovy       field of view in y axis, in degrees"
      "\n\t\t:   -fov2d      field of view limit for 2d on-screen elements"
      "\n\t\t:   -distance   distance of eye from camera center"
      "\n\t\t:   -lockZup    lock Z up (tunrtable mode)"
      "\n\t\t: Stereoscopic camera:"
      "\n\t\t:   -stereo     perspective  projection (stereo)"
      "\n\t\t:   -leftEye    perspective  projection (left  eye)"
      "\n\t\t:   -rightEye   perspective  projection (right eye)"
      "\n\t\t:   -iod        intraocular distance value"
      "\n\t\t:   -iodType    distance type, absolute or relative"
      "\n\t\t:   -zfocus     stereographic focus value"
      "\n\t\t:   -zfocusType focus type, absolute or relative",
    __FILE__, VCamera, group);
  theCommands.Add ("vautozfit", "command to enable or disable automatic z-range adjusting\n"
    "- vautozfit [on={1|0}] [scale]\n"
    "    Prints or changes parameters of automatic z-fit mode:\n"
    "   \"on\" - turns automatic z-fit on or off\n"
    "   \"scale\" - specifies factor to scale computed z range.\n",
    __FILE__, VAutoZFit, group);
  theCommands.Add ("vzrange", "command to manually access znear and zfar values\n"
    "   vzrange                - without parameters shows current values\n"
    "   vzrange [znear] [zfar] - applies provided values to view",
    __FILE__,VZRange, group);
  theCommands.Add("vsetviewsize",
    "vsetviewsize size",
    __FILE__,VSetViewSize,group);
  theCommands.Add("vmoveview",
    "vmoveview Dx Dy Dz [Start = 1|0]",
    __FILE__,VMoveView,group);
  theCommands.Add("vtranslateview",
    "vtranslateview Dx Dy Dz [Start = 1|0)]",
    __FILE__,VTranslateView,group);
  theCommands.Add("vturnview",
    "vturnview Ax Ay Az [Start = 1|0]",
    __FILE__,VTurnView,group);
  theCommands.Add("vtextureenv",
    "Enables or disables environment mapping in the 3D view, loading the texture from the given standard "
    "or user-defined file and optionally applying texture mapping parameters\n"
    "                  Usage:\n"
    "                  vtextureenv off - disables environment mapping\n"
    "                  vtextureenv on {std_texture|texture_file_name} [rep mod flt ss st ts tt rot] - enables environment mapping\n"
    "                              std_texture = (0..7)\n"
    "                              rep         = {clamp|repeat}\n"
    "                              mod         = {decal|modulate}\n"
    "                              flt         = {nearest|bilinear|trilinear}\n"
    "                              ss, st      - scale factors for s and t texture coordinates\n"
    "                              ts, tt      - translation for s and t texture coordinates\n"
    "                              rot         - texture rotation angle in degrees",
    __FILE__, VTextureEnv, group);
  theCommands.Add("vhlr",
            "vhlr {on|off} [-showHidden={1|0}] [-algoType={algo|polyAlgo}] [-noupdate]"
      "\n\t\t: Hidden Line Removal algorithm."
      "\n\t\t:   -showHidden if set ON, hidden lines are drawn as dotted ones"
      "\n\t\t:   -algoType   type of HLR algorithm.\n",
    __FILE__,VHLR,group);
  theCommands.Add("vhlrtype",
              "vhlrtype {algo|polyAlgo} [shape_1 ... shape_n] [-noupdate]"
      "\n\t\t: Changes the type of HLR algorithm using for shapes:"
      "\n\t\t:   'algo' - exact HLR algorithm is applied"
      "\n\t\t:   'polyAlgo' - polygonal HLR algorithm is applied"
      "\n\t\t: If shapes are not given - option is applied to all shapes in the view",
    __FILE__,VHLRType,group);
  theCommands.Add("vclipplane",
              "vclipplane planeName [{0|1}]"
      "\n\t\t:   [-equation1 A B C D]"
      "\n\t\t:   [-equation2 A B C D]"
      "\n\t\t:   [-boxInterior MinX MinY MinZ MaxX MaxY MaxZ]"
      "\n\t\t:   [-set|-unset|-setOverrideGlobal [objects|views]]"
      "\n\t\t:   [-maxPlanes]"
      "\n\t\t:   [-capping {0|1}]"
      "\n\t\t:     [-color R G B] [-transparency Value] [-hatch {on|off|ID}]"
      "\n\t\t:     [-texName Texture] [-texScale SX SY] [-texOrigin TX TY]"
      "\n\t\t:       [-texRotate Angle]"
      "\n\t\t:     [-useObjMaterial {0|1}] [-useObjTexture {0|1}]"
      "\n\t\t:       [-useObjShader {0|1}]"
      "\n\t\t: Clipping planes management:"
      "\n\t\t:   -maxPlanes   print plane limit for view"
      "\n\t\t:   -delete      delete plane with given name"
      "\n\t\t:   {off|on|0|1} turn clipping on/off"
      "\n\t\t:   -set|-unset  set/unset plane for Object or View list;"
      "\n\t\t:                applied to active View when list is omitted"
      "\n\t\t:   -equation A B C D change plane equation"
      "\n\t\t:   -clone SourcePlane NewPlane clone the plane definition."
      "\n\t\t: Capping options:"
      "\n\t\t:   -capping {off|on|0|1} turn capping on/off"
      "\n\t\t:   -color R G B          set capping color"
      "\n\t\t:   -transparency Value   set capping transparency 0..1"
      "\n\t\t:   -texName Texture      set capping texture"
      "\n\t\t:   -texScale SX SY       set capping tex scale"
      "\n\t\t:   -texOrigin TX TY      set capping tex origin"
      "\n\t\t:   -texRotate Angle      set capping tex rotation"
      "\n\t\t:   -hatch {on|off|ID}    set capping hatching mask"
      "\n\t\t:   -useObjMaterial {off|on|0|1} use material of clipped object"
      "\n\t\t:   -useObjTexture  {off|on|0|1} use texture of clipped object"
      "\n\t\t:   -useObjShader   {off|on|0|1} use shader program of object",
      __FILE__, VClipPlane, group);
  theCommands.Add("vdefaults",
               "vdefaults [-absDefl value]"
       "\n\t\t:           [-devCoeff value]"
       "\n\t\t:           [-angDefl value]"
       "\n\t\t:           [-autoTriang {off/on | 0/1}]"
    , __FILE__, VDefaults, group);
  theCommands.Add("vlight",
              "vlight [lightName] [-noupdate]"
      "\n\t\t:   [-clear|-defaults] [-layer Id] [-local|-global] [-disable|-enable]"
      "\n\t\t:   [-type {ambient|directional|spotlight|positional}] [-name value]"
      "\n\t\t:   [-position X Y Z] [-direction X Y Z] [-color colorName] [-intensity value]"
      "\n\t\t:   [-headlight 0|1] [-castShadows 0|1]"
      "\n\t\t:   [-range value] [-constAttenuation value] [-linearAttenuation value]"
      "\n\t\t:   [-spotExponent value] [-spotAngle angleDeg]"
      "\n\t\t:   [-smoothAngle value] [-smoothRadius value]"
      "\n\t\t:   [-display] [-showName 1|0] [-showRange 1|0] [-prsZoomable 1|0] [-prsSize Value]"
      "\n\t\t: Command manages light sources. Without arguments shows list of lights."
      "\n\t\t: Arguments affecting the list of defined/active lights:"
      "\n\t\t:   -clear       remove all light sources"
      "\n\t\t:   -defaults    defines two standard light sources"
      "\n\t\t:   -reset       resets light source parameters to default values"
      "\n\t\t:   -type        sets type of light source"
      "\n\t\t:   -name        sets new name to light source"
      "\n\t\t:   -global      assigns light source to all views (default state)"
      "\n\t\t:   -local       assigns light source to active view"
      "\n\t\t:   -zlayer      assigns light source to specified Z-Layer"
      "\n\t\t: Ambient light parameters:"
      "\n\t\t:   -color       sets (normalized) light color"
      "\n\t\t:   -intensity   sets intensity of light source, 1.0 by default;"
      "\n\t\t:                affects also environment cubemap intensity"
      "\n\t\t: Point light parameters:"
      "\n\t\t:   -color       sets (normalized) light color"
      "\n\t\t:   -intensity   sets PBR intensity"
      "\n\t\t:   -range       sets clamping distance"
      "\n\t\t:   -constAtten  (obsolete) sets constant attenuation factor"
      "\n\t\t:   -linearAtten (obsolete) sets linear   attenuation factor"
      "\n\t\t:   -smoothRadius sets PBR smoothing radius"
      "\n\t\t: Directional light parameters:"
      "\n\t\t:   -color       sets (normalized) light color"
      "\n\t\t:   -intensity   sets PBR intensity"
      "\n\t\t:   -direction   sets direction"
      "\n\t\t:   -headlight   sets headlight flag"
      "\n\t\t:   -castShadows enables/disables shadow casting"
      "\n\t\t:   -smoothAngle sets PBR smoothing angle (in degrees) within 0..90 range"
      "\n\t\t: Spot light parameters:"
      "\n\t\t:   -color       sets (normalized) light color"
      "\n\t\t:   -intensity   sets PBR intensity"
      "\n\t\t:   -range       sets clamping distance"
      "\n\t\t:   -position    sets position"
      "\n\t\t:   -direction   sets direction"
      "\n\t\t:   -spotAngle   sets spotlight angle"
      "\n\t\t:   -spotExp     sets spotlight exponenta"
      "\n\t\t:   -headlight   sets headlight flag"
      "\n\t\t:   -constAtten  (obsolete) sets constant attenuation factor"
      "\n\t\t:   -linearAtten (obsolete) sets linear   attenuation factor"
      "\n\t\t: Light presentation parameters:"
      "\n\t\t:   -display     adds light source presentation"
      "\n\t\t:   -showName    shows/hides the name of light source; 1 by default"
      "\n\t\t:   -showRange   shows/hides the range of spot/positional light source; 1 by default"
      "\n\t\t:   -prsZoomable makes light presentation zoomable/non-zoomable"
      "\n\t\t:   -prsSize     sets light presentation size"
      "\n\t\t: Examples:"
      "\n\t\t:   vlight redlight -type POSITIONAL -headlight 1 -pos 0 1 1 -color RED"
      "\n\t\t:   vlight redlight -delete",
    __FILE__, VLight, group);
  theCommands.Add("vpbrenv",
    "vpbrenv -clear|-generate"
    "\n\t\t: Clears or generates PBR environment map of active view."
    "\n\t\t:  -clear clears PBR environment (fills by white color)"
    "\n\t\t:  -generate generates PBR environment from current background cubemap",
    __FILE__, VPBREnvironment, group);
  theCommands.Add("vraytrace",
            "vraytrace [0|1]"
    "\n\t\t: Turns on/off ray-tracing renderer."
    "\n\t\t:   'vraytrace 0' alias for 'vrenderparams -raster'."
    "\n\t\t:   'vraytrace 1' alias for 'vrenderparams -rayTrace'.",
    __FILE__, VRenderParams, group);
  theCommands.Add("vrenderparams",
    "\n\t\t: Manages rendering parameters, affecting visual appearance, quality and performance."
    "\n\t\t: Should be applied taking into account GPU hardware capabilities and performance."
    "\n\t\t: Common parameters:"
    "\n\t\t: vrenderparams [-raster] [-shadingModel {unlit|facet|gouraud|phong|pbr|pbr_facet}=gouraud]"
    "\n\t\t:               [-msaa 0..8=0] [-rendScale scale=1]"
    "\n\t\t:               [-resolution value=72] [-fontHinting {off|normal|light}=off]"
    "\n\t\t:               [-fontAutoHinting {auto|force|disallow}=auto]"
    "\n\t\t:               [-oit {off|weight|peel}] [-oit weighted [depthFactor=0.0]] [-oit peeling [nbLayers=4]]"
    "\n\t\t:               [-shadows {on|off}=on] [-shadowMapResolution value=1024] [-shadowMapBias value=0.005]"
    "\n\t\t:               [-depthPrePass {on|off}=off] [-alphaToCoverage {on|off}=on]"
    "\n\t\t:               [-frustumCulling {on|off|noupdate}=on] [-lineFeather width=1.0]"
    "\n\t\t:               [-sync {default|views}] [-reset]"
    "\n\t\t:   -raster          Disables GPU ray-tracing."
    "\n\t\t:   -shadingModel    Controls shading model."
    "\n\t\t:   -msaa            Specifies number of samples for MSAA."
    "\n\t\t:   -rendScale       Rendering resolution scale factor (supersampling, alternative to MSAA)."
    "\n\t\t:   -resolution      Sets new pixels density (PPI) used as text scaling factor."
    "\n\t\t:   -fontHinting     Enables/disables font hinting for better readability on low-resolution screens."
    "\n\t\t:   -fontAutoHinting Manages font autohinting."
    "\n\t\t:   -lineFeather     Sets line feather factor while displaying mesh edges."
    "\n\t\t:   -alphaToCoverage Enables/disables alpha to coverage (needs MSAA)."
    "\n\t\t:   -oit             Enables/disables order-independent transparency (OIT) rendering;"
    "\n\t\t:        off         unordered transparency (but opaque objects implicitly draw first);"
    "\n\t\t:        weighted    weight OIT is managed by depth weight factor 0.0..1.0;"
    "\n\t\t:        peeling     depth peeling OIT is managed by number of peeling layers."
    "\n\t\t:   -shadows         Enables/disables shadows rendering."
    "\n\t\t:   -shadowMapResolution Shadow texture map resolution."
    "\n\t\t:   -shadowMapBias   Shadow map bias."
    "\n\t\t:   -depthPrePass    Enables/disables depth pre-pass."
    "\n\t\t:   -frustumCulling  Enables/disables objects frustum clipping or"
    "\n\t\t:                    sets state to check structures culled previously."
    "\n\t\t:   -sync            Sets active View parameters as Viewer defaults / to other Views."
    "\n\t\t:   -reset           Resets active View parameters to Viewer defaults."
    "\n\t\t: Diagnostic output (on-screen overlay):"
    "\n\t\t: vrenderparams [-perfCounters none|fps|cpu|layers|structures|groups|arrays|triangles|points"
    "\n\t\t:                             |gpuMem|frameTime|basic|extended|full|nofps|skipImmediate]"
    "\n\t\t:               [-perfUpdateInterval nbSeconds=1] [-perfChart nbFrames=1] [-perfChartMax seconds=0.1]"
    "\n\t\t:   -perfCounters       Show/hide performance counters (flags can be combined)."
    "\n\t\t:   -perfUpdateInterval Performance counters update interval."
    "\n\t\t:   -perfChart          Show frame timers chart limited by specified number of frames."
    "\n\t\t:   -perfChartMax       Maximum time in seconds with the chart."
    "\n\t\t: Ray-Tracing options:"
    "\n\t\t: vrenderparams [-rayTrace] [-rayDepth {0..10}=3] [-reflections {on|off}=off]"
    "\n\t\t:               [-fsaa {on|off}=off] [-gleam {on|off}=off] [-env {on|off}=off]"
    "\n\t\t:               [-gi {on|off}=off] [-brng {on|off}=off]"
    "\n\t\t:               [-iss {on|off}=off] [-tileSize {1..4096}=32] [-nbTiles {64..1024}=256]"
    "\n\t\t:               [-ignoreNormalMap {on|off}=off] [-twoSide {on|off}=off]"
    "\n\t\t:               [-maxRad {value>0}=30.0]"
    "\n\t\t:               [-aperture {value>=0}=0.0] [-focal {value>=0.0}=1.0]"
    "\n\t\t:               [-exposure value=0.0] [-whitePoint value=1.0] [-toneMapping {disabled|filmic}=disabled]"
    "\n\t\t:   -rayTrace     Enables  GPU ray-tracing."
    "\n\t\t:   -rayDepth     Defines maximum ray-tracing depth."
    "\n\t\t:   -reflections  Enables/disables specular reflections."
    "\n\t\t:   -fsaa         Enables/disables adaptive anti-aliasing."
    "\n\t\t:   -gleam        Enables/disables transparency shadow effects."
    "\n\t\t:   -gi           Enables/disables global illumination effects (Path-Tracing)."
    "\n\t\t:   -env          Enables/disables environment map background."
    "\n\t\t:   -ignoreNormalMap Enables/disables normal map ignoring during path tracing."
    "\n\t\t:   -twoSide      Enables/disables two-sided BSDF models (PT mode)."
    "\n\t\t:   -iss          Enables/disables adaptive screen sampling (PT mode)."
    "\n\t\t:   -maxRad       Value used for clamping radiance estimation (PT mode)."
    "\n\t\t:   -tileSize     Specifies   size of screen tiles in ISS mode (32 by default)."
    "\n\t\t:   -nbTiles      Specifies number of screen tiles per Redraw in ISS mode (256 by default)."
    "\n\t\t:   -aperture     Aperture size  of perspective camera for depth-of-field effect (0 disables DOF)."
    "\n\t\t:   -focal        Focal distance of perspective camera for depth-of-field effect."
    "\n\t\t:   -exposure     Exposure value for tone mapping (0.0 value disables the effect)."
    "\n\t\t:   -whitePoint   White point value for filmic tone mapping."
    "\n\t\t:   -toneMapping  Tone mapping mode (disabled, filmic)."
    "\n\t\t: PBR environment baking parameters (advanced/debug):"
    "\n\t\t: vrenderparams [-pbrEnvPow2size {power>0}=9] [-pbrEnvSMLN {levels>1}=6] [-pbrEnvBP {0..1}=0.99]"
    "\n\t\t:               [-pbrEnvBDSN {samples>0}=1024] [-pbrEnvBSSN {samples>0}=256]"
    "\n\t\t:   -pbrEnvPow2size Controls size of IBL maps (real size can be calculates as 2^pbrenvpow2size)."
    "\n\t\t:   -pbrEnvSMLN     Controls number of mipmap levels used in specular IBL map."
    "\n\t\t:   -pbrEnvBDSN     Controls number of samples in Monte-Carlo integration during"
    "\n\t\t:                   diffuse IBL map's sherical harmonics calculation."
    "\n\t\t:   -pbrEnvBSSN     Controls maximum number of samples per mipmap level"
    "\n\t\t:                   in Monte-Carlo integration during specular IBL maps generation."
    "\n\t\t:   -pbrEnvBP       Controls strength of samples number reducing"
    "\n\t\t:                   during specular IBL maps generation (1 disables reducing)."
    "\n\t\t: Debug options:"
    "\n\t\t: vrenderparams [-issd {on|off}=off] [-rebuildGlsl on|off]"
    "\n\t\t:   -issd         Shows screen sampling distribution in ISS mode."
    "\n\t\t:   -rebuildGlsl  Rebuild Ray-Tracing GLSL programs (for debugging)."
    "\n\t\t:   -brng         Enables/disables blocked RNG (fast coherent PT).",
    __FILE__, VRenderParams, group);
  theCommands.Add("vstatprofiler",
    "\n vstatprofiler [fps|cpu|allLayers|layers|allstructures|structures|groups"
    "\n                |allArrays|fillArrays|lineArrays|pointArrays|textArrays"
    "\n                |triangles|points|geomMem|textureMem|frameMem"
    "\n                |elapsedFrame|cpuFrameAverage|cpuPickingAverage|cpuCullingAverage|cpuDynAverage"
    "\n                |cpuFrameMax|cpuPickingMax|cpuCullingMax|cpuDynMax]"
    "\n                [-noredraw]"
    "\n\t\t: Prints rendering statistics."
    "\n\t\t:   If there are some parameters - print corresponding statistic counters values,"
    "\n\t\t:   else - print all performance counters set previously."
    "\n\t\t:   '-noredraw' Flag to avoid additional redraw call and use already collected values.\n",
    __FILE__, VStatProfiler, group);
  theCommands.Add ("vplace",
            "vplace dx dy"
    "\n\t\t: Places the point (in pixels) at the center of the window",
    __FILE__, VPlace, group);
  theCommands.Add("vxrotate",
    "vxrotate",
    __FILE__,VXRotate,group);

    theCommands.Add("vmanipulator",
      "\n    vmanipulator Name [-attach AISObject | -detach | ...]"
      "\n    tool to create and manage AIS manipulators."
      "\n    Options: "
      "\n      '-attach AISObject'                 attach manipulator to AISObject"
      "\n      '-adjustPosition {0|center|location|shapeLocation}' adjust position when attaching"
      "\n      '-adjustSize     {0|1}'             adjust size when attaching"
      "\n      '-enableModes    {0|1}'             enable modes when attaching"
      "\n      '-view  {active | [name of view]}'  display manipulator only in defined view,"
      "\n                                          by default it is displayed in all views of the current viewer"
      "\n      '-detach'                           detach manipulator"
      "\n      '-startTransform mouse_x mouse_y' - invoke start of transformation"
      "\n      '-transform      mouse_x mouse_y' - invoke transformation"
      "\n      '-stopTransform  [abort]'         - invoke stop of transformation"
      "\n      '-move x y z'                     - move attached object"
      "\n      '-rotate x y z dx dy dz angle'    - rotate attached object"
      "\n      '-scale factor'                   - scale attached object"
      "\n      '-autoActivate      {0|1}'        - set activation on detection"
      "\n      '-followTranslation {0|1}'        - set following translation transform"
      "\n      '-followRotation    {0|1}'        - set following rotation transform"
      "\n      '-followDragging    {0|1}'        - set following dragging transform"
      "\n      '-gap value'                      - set gap between sub-parts"
      "\n      '-part axis mode    {0|1}'        - set visual part"
      "\n      '-parts axis mode   {0|1}'        - set visual part"
      "\n      '-pos x y z [nx ny nz [xx xy xz]' - set position of manipulator"
      "\n      '-size value'                     - set size of manipulator"
      "\n      '-zoomable {0|1}'                 - set zoom persistence",
    __FILE__, VManipulator, group);

  theCommands.Add("vselprops",
    "\n    vselprops [dynHighlight|localDynHighlight|selHighlight|localSelHighlight] [options]"
    "\n    Customizes selection and dynamic highlight parameters for the whole interactive context:"
    "\n    -autoActivate {0|1}     : disables|enables default computation and activation of global selection mode"
    "\n    -autoHighlight {0|1}    : disables|enables automatic highlighting in 3D Viewer"
    "\n    -highlightSelected {0|1}: disables|enables highlighting of detected object in selected state"
    "\n    -pickStrategy {first|topmost} : defines picking strategy"
    "\n                            'first'   to pick first acceptable (default)"
    "\n                            'topmost' to pick only topmost (and nothing, if topmost is rejected by filters)"
    "\n    -pixTol    value        : sets up pixel tolerance"
    "\n    -depthTol {uniform|uniformpx} value : sets tolerance for sorting results by depth"
    "\n    -depthTol {sensfactor}  : use sensitive factor for sorting results by depth"
    "\n    -preferClosest {0|1}    : sets if depth should take precedence over priority while sorting results"
    "\n    -dispMode  dispMode     : sets display mode for highlighting"
    "\n    -layer     ZLayer       : sets ZLayer for highlighting"
    "\n    -color     {name|r g b} : sets highlight color"
    "\n    -transp    value        : sets transparency coefficient for highlight"
    "\n    -material  material     : sets highlight material"
    "\n    -print                  : prints current state of all mentioned parameters",
    __FILE__, VSelectionProperties, group);
  theCommands.Add ("vhighlightselected",
                   "vhighlightselected [0|1]: alias for vselprops -highlightSelected.\n",
                   __FILE__, VSelectionProperties, group);

  theCommands.Add ("vseldump",
                   "vseldump file -type {depth|unnormDepth|object|owner|selMode|entity|surfNormal}=depth -pickedIndex Index=1"
                   "\n\t\t:       [-xrPose base|head=base]"
                   "\n\t\t: Generate an image based on detection results:"
                   "\n\t\t:   depth       normalized depth values"
                   "\n\t\t:   unnormDepth unnormalized depth values"
                   "\n\t\t:   object      color of detected object"
                   "\n\t\t:   owner       color of detected owner"
                   "\n\t\t:   selMode     color of selection mode"
                   "\n\t\t:   entity      color of etected entity"
                   "\n\t\t:   surfNormal  normal direction values",
                   __FILE__, VDumpSelectionImage, group);

  theCommands.Add ("vviewcube",
                   "vviewcube name"
                   "\n\t\t: Displays interactive view manipualtion object."
                   "\n\t\t: Options: "
                   "\n\t\t:   -reset                   reset geomertical and visual attributes'"
                   "\n\t\t:   -size Size               adapted size of View Cube"
                   "\n\t\t:   -boxSize Size            box size"
                   "\n\t\t:   -axes  {0|1}             show/hide axes (trihedron)"
                   "\n\t\t:   -edges {0|1}             show/hide edges of View Cube"
                   "\n\t\t:   -vertices {0|1}          show/hide vertices of View Cube"
                   "\n\t\t:   -Yup {0|1} -Zup {0|1}    set Y-up or Z-up view orientation"
                   "\n\t\t:   -color Color             color of View Cube"
                   "\n\t\t:   -boxColor Color          box color"
                   "\n\t\t:   -boxSideColor Color      box sides color"
                   "\n\t\t:   -boxEdgeColor Color      box edges color"
                   "\n\t\t:   -boxCornerColor Color    box corner color"
                   "\n\t\t:   -textColor Color         color of side text of view cube"
                   "\n\t\t:   -innerColor Color        inner box color"
                   "\n\t\t:   -transparency Value      transparency of object within [0, 1] range"
                   "\n\t\t:   -boxTransparency Value   transparency of box    within [0, 1] range"
                   "\n\t\t:   -xAxisTextColor Color    color of X axis label"
                   "\n\t\t:   -yAxisTextColor Color    color of Y axis label"
                   "\n\t\t:   -zAxisTextColor Color    color of Z axis label"
                   "\n\t\t:   -font Name               font name"
                   "\n\t\t:   -fontHeight Value        font height"
                   "\n\t\t:   -boxFacetExtension Value box facet extension"
                   "\n\t\t:   -boxEdgeGap Value        gap between box edges and box sides"
                   "\n\t\t:   -boxEdgeMinSize Value    minimal box edge size"
                   "\n\t\t:   -boxCornerMinSize Value  minimal box corner size"
                   "\n\t\t:   -axesPadding Value       padding between box and arrows"
                   "\n\t\t:   -roundRadius Value       relative radius of corners of sides within [0.0, 0.5] range"
                   "\n\t\t:   -axesRadius Value        radius of axes of the trihedron"
                   "\n\t\t:   -axesConeRadius Value    radius of the cone (arrow) of the trihedron"
                   "\n\t\t:   -axesSphereRadius Value  radius of the sphere (central point) of trihedron"
                   "\n\t\t:   -fixedanimation {0|1}    uninterruptible animation loop"
                   "\n\t\t:   -duration Seconds        animation duration in seconds",
    __FILE__, VViewCube, group);

  theCommands.Add("vcolorconvert" ,
                  "vcolorconvert {from|to} type C1 C2 C2"
                  "\n\t\t: vcolorconvert from type C1 C2 C2: Converts color from specified color space to linear RGB"
                  "\n\t\t: vcolorconvert to type R G B: Converts linear RGB color to specified color space"
                  "\n\t\t: type can be sRGB, HLS, Lab, or Lch",
                  __FILE__,VColorConvert,group);
  theCommands.Add("vcolordiff" ,
                  "vcolordiff R1 G1 B1 R2 G2 B2: returns CIEDE2000 color difference between two RGB colors",
                  __FILE__,VColorDiff,group);
  theCommands.Add("vselbvhbuild",
                  "vselbvhbuild [{0|1}] [-nbThreads value] [-wait]"
                  "\n\t\t: Turns on/off prebuilding of BVH within background thread(s)"
                  "\n\t\t:   -nbThreads   number of threads, 1 by default; if < 1 then used (NbLogicalProcessors - 1)"
                  "\n\t\t:   -wait        waits for building all of BVH",
                  __FILE__,VSelBvhBuild,group);
}