1 Upgrade from older OCCT versions {#occt_dev_guides__upgrade}
2 ================================
6 @section upgrade_intro Introduction
8 This document provides technical details on changes made in particular versions of OCCT, and is aimed to help upgrading user applications based on previous versions of OCCT to newer ones.
10 @subsection upgrade_intro_precautions Precautions
12 Back-up your code before upgrade.
13 We strongly recommend using version control system during upgrade process, saving one or several commits for each step of upgrade, until overall result is verified.
14 This will facilitate identification and correction of possible problems that can occur on intermediate steps of upgrade.
15 Carefully document each step to be able to repeat it if necessary.
17 @subsection upgrade_intro_disclaim Disclaimer
19 This document describes known issues that have been encountered in porting of OCCT and some applications, and approaches that helped to resolve these issues in known cases.
20 It does not pretend to cover all possible migration issues that can appear in your application.
21 Please take this document with discretion; apply your expertise and knowledge of your application to ensure correct result.
23 The automatic upgrade tool is provided as-is, without warranty of any kind, and we explicitly disclaim any liability for possible errors that may appear due to use of this tool.
24 It is your responsibility to ensure that the changes you made in your code are correct.
25 When upgrading your code by automatic script, make sure to carefully review the changes made by it, on each step, before committing them.
27 @section upgrade_700 Upgrade to OCCT 7.0.0
29 @subsection upgrade_700_persist Removal of legacy persistence
31 Legacy persistence for shapes and OCAF data based on Storage_Schema (toolkits TKShapeShcema, TLStdLSchema, TKStdSchema, TKXCAFSchema) has been removed in OCCT 7.0.0.
32 Applications that used these persistence tools for their data need to be updated to use other persistence mechanisms.
34 The existing data files in standard formats can be converted using OCCT 6.9.0 or previous version, as follows.
38 Files in CSFDB format (usually with extension .csfdb) contain OCCT shape data that can be converted to BRep format.
39 The easiest way to do that is to use ImportExport sample provided with OCCT 6.9.0 (or earlier):
41 - Start ImportExport sample
43 - Select File / Import / CSFDB... and specify the file to be converted
44 - Drag mouse with right button pressed across the view to select all shapes by rectangle
45 - Select File / Export / BREP... and specify location and name for the resulting file
47 #### OCAF and XCAF documents
49 Files containing OCAF data saved in old format usually have extensions .std or .sgd or .dxc (XDE documents).
50 These files can be converted to XML or binary OCAF formats using DRAW Test Harness commands available in OCCT 6.9.0 or earlier.
52 For that, start *DRAWEXE* and perform the following commands:
54 * for the conversion of the "*.std" and "*.sgd" file formats to the binary format "*.cbf" (Created document should be in **BinOcaf** format instead of **MDTV-Standard**):
58 Draw[]> Open [path to *.std or *.sgd file] Doc
59 Draw[]> Format Doc BinOcaf
60 Draw[]> SaveAs Doc [path to the new file]
63 * for the conversion of the "*.dxc" file format to the binary format "*.xbf" (Created document should be in **BinXCAF** format instead of **MDTV-XCAF**):
67 Draw[]> XOpen [path to *.dxc file] Doc
68 Draw[]> Format Doc BinXCAF
69 Draw[]> XSave Doc [path to the new file]
72 On Windows, be careful to replace back slashes in the file path by either direct slash or pairs of back slashes.
73 Use "XmlOcaf" or "XmlXCAF" instead of "BinOcaf" and "BinXCAF", respectively, to save in XML format instead of binary one.
75 @subsection upgrade_occt700_cdl Removal of CDL and WOK
77 OCCT code has been completely refactored in version 7.0 to get rid of obsolete technologies used since its inception: CDL (Cas.Cade Definition Language) and WOK (Workshop Organization Kit).
78 C++ code previously generated by WOK from CDL declarations is now included directly in OCCT sources.
80 This modification did not change names, API, and behavior of existing OCCT classes, thus in general the code based on OCCT 6.x should compile and work fine with OCCT 7.0.
81 However, due to redesign of basic mechanisms (CDL generic classes, Handles and RTTI) using C++ templates, some changes may be necessary in the code when porting to OCCT 7.0, as described below.
83 WOK is not necessary anymore for building OCCT from sources, though it still can be used in traditional way -- auxiliary files required for that are preserved.
84 The recommended method for building OCCT 7.x is CMake, see @ref occt_dev_guides__building_cmake.
85 Alternative solution is to use legacy generator of project files (extracted from WOK), see @ref occt_dev_guides__building_wok.
87 @subsubsection upgrade_occt700_cdl_auto Automatic upgrade
89 Most of typical changes required for upgrading code for OCCT 7.0 can be done automatically using the *upgrade* tool included in OCCT 7.0.
90 This tool is a Tcl script, thus Tcl should be available on your workstation to run it.
95 % source <path_to_occt>/adm/upgrade.tcl
96 % upgrade -recurse -all -src=<path_to_your_sources>
99 On Windows, helper batch script upgrade.bat can be used, provided that Tcl is either available in PATH, or configured via custom.bat script (for instance, if you use OCCT installed from Windows installer package). Start it from command prompt:
102 cmd> <path_to_occt>\upgrade.bat -recurse -all -inc=<path_to_occt>\inc -src=<path_to_your_sources> [options]
105 Run upgrade tool without arguments to see the list of available options.
107 Upgrade tool performs the following changes in the code.
109 1. Replaces macro DEFINE_STANDARD_RTTI by DEFINE_STANDARD_RTTIEXT, with second argument indicating base class for the main argument class (if inheritance is recognized by the script):
111 DEFINE_STANDARD_RTTI(Class) -> DEFINE_STANDARD_RTTIEXT(Class, Base)
114 @note If macro DEFINE_STANDARD_RTTI with two arguments (used in intermediate development versions of OCCT 7.0) is found, the script will convert it to either DEFINE_STANDARD_RTTIEXT or DEFINE_STANDARD_RTTI_INLINE.
115 The former case is used if current file is header and source file with the same name is found in the same folder.
116 In this case, macro IMPLEMENT_STANDARD_RTTI is injected in the corresponding source file.
117 The latter variant defines all methods for RTTI as inline, and does not require IMPLEMENT_STANDARD_RTTIEXT macro.
119 2. Replaces forward declarations of collection classes previously generated from CDL generics (defined in TCollection package) by \#include of corresponding header:
121 class TColStd_Array1OfReal; -> #include <TColStd_Array1OfReal.hxx>
124 3. Replaces underscored names of Handle classes by usage of a macro:
126 Handle_Class -> Handle(Class)
128 This change is not applied if source or header file is recognized as containing definition of Qt class with signals or slots, to avoid possible compilation errors of MOC files caused by inability of MOC to recognize macros (see http://doc.qt.io/qt-4.8/signalsandslots.html).
129 The file is considered as defining Qt object if it contains strings "Q_OBJECT" and either "slots:" or "signals".
131 4. Removes forward declarations of classes with names Handle(C) or Handle_C, replacing these either by forward declaration of its argument class, or (for files defining Qt objects) \#include statement for header with name of the argument class and extension .hxx:
133 class Handle(TColStd_HArray1OfReal); -> #include <TColStd_HArray1OfReal.hxx>
136 5. Removes \#includes of files Handle_...hxx disappeared in OCCT 7.0:
138 #include <Handle_Geom_Curve.hxx> ->
141 6. Removes typedef statements that use Handle macro to generate name:
143 typedef NCollection_Handle<Message_Msg> Handle(Message_Msg); ->
146 7. Converts C-style casts applied to Handles to calls to DownCast() method:
148 ((Handle(A)&)b) -> Handle(A)::DownCast(b)
149 (Handle(A)&)b -> Handle(A)::DownCast(b)
150 (*((Handle(A)*)&b)) -> Handle(A)::DownCast(b)
151 *((Handle(A)*)&b) -> Handle(A)::DownCast(b)
152 (*(Handle(A)*)&b) -> Handle(A)::DownCast(b)
155 8. Moves Handle() macro out of namespace scope:
157 Namespace::Handle(Class) -> Handle(Namespace::Class)
160 9. Converts local variables of reference type initialized by temporary object returned by call to DownCast(), to non-references (to avoid using reference to destroyed memory):
162 const Handle(A)& a = Handle(B)::DownCast (b); -> Handle(A) a (Handle(B)::DownCast (b));
165 10. Adds \#include for all classes used as argument to macro STANDARD_TYPE(), except of already included ones;
167 11. Removes uses of obsolete macros IMPLEMENT_DOWNCAST and IMPLEMENT_STANDARD_*, except IMPLEMENT_STANDARD_RTTIEXT.
169 @note If you plan to keep compatibility of your code with older versions of OCCT, add option "-compat" to avoid the latter change. See also @ref upgrade_occt700_cdl_compat.
173 As long as the upgrade routine runs, some information messages are sent to the standard output.
174 In some cases the warnings or errors like the following may appear:
177 Error in {HEADER_FILE}: Macro DEFINE_STANDARD_RTTI used for class {CLASS_NAME} whose declaration is not found in this file, cannot fix
180 Be sure to check carefully all reported errors and warnings, as corresponding places likely will require manual corrections.
181 In some cases these messages may help you to detect errors in your code, for instance, cases where DEFINE_STANDARD_RTTI macro is used with incorrect class name as an argument.
183 @subsubsection upgrade_occt700_cdl_compiler Possible compiler errors
185 Some situations requiring upgrade cannot be detected and / or handled by automatic procedure.
186 If you get compiler errors or warnings when trying to build upgraded code, you will need to fix them manually.
187 The following paragraphs list known situations of this kind.
189 #### Missing header files
191 Use of handle objects (construction, comparison using operators == or !=, use of function STANDRAD_TYPE() and method DownCast()) now requires the type of the object pointed by Handle to be completely known at compile time. Thus it may be necessary to include header of the corresponding class to make the code compilable.
193 For example, the following lines will fail to compile if Geom_Line.hxx is not included:
196 Handle(Geom_Line) aLine = 0;
197 if (aLine != aCurve) {...}
198 if (aCurve->IsKind(STANDARD_TYPE(Geom_Line)) {...}
199 aLine = Handle(Geom_Line)::DownCast (aCurve);
202 Note that it is not necessary to include header of the class to declare Handle to it.
203 However, if you define a class *B* that uses Handle(*A*) in its fields, or contains a method returning Handle(*A*), it is advisable to have header defining *A* included in the header of *B*.
204 This will eliminate the need to include the header *A* in each source file where class *B* is used.
206 #### Ambiguity of calls to overloaded functions
208 This issue appears in compilers that do not support default arguments in template functions (known cases are Visual C++ 10 and 11): compiler reports ambiguity error if handle is used in argument of call to function that has two or move overloaded versions, accepting handles to different types.
209 The problem is that operator const handle<T2>& is defined for any type T2, thus compiler cannot make a right choice.
213 void func (const Handle(Geom_Curve)&);
214 void func (const Handle(Geom_Surface)&);
216 Handle(Geom_TrimmedCurve) aCurve = new Geom_TrimmedCurve (...);
217 func (aCurve); // ambiguity error in VC++ 10
220 To resolve this ambiguity, change your code so that argument type corresponds exactly to the function signature.
221 In some cases this can be done by using relevant type for the corresponding variable, like in the example above:
224 Handle(Geom_Curve) aCurve = new Geom_TrimmedCurve (...);
227 Other variants are assigning the argument to local variable of correct type, using direct cast or constructor:
230 const Handle(Geom_Curve)& aGCurve (aTrimmedCurve);
231 func (aGCurve); // OK - argument has exact type
232 func (static_cast(aCurve)); // OK - direct cast
233 func (Handle(Geom_Curve)(aCurve)); // OK - temporary handle is constructed
236 Another possibility is defining additional templated variant of the overloaded function causing ambiguity, and use SFINAE to resolve the ambiguity.
237 For example of this technique, see definition of the template variant of the method IGESData_IGESWriter::Send().
239 #### Lack of implicit cast to base type
241 Due to the fact that now cast of handle to reference to handle to the base type is user-defined operation, conversions that require this cast combined with other user-defined cast will not be resolved automatically by compiler.
246 Handle(Geom_Geometry) aC = GC_MakeLine (p, v); // compiler error
249 The problem here is that class GCE2d_MakeSegment has user-defined conversion to const Handle(Geom_TrimmedCurve)&, which is not the same as type of the local variable aC.
251 To resolve this, use method Value():
254 Handle(Geom_Geometry) aC = GC_MakeLine (p, v).Value(); // ok
257 or use variable of appropriate type:
260 Handle(Geom_TrimmedCurve) aC = GC_MakeLine (p, v); // ok
263 #### Incorrect use of STANDARD_TYPE and Handle macros
265 You might need to clean your code from incorrect use of macros *STANDARD_TYPE*() and *Handle*().
267 1. Explicit definitions of static functions with names generated by macro STANDARD_TYPE(), which are artifacts of old implementation of RTTI, should be removed.
271 const Handle(Standard_Type)& STANDARD_TYPE(math_GlobOptMin)
273 static Handle(Standard_Type) _atype = new Standard_Type ("math_GlobOptMin", sizeof (math_GlobOptMin));
278 2. Incorrect location of closing parenthesis of Handle() macro that was not detectable in OCCT 6.x will cause compiler error and must be corrected.
280 Example (note misplaced closing parenthesis):
282 aBSpline = Handle( Geom2d_BSplineCurve::DownCast(BS->Copy()) );
285 #### Use of class Standard_AncestorIterator
287 Class Standard_AncestorIterator has been removed; use method Parent() of Standard_Type class to parse inheritance chain.
289 #### Absence of cast to Standard_Transient*
291 Handles in OCCT 7.0 do not have operator of conversion to Standard_Transient*, which was present in earlier versions.
292 This is done to prevent possible unintended errors like this:
295 Handle(Geom_Line) aLine = ...;
296 Handle(Geom_Surface) aSurf = ...;
298 if (aLine == aSurf) {...} // will cause compiler error in OCCT 7.0, but not OCCT 6.x
301 Places where this implicit cast has been used should be corrected manually.
302 The typical situation is when Handle is passed to stream:
305 Handle(Geom_Line) aLine = ...;
306 os << aLine; // in OCCT 6.9.0, resolves to operator << (void*)
309 Call method get() explicitly to output address of the Handle.
311 @subsubsection upgrade_occt700_cdl_runtime Possible runtime problems
313 Known situations when problems are possible at run time after upgrade to OCCT 7.0 are listed here.
315 #### References to temporary objects
317 In previous versions, compiler was able to detect situation when local variable of reference type to Handle is initialized by temporary object, and ensured that lifetime of that object is longer than that of the variable.
318 Since OCCT 7.0, it will not work if types of the temporary object and variable are different (due to involvement of user-defined type cast), thus such temporary object will be destroyed immediately.
323 // note that DownCast() returns new temporary object!
324 const Handle(Geom_BoundedCurve)& aBC =
325 Handle(Geom_TrimmedCurve)::DownCast(aCurve);
326 aBC->Transform (T); // access violation in OCCT 7.0
329 @subsubsection upgrade_occt700_cdl_compat Preserving compatibility with OCCT 6.x
331 If you like to preserve compatibility of your application code with OCCT versions 6.x even after upgrade to 7.0, consider the following suggestions:
333 1. If your code used sequences of macros IMPLEMENT_STANDARD_... generated by WOK, replace them by single macro IMPLEMENT_STANDARD_RTTIEXT
335 2. When running automatic upgrade tool, add option *-compat*.
337 3. Define macros DEFINE_STANDARD_RTTIEXT and DEFINE_STANDARD_RTTI_INLINE when building with previous versions of OCCT, resolving to DEFINE_STANDARD_RTTI with single argument
341 #if OCC_VERSION_HEX < 0x070000
342 #define DEFINE_STANDARD_RTTIEXT(C1,C2) DEFINE_STANDARD_RTTI(C1)
343 #define DEFINE_STANDARD_RTTI_INLINE(C1,C2) DEFINE_STANDARD_RTTI(C1)
347 @subsubsection upgrade_occt700_cdl_wok Applications based on CDL and WOK
349 If you have application essentially based on CDL, and need to upgrade it to OCCT 7.0, you will very likely need to convert your application code to non-CDL form.
350 This is non-trivial effort; the required actions would depend strongly on the structure of the code and used features of CDL.
352 The upgrade script and sources of specialized version of WOK used for upgrading OCCT code can be found in WOK Git repository in branch [CR0_700_2](http://git.dev.opencascade.org/gitweb/?p=occt-wok.git;a=log;h=refs/heads/CR0_700_2).
354 [Contact us](http://www.opencascade.com/contact/) if you need more help.
356 @subsection upgrade_occt700_bspline Separation of BSpline cache
358 Implementation of NURBS curves and surfaces has been revised: cache of polynomial coefficients, used to accelerate calculate values of B-spline, is separated from data objects (Geom2d_BSplineCurve, Geom_BSplineCurve, Geom_BSplineSurface), into dedicated classes (BSplCLib_Cache and BSplSLib_Cache).
360 The benefits of this change are:
362 * Reduced memory footprint of OCCT shapes (up to 20% on some cases)
363 * Possibility to evaluate the same B-Spline concurrently in parallel threads without data races and mutex locks
365 The drawback is that direct evaluation of B-Splines using methods of curves and surfaces becomes slower, due to absence of cache. The way to avoid slow down is to use adaptor classes (Geom2dAdaptor_Curve, GeomAdaptor_Curve and GeomAdaptor_Surface): they now use cache when the curve or surface is a B-spline.
367 OCCT algorithms are changed to use adaptors for B-spline calculations instead of direct methods of curves and surfaces.
368 The same changes (use of adaptors instead of direct call to curve and surface methods) should be implemented in relevant places in applications based on OCCT in order to get maximum performance.
370 @subsection upgrade_occt700_sorttools Removal of SortTools package
372 Package SortTools has been removed.
373 The code that used the tools provided by that package should be corrected manually.
374 The recommended approach is to use sorting algorithms provided by STL.
378 #include <SortTools_StraightInsertionSortOfReal.hxx>
379 #include <SortTools_ShellSortOfReal.hxx>
380 #include <TCollection_CompareOfReal.hxx>
382 TCollection_Array1OfReal aValues = ...;
384 TCollection_CompareOfReal aCompReal;
385 SortTools_StraightInsertionSortOfReal::Sort(aValues, aCompReal);
391 TCollection_Array1OfReal aValues = ...;
393 std::stable_sort (aValues->begin(), aValues->end());
396 @subsection upgrade_occt700_2dlayers On-screen objects and ColorScale
398 Old mechanism for rendering Underlay and Overlay on-screen 2D objects based on Visual3d_Layer and immediate drawing model (e.g. uncached and thus slow) have been removed.
399 Classes Aspect_Clayer2d, OpenGl_GraphicDriver_Layer, Visual3d_Layer, Visual3d_LayerItem, V3d_LayerMgr, V3d_LayerMgrPointer have been deleted.
401 General AIS interactive objects with transformation persistence flag Graphic3d_TMF_2d can be used as replacement of Visual3d_LayerItem.
402 Anchor point specified for transformation persistence defines a corner of window (or center in case of (0, 0) point).
403 To keep on-screen 2D objects on the top of main screen, them could be assigned to appropriate Z-layer.
404 Predefined Z-layers Graphic3d_ZLayerId_TopOSD and Graphic3d_ZLayerId_BotOSD are intended to replace Underlay and Overlay layers within old API.
406 ColorScale object previously implemented using Visual3d_LayerItem has been moved to a new class AIS_ColorScale, with width and height specified explicitly.
407 The property of V3d_View storing global ColorScale object has been removed with associated methods V3d_View::ColorScaleDisplay(), V3d_View::ColorScaleErase(), V3d_View::ColorScaleIsDisplayed(), V3d_View::ColorScale() and classes V3d_ColorScale, V3d_ColorScaleLayerItem, Aspect_ColorScale.
408 Here is an example of creating ColorScale using updated API:
411 Handle(AIS_ColorScale) aCS = new AIS_ColorScale();
413 Standard_Integer aWidth, aHeight;
414 aView->Window()->Size (aWidth, aHeight);
415 aCS->SetSize (aWidth, aHeight);
416 aCS->SetRange (0.0, 10.0);
417 aCS->SetNumberOfIntervals (10);
419 aCS->SetZLayer (Graphic3d_ZLayerId_TopOSD);
420 aCS->SetTransformPersistence (Graphic3d_TMF_2d, gp_Pnt (-1,-1,0));
422 theContextAIS->Display (aCS);
425 To see how 2d objects are realized in OCCT you can call draw commands vcolorscale, vlayerline or vdrawtext (with -2d option).
426 Draw command vcolorscale now requires a name of ColorScale object as an argument.
427 To display this object use command vdisplay. Example:
432 vcolorscale cs –demo
438 vlayerline 0 300 300 300 10
439 vdrawtext t "2D-TEXT" -2d -pos 0 150 0 -color red
442 Here is a small example in c++ how to display a custom AIS object in 2d:
444 Handle(AIS_InteractiveContext) aContext = ...;
445 Handle(AIS_InteractiveObject) anObj =...; // create an AIS object
446 anObj->SetZLayer(Graphic3d_ZLayerId_TopOSD); // display object in overlay
447 anObj->SetTransformPersistence (Graphic3d_TMF_2d, gp_Pnt (-1,-1,0)); // set 2d flag, coordinate origin is set to down-left corner
448 aContext->Display (anObj); // display the object
451 @subsection upgrade_occt700_userdraw UserDraw and Visual3d
453 #### Visual3d package
455 Package Visual3d implementing intermediate layer between high-level V3d classes
456 and low-level OpenGl classes for views and graphic structures management has been dropped.
458 The OpenGl_View inherits from the new class Graphic3d_CView.
459 Graphic3d_CView is an interface class that declares abstract methods for managing displayed structures,
460 display properties and a base layer code that implements computation
461 and management of HLR (or more broadly speaking view-depended) structures.
463 In new implementation it takes place of eliminated Visual3d_View.
464 As before the instance of Graphic3d_CView is still completely managed by V3d_View classes.
465 It can be accessed through V3d_View interface but normally this should not be required as all its methods are completely wrapped.
467 In more details, a concrete specialization of Graphic3d_CView is created and returned by graphical driver on request.
468 Right after creation the views is directly used for setting rendering properties and adding graphical structures to be displayed.
470 The rendering of graphics is possible after mapping a window and activating the view.
471 The direct setting of properties makes obsolete usage of intermediate structures with display parameter
472 like Visual3d_ContextView and etc (the whole package of Visual3d become redundant).
474 New location of functionality previously provided by Visual3d package:
475 - Logic of managing display of structures was put from Visual3d_ViewManager into Graphic3d_StructureManager.
476 - Removed Visual3d_View class. Logic of managing computed structures was put into base layer of Graphi3d_CView.
477 - Removed all intermediate structures for storing view parameters e.g. Visual3d_ContextView.
478 All settings are kept by instances of Graphic3d_CView
479 - Removed Visual3d_Light intermediate class.
480 All light properties are still stored in Graphic3d_CLight structure.
481 The structure is directly access by instance of V3d_Light classes.
482 - Moved all needed enumerations into Graphic3d package.
484 #### Custom OpenGL rendering and UserDraw
486 Old APIs based on global callback functions for creating UserDraw objects and for performing custom OpenGL rendering within the view have been dropped.
487 UserDraw callbacks no more required since OpenGl_Group now inherits Graphic3d_Group and thus can be accessed directly from AIS_InteractiveObject:
490 //! Class implementing custom OpenGL element.
491 class UserDrawElement : public OpenGl_Element {};
493 //! Implementation of virtual method AIS_InteractiveObject::Compute().
494 void UserDrawObject::Compute (const Handle(PrsMgr_PresentationManager3d)& thePrsMgr,
495 const Handle(Prs3d_Presentation)& thePrs,
496 const Standard_Integer theMode)
498 Graphic3d_Vec4 aBndMin (myCoords[0], myCoords[1], myCoords[2], 1.0f);
499 Graphic3d_Vec4 aBndMax (myCoords[3], myCoords[4], myCoords[5], 1.0f);
501 // casting to OpenGl_Group should be always true as far as application uses OpenGl_GraphicDriver for rendering
502 Handle(OpenGl_Group) aGroup = Handle(OpenGl_Group)::DownCast (thePrs->NewGroup());
503 aGroup->SetMinMaxValues (aBndMin.x(), aBndMin.y(), aBndMin.z(),
504 aBndMax.x(), aBndMax.y(), aBndMax.z());
505 UserDrawElement* anElem = new UserDrawElement (this);
506 aGroup->AddElement(anElem);
508 // invalidate bounding box of the scene
509 thePrsMgr->StructureManager()->Update (thePrsMgr->StructureManager()->UpdateMode());
513 For performing custom OpenGL code within view, user should inherit from class OpenGl_View.
514 See the following code sample:
518 class UserView : public OpenGl_View
521 //! Override rendering into the view.
522 virtual void render (Graphic3d_Camera::Projection theProjection,
523 OpenGl_FrameBuffer* theReadDrawFbo,
524 const Standard_Boolean theToDrawImmediate)
526 OpenGl_View::render (theProjection, theReadDrawFbo, theToDrawImmediate);
527 if (theToDrawImmediate)
532 // perform custom drawing
533 const Handle(OpenGl_Context)& aCtx = myWorkspace->GetGlContext();
534 GLfloat aVerts[3] = { 0.0f, 0,0f, 0,0f };
535 aCtx->core20->glEnableClientState(GL_VERTEX_ARRAY);
536 aCtx->core20->glVertexPointer(3, GL_FLOAT, 0, aVerts);
537 aCtx->core20->glDrawArrays(GL_POINTS, 0, 1);
538 aCtx->core20->glDisableClientState(GL_VERTEX_ARRAY);
543 //! Custom driver for creating UserView.
544 class UserDriver : public OpenGl_GraphicDriver
547 //! Create instance of own view.
548 virtual Handle(Graphic3d_CView) CreateView (const Handle(Graphic3d_StructureManager)& theMgr) Standard_OVERRIDE
550 Handle(UserView) aView = new UserView (theMgr, this, myCaps, myDeviceLostFlag, &myStateCounter);
551 myMapOfView.Add (aView);
552 for (TColStd_SequenceOfInteger::Iterator aLayerIt (myLayerSeq); aLayerIt.More(); aLayerIt.Next())
554 const Graphic3d_ZLayerId aLayerID = aLayerIt.Value();
555 const Graphic3d_ZLayerSettings& aSettings = myMapOfZLayerSettings.Find (aLayerID);
556 aView->AddZLayer (aLayerID);
557 aView->SetZLayerSettings (aLayerID, aSettings);
565 @subsection upgrade_occt700_localcontext Deprecation of Local Context
567 Conception of Local Context has been deprecated.
568 Related classes (AIS_LocalContext) and methods (AIS_InteractiveContext::OpenLocalContext() and others) will be removed within some future OCCT release.
570 The main functionality provided by Local Context - selection of object subparts - can be now used within Neutral Point without opening any Local Context.
572 @subsection upgrade_occt700_separate_caf_visualisation Separation of visualization part from TKCAF
574 Visualization CAF attributes moved into new toolkit TKVCAF.
575 If your application uses the classes from TPrsStd package then add link to TKVCAF library.
577 Verson numbers of BinOCAF and XmlOCAF formats are incremented; new files cannot be read by previous versions of OCCT.
579 For loading OCAF files saved by previous versions and containing attribute TPrsStd_AISPresentation it is necessary that environment variable CSF_MIGRATION_TYPES should be defined, pointing to file src/StdResources/MigrationSheet.txt.
580 When using documents loaded from a file, make sure to call method TPrsStd_AISViewer::New() prior to accessing TPrsStd_AISPresentation attributes in this document (that method will create them).