0030698: Volume Rendering - Early clipping of volume object's bounding box

Flag to control check of bounding box clipping before drawing has been added.

diff --git a/src/Graphic3d/Graphic3d_CStructure.cxx b/src/Graphic3d/Graphic3d_CStructure.cxx
index 7168413..2cd2928 100644 (file)
--- a/src/Graphic3d/Graphic3d_CStructure.cxx
+++ b/src/Graphic3d/Graphic3d_CStructure.cxx
@@ -39,7 +39,8 @@ Graphic3d_CStructure::Graphic3d_CStructure (const Handle(Graphic3d_StructureMana
   IsMutable        (Standard_False),
   Is2dText         (Standard_False),
   myGraphicDriver  (theManager->GraphicDriver()),
-  myIsCulled       (Standard_True)
+  myIsCulled       (Standard_True),
+  myBndBoxClipCheck(Standard_True)
 {
   Id = myGraphicDriver->NewIdentification();
 }

diff --git a/src/Graphic3d/Graphic3d_CStructure.hxx b/src/Graphic3d/Graphic3d_CStructure.hxx
index adfcbbe..d7c9f7c 100644 (file)
--- a/src/Graphic3d/Graphic3d_CStructure.hxx
+++ b/src/Graphic3d/Graphic3d_CStructure.hxx
@@ -145,6 +145,12 @@ public:
   //! The method is called during traverse of BVH tree.
   void MarkAsNotCulled() const { myIsCulled = Standard_False; }
 
+  //! Returns whether check of object's bounding box clipping is enabled before drawing of object; TRUE by default.
+  Standard_Boolean BndBoxClipCheck() const { return myBndBoxClipCheck; }
+
+  //! Enable/disable check of object's bounding box clipping before drawing of object.
+  void SetBndBoxClipCheck(Standard_Boolean theBndBoxClipCheck) { myBndBoxClipCheck = theBndBoxClipCheck; }
+
   //! Checks if the structure should be included into BVH tree or not.
   Standard_Boolean IsAlwaysRendered() const
   {
@@ -224,6 +230,7 @@ protected:
   Handle(Graphic3d_PresentationAttributes) myHighlightStyle; //! Current highlight style; is set only if highlight flag is true
 
   mutable Standard_Boolean myIsCulled; //!< A status specifying is structure needs to be rendered after BVH tree traverse
+  Standard_Boolean myBndBoxClipCheck;  //!< Flag responsible for checking of bounding box clipping before drawing of object
 
 public:
 

diff --git a/src/OpenGl/OpenGl_Structure.cxx b/src/OpenGl/OpenGl_Structure.cxx
index e3188fe..927a4a0 100644 (file)
--- a/src/OpenGl/OpenGl_Structure.cxx
+++ b/src/OpenGl/OpenGl_Structure.cxx
@@ -527,16 +527,16 @@ void OpenGl_Structure::Render (const Handle(OpenGl_Workspace) &theWorkspace) con
         }
 
         const Graphic3d_ClipState aBoxState = aPlane->ProbeBox (aBBox);
-        if (aBoxState == Graphic3d_ClipState_Out)
-        {
-          isClipped = true;
-          break;
-        }
-        else if (aBoxState == Graphic3d_ClipState_In)
+        if (aBoxState == Graphic3d_ClipState_In)
         {
           aCtx->ChangeClipping().SetEnabled (aPlaneIt, false);
           hasDisabled = true;
         }
+        else if (aBoxState == Graphic3d_ClipState_Out && myBndBoxClipCheck)
+        {
+          isClipped = true;
+          break;
+        }
       }
     }