0024623: Visualization - improve selection mechanism

Redesign of selection mechanism:
- implemented 3-level BVH tree for selection;
- selection now calculates in 3D space;
- intersection tests were moved to SelectMgr_BaseFrustum descendants;
- removed .cdl files in Select3D and .cdl related to selection in MeshVS;
- SelectMgr_ViewerSelectors are now shared between local and global contexts;
- transformations of sensitive entities are now stored in SelectMgr_SelectableObject only. Sensitive entities are independent from transformations, it is applied to SelectMgr_SelectingVolumeManager instance only;
- connected and multiple connected interactive objects are now represented by their child objects only for SelectMgr_SelectionManager;
- if interactive object has child objects, they will be stored as separate objects in SelectMgr_SelectionManager now.
- test cases bugs/vis/bug24623_1, bug24623_2, bug24623_3, bug24623_4 to test performance and memory issues.

src/IVtk/IVtk_IShapePickerAlgo.hxx

@@ -33,7 +33,6 @@ public:
   DEFINE_STANDARD_RTTI( IVtk_IShapePickerAlgo )
 
   virtual void SetView (const IVtk_IView::Handle& theView) = 0;
-  virtual void Modified() = 0;
   virtual int  NbPicked() = 0;
 
   //! Get activated selection modes for a shape.

src/IVtk/IVtk_IView.hxx

@@ -19,6 +19,8 @@
 #include <IVtk_Interface.hxx>
 #include <gp_XY.hxx>
 #include <gp_XYZ.hxx>
+#include <gp_Pnt.hxx>
+#include <Graphic3d_Mat4d.hxx>
 
 DEFINE_STANDARD_HANDLE( IVtk_IView, IVtk_Interface )
 
@@ -65,12 +67,26 @@ public:
   //! @return Two doubles containing the display coordinates of the view window center 
   virtual void    GetViewCenter (double& theX, double& theY) const = 0;
 
+  //! Gets window size in screen coordinates in pixels
+  virtual void    GetWindowSize (int& theX, int& theY) const = 0;
+
+  //! Gets camera projection and orientation matrices
+  virtual void    GetCamera (Graphic3d_Mat4d& theProj,
+                             Graphic3d_Mat4d& theOrient,
+                             Standard_Boolean& theIsOrtho) const = 0;
+
   //! Converts 3D display coordinates into 3D world coordinates.
   //! @param [in] theDisplayPnt 2d point of display coordinates
   //! @param [out] theWorldPnt 3d point of world coordinates
   //! @return true if conversion was successful, false otherwise
   virtual bool    DisplayToWorld (const gp_XY& theDisplayPnt, gp_XYZ& theWorldPnt) const = 0;
 
+  //! Gets viewport coordinates
+  virtual void    GetViewport (Standard_Real& theX,
+                               Standard_Real& theY,
+                               Standard_Real& theWidth,
+                               Standard_Real& theHeight) const = 0;
+
   DEFINE_STANDARD_RTTI( IVtk_IView )
 };