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/SelectMgr/SelectMgr_SensitiveEntitySet.hxx

@@ -0,0 +1,78 @@
+// Created on: 2014-08-15
+// Created by: Varvara POSKONINA
+// Copyright (c) 2005-2014 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.
+
+#ifndef _SelectMgr_SensitiveEntitySet_HeaderFile
+#define _SelectMgr_SensitiveEntitySet_HeaderFile
+
+#include <BVH_PrimitiveSet.hxx>
+
+#include <NCollection_Sequence.hxx>
+#include <NCollection_Handle.hxx>
+
+#include <Select3D_BndBox3d.hxx>
+
+#include <SelectMgr_SensitiveEntity.hxx>
+#include <SelectMgr_Selection.hxx>
+
+//! This class is used to store all calculated sensitive entites of one selectable
+//! object. It provides an interface for building BVH tree which is used to speed-up
+//! the performance of searching for overlap among sensitives of one selectable object
+class SelectMgr_SensitiveEntitySet : public BVH_PrimitiveSet<Standard_Real, 3>
+{
+public:
+
+  SelectMgr_SensitiveEntitySet();
+
+  virtual ~SelectMgr_SensitiveEntitySet() {};
+
+  //! Adds new entity to the set and marks BVH tree for rebuild
+  void Append (const SelectMgr_HSensitiveEntity& theEntity);
+
+  //! Adds every entity of selection theSelection to the set and marks
+  //! BVH tree for rebuild
+  void Append (const Handle(SelectMgr_Selection)& theSelection);
+
+  //! Removes entity from the set and marks BVH tree for rebuild
+  void Remove (const SelectMgr_HSensitiveEntity& theEntity);
+
+  //! Removes every entity of selection theSelection from the set
+  //! and marks BVH tree for rebuild
+  void Remove (const Handle(SelectMgr_Selection)& theSelection);
+
+  //! Returns bounding box of entity with index theIdx
+  virtual Select3D_BndBox3d Box (const Standard_Integer theIndex) const Standard_OVERRIDE;
+
+  //! Returns geometry center of sensitive entity index theIdx
+  //! along the given axis theAxis
+  virtual Standard_Real Center (const Standard_Integer theIndex,
+                                const Standard_Integer theAxis) const Standard_OVERRIDE;
+
+  //! Swaps items with indexes theIdx1 and theIdx2
+  virtual void Swap (const Standard_Integer theIndex1,
+                     const Standard_Integer theIndex2) Standard_OVERRIDE;
+
+  //! Returns the amount of entities
+  virtual Standard_Integer Size() const Standard_OVERRIDE;
+
+  //! Returns the entity with index theIndex in the set
+  const SelectMgr_HSensitiveEntity& GetSensitiveById (const Standard_Integer theIndex) const;
+
+private:
+
+  NCollection_Sequence<SelectMgr_HSensitiveEntity> myEntities;       //!< A sequence of calculated sensitives of the object
+  NCollection_Sequence<Standard_Integer>           myEntityIdxs;     //!< Cached indexes for faster BVH build
+};
+
+#endif // _SelectMgr_SensitiveEntitySet_HeaderFile