0030906: Visualization, SelectMgr_ViewerSelector - Object clipping planes overrides View clipping plane for next objects

Clipping range has been moved from SelectMgr_RectangularFrustum to SelectMgr_SelectingVolumeManager
and passed to frustum as an argument to Overlap() methods.
This fixes an issue when Clipping is customized per-object within SelectMgr_ViewerSelector::traverseObject()
in case when shallow copy of SelectMgr_SelectingVolumeManager is created
(frustums are copied from global frustum manager by Handle).

src/SelectMgr/SelectMgr_ViewClipRange.cxx

@@ -0,0 +1,104 @@
+// Copyright (c) 2019 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.
+
+#include <SelectMgr_ViewClipRange.hxx>
+
+#include <gp_Ax1.hxx>
+#include <Graphic3d_SequenceOfHClipPlane.hxx>
+
+// =======================================================================
+// function : AddClippingPlanes
+// purpose  :
+// =======================================================================
+void SelectMgr_ViewClipRange::AddClippingPlanes (const Graphic3d_SequenceOfHClipPlane& thePlanes,
+                                                 const gp_Ax1& thePickRay)
+{
+  const gp_Dir& aViewRayDir = thePickRay.Direction();
+  const gp_Pnt& aNearPnt    = thePickRay.Location();
+
+  Graphic3d_Vec4d aPlaneABCD;
+  for (Graphic3d_SequenceOfHClipPlane::Iterator aPlaneIt (thePlanes); aPlaneIt.More(); aPlaneIt.Next())
+  {
+    const Handle(Graphic3d_ClipPlane)& aClipPlane = aPlaneIt.Value();
+    if (!aClipPlane->IsOn())
+    {
+      continue;
+    }
+
+    Bnd_Range aSubRange (RealFirst(), RealLast());
+    for (const Graphic3d_ClipPlane* aSubPlaneIter = aClipPlane.get(); aSubPlaneIter != NULL; aSubPlaneIter = aSubPlaneIter->ChainNextPlane().get())
+    {
+      const gp_Pln aGeomPlane = aSubPlaneIter->ToPlane();
+      aGeomPlane.Coefficients (aPlaneABCD[0], aPlaneABCD[1], aPlaneABCD[2], aPlaneABCD[3]);
+
+      const gp_XYZ& aPlaneDirXYZ = aGeomPlane.Axis().Direction().XYZ();
+      Standard_Real aDotProduct = aViewRayDir.XYZ().Dot (aPlaneDirXYZ);
+      Standard_Real aDistance   = -aNearPnt.XYZ().Dot (aPlaneDirXYZ) - aPlaneABCD[3];
+      Standard_Real aDistToPln  = 0.0;
+
+      // check whether the pick line is parallel to clip plane
+      if (Abs (aDotProduct) < Precision::Angular())
+      {
+        if (aDistance < 0.0)
+        {
+          continue;
+        }
+        aDistToPln  = RealLast();
+        aDotProduct = 1.0;
+      }
+      else
+      {
+        // compute distance to point of pick line intersection with the plane
+        const Standard_Real aParam = aDistance / aDotProduct;
+
+        const gp_Pnt anIntersectionPnt = aNearPnt.XYZ() + aViewRayDir.XYZ() * aParam;
+        aDistToPln = anIntersectionPnt.Distance (aNearPnt);
+        if (aParam < 0.0)
+        {
+          // the plane is "behind" the ray
+          aDistToPln = -aDistToPln;
+        }
+      }
+
+      // change depth limits for case of opposite and directed planes
+      if (!aClipPlane->IsChain())
+      {
+        if (aDotProduct < 0.0)
+        {
+          ChangeUnclipRange().TrimTo (aDistToPln);
+        }
+        else
+        {
+          ChangeUnclipRange().TrimFrom (aDistToPln);
+        }
+      }
+      else
+      {
+        if (aDotProduct < 0.0)
+        {
+          aSubRange.TrimFrom (aDistToPln);
+        }
+        else
+        {
+          aSubRange.TrimTo (aDistToPln);
+        }
+      }
+    }
+
+    if (!aSubRange.IsVoid()
+      && aClipPlane->IsChain())
+    {
+      AddClipSubRange (aSubRange);
+    }
+  }
+}