Standard_Boolean SelectMgr_RectangularFrustum::Overlaps (const gp_Pnt& thePnt1,
                                                         const gp_Pnt& thePnt2,
                                                         const gp_Pnt& thePnt3,
                                                         Select3D_TypeOfSensitivity theSensType,
                                                         const SelectMgr_ViewClipRange& theClipRange,
                                                         
SelectBasics_PickResult& thePickResult) const
{

    // BUG: line 716 throw exception: "gp_Dir() - input vector has zero norm"
    // line 716
    if (myViewRayDir.IsParallel (gp_Vec (aPnts[aNearestEdgeIdx1], aPnts[aNearestEdgeIdx2]), Precision::Angular()))
    
{
      aNearestEdgeIdx2 = aNearestEdgeIdx1 == 0 ? 2 : aNearestEdgeIdx1 - 1;
    }

}

inline gp_Dir::gp_Dir (const gp_Vec& V)
{
  const gp_XYZ& XYZ = V.XYZ();
  Standard_Real X = XYZ.X();
  Standard_Real Y = XYZ.Y();
  Standard_Real Z = XYZ.Z();
  Standard_Real D = sqrt(X * X + Y * Y + Z * Z);
  Standard_ConstructionError_Raise_if (D <= gp::Resolution(), "gp_Dir() - input vector has zero 
norm");
  coord.SetX(X / D);
  coord.SetY(Y / D);
  coord.SetZ(Z / D);
}