[vtkusers] Deep copy of vtk Object vtkModifiedBSPTree

[Normand Robert]

Hi

I wish to use vtkModifiedBSPTree with OpenMP by making copies of 
vtkModifiedBSPTree instances local to each thread but there does not 
seem to be any methods to copy this object. I naively thought that all 
vtk objects would have ShallowCopy() or DeepCopy(). I have to do this 
because using IntersectWithLine() in different threads for the same 
object instance causes crashes. Is there a solution to this?

Regards
Normand Robert PhD
Sunnybrook Research Institute
University of Toronto