[vtkusers] How to compute intersection between surface polydata in vtk?

[Jean-Dominique Barnichon]

Dear all,

I need to find the intersection between two surfaces, each one being 
defined as a polydata (actually one surface is a vertical polyplane, and 
the other one is a topographical surface).

Such intersection operation is already effective in other libraries such 
as CGAL (http://www.cgal.org) and GTS (http://gts.sourceforge.net).
However, it is still not clear to me which approach i should follow to 
perform such an operation with vtk.
 From what i understood, one can either :
- use vtkOBBTree::IntersectWithOBBTree(...), but in this case the 
related parameters (especially the int(*function)) are not obvious to 
me. Would it be possible to have a bit more information on this method 
and its usage?
- treat polydata as an implicit surface using the vtkImplicitPolydata 
class (proposed by Dave Pont), which then allows to use vtkClipPolyData 
class (though this class is not part of vtk, yet?).

Recently, there has been quite few threads related to very similar 
topics, but i did not get whether involved people have eventually 
succeeded or not in computing the intersection using one of the above 
mentioned method.

Any help/advice is welcomed.
Thanks in advance
Jean-Do