[vtkusers] how to use vtkClipPoly or vtkClipVolume

[Sebastien_MARAUX]

I would like to obtain a 3D polygon resulting
of the 'and' operation between a 3D terrain model
and a 2D polygon (ortho)projected on it. 

i.e. I would like to specify that what is inside my 
(x,z defined because of vrml export) polygon
should clip a xyz volume.

Is it possible to use vtkClipVolume or vtk ClipPoly
to do it ?

Thanks 

Sebastien MARAUX
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