[vtkusers] using vtkClipPolyData, It triangulate polygons.

[Sebastien_MARAUX]

Hello,

I have some polygons. I am interesting in the coutour/border 
of them only.

Everything is in a polydata (points and polygons). When I try
to clip this polydata with a volume, all my polygons are 
triangulated. 

1. How to get my polygons clipped only as polylines ?
2. should I create polylines instead, will it create some links between broken lines parts ?
3. Is there a way to get contours of my polygons back in the 
polydata ?

Sebastien MARAUX
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