[vtkusers] clip one vtkPolyData with another?

[Alle Meije Wink]

Hi Obada,

Thanks for you suggestions. I had already read Steve's email, and based 
on that info I started with a 2d contour:

1. make the cut planes with vtkCutter in the usual way
    (this generates the cut planes, but they extend to the bounding box)
2. make a 2d contour in the cut planes
    (this would generate a contour in exactly the same plane
     so -hopefully?- avoiding the roundoff errors etc)
3. clip the 2D cut surface with the 2D contour

Same result...

I tried using implicit functions from the iso-surface, the original 
data, all sorts of contours, etc. but to no avail.

I do not really understand your suggestion at the end. Does that do the 
same thing as I tried with my 2D contour?

Thanks
Alle Meije