[vtkusers] Is clipping really that hard in VTK???

[Bertwim van Beest]

I simply don't understand how to do the following:

I have a certain UnstructuredGrid, with one data value per cell.
Now I want to create a clipping plane, such that all data on one side of 
the plane is visible, and on the other side of the plane the grid is not 
displayed.

Seems to me a very basic problem. Yet I have not been succesful to do. I 
have looked at the examples (e.g. the clipped cow), but no success.

Who can help me out. If the answer is that the cell based values is at 
the heart of the problem, and that VTK is not the toolkit for this type 
of problems, than I would like to know, before it is too late (in that I 
have embarked on a ship that is really not equipped for these type of 
problems.

Thanks in advance,
Bertwim