An easier solution is to use the resample with dataset filter to map the 
unstructured grid fields to the poly data.  That won't actually clip the poly 
data by the unstructured grid volume though.  You could use the threshold or 
clip-by-scalars feature on the created vtkValidPointMask field to approximate 
the intersection, but there will be obvious errors.

-Ken


On 7/8/09 11:49 AM, "Dominik Szczerba" <[email protected]> wrote:

I would generate an implicit representation of the surface (mollified
step, distance, ...) and clip the grid with a resulting scalar field.
-- Dominik

On Wed, 2009-07-08 at 18:37 +0100, Paul Edwards wrote:
> Hi,
>
>
> I would like to cut a vtkUnstructuredGrid with vtkPolyData - does
> anyone know an easy way to do this?
>
>
> Any help/hints would be appreciated,
> Paul
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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: [email protected]
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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