[vtkusers] PolyData to UnstructuredGrid

[Luca Cinquepalmi]

Hi everybody,
I have a PolydataFile obtained with the command ParticleReader.exe which 
reads an ASCII file having the following format: X Y Z C and create a 
PolyData file. When i load the obtained PolyData file in Paraview I am 
able to apply "Clip" and "Slice" filter but not the "Contour" one. I 
think this last one can be applied only with UnstructuredGrid file. How 
can i convert PolyData file In Unstructured one? Then, if I want to 
interpolate values showed in PolydataFile, shall I use only the Delaunay 
3d filter? I would like to use IDW or Kriging interpolator...
Thank you very much

Luca