[vtkusers] vtkExtractPolyDataGeometry - PLEASE HELP ME

[Michele Zamponi]

Hello all.
I'm using vtkExtractPolyDataGeometry to extract a polydata subset.
 
The output polydata contains exactly the extracted cells, but contains
also ALL the points of the original polydata.
How can I purge unused points in the output polydata?
 
I've tried using  vtkCleanPolyData, but its output reports 0 points and
0 cells!!
 
Please help me.
Thank you in advance for any help.
 
Michele
 
 
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