[vtkusers] vtkExtractSelection -- how to get output as polydata

[Saeed Mahdizadeh Bakhshmand]

Hello,

Any idea on how to get output of vtkExtractSelection as polydata? I input
polydata but output is an UnstructuredGrid which is not suitable for next
step and converting to vtkpolydata seems to be a pain.

Thanks,
Saeed
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