Extracting portions of meshes

[Bernhard Hombitzer]

Hi,

does anybody know how to extract portions of meshes.
I have seen, that vtkExtractUnstructedGrid is doing so, but my problem is,
that I do not have a range(min/max) of points, I have a array/list of points.

would be pleased, if someone have an idea for me

best regards
  Berni
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