[vtkusers] Get primitives of a mesh

[Ronald Römer]

Hello,

how could I analyze a mesh witch points, lines and polygons consists? I
can't find a class to do this, probably vtkCollection, but I can't
initialize a connection to my mesh. I would extract a list of points, to
create a list of point-indexed lines, and line-indexed areas.

Any idea to do this?
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