[vtkusers] How to check if a vtkPolyData object is a closed surface

[Roman Grothausmann]

Dear mailing list members,


We want to check if our vtkPolyData surface is closed because the 
normals from the output of vtkPolyDataNormals with AutoOrientNormalsOn 
are not consistently pointing outwards. Strangely with 
AutoOrientNormalsOff they all normals seem to be pointing outwards.
We tried vtkSelectEnclosedPoints::IsSurfaceClosed() to check if our 
vtkPolyData surface is closed but that results in an error when we set 
CheckSurfaceOn() and Update the filter.
Is there any other way to check if a surface is closed? It would be nice 
if vtkPolyDataNormals had this functionality so that we don't need to 
create some input points for vtkSelectEnclosedPoints.
Calling vtkSelectEnclosedPoints::IsSurfaceClosed() without an instance 
seems not to be possible in python, or is it?

Any help or hints on this are very much appreciated
Roman


-- 
Roman Grothausmann

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Bereich Funktionale Materialien
Institut für angewandte Materialforschung
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