[vtkusers] extract only BoundaryCells

[Johannes Holzmeister]

hello!

 I clipped  a surface with a plane and I only want to get the polygons which are within the clipping-plane (=BoundaryCells).
With the "vtkExtractPolyDataGeometry" I get the the "BoundaryCells" plus the surface above or below the "BoundaryCells"!

 thanx for your help!



code:
vtkExtractPolyDataGeometry* extract = vtkExtractPolyDataGeometry::New();

extract->SetInput(objectContainer4);

extract->SetImplicitFunction(plane);

extract->ExtractInsideOff();

extract->ExtractBoundaryCellsOn();

extract->Update();
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