[vtkusers] strange results with vtkClipDataSet

[WolfgangZ]

Hi,

I get strange results with vtkClipDataSet. My source data is a 
unstructured mesh and I need to clip a rectangular part out of it. As 
clip function I use a vtkBox. The nice thing with vtkClipDataSet is that 
it does not triangulate inner cells (vtkBoxClipDataSet triangulates all 
cells). The problem is that the output has not a rectangular shape as 
the corners are "round". Am I doing something wrong or is this a bug?

My python script can be found here:
http://perswww.kuleuven.be/~u0049353/vtk/gridclip.py

and the sample unstructured mesh:
http://perswww.kuleuven.be/~u0049353/vtk/holz1x1d.vtu

link to the resulting image:
http://perswww.kuleuven.be/~u0049353/vtk/false.png

Regards
Wolfgang



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