[vtkusers] vtk bug, when clipping

[Bryn Lloyd]

Hi VTK users and developers,



I think I found the bug in vtkTetra related to clipping. After clipping 
a 3D mesh I get degenerate wedges.
I did following operations (first in paraview, then with my own code, 
using VTK-5.0).


1.
I load an image (signed distance function in a vti file)

2.
tetrehedralized it using the vtkDataSetTriangleFilter

3.
clipped using scalar (vtkClipDataSet)

4.
found that the mesh contains tets and wedges (VTK_CELL_TYPE=13)

5.
I removed the wedges, there where no degenerate tets.

6.
I checked the wedges:  some of the wedges are degenerated, i.e. contain 
at least one point id twice (2762 out of 56123).


Apparently this fixed over two years ago, but it seems there is still a bug.
http://public.kitware.com/cgi-bin/viewcvs.cgi/Filtering/vtkTetra.cxx?rev=1.7&view=log

Can anybody please help to fix this? I would really appreciate some help.


Thanks a lot

Bryn