[vtkusers] non-manifold edges in output of vtkDecimatePro

[Bryn Lloyd]

Hi,


I am using following code to decimate a surface mesh:

  vtkNew(vtkDecimatePro,decimate);
   decimate->SetInput(reader->GetOutput());
   decimate->SetTargetReduction(target);
   decimate->SetFeatureAngle(angle);
   decimate->PreserveTopologyOn();
   decimate->SplittingOff();
   decimate->PreSplitMeshOff();
   decimate->BoundaryVertexDeletionOff();


The output can be a broken surface mesh: There are non-manifold edges in 
the output of vtkDecimatePro. Additionally there are duplicate
triangles.

The input comes from running marching cubes on a vtkStructuredPoints. 
According to my test routines it is a good triangle mesh (i.e. NO 
non-manifold edges etc.)


Must I set a parameter of vtkDecimatePro differently, or is this a bug? 
Is there actually a guarantee that vtkDecimatePro will not break my mesh?


Thanks for any help

Bryn








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Bryn Lloyd
Computer Vision Laboratory
ETH Zürich, Sternwartstrasse 7
CH - 8092 Zürich, Switzerland
Tel: +41 44 63 26668
Fax: +41 44 63 21199
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