[vtkusers] vtkDecimatePro Bug

[Will Schroeder]

How is the topology broken?
Also, please realize that if the original mesh has "cracks" in it, meaning 
hanging T-junction vertices, or other forms of topological disconnect, you 
may not see then in the original mesh but the decimator may amplify the 
topological situation and you will see a hole emerge.

You can use vtkFeatureEdges to find boundary/nonmanifold edges or use 
Kitware's PolyViz product on Windows 
(http://www.kitware.com/products/activiz/activizPolyViz.html) which has 
some nice capabilities to view boundary/non-manifold edges, etc.

Will

At 09:40 AM 5/7/2002 +0200, Sebastien_MARAUX wrote:
>Hi
>
>Whereas decimatePro is setup to preserve topology,
>It issues a 90% decimated polydata with modified topology,
>where do I do something wrong (first decimation is quadric
>clustering) ?
>
>  vtkDecimatePro *decimation2 = vtkDecimatePro::New();
>  decimation2->SetInput(decimation->GetOutput());
>  decimation2->PreserveTopologyOn();
>  //decimation2->SetTargetReduction(0.5);
>  decimation2->BoundaryVertexDeletionOff();
>  decimation2->SplittingOff();
>  decimation2->SetErrorIsAbsolute(1);
>  decimation2->SetAbsoluteError(0);
>  decimation2->SetMaximumError(0.0);
>  decimation2->Update();
>
>Thanks for any help
>
>Sebastien MARAUX
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