[vtkusers] find and remove congruent/coincident triangles/faces of two meshes

[Roman Grothausmann]

Dear mailing list members,


Since there weren't any answers yet, I wonder if the subject of my post 
was not clear:
I'm trying to create open surface meshes of a labelled image.
The labels are created by a watershed transformation that does not 
introduce borders. Therefore, the triangles created by 
vtkDiscreteMarchingCubes for two adjacent labels should be 
congruent/coincident in the regions where the watershed transform 
separated the particles.
I'm now looking for a filter that finds and removes congruent 
triangles/faces of two meshes. Can this be achieved with available VTK 
filters?
Or would it be possible to extend vtkDiscreteMarchingCubes to create a 
mesh only for the surface of a label adjacent to the background?

Any help or hints on this are very much appreciated
Roman


Am 30.05.2011 15:02, schrieb Roman Grothausmann:
> Dear mailing list members,
>
>
> How can I remove the surfaces created/introduced by a watershed transform?
> Would these steps work? :
> 1. Run watershed separation that does not introduce a border on a binary
> image of some blobs
> 2. mesh the resulting label image with vtkDiscreteMarchingCubes
> 3. find and remove congruent triangles
>
> Is my assumption correct that vtkDiscreteMarchingCubes yields congruent
> triangles for surfaces introduced by a border-less watershed separation?
> And is this the case ONLY for the introduced surfaces?
> Is there a VTK-filter that would remove congruent triangles?
> vtkCleanPolyData seems to be close to what I would need but not exactly,
> I think.
>
> Any help or hints on this are very much appreciated
> Roman
>

-- 
Roman Grothausmann

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
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