Hi Stefan,
did you try "Create Smoothed Polygon Model" from the context menu of your
segmentation image? You can set the parameters of the surface generation
through the preference page of the segmentation bundle.
I just had a quick look at your meshes. C3 contains degenerated triangles and
is truely garbage, that's right. But C3_iso seems to be only a non-zero-genus
surface since it contains more than one surface. "Create Smoothed Polygon
Model" mentioned above might eliminate them.
You can have a look at
"Modules\Segmentation\Algorithms\mitkShowSegmentationAsSmoothedSurface.cpp" to
see how that filter chain is working (ThreadedUpdateFunction()).
In case it doesn't work for you could add a filter to your chain which removes
all surfaces but the biggest one.
Regards,
Stefan
________________________________
Von: Stefan Dänzer [[email protected]]
Gesendet: Freitag, 21. September 2012 10:25
An: [email protected]
Betreff: [mitk-users] Manifold Genus-zero Isosurface Generation
Hi all,
I hope the preparations of the new MITK Release are going well. I wish you the
best of luck for the new Release!
I've been working on the current trunk version of mitk (git hash:
0bc212eb953e81959cd7ce943ed70d3e7d8387cd) on a linux (ubuntu 12.04 x86_64)
machine in superbuild using VTK 5.10.
I'm experiencing problems when generating an Isosurface (polygonal mesh) out of
a segmentation. The problem is that for a closed surface there are some ghost
points/edges/triangles, while I need a closed surface which is genus-zero
(satifies: #faces + #edges - #points = 2)
I have tried the following:
1. Generating an Isosurface via the Context Menu of the node (binary
segmentation) in the dataManager gives a very poor surface reconstruction, see
attachment "c3.vtk".
2. Generating an Isosurface with the Isosurface plugin gives a visually good
looking result, but there are still some ghost points/edges/triangles, see
attachment "c3_iso.vtk".
I've worked around the problem the following way for now:
Using the MeshDecimation plugin in decimatePro mode with minimal mesh reduction
percentage (1%) gives a "correct" surface without ghost p/e/ts, see attachment
"c3_iso_decim.vtk". However this is rather a misusage of mesh decimation to
correct the given mesh topology.
I have also tried to use vtkCleanPolyDataFilter in my own software to eliminate
the ghost p/e/ts without success.
Is there another possibility to generate a clean genus-zero surface in MITK.
Regards,
Stefan
--
Stefan Daenzer
Körnerplatz 8
04107 Leipzig
Tel.: +49-157-84993879<tel:%2B49-157-84993879>
"Work like you don't need the money, love like you've never been hurt and dance
like no one is watching." - Randall G Leighton
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