[Insight-users] DeformableModel SimplexMesh self-intersecting and decimation

[Kiunke, Sebastian]

Hi Luis,

as i understand QuadEdgeMesh is another strucuture for a mesh. But i want to use the SimplexMesh for deformation and image-segmentation. Could you explain to me in which way i should use the QuadEdgeMesh?

Sebastian


________________________________
Von: Luis Ibanez [luis.ibanez at kitware.com]
Gesendet: Montag, 28. Mai 2012 23:47
An: Kiunke, Sebastian
Cc: insight-users at itk.org
Betreff: Re: [Insight-users] DeformableModel SimplexMesh self-intersecting and decimation


Hi Sebastien,

You could avoid this problem by simply
using the QuadEdgeMesh class.

http://www.itk.org/Doxygen/html/classitk_1_1QuadEdgeMesh.html

The structure of the QuadEdgeMesh class
is designed from the base to ensure the
consistency of the orientation of its cells.


     Luis


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On Thu, May 24, 2012 at 6:13 AM, Kiunke, Sebastian <Sebastian.Kiunke at medizin.uni-leipzig.de<mailto:Sebastian.Kiunke at medizin.uni-leipzig.de>> wrote:
Hallo again,

i wrote a few days ago, that some Normals of my SimplexMesh are flipped and i still have no clue why. I used the ComputeNormal function of itk::SimplexMesh and i calculated it 2 times myself like written in delingette'99 and the standard way with cross-produkt.


Apart from that i have another question. When i use a model as inital  mesh for deformation, then the surface has some parts where it is slightly concave. My Problem here is, that when i deform the surface along the normals, it can happen that the surface self-intersects at these parts. Is the an opportunity to solve this problem? A Class that detects self-intersections or that can decimate the SimplexMesh? Or anything in literature to solve this problem, i didn't found something interesting yet.
When i decimate the triangulated SimplexMesh in vtk via decimatePro or QuadricDecimation, it doesent solve the problem and the mesh looks inordinate in relation to the size of the cells.


Sebastian
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