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

[Luis Ibanez]

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> 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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