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

[Scott Johnson]

Hello Sebastian,

On the issue of the normal flipping.  Are all of the vertices of polygons in the mesh defined in the same order?  i.e. clockwise or counter-clockwise?  If the order of the vertices changes the direction of the normal will flip.

		-- Scott

-----Original Message-----
From: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org] On Behalf Of Kiunke, Sebastian
Sent: Thursday, May 24, 2012 5:13 AM
To: insight-users at itk.org
Subject: [Insight-users] DeformableModel SimplexMesh self-intersecting and decimation

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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