[Insight-developers] Simplex Volume Calculator

[Miller, James V (Research)]

I just took a quick look at the RegularSphere code.  I don't see 
anything that would suggest an inproper ordering. 'Course the best
way to tell would be to write out a VTK file and see if the normals
are flipped. Haven't tried that yet.

Could the problem be in the TriangleMeshToSimplexMeshFilter? This
filter takes the nice triangle mesh and converts into some other
structure based on the center points of the triangles. I guess I don't
understand what a SimplexMesh is.

TriangleMeshToSimplexMeshFilter claims to reorient the vertices for
geometry computations.  Since it looks like the triangles may have
been oriented correctly, maybe the "reorientation" code in incorrect.

The RegularSphere could still be incorrect. I just made a quick 
pass through the logic and drew a few pictures that made it seem
like it was doing the right thing.

Jim



-----Original Message-----
From: Luis Ibanez [mailto:luis.ibanez at kitware.com]
Sent: Monday, November 01, 2004 9:01 AM
To: Lorensen, William E (Research)
Cc: insight-developers at public.kitware.com
Subject: Re: [Insight-developers] Simplex Volume Calculator



Bill,

Yes, the reason is that the class is expecting the input surface
to be oriented and unfortunately it seems that the RegularSphere
surface class is not generating a triangulation with neighbor
links oriented consistently (clockwise or counter clockwise).

That can be considered to be a bug in the SphereSimplexMeshSource... 
or... maybe what we need a filter that will take a Mesh and reorder
the neighbor links in order to orient it.


   Luis


----------------------------------------
Lorensen, William E (Research) wrote:

> Luis,
> The test of the new class is failing on all platforms.
> 
> Bill
> _______________________________________________
> Insight-developers mailing list
> Insight-developers at itk.org
> http://www.itk.org/mailman/listinfo/insight-developers
> 
> 




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