[vtkusers] mesh quality using vtkDelaunay3D

[Prashanth Dumpuri]

All,
  I'm working on creating a tetrahedral mesh from a MR image volume.
Here's a pseudo-code of what i'm doing:
----------------------------------------
vtkMarchingCubes mcubes
   mcubes SetInput [image_reader GetOutput]
   # this ensures that i encompass the entire volume in marchin cubes
   mcubes SetValue 0 1  
   mcubes Update

vtkDecimate and vtkSmoothPolyDataFilter the marching cubes surface till
i get a smooth surface.

vtkDelaunay3D del
  del SetInput <smoothed_marching_cubes_surface.vtk>
  del SetTolerance 0.005
  del BoundingTriangulationOff
  del Update
---------------------------------------
When i look at the tetrahedral mesh created by the Delaunay3D filter,
the mesh does not conform to the surface description provided by
<smoothed_marching_cubes_surface.vtk>. I have attached two pictures :
one of the smoothed marching cubes surface and the other of the
tetrahedral mesh created from the smoothed marching cubes surface. I
used vtkMeshQuality to look at the aspect ratio of the tets and a
majority of them have an aspect ratio less than 0.25. 
I would appreciate it if someone can give me pointers on how to improve
the mesh quality.
Thanks
Prashanth

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smoothed_marching_cubes_surface.jpg
Type: image/jpeg
Size: 23736 bytes
Desc: not available
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20050610/595a0a7d/attachment.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: tetrahedral_mesh.jpg
Type: image/jpeg
Size: 13674 bytes
Desc: not available
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20050610/595a0a7d/attachment-0001.jpg>