[vtkusers] decrease triangle size / tesselate = subdivision?

[Alle Meije Wink]

After some searching on the users list,

> 2. Use vtkCutter on the outer normals, and sample the volume on the
>    triangles of the cut surface. For resolution, subdivide the triangles
>    a number of times.
> 
>    The problem with this one is that close to the outer surface the
>    triangles are very small already, while the triangles in the centre
>    are very large.
> 
>    Subdivision needs to be applied 5 or 6 times to get a decent
>    resolution in the big triangles, but due to the unnecessary
>    computations in the small triangles, this takes hours to visualise
>    (interaction is practically impossible).
> 
> I have tried to get the first one to work but I'm quite stuck there at
> the moment. The documentation has some things abouth re-meshing and
> tesselation, could that be a way (instaid of using subdividision) to
> make the 2nd approach work? There are no example programs on
> tesselations so it's hard to find out...

Is it maybe possible to do exactly this with one of the subdivision
classes? That is, subdivide triangles that are too big (too large
mininum vertex length or so?) but leave the smaller ones alone.
According to the documentation of the subdivision classes, it is
possible to do subdivide all elements or to not subdivide, but it's not
possible to refine some and leave others.

Best wishes
Alle Meije



-- 

  Brain Mapping Unit
  Dept. of Psychiatry
  University of Cambridge
  Downing Site
  Cambridge CB2 3EB

  tel: (+44) (0)1223 764676
  fax: (+44) (0)1223 336581

  alle_meije at yahoo.co.uk


		
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