[vtkusers] detecting if surface is convex

[Dominik Szczerba]

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Curvature?

But will probably not be more robust than angles.

Dominik

Bryn Lloyd wrote:
> Hi,
> 
> 
> Is there any code in VTK that would help with detecting if a closed 3d
> surface (or equivalently a connected set of tetrahedra) is convex or
> concave?
> 
> My own attempts have been to compute the dihedral angles at each edge on
> the surface. If at least one is larger than PI -> concave. This is not
> very robust though, especially for flat surfaces.
> 
> 
> Thanks
> Bryn
> 
> 
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- --
Dominik Szczerba, Ph.D.
Computational Physics Group
Foundation for Research
on Information Technologies in Society
http://www.itis.ethz.ch
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