[vtkusers] tetgen mesh boundaries

[Adrienne]

It seems several people are familiar with tetgen, so I was wondering if
anyone could help me out. 

I've created a tetrahedron mesh using a set of vertices stored in a .node
file. However, there are some parts on the boundary of the mesh that should
be concave. I tried to specify those nodes using the boundary marker 1, but
the mesh tetgen creates still surrounds those nodes (see node 8 below). Why
doesn't this work?

Here's a simplified example of my .node file:

#test.node
9 3 0 1
0 0 0 0 1
1 1 0 0 1
2 1 1 0 1
3 0 1 0 1
4 0 0 1 1
5 1 0 1 1
6 1 1 1 1
7 0 1 1 1
8 0.2 0.5 0.5 1

Thanks!
Adrienne



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