[Gmsh] tetrahedralization

[Ares Lagae]

I am looking to generate a tetrahedralization of a model.
The model is given as a set of triangles, and many of these triangles 
intersect.

Can gmsh generate a volume tetrahedralization of such a model? If I press 
the "3D" button in the "Mesh" menu, then nothing happens, while other models 
from the "demo" directory are tetrahedralized.

If not, is anyone aware of software that can do this? TetGen takes as input a 
piecewise linear complex, which cannot have intersecting triangles. I had no 
success with NETGEN.

Best regards,

-- 
Ares Lagae
Computer Graphics Research Group, Katholieke Universiteit Leuven
http://www.cs.kuleuven.be/~ares/