[Gmsh] Regular mesh only composed by tetrahedra

[Francisco Pena]

Hi,

I would like to generate a regular mesh of a cube composed only by
tetrahedra.

When I use *Transfinite Volume* (see attached file .geo) I end up with a
tetrahedral mesh, but the physical entities that define the outer surfaces
are applied in triangles that are incompatible with the tetrahedra (see
attached file .png).

With Recombine, I can create a hexahedral mesh but, according to
http://onelab.info/pipermail/gmsh/2011/006408.html, there is no easy way to
convert it into a tetrahedral mesh .

Finally, the method TransQuadTri generates not only tetrahedra but also
pyramids and prisms.
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