Volume rendering of Irregular3DSet

[gunnar.sletta@xxxxxxxxxxx]

I've constructed a Irregular 3D set and I want to view it, and I used the
same approach as for Linear3DSet, where I simply enabled textures, and it
produced the slice planes automatically. I couldn't make this work for
irregular sets.

Do I have extract each triangle/tetrahedra and make sets out of them as
done in Delaunay.main or is there some simpler way of doing this?

Gunnar