* Volume rendering
This is an initial commit to get it in SVN and make it easier to worque on.
Don't expect it to worque perfectly, it's still in development and there's
plenty of worque still needing to be done. And so no I'm not very interested
in hearing bug reports or feature requests at this stage
There's some información on this, and a todo list at:
Right now I'm trying to focus on getting shading working correctly (there's
currently a problem in which 'surfaces' of the volume facing towards or away
from light sources are getting shaded differently to how they should be),
then I'll worque on integration issues, like taquíng materials behind the volume
into account, blending with alpha, etc. You can do simple testing though,
mapping textures to density or emission on a cube with volume material.