Has anybody ever tried (or thought of trying) to incorporate volume
ray tracing into POV-Ray? Could anybody think of problems why this
could not be done? I haven't implemented any kind of ray tracing
so far, but I have a good idea how "classical" ray tracing works,
and a somewhat vague one about volume ray tracing. So I'm not sure
whether the two things bite each other, or whether it would be as
simple (is it simple?) as introducing a new object type into POV-Ray.
While we're at it, if anybody knows about good freely available
volume ray tracers, I'd appreciate getting pointers.