I’ve being coding some real volumetrics for Blender, a Raycaster volumetrics, for any object interior media, still the raycaster are in early stages so dont expect it to soon (the title is for marketing :D:evilgrin:) but seriously, currently I could do renders! (by the way its not only for procedurals volumetrics, but also for scientific visualization (volumetrics from files and datasets))
Volumetrics could have any interior textures, from the material stack and from the shader tree , here are some render testings.
NOTE: everything are a simple cube, no other geometry!!
He should probably have Brecht or an experienced interface developer code the interface for him, he (not Brecht) does all the grunt work, let someone else code the interface.