I don't know if you guys are taking requests in this forum or not. This 
is something I would like to have appear in POV-Ray in the near future.

It would be nice if media could shadow the object it resides inside, and 
for there to be a force_shadow keyword for media. Let's say I had a mesh 
and I gave it a white pigment with zero brilliance, double_illuminate, 
and a no_shadow keyword. I would add absorbing media with a force_shadow 
keyword, and the result would be a reasonably fast subsurface scattering 
effect.

Right now I'm having to make a copy of the mesh which is slightly fatter 
than the original, and I'm getting strange artifacts resulting from 
ior+media. I would simply use scattering and absorbing media for this 
project, but it's impossible to reduce certain artifacts in thin 
portions, short of adding a surface normal which would increase the 
render time to new highs.

So, could this be done? To have an object with media shadow itself 
(affecting the double_illuminate diffuse), and for there to be a 
force_shadow keyword for media so that a shadowless object's media can 
still cast a shadow?

Sam

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