> Your ring is 5.5 units wide, so I assumed that there is a 36.36 ratio 
> between ring radius and scattering/absorption strength... but when I 
> applied this to my test scene (not yet the real Saturn scene - for the 
> time being, I'm somewhat reluctant to further mess up its already quite 
> complicated code!) with a ring radius of 36,800 units, I only got a 
> result quite similar the images posted at the top message of this thread!
> 
> Would your scattering/absorption settings also work with just a simple 
> cylindrical pattern color map rather than your sophisticated function?
> 
> Here is my current version of the code:

I don't have much time this morning to figure it out, but it's not 
looking very promising. The illumination is not reaching the bottom 
side, as you said, not with dense scattering, anyway.

You may try to model the rings at full-size, without scaling, as sacling 
can mess up media. If that doesn't work, try keeping all your objects 
very small, like they were in my test scene. That may be the only way to 
  make this scene work with media.

The other option, of course, is to use a textured disc, or several 
stacked discs with the double_illuminate keyword, or discs with C. 
Lipka's backside illumination feature for 3.7.

Good luck!

Sam

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