>> If you're using POV-Ray 3.7, try the diffuse backside illumination 
>> feature: Just add another float to the "diffuse" statement. This will 
>> have part of the illumination filter through to the other side 
>> (presuming that the rings are implemented as infinitely thin disks, 
>> otherwise you'd have to have radiosity enabled to make it work).
> 
> Sounds tempting... but does a version for Debian Linux already exist? 
> Otherwise, I will have to try it on my slow old Pentium III-933 which 
> runs Windows XP...

No binaries, but Linux sources of beta.34 have long since been released 
by now.

> No, they are not disks (which would have no interior), but very thin 
> (200 metres) cylinders!

That might be a problem then without radiosity. While the rings are 
transparent, and therefore "leak" light through the whole volume and so 
you /will/ get an effect, it might end up less realistic.

As another option, with non-zero thickness media would be the most 
realistic way to go anyway.

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