> High!
> 
> clipka wrote:
> 
>> As another option, with non-zero thickness media would be the most 
>> realistic way to go anyway.
> 
> Yes, I also thought about using media... but then, wouldn't it render 
> dead slow?

I guess that'll depend a lot on the settings. Only light rays from a 
very shallow angle will experience any significant anisotropy while 
traversing the ring system, so presumably you can get away with very few 
samples.

> P.S. A funny situation - talking in the lingua franca of the Internet to 
> a Colognian countryman living a mere 10 kilometres (6 miles) from here...

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