Alain wrote:
> I'd use a flatened sphere just large enough to completely contain the 
> two medias.
> The render time will be somewhat longer, but emissive media is prety fast.

sometimes, the simplest solutions are hard to see.  You're very right: 
putting two medias, each one translated from the other, should work. 
Somehow, I got into thinking that, because the media shape is spherical, 
they should each be contained in its own sphere... :P

Thanks, Columbus...

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