> I've tried different wave types and I still have the same problem,
> everywhere were there is transparency on the rings with the planet
> showing through, the cloud media is gone, as if the max-trace level is
> too low. I have max_trace_level 256.
>
>

A disk is not just a surface. It is in fact the intersection of a plane 
and an infinite cylinder, showing only the cap. Anything under or behind 
it is considered inside. Media can't exist inside an object like a plane.

Add hollow to your disk and the media problem should go away.


Alain

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