> Some off-topic: The ring's shadow over the planet surface show other shape in
> the real Saturn, you can see this in some real photos of the planet.
> 
> http://www.jpl.nasa.gov/images/saturn/saturn1208-browse.jpg
> 
> Maybe if you scale all the scene 10.000 in size and put the light source very
> very far, the shadow appear more real.
> 

You don't need to put the light_source "very very far", you just need to 
use a parallel light_source and place it much closer, but outside the 
rings/satellites system.

Don't forget that Saturn is not solid, but a gas giant. You can simulate 
that using SSLT in the beta version or very dense scattering media with 
NO emissive media.


Alain

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