>> Too smooth. Needs to be more irregular, and more foamy. You could 
>> probably do something with an isosurface (slow) and emission media 
>> (sloooow)...
> Emissive media is not that slow, there is no shadowing to compute. 
> Scathering media is slow due to self shadowing computation.
> Emissive media is probably not what you need in this case.

Erm... I actually meant to write scattering, sorry... :-S

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