Samuel Benge wrote:
> 
> Christoph, I'm guessing that foam is one of two things:
>  * a foamy function with actual 'air holes' in it, using a really high 
> max_trace_level
>  * a noise-perturbed layer of function with a similar function-based 
> pigment to achieve the foamy look

Actually it's simply part of the isosurface with a different texture 
(less transparent and some more diffuse finish).  A scattering interior 
would be nice but slow as well.

Christoph

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