Am 12.02.2013 12:05, schrieb Kenneth:
> I would also have picked the sphere on the right as being more correct--but only
> because it simply appears to be reflecting the sky 'more' than the other
> (without really knowing why.) Actually, my very *first* thought was that it
> looked kind of like subsurface scattering.

As a matter of fact, when subsurface scattering is engaged, POV-Ray 
already does the right thing. This is because the whole diffuse term is 
replaced entirely by the so-called BSSRDF term, which already takes into 
account all relevant IOR-related effects (including, but not limited to, 
the fresnel effect).

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