I'm looking for a (free) renderer that does realistic subsurface scattering,
using physical material parameters as input (i.e. absorption and scattering
coefficients) - or a way to do it in POV. Rendering times don't matter, even if
it takes days to render a simple wax sphere on a checkered plane. Main
prerequisite is high physical accuracy.

I had hoped for a combination of scattering and absorbing media in POV to do the
job, but it doesn't seem to work with real physical material properties - unless
someone happens to know a reliable way to convert those properties to POV media
parameters.

The parameters I have available - aside from index of refraction - are
"absorption coefficients" and "reduced scattering coefficients" for red, green
and blue light respectively (computed from measurements under the simplifying
assumption that the "phase function" is isotropic).

Any ideas?

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