DescriptionAdds a new closure that holds the real volumetric properties of a homogeneous medium.
This isn't quite what is intended for volume support in OSL but fills a gap in the meantime that lets us do SSS volumetrically in certain cases.
The closure is parameterized based on Jensen's hierarchical BSSRDF paper.
Patch Set 1 #Patch Set 2 : It would help to include the actual implementation of the new closure ... #
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