Aggregate material with subsurface scattering (slpm)
- lobe: any number of lobes from the bl* or el* classes (for surface scattering),
plus a BSSRDF lobe (see slbssrdf lobe).
A material similar to the Aggregate lobe,
but allowing point-to-point light transfer within the material.
Typically there will be one or more lobes for the surface scattering,
plus one slbssrdf lobe for subsurface
All lobes will be evaluated (or sampled) and the results
simply added together.
Sum of BSDFs of all individual lobes (may include transmission
sclr 1.3 end % relative index of refraction
rgb 0.0021 0.0041 0.071 % mu_a, absorption coefficient
rgb 2.19 2.62 3 end % mu_s, scattering coefficient
rgb 0.0 0.0 0.0 % g, directionality parameter
% for Henyey-Greenstein phase function
blPhng % with a Phong highlight
sclr 0.3 end
sclr 30 end