Showcasing a mechanism to speed up scenes with both subsurface 
scattering and radiosity.

First image: Current implementation; radiosity-based illumination is 
subject to subsurface effects; this was necessary with RC3 syntax 
because the effective object color was independent of the pigment. 
Render time: 2439 CPU seconds (>5 min real time) on a Core i7 machine.

Second image: Subsurface effects are applied to direct illumination 
only, while radiosity-based illumination is applied as if the object had 
a classic texture; this is possible with RC4 syntax because it makes 
sure that the effective object color is approximately the same with and 
without SSLT. Render time: 325 CPU seconds (<41 seconds real time) on 
same machine.

While there are obvious differences, I guess many users will feel that 
they are more than outweighed by the tremendous gain in speed, so I'm 
pretty sure it'll make it into POV-Ray soon (not sure whether it will 
make it in time for RC4 though).

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Preview of image 'subsurface_sr1_rs1_2439.png'

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