I've gotten to play with my sand with subsurface scattering again. I'm 
using f_ridged_mf() in an isosurface to generate geometry. (I'm hoping 
to be able to transition to a height field for performance.)

It took a bit of abuse to get SSS working with radiosity. First, I had 
to make the outer surface at least partly opaque to give radiosity 
something to act on. On top of that, it appears that large, transparent 
objects with ior >1 cause odd artifacts with low-quality radiosity.

I had to use the following settings to be able to render without bright 
spots of light showing up:

radiosity {
       pretrace_start 0.08
       pretrace_end   0.01
       count 500

       nearest_count 10
       error_bound 0.02
       recursion_limit 1

       low_error_factor 0.2
       gray_threshold 0.0
       minimum_reuse 0.015
       brightness 1

       adc_bailout 0.01/2
}

I'm sure they could be tweaked significantly.

Test render and output are attached.

-- 
William Tracy
afi### [at] gmailcom

Today's random quote is:
I was concerned that my comics weren't nerdy enough.
     -- Shaenon K. Garrity

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