Ok, the composition is suspect and the starry background is very obviously
based on leopard. But this is the first time I've got roughly what I wanted
from scattering media. To get smoother shadows I ended up using "samples
300,1000" in method 3. The shadow contrast, which I was trying to maximise
without overbrightening the background, turned out to be highly dependent
on scattering type and light source position.

(larger version at http://www.zubenelgenubi.34sp.com/graphics/scmed.jpg -
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