> The only knob I know to adjust for
> the density of the media is the color, with black being no density and
> white being some maximum.

There is no maximum color. Anywhere a color is expected, you could use
something like <10000,10000,10000>.

My general approach to media density is to take the base color I want and
multiply it by a scalar to tweak the density: <1,.5,.25>*3

One thing you can try for some artistic freedom is to use extinction 0, so
you only get the brightening effect that scattering media has, and then add
absorption on top of that. This lets you control the absorption and
"reflection" colors separately.

 - Slime
 [ http://www.slimeland.com/ ]

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