I believe that it's this:

color seen =
l*(1-t)*(1-f) // color of the surface minus transmittence and filter amounts
 + o*t // transmitted light
 + f*o*l // filtered light

This is only based off of observation and thought, not from the source code
or anything. If it's correct, then f + t should never be > 1 if you want to
be physically realistic.

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

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