Among other things, Slime wrote:

> 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

Is the filtering factor affected by external lighting? I mean, is the 
filtered ligt f*l*o or f*p*o? (where p is the rgb colour of the surface and 
l is the colour altered by any lighting/shadowing there might be).

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Linux User #289967 (counter.li.org)
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