Slime wrote:

> 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*p // filtered light

Thanks for your answer. This seems to be close to POVs equation. But the 
first part probably should be 
 l*(1-t-f)
because the scene
 plane{z,0.1 pigment{rgbft <1,1,1,k,k>} finish{ambient 1 diffuse 0}}

gives a complete black image for k>=0.5 and a gray for k=0.25


-- 
POV-Ray Objects Collection: http://objects.povworld.org

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