I can imagine what it means if there is only filter and only transparency 
defined at some point of the surface -- but what is the meaning if both 
are?

That is given 
P: a point on a surface 
f: filter value at P 
t: transparency at P 
l: colour that would be the result from enlighting the point if t were zero 
o: colour that is "coming from the other side of the surface", e.g. would be 
the result if t=1 and f=0

what is the formula function(f,t,l,o) for calculating the resulting colour 
in P? Anybody?

- Micha

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

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