"Warp" <war### [at] tagpovrayorg> wrote in message news:3e4d2430@news.povray.org...

>   This is what I have wondered as well.

<snip>

seems to be a common trend at the moment - I fell asleep last night pondering on
this (ykybrtlw). I wasn't helped by what seemed a rather ambiguous statement in
the docs concerning filter (6.1.5):

"The color of the object is subtracted from the light passing through so this is
called subtractive transparency."

Does this sound right? It sounds as though rgbf<1,0,0,1> would subtract the red,
but allow the green and blue through, which, afaik, is not the case (or have I
just gone mad?).

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