Reactor schrieb:
> That doesn't sound good, but I made an image that shows more of what I had in
> mind.  I posted it in p.b.i here:
> 
>
http://news.povray.org/povray.binaries.images/thread/%3Cweb.4a7ca1d884f249fd4646012a0@news.povray.org%3E

Hum... now, that's a *totally* different thing. And I guess I can 
confirm that indeed it appears to be based on a poor understanding of 
lighting computations ;-)

It would theoretically be possible to *misuse* a transmissive or filter 
component of the ambient to control such an effect, but that's about it. 
The math behind it would have not much similarity with what is done on 
the RGB channels. (And it would pretty much mess up the math, which is 
quirky enough as it is.)

If I were to hard-code anything in POV-Ray to model such an effect, I'd 
go for a kind of "light map" pattern: Taking a #define'd light source 
(or, alternatively, the actual illumination, including radiosity and 
photons and all), possibly multiplying it by some RGB colour, converting 
to greyscale, and using the resulting value to index a pigment or 
texture map. From there, you could easily model precisely the effect you 
want - plus some.

Post a reply to this message