Darren New nous apporta ses lumieres en ce 05-01-2007 11:56:
>>> There's no such thing as negative colors.
>>> How do you expect "minus blue" to look?
>> I would have thought yellow.

> rgb <0, 0, -1> has no components that would contribute to yellowness. 
> Anything that might emit "yellow" light is zero. The closest might be 
> that it "emits" negative blue, making things nearby more yellow, sucking 
> away the blue via radiosity.

> Or maybe it's a quark, where it would be a red/antiblue quark or 
> something. ;-)

In a radiosity scene, a negative colour will effectively suck out the colours 
from it's environment.
You also can have negative light that will darken your scene and any high 
ambient object.
Also, a negative colour will apears differently in reflections and refractions 
than plain black.

-- 
Alain
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Fine day to work off excess energy.  Steal something heavy.

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