"Timothy R. Cook" <tim### [at] scifi-fantasycom> wrote in message
news:3dac0e32@news.povray.org...
> hughes, b. wrote:
> > Nope, sorry, doesn't work exactly right unfortunately. Shadows aren't
> > correct.
>
> If I may ask, how do you tell if shadows are correct or not with
> something that cannot exist in nature?  There is no such thing as
> a negative light source, except perhaps a black hole, which emits
> its own radiation.

In the context I meant it would just be anti-light for POV scenes, light
subtraction. No shadowing, only removal of positive color light. I guess if
negative lights were to do as expected of such a thing, though, then they'd
actually illuminate shadows, or be a anti-shadow. They currently don't do
either I think. But as they are now it does subtract positive color lights
and ambience from the scene, except for strange artifacts left in the shadow
regions I guess.

Far as reality goes...?

I suppose some analogy could be made to the wave properties of light. Black
holes don't really shine outward, they vacuum inward and remove ordinary
light, but the interfering waves of regular light can diminish the photons
in regions.

Although you could set up a series of positive color area-spotlights to get
some bright and dark boundaries, a negative color light can counteract
within the same area-spotlight instead of needing masking objects and such.
More of a CSG for light sources idea than anything else perhaps.

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