Christopher James Huff wrote:

> In article <3dac17d4$1@news.povray.org>,
>  "hughes, b." <omn### [at] charternet> wrote:
> 
>> 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.
> 
> Why? Ordinary lights don't darken shadows, they just fail to illuminate
> them.

This brings Terry Pratchett to my mind. Normal darkness is just the absence 
of light, but Discworld Darkness is negated light :D

OK, there are at least two ways of thinking about negative lights. If normal 
lights lighten illuminated zones and don't affect shadows, negative lights 
could:

1.- Darken "illuminated" zones, don't touch shadows. (This is the most 
logical approach)
2.- Lighten shadows, don't touch illuminated zones. (It has its logic too, 
don't you think so?)

Is there a way to achieve the second way in POV-Ray? If there isn't (and if 
there's any chance of implementing it someday), I suggest calling it 
"inverted" light.

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