On Thu, 21 Sep 2000 19:37:02 -0400, Spock wrote...
> Been fooling around with glows and ran across an interesting
> property... negative colors can be used to cancel or shape the
> halo.
> 
> I have included a trivial example where a negative green glow
> cancels a positive one.  This action is actually color-specific so
> you can selectively allow different frequencies to pass or not
> as required.
> 
> Not very exciting news perhaps, but it might be useful...

I've also been playing with negative glows, but using radiosity...

The dark patch in the upper right corner of the image is a single 
negative glow.

I was thinking that it might be useful in scenes where you want really 
deep shadows in an otherwise well illumiated scene.

Bye for now,
     Jamie.

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