In article <39b661b9$1@news.povray.org>, "Bob Hughes" 
<per### [at] aolcom?subject=PoV-News:> wrote:

> Is it not possible to use negative color values.  If it is possible 
> then simply add one above the positive colored glow.  Not exactly a 
> thing to try for a conical shape though.

It is quite possible, in fact, it is mentioned on the POV-AFX web page, 
in the "Tricks & tips" section.
http://www.geocities.com/TimesSquare/2143/povafx10.html

However, I don't know how well this would work for a directional glow 
effect...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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