Doenst it affect the background?

ZK
http://www.povplace.be.tf

Spock <spo### [at] nospamcom> schreef in berichtnieuws
39ca9ba0$1@news.povray.org...
> 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...
>
> -------------------------------- snip --------------------------------
> sphere { < 0, 0, -2000 > 1 pigment { rgb < 1, 1, 1 > } }
>
> camera { location < 0, 0, -10 > look_at < 0, 0, 0 > }
>
> /* positive */
> glow
> {
>   0.5
>   glow_type 0
>   color vnormalize( < 0, 1, 0 > )
>   location < -1, 0, 0 >
> }
>
> /* negative */
> glow
> {
>   0.5
>   glow_type 0
>   color vnormalize( < 0, -1, 0 > )
>   location < 1, 0, 0 >
> }
> -------------------------------- snip --------------------------------
>
>
>
>
>
>

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