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On Wed, 12 Jul 2000 14:09:44 +0200, Gail Shaw wrote...
> Bob Hughes wrote in message <396c532b@news.povray.org>...
> >How about showing this on a white background? Sorry, I don't really mean
> that
> >:-}
>
> It disappears completely on a white background :-<
Add an Absorption colour which is the inverse of your emission colour,
and it should show up on white backgrounds...
This means, if you have an emission of rgb< 1, 0.2, 0.152 >, the
absorption should be rgb< 0, 0.8, 0.848 >
Bye for now,
Jamie.
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Mmmmm nice flame, looks much more like a cigerett lighter flame
in shape and distribution of colour, but maybe the yellow should
be more white and more red than it is (what I probably mean is
the yellow section needs less green in it).
--
Cheers
Steve email mailto:ste### [at] zeropps uklinuxnet
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.zeropps.uklinux.net/
or http://start.at/zero-pps
2:23am up 15 days, 2:04, 2 users, load average: 1.04, 1.05, 1.01
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This amoung the best candle flames I've seen so far. Keep up the good
work.
Ken Matassa
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On Thu, 13 Jul 2000 20:47:13 +0100, jam### [at] dh70qdu-netcom (Jamie
Davison) wrote:
>Add an Absorption colour which is the inverse of your emission colour,
>and it should show up on white backgrounds...
>
>This means, if you have an emission of rgb< 1, 0.2, 0.152 >, the
>absorption should be rgb< 0, 0.8, 0.848 >
Tsk. Add an absorption color that is the inverse of your emission
color _and_has_the_same_brightness_ . Try something like this:
#macro Brightness ( Color )
0.3*Color.r + 0.59*color.g + 0.11*color.b
#end
#macro Inverse_Color ( Color )
#local Jamie_Inverse = <1,1,1>-Color;
Jamie_Inverse / Brightness (Jamie_Inverse) * Brightness (Color)
#end
I hope it works, my newsreader isn't the best way to try out POV code
:)
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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On Sun, 16 Jul 2000 02:09:25 +0300, Peter Popov wrote...
> On Thu, 13 Jul 2000 20:47:13 +0100, jam### [at] dh70qdu-netcom (Jamie
> Davison) wrote:
>
> >Add an Absorption colour which is the inverse of your emission colour,
> >and it should show up on white backgrounds...
> >
> >This means, if you have an emission of rgb< 1, 0.2, 0.152 >, the
> >absorption should be rgb< 0, 0.8, 0.848 >
>
> Tsk. Add an absorption color that is the inverse of your emission
> color _and_has_the_same_brightness_ . Try something like this:
<snip>
That would explain why I've only had limited success playing with
emitting media on white backgrounds. Ta.
Mind you, I've not really played that much with media in any serious
manner.
Ah well, that's another piece of (useful) trivia to try and file away in
the POV related section of my brain...
Bye for now,
Jamie.
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