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How does one calculate an opposite color for use in absorbing and
emitting media ?
Advanced user question ?
--
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html
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(1 - OriginalColor) ?
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TonyB wrote:
>
> (1 - OriginalColor) ?
Won't work...
rgb<1,0,0> - rgb<1,0,0> = black.
The opposite of red is not black at least so I suspect.
--
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html
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On Mon, 27 Sep 1999 21:34:51 -0700, Ken <tyl### [at] pacbell net> wrote:
>
>
>TonyB wrote:
>>
>> (1 - OriginalColor) ?
>
>Won't work...
>
>rgb<1,0,0> - rgb<1,0,0> = black.
1 is not rgb <1,0,0>; I'm pretty sure it's rgbft <1,1,1,1,1>.
You want rgb <1,1,1> - OriginalColor.
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Ron Parker wrote:
> You want rgb <1,1,1> - OriginalColor.
so -
rgb<1,1,1> - rgb<1,0,0> = rgb <0,1,1> = opposite color ?
--
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html
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On Mon, 27 Sep 1999 21:40:11 -0700, Ken <tyl### [at] pacbellnet> wrote:
>
>
>Ron Parker wrote:
>
>> You want rgb <1,1,1> - OriginalColor.
>
>so -
>
>rgb<1,1,1> - rgb<1,0,0> = rgb <0,1,1> = opposite color ?
Exactly.
Cyan is the opposite of red.
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Ron Parker wrote:
> Cyan is the opposite of red.
Cyan = opposite of red = ok fine by me.
Thank you for your assistance gentlemen.
--
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html
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I was trying this out to do it an easy way and stumbled into errors
concerning the color vector, int( ) and #if ( ). It would be fine were
it not for the negative vector created when switching back to original
color. I didn't know vectors weren't allowed in these (and whatever
else there might be too).
// white pointlight at camera position
#declare LCX = 0;
#declare LCY = 0;
#declare LCZ = -10;
light_source { <LCX,LCY,LCZ> color rgb <1.5,1.5,1.5>
}
camera {
location <LCX,LCY,LCZ>
angle 30
look_at <0,0,0>
}
// zero or 1 (more than 1 not acceptable)
#declare EAF=0;
// original color to calc opposite of
#declare OC=.5; // <.1,.3,.9>; vector does not go into int( )
// opposite color vector (or not) [int(EAF-OC) errors wanting float
only]
#declare RGB=EAF-OC;
// convert to positive if negative [#if (RGB errors wanting float)]
#if (RGB<0) #declare RGB=-1*RGB; #end
box {-1,1 pigment {color rgb RGB} rotate <30,45,60>}
Bob
TonyB <ben### [at] panamaphoenixnet> wrote in message
news:37f03117@news.povray.org...
> (1 - OriginalColor) ?
>
>
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Ken <tyl### [at] pacbellnet> wrote:
:> (1 - OriginalColor) ?
: rgb<1,0,0> - rgb<1,0,0> = black.
Since when 1 has been equal to <1,0,0>?
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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Nieminen Juha wrote:
>
> Ken <tyl### [at] pacbellnet> wrote:
>
> :> (1 - OriginalColor) ?
>
> : rgb<1,0,0> - rgb<1,0,0> = black.
>
> Since when 1 has been equal to <1,0,0>?
Read the rest of the thread and the answer shall be revealed to you...
--
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html
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