"Cousin Ricky" <ric### [at] yahoocom> wrote in message 
news:web.4991ffd7dddf939e85de7b680@news.povray.org...
> "Bob" <omniverse*charter!net> wrote:
>> Brings up a question of color that's more often than not been a 
>> frustration
>> of mine. The orange looks brown... or more precisely, it looks like a tea
>> drink.
>> Many times I tried to get a traffic cone fluorescent orange color and
>> failed. Even if the color can be attained alone, any scene change 
>> (lighting,
>> etc.) is almost sure to lose the bright orange color. That seems to go 
>> for
>> yellow sometimes, too.
>
> I read that it has to do with the way our eyes interpret the combination 
> of red
> and green phosphors.  I can't remember where, though.  Normally I'd take 
> care
> of the problem by boosting the finish ( diffuse } value, but this won't 
> work
> with glass.

Maybe you could try increasing color beyond 1, like Clipka was saying. I 
realize there's probably ways to eventually attain some desired color 
needed, but what typically causes me trouble is simply typing something up 
and not getting the expected result. I was just expressing that here, not 
meaning to hijack your rendered rainbow pics.
;)
Just now trying for that elusive orange and got this:

sphere {
  0, 1
  texture {
    pigment {
      radial
      frequency 2
      color_map {
        [0.1 color rgb <1.0,0.0,0.0> ]
        [0.2 color rgb <1.0,0.1,0.01>*1.5 ]
        [0.3 color rgb <1.0,0.1,0.01>*1.5 ]
        [0.4 color rgb <1.0,1.0,0.0> ]
        [0.5 color rgb <1.0,1.0,0.0> ]
        [0.6 color rgb <0.0,1.0,0.0> ]
        [0.7 color rgb <0.0,1.0,0.0> ]
        [0.8 color rgb <0.0,0.0,1.0> ]
        [0.9 color rgb <0.0,0.0,1.0> ]
        [1.0 color rgb <1.0,0.0,1.0> ]
      }
      triangle_wave
    }
    finish{
   // ambient 0.1 diffuse 1.5
    }
  }
  rotate 45*y
  translate <0,0,3>
}

light_source {<30, 30, -30>,1}

Which, as you can see, is a very red color with very little blue. In lieu of 
a finish tweak I went with increased color values, as was said by Clipka. 
Used in a scene might be another matter, anyway this is what I'm thinking of 
as orange (if anybody renders this and sees the same). Orange as in 
tree-borne fruit, if not traffic cone orange?

Oh, and I also liked the ceramic rainbow... just not as much as glass with 
all its play of light.

Bob

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