Wasn't it jlew who wrote:
>I have a cone to which I would like to apply a rainbow-like gradient fill.
>The closest I have gotten is a "gradient y color_map", which looks okay,
>except that I would like the color bands to be parallel to the long edges
>of the cone, and increase proportionally to the radius (as opposed to the
>fixed with bands parallel to the center axis of the cone).  Is there a way
>to do this?

#include "colors.inc"
camera {
    location  <0,0,-3>
    look_at  0
}

light_source {<0,0,-10>, White}


 cone {
  <-1,0,0>, .1, <1,0,0>, .5
  texture {
    pigment {
     radial frequency 2
      color_map {
        [0.0 color Violet]
       [1/6 color Blue]
       [2/6 color Green]
       [3/6 color Yellow]
       [4/6 color Orange]
       [5/6 color Red]
       [1.0 color Violet]
       }
     }
     rotate z*90
   }
   finish { ambient 1 }
  }

Change the frequency value to control how many times the colours go
round the cone.

-- 
Mike Williams
Gentleman of Leisure

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