"Bald Eagle" <cre### [at] netscapenet> wrote:

> Sure - I think you could take something like a gradient pigment pattern, apply
> that color mapping to it, and then use that as a function.   Then you could pass
> in a space coordinate with a vector component parallel to that gradient, and the
> function would return the interpolated color vector as a result.
> You would of course, have to write / generate 3 functions - one for the .r, .g,
> and .b components.



Like this:



#version 3.8;
global_settings {
 assumed_gamma 1.0
}


#include "math.inc"

#declare E = 0.000001;

#declare Camera_Orthographic = true;  //
<----################################################################################

#declare Camera_Position = <0, 0, -20>;  // front view
#declare Camera_Look_At  = <0, 0,  0> ;
#declare Fraction = 1;     // functions as a zoom for the orthographic view: 4
zooms in 4x, 8 zooms in 8x, etc.

#declare Aspect = image_width/image_height;
// ###########################################
camera {
 #if (Camera_Orthographic = true)
  orthographic
  right     x*image_width/(Fraction)
  up   y*image_height/(Fraction)
 #else
  right     x*image_width/image_height
  up y
 #end
 location  Camera_Position
 look_at   Camera_Look_At}
// ###########################################

sky_sphere {pigment {rgb 1}}
light_source {<0, 0, -image_width> color rgb 1}



#declare MyColorMap = color_map {
  [ 0.00 rgb < 1.00, 0.00, 0.00> ]
  [ 0.50 rgb < 1.00, 1.00, 0.00> ]
  [ 1.00 rgb < 0.00, 0.00, 1.00> ]
  }


#declare Gradient = pigment {gradient x color_map {MyColorMap}}

box {<0, image_height/3, 0>, < image_width, 2*image_height/3, 0.01> pigment
{Gradient scale image_width} translate -x*image_width/2}


#declare GradientFunction = function {pigment {Gradient}}




#for (XX, 16, 640-16, 16)
 #local R = GradientFunction (XX/image_width, 0, 0).red;
 #local G = GradientFunction (XX/image_width, 0, 0).green;
 #local B = GradientFunction (XX/image_width, 0, 0).blue;
 sphere {<XX, 0, 0> 5 pigment {rgb <R, G, B>} translate -x*image_width/2}
#end

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