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

> I think what you need to do is a calibration scene, much like doing a
> calibration exposure in the Zone System for making black & white prints.

Here's something along the lines of what I was thinking, just to show the
concept. I haven't altered the media parameters (as Alain will point out) from
the example in the wiki, except for changing it to absorption of red x 10




#version 3.8;
global_settings {assumed_gamma 1.0}

#include "colors.inc"

camera {
 location <0, 0, -12.0>
 look_at 0
 //angle 30
}

light_source {<0, 2, -20> White}

#declare Container_T= texture {
   pigment {rgbt <1,1,1,1>}
   finish {ambient 0 diffuse 0}
}

#declare Scale=2;
// linear prism in y-direction: from .. ,to ..,number of points (first = last)
prism { -1.00,  1.00 , 4
       <-5.00,  0.00>, // first point
       <-5.00, -1.00>,
       < 5.00,  0.00>,
       <-5.00,  0.00>  // last point = first point !!!

   hollow
   texture {Container_T}
   interior {
      media {
         intervals 1
         samples 1,1
         absorption <10, 0, 0>
      }
   }
   translate <-2.1,0,0>
}



box {<-8, -1, 0.5>, <8, 1, 1> pigment {Red}}

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