Hi, All.
Please help.

In this post:
http://news.povray.org/povray.general/thread/%3Cweb.4640d4eb7a83c8141d1bbab40%40news.povray.org%3E/
I tried create glass fractal.

Now tried to render one density map df3 file, and get strong radial
distortions.
This is my result: http://www.geocities.com/gplflame/test.jpg.

This is object from  which df3 file created:
http://www.geocities.com/gplflame/demo2.html

I want insert some others object to density files, and I need more
precision.

here is my pov file:

#include "metals.inc"

#declare TWOPI = 6.283185307179586476925287;
#declare RADIUS = 1;
#declare NX = 1;
#declare NY = 1;
#declare NZ = 1;
#declare DD = <NX,NY,NZ>;
#declare CC = DD / 2;
#declare VP = <0, 0 , NZ  * 1.4>;

global_settings {
 ambient_light <1,1,1>
 assumed_gamma 1
}

camera {
   location VP
   up y
   right x * 1.3333
   sky <0,0,-1>
   look_at <0,0,0>
}


light_source {
   VP + <0,0,NZ * 2>
   color rgb <1,1,1>
   media_interaction on
   media_attenuation on
   shadowless
}

#declare theinterior = interior {
   media {
      emission 1
      absorption 0.4
      density {
                  density_file df3 "example.df3"
   interpolate 2
   color_map {
      [0.00 rgb <0,0,0>]
          [0.33 rgb <0,0,1>]
                        [0.66 rgb <0,1,0>]
                        [1.00 rgb <1,0,0>]
   }
  }
 }
}

box {
   <0,0,-0>, <1,1,1>
   pigment { rgbf <1,1,1,1> }
   interior { theinterior }
   translate <-0.5, -0.5, -0.5>
   hollow
}

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