in news:3e3e47f1@news.povray.org A J Le Couteur Bisson wrote:

> Oh, and I didn't know if the .df3 interpolation would provide a
> suitable gradient for the iso-surface calculations to work properly. 
> Has anyone tried this?
> 

Below is a snippet of code I used on frog dataset:


#declare F1=   function {
      pattern {
         density_file df3 "frog.df3"
         interpolate 1
         translate -0.5
      }
   }


isosurface{
   function {
      -F1(x,y,z)
   }
   contained_by {box{-0.5,0.5}}
   threshold -0.515
   accuracy 0.0000001
   max_gradient 145
   scale<500/500,470/500,138/500>
   scale 4
   pigment {rgb 1}
}


Ingo

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