I'm playing with the MRI data of:
ftp://www-itg.lbl.gov/pub/Whole.Frog/tomato/tomato.data.Z  (200 kB)
The set has a dimension : 256x256x64 unsigned byte pixel.
I'm having some problems with it, I think.

difference {
   isosurface {
      function { 
    	   "data_3D_1", 
         <1.0>, 
         library "i_dat3d", 
         "tomato.data", 
         <256, 256, 64, 1> 
      }
      contained_by {sphere{0,10}}
      threshold 0.9
      max_gradient 10
   }
   box {<-20,-20,-10>,<20,20,0>}
   pigment { rgb 1}
}

When I render this it looks strangely symmetric, as if one segment is 
mirrored a few times.
How big should the object be? The container has a radius of 10 and it looks 
like there is more. But when I increase the radius a sphere starts 
appearing in the middle.
What am I doing wrong? Or are the data not suitable?


Ingo

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