I also want to do similar things. I wrote my data as density file(**.df3),
and try to use the keyword "density" to be inside the isosurface function
like follows:
//=================================================begin
isosurface{
  function {
  density { density_file df3 "**.df3" interpolate 1 }
  }
  contained_by { box { 0, 1 } }
  pigment{rgb <1,0,0>}
}
//=================================================end

but errors appeared. then how to do such things??

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