Am 14.01.2014 21:07, schrieb mikaelk:
> Hello!
>
> In short, I would like to visualize the electrostatic potential on an density
> isosurface. Thus I have two 3df files, one for potential and one for density.
>
> Similarly than in the figure in bottom of this page, except much more
> beautifully.
> http://www.cup.uni-muenchen.de/ch/compchem/pop/mep1.html
>
> I know how to do the isosurface, but I can't figure out how to set a 'volumetric
> texture' to it.

I guess you mean df3?

If we're talking about texturing the actual surface of the isosurface 
object, it should be as simple as:

isosurface {
   ...
   texture {
     pigment {
       density_file df3 "filename.df3" interpolate 1
       pigment_map {
         ...
       }
     }
   }
}

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