Hi,

Here are three different views of the triazene (N3H3) molecule.

Top left: electron density
Top right: electrostatic potential
Bottom left: Laplacian of the electron density

All the three "clouds" are rendered from .df3 files generated with the help 
of quantum calculation software (gaussian98, if you care). I have been 
playing with isosurfaces as well, but it's not easy to get the scale from 
the .df3 files (all values are between 0 and 1) and there are some issues 
with the onion-like layers in the Laplacian.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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