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Jellby <me### [at] privacy net> wrote:
> Among other things, gawryl saw fit to write:
>
> > i'm wondering is it possible to plot an isosurfaces (density) 3D-plots
> > based on the complex double precission numbers (ASCI file)? i haven't got
> > explicit formula for this surface, data comes from my numerical
> > calculations...
> >
> > i need to know it before i start learning povray
> > (because maybe it isn't a software which i'm looking for)
>
> In case you don't know it, there's a program called VMD
> (<http://www.ks.uiuc.edu/Research/vmd/>) which you may find useful. It can
> display isosurfaces from volumetric data in OpenGL, have a look at section
> 7 of this tutorial:
> <http://www.theochem.ruhr-uni-bochum.de/~axel.kohlmeyer/cpmd-vmd/index.html>.
> By the way, it can also export to POV-Ray (as a mesh, I guess), so you can
> fiddle with lighting and textures afterwards.
>
> --
> 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
Back to the original question: You could plot spheres that were flattened in
the z dimension. Then using the neighboring points calculate the normal to
the surface at that point and rotate the flattened sphere correspondingly.
The sphere radius needs to be just big enough to do some overlap. The above
suggestions about using transparency are excellent.
Swampie
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