Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote in message
news:Xns### [at] 204213191226...
> "Ross Litscher" <lit### [at] osuedu> wrote in
> news:3ef87ae7@news.povray.org:
>
> >
> > Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote in message
> >>
> >> So here is a little quiz: Can anyone guess how this was done ?
> >
> > no idea really. it migh tbe interesting, but if it takes longer
> > without a light source and the images are *almost* identical, what's
> > the point? unless the non light_source image produces nice shadows,
> > which isn't evident here.
>
> Actually, this "method" does not produce shadows at all.
> (It therefore provides a way to use a shadowless light source
> to make phong highlights for isosurfaces.)
>
> The highlights in the texture are controlled by a function.
> (I.e.: The highlights are kind of "built into" the texture.)
>
> I made a macro that builds functions that can be used to
> control texture maps, pigment maps, color maps etc. for
> isosurface shapes.
>
> One just have to tell the macro about the camera position,
> the position of the "virtual" light source and the amount
> of ambient, diffuse and specular (phong) reflection for the
> surface. One can also tell the macro about how the light
> is attenuated as it "moves" away from the light source.
> (Of coarse, the macro also needs to know the function for
> the isosurface shape itself.)
>
> You can find attached 2 more images that were made with
> this macro. The "virtual" light source has the same
> position in space as in the other images. But the textures
> in the texture_map are different.
>
> I'm not sure yet if all this is useable for more than
> generating special effects.
>
>

well that all is interesting. So are these pictures. what you do continues
to amaze me, i completely love all your isosurface posts. now that i kind of
understand what you are doing here, these picture are really cool.

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