Dave, the first image is really beautiful. May I see the code for that?
Where do you teach? I'd love to take your class!
Best,
Dennis



"Dave Matthews" <dma### [at] wrmnwestmnscuedu> wrote in message
news:web.3f82ae85bc09b08e10dd5cfd0@news.povray.org...
> Ben T. Scheele wrote:
> >Dave,
> >    You show here very well how Pov-Ray can be used as a wonderful
> >mathematical visualization tool.  Brilliant images too.
>
> Thanks.
>
> >Would it be possible to change the color based on the gradient of the
>function?
>
> Probably, but I usually have to wait for someone like Mike Williams or
> "Sputnik" to come along and show me how ;-)
>
> >It seems like you've got something like that going with the x-ray
surface.
> >I mean for example using blue for shallower slopes and red for higher
> >slopes on the surface.
>
> Actually, that's just a coincidence in this case.  I use the function as a
> density function, then a simple color map that's black (clear) up to 0.4,
> red at 0.4, green at 0.5, red again at 0.6, then black (clear)from 0.6 to
> 1.  So the change in color is really from the change in the paramater:
> F(x,y,z) = k.  I know what you're suggesting can be done with isosurfaces,
> but I'm not sure how to do it with media.
>
> Dave Matthews
>

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