Dave,
    You show here very well how Pov-Ray can be used as a wonderful
mathematical visualization tool.  Brilliant images too.  Would it be
possible to change the color based on the gradient of the function?  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.  It might also be interesting to change the
transparency across it.

-Ben

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