> > I'm not too familiar with user-defined isosurfaces but will need to become so to
> > do some of the things I am planning, so thanks for the tutorial.
>
> You seem to be well on your way.  In my experience, the trickiest part was
> figuring out the max_gradient, but once you understand conceptually what's going
> on, that becomes fairly easy to deal with.

I have used POV-Ray for a while, but this is the first time I have posted an
image of any kind.

LarsR has provided the checkered plane and a reflective surface. My tweak is
spherically symmetric. Does that count?

JimT.

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