"Bill DeWitt" <the### [at] earthlinknet> wrote in message
news:3a1d464d@news.povray.org...

....
> which leads me to think that they did some sort of calculation.
>

Dunno what anyone else does - when I'm happy with the shape of my iso I set
a ridiculously high max_gradient, use eval, and then remove eval and replace
max_gradient with the value returned by eval. I tend to add 0.1 to the eval
"just in case".

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