William F Pokorny <ano### [at] anonymous org> wrote:
> The max_gradient for the parametric should often be <1.0 and it can
> sometimes be <<1.0. I "think" I suggested a default max_gradient of 0.1
> for our source code would be better, but I've not made the change as yet
> in my yuqk fork. (A few example parametric{}s do need 1.0 or a little
> more).
>
> Somewhere there is a forum thread and I have data and notes, but not
> finding any of it in a quick search.
As breadcrumbed in the last epic Cousin Ricky elliptical torus thread -
May 2020 in povray.general:
https://news.povray.org/povray.general/thread/%3C5eafeab9%241%40news.povray.org%3E/?ttop=445355&toff=350
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