On 2020-05-02 9:27 AM (-4), Bald Eagle wrote:
> Hopefully this is to spec.
>
> The green circles are torus{} objects to show that the cross section is indeed
> exactly circular.
>
> Not my best work, and it's only a parametric, not an implicit equation, but
> perhaps I can "implicitize" it.
This is a test of an equation posted by Sebastian H in 2006. The shape
appears to be exact, but the max_gradient is a nightmare, and I don't
know how it stable the gradients are. The post is at:
https://news.povray.org/4409cd2a%40news.povray.org
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