On 3/11/23 16:01, Bald Eagle wrote:
> Anyone have any ideas?

I'm in the middle of another code tangle, but...

After the lemon was added and we started to bang on it, a few numerical 
issues turned up. I think most of this was discussed for a time on the 
developer mailing list. No idea what is fixed. What might github have...
Looks like https://github.com/POV-Ray/povray/pull/358 has a little on 
the lemon if you scroll down through the comments. Well, I suppose not 
would help you near term of that work in any case.

A reminder the f_torus inbuilt function implements a couple of the 
spindle modes though it is not directly documented anywhere that I know 
about. See post to povray.binaries.images

Subject: Some v38 torus vs f_torus() information.
Date: 30 Apr 2020 08:32:29

https://news.povray.org/povray.binaries.images/thread/%3C5eaac55d%241%40news.povray.org%3E/

Message: <5eaac55d$1@news.povray.org>

Running your scene with my current development povr code, and without 
sturm(a), I get the attached a result.

Bill P.

(a) - With sturm on I get a tiny nub on the ends bringing the height to
to about where the left and right shapes are. Without it it 'looks' like
the shape is a little more rounded at the ends than your equivalents. 
Might be there is still some other numerical stuff going on... It's not 
the easiest shape for the solvers.

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