Le 2020-06-13 à 15:32, William F Pokorny a écrit :
> <---------------------- References. Twelve previous posts
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http://news.povray.org/povray.beta-test.binaries/thread/%3C5ee4b9e3%40news.povray.org%3E/

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> and
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http://news.povray.org/povray.beta-test.binaries/thread/%3C5ee4dc4b%241%40news.povray.org%3E/

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> To povr adding new f_elliptical_sphrswp(). As Cousin_Ricky has 
> mentioned, it is not a match for an elliptical torus (supertoroid 1,1 
> asymmetric a,b), but probably something useful. See attached images.
> 
> Of note the implementation is testing out a torus pre-filter - my f_dual 
> idea to improve isosurface performance. Idea works for performance, but 
> it introduces a gradient change away from the surface so there are 
> always max gradient warnings. The actual gradient to use is always 
> around 1.0 for the sweep itself. So, need to figure out smarter max 
> gradient determination (near roots); Create a warning on/off option for 
> isosurfaces(1) - or do both.
> 

> Bill P.

Assuming a threshold of zero, using min(f_elliptical_sphrswp() , 1)
should clamp out the areas of high gradient.
If the threshold is, or need to be, around 1, use something like 1.5 to 
2 as the clamping value.

May be worth a try.

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