On 9/8/25 14:06, Bald Eagle wrote:
>> (*) I tried inverting all the on curve points and this does NOT work as
>> I incorrectly remembered for some recent sor{} post - that must be a
>> lathe{} only thing.
...> Right, because sor is an implicit interpolation, and lathe is a 
parametric
> interpolation.

Unsure. With the lathe the reason to flip the point set order is to flip 
the normals (and perhaps too textures on parts of the resulting shape). Ref:

https://news.povray.org/povray.binaries.images/thread/%3C5745b756%241@news.povray.org%3E/

I see no reason this couldn't be true for the sor too - even if all that 
happens internally is normalizing the decreasing point during parsing 
and setting a flag to flip the normals.

That said. When I relaxed the parser's sanity checking so I could try 
and render the reversed point set I got no sor result. Given other 
discoveries this morning this might also be related to segments simply 
dropping out due how the internal cylinder bounding is being done. I 
don't know. I don't know. I don't know.

Bill P.

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