The bug fixes(a) and control point relaxations for the sor{} in the next 
yuqk release were discussed in the thread:

https://news.povray.org/povray.documentation.inbuilt/thread/%3Cweb.689b6c79e72c05b2bc0c1c5925979125%40news.povray.org%3E/

The next yuqk release is also adding two new keywords to the sor{}. One 
is 'caps' and the other is 'intervals'.

The caps changes align what was done for yuqk's text{} update:

https://news.povray.org/povray.pov4.discussion.general/thread/%3C67e41261%241%40news.povray.org%3E/

The intervals keyword is followed by a string of 0 and 1 values which 
allow particular sor{} curve segments to be kept or not.

The middle image row used:

     intervals "10101"

which, left to right, indicates only the first, third and fifth of the 
five total sor{} segments are to be used.

The idea with both 'caps' and 'intervals' is to add inbuilt ways for the 
sor{} to be broken apart and the pieces textured, used in CSG or for 
debug and modeling.

The second row rotates the sor by -10*x and the third row by -45*x to 
better see the sor segments and caps, respectively.

Bill P.

(a) - Except for adjusting an older yuqk update removing the 
too-generic, single value EPSILON use in the sor code. In recent testing 
I found cases - like in the attached image - with tight, segment turns 
where those A,B,C,D internal values needed to be zeroed at closer to the 
old official POV-Ray EPSILON of 1e-10. I settled specifically on 
4.4e-12, but things are being fudged here - so we'll see how the newer, 
new zeroing limit holds up.

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On 9/15/25 19:49, William F Pokorny wrote:
> The bug fixes(a) and control point relaxations for the sor{}...

Attached another image. Here in the top row showing inverted in y, 
positive in x control points - which are already legal in POV-Ray today.

The middle row shows negative in x, not inverted / flipped, control 
points as Bill W suggested be supported for the sor{}.

The bottom row shows the difference in result.

Bill P.

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