Here is the UnwrapCurve of the BasketBall curve, using Flow, and also UnwrapCurve to get the base length(s).
Also a ReWrap of the Curve, using Flow.
There is a small change in the length of the curve, upon unwrap.
Upon rewrap, relocating the center may have resulted in a slight size variation. (The radius is still 6 inches, +/-.)
The Sphere seems to be a little bit off from the curve, perhaps due to having used Rebuild.

(Have failure to upload...) Ran out of room. Deleted a dozen old files.

Hi Rudl,

> Perhaps someone could give me a advice, may be Torolf höchstpersönlich.

(nee, glaube ich nicht... ;-)) i doubt that Torolf gives any advise any longer, because he helped in the past lost's of people and figured out later that his design ideas were often badly copied and then sold as 3D prints, for example. I can fully understand this and would also get angry when this would happen to me. Especially since those little math sculptures could make it as good jewelry designs...

Regards
Stefan

Thanks Stefan :-))

don't miss this forum and aespecially the Math 3D gallery ;)

http://forum.jotero.com/viewforum.php?f=25

No problem, as I know torolf, I haven´t expected another answer from his disciple and also from himself.

Starting from the basketball script, which plots the the intersection of a sphere and a hyperbolic paraboloid, used Flow to
unwrap the curve, blend to two circles, and re-Flow to wrap around a sphere again, as described in previous post.

After a bit of work, here is a Genus2 Basketball.

In the re-Flow process, the circles became elliptical-ish. Should have used an ellipse, instead of a circle, for the blend.

Also added a final 45 degree twist.

Nice one!

Regards
Stefan