Onsnap center not work

Serengeti (Rhino WIP)
1

Why the snap center of the circumference of the red circle not detected? (Ultimate wip)
Osnap cen no.3dm (35.5 KB)

2

Because it is not an arc.
_SimplifyCrv turns it into an arc, and then you can get the center again.

3

Thanks.:slight_smile: