How to get perp vectors from a planar curve at known points on it?

Rhino Developer

Asterisk June 21, 2021, 5:56pm 1

Green stuff. All is planar.

Curve.TangentAt, then rotate 90?

Copy the object to multiple points on the closed curve

dale (Dale Fugier) June 21, 2021, 6:10pm 2

Use Curve.PerpendicularFrameAt.

– Dale