Curve.FrameAt(). not equal to Horizontal Frame?

Scripting
,
1

Curve.FrameAt(). (in c#)not equal to Horizontal Frame (in grasshopper)?
in (vertical curves that is parallel to the Y or Z axis)?
I think it is bug in new update Rhino7

wrong
wrong1265×698 162 KB

Test in (Rhino 7, 7.21.22199.17001)

3

Hi @Rh-3d-p,

Try this:

test_horizontal_frame.gh (2.9 KB)

– Dale