Hi there!

I am trying to get the intersection between a Brep and a plane, and then orient the intersection into a XY plane. The Brep has a horizontal surface, and the trimming plane has its normal vector horizontal, so I expect to get the intersection curve as a horizontal curve in my XY plane. But it has some slope and I can not see why.

Can anybody help me? What am I doing or assuming wrong? Or why aren’t they horizontal on XY?

I already checked that:

- Trimming planes have its Y vector vertical
- Destiny planes have Y vector oriented as 0,1,0
- I also checked the intersection with horizontal planes (instead of my Brep) and I got the same result.

Thanks!

trimming_Slab_Orient.gh (18.1 KB)