Tangent Lines strange behaviour

[ivelin.peychev]

Could be related to tolerance:

Recently there was a post:

Can this be combined into a closed BREP?

Ah sorry i missed the grasshopper part. If you absolutely have to join them in grasshopper and can’t use the native Rhino _Join command before referencing, there is no native way to do this, as the problem is in how grasshopper defines the tolerance for join operations. In the attached file is a small GhPython Component, which joins the surfaces using double the file tolerance, which is aligned with how the native Rhino _Join Command does it. Hope to help [image] joinBrepsTolerance.gh (8.1…