Problem with curve intersection&overlap

[chris.lim]

I wanted to get overlaps between these two curves below

but got 3 intersection points instead.

is there any problem with my python code?
overlap_error.gh (6.4 KB)

[AndersDeleuran]

This might be related to this old issue:

PolylineCurve with CurveSelf Intersection not acting as expected

Hi All, I’m trying to wrap my head around how the Rhino.Geometry.Intersect.Intersection.CurveSelf class deals with Polyline Curves. See images below and attached files for case reference. As far as I can tell it works as expected when the intersection event type is a point (see Case C). However it seems to miss cases where the intersection event type is an overlap (see Case D and E). This might just be me misunderstanding how the class is supposed to work. However, I’ve made two additional obs…

[chris.lim]

So this issue was older than 4years
I’d better make detour for this. Thanks a lot!