Hello, I don’t understand why 2 straight line have tangent snap to circle doesn’t split the circle. I found that one of the line didn’t touch the circle. Should a tangency between 2 curves touches each others?
circle doesn’t split.3dm (40.9 KB)
It looks like a bug to me.
Use the Intersect command to check that two objects actually intersect. In this example only one line intersects the circle.
I made a line using the Tangent Osnap and that line did not interset the circle; same as in the example.
I made a line using Line with Tangent option starting from the curve. The resulting line intersects the circle.
This looks liike a bug with the Tangent Osnap to me.
@VinPo You can add a file to a post using the Edit feature of the forum.
Thanks for reply. And yes I was suddenly blinded lol 
I see this too, it may have to do with the fact that one of the lines ends at the curve seam of the circle; rotate the circle to get the seam out of the way and the split works. I have created a YouTrack item for this https://mcneel.myjetbrains.com/youtrack/issue/RH-83591/
