Good day,
I’m encountering a problem with the Trim with Region component. There are curves it doesn’t trim in that it’s still counted as inside the region.
Trim with Region Problem.gh (24.6 KB)
I plugged in my surfaces directly as a region, it should be a closed region by then. It should trim the line considering it trimmed the others. I’m thinking maybe it’s a tolerance issue?
You use Graft a lot so I am not sure if that is a bug or not.
If you just want to trim, why not just draw a closed curve on the XY plane?
Trim with Region Problem_2.gh (30.8 KB)
Is it not true that if I plug in my surface into the region input it automatically converts it to a closed curve? So all the things you mentioned I’ve already done.
I think it could be a bug, for sure it does not behave as expected to my eyes
maybe @wim knows more about this 
stupid experiment: 6 lines and a square, two lines lie exactly on square edges
Trim_With_Region_Bug.gh (10.1 KB)
result:
if the lines are flipped the same problem appears on the opposite side:
just for the sake of experimenting, shatter gives correct results:
just because of the particular situation in this unique case, flipping the original curves produce a result that happens to be correct, but the general case will still be wrong:
Trim with Region Problem_Re.gh (31.5 KB)
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Thank you for commenting on this. If memory serves correctly, I think i saw a similar thread with the issue being the tolerance. Coz when it comes to edges touching with edges i think in rhino it could be buggy. Hopefully mcneel fixes this soon.
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Thanks @attheeast18, the document tolerance was the problem in my case!