Region Union doesn’t seem to be working.
Some region is missing.
ghcomp_region_union_issue.gh (6.6 KB)
If you force to make the two polylines have the same starting point, then It seems to works but still to be a buggy behavior.
ghcomp_region_union_issue_re.gh (7.4 KB)
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Scaling the two curves by factor 1.0001 and the union works fine. It may not be a solution but it could prove that this is a tolerance problem.
Overlapping geometry is generally better for boolean operations / unions / intersections and such…
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Thanks a lot! It works well!