Sweep1 - closed Rail issue

[Tom_P]

what i get

A Polycurve - 4 Curves joined to a closed Curve as rail
4 Lines in each Corner

sweep1 somehow ignores that the last shape should again be the first shape:

what i expect

if i do a fake setup, where the Curve-Seam and the shape do not match - (red x) - i get more or less the expected result…

???

sweep1_fail.3dm (156.8 KB)

thanks for some improvements here

Version 8 (8.25.25328.11002, 2025-11-24)

workaround

… is to explode the curve, do a single sweep1 per segement and join the result…
but please it is Rhino 8 in 2025 ;-(

kind regards - tom

[Gijs (Gijs de Zwart)]

thanks for reporting,

RH-90705 Sweep1: closed loop fails

ps: Other workaround: don’t check closed loop for the first round to get 3/4, and then make another sweep1 for the last segment.