In the WIP, I encountered something strange: when I offset a particular curve and explode it, it creates additional segments in Grasshopper. And it also does so in Rhino: Note that this only happens in the WIP (9.0.25084.12305, 2025-03-25), Rhino 8 is unaffected. Offset bug.3dm (64.1 …

Hi, sorry about that. It was a regression I introduced when working on open curve trimming in Rhino 9. I opened RH-87019 to get this resolved.

@Joshua_Kennedy I found another case where this happens: [image] If I offset the curve in question to a smaller distance with a relatively high tolerance, it also adds a segment. When I offset the curve further, the result is as expected. Offset adds segment.3dm (66.3 KB)

@Joshua_Kennedy have you been able to get to this yet? I’m seeing the additional segments in offsets still. Offset extra vertices bug.gh (9.7 KB)

[image] Intuos: have you been able to get to this yet? In YT, you can follow the status of the bug: [image] State open means that the bug is not yet resolved.

The main problem right now is that Simplify curve is not able to easily get rid of these additional sections. So for anyone having issues do to the bug, here’s a workaround. You can separately filter out polylines from other multi-segmented curves and do this: [image]

This issue now seems to have made its way to Rhino 8 now as well. Version 8 SR25 (8.25.25308.13001, 2025-11-04) [image] Offset Adds segments.3dm (38.9 KB) Offset Adds segments.gh (12.0 KB)

[image] Intuos: This issue now seems to have made its way to Rhino 8 now as well. Version 8 SR25 (8.25.25308.13001, 2025-11-04) Not quite. I only ever made it merge these segments if the segment it connects to was also linear. I can see why it’d be nice to have it do a linear extension of the…

You are right, the issue is slightly different and does not emerge in closed polylines. [image] Joshua Kennedy: I only ever made it merge these segments if the segment it connects to was also linear. Does it though? If I extend the white curve in the file I posted above by 140 meters, I get …

I should have been a little more specific. Only if both segments before and after the kink are lines. That’s probably more strict than it needs to be. I definitely think there’s utility in what you’re asking for. This request to me feels a lot like adding an extend option for a corner like is reques…

You can sign me up for a smooth extension that you’ve mentioned in the YouTrack :wink:

[Bug] Offset creates additional curve segments?

Serengeti (Rhino WIP)

brian (Brian Gillespie) April 14, 2026, 9:43pm 13

RH-87019 is fixed in Rhino WIP

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[Bug] Offset creates additional curve segments?

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