# Wirecut ongoing issue with crease splitting

**URL:** <https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751>\
**Category:** Serengeti (Rhino BETA)\
**Tags:** windows\
**Created:** [June 8, 2026, 8:30pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751 "2026-06-08T20:30:47Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Dan\_F](https://avatars.discourse-cdn.com/v4/letter/d/e19b73/32.png) [@Dan\_F](https://discourse.mcneel.com/u/Dan_F)\
**Post date:** [June 8, 2026, 8:30pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751/1 "2026-06-08T20:30:47Z")

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Wirecut through a solid, in the shape of a flanged plate, will force the cut object to split at its creases or tangents. If I use boolen difference to cut through the flanged plate, it does not force a split. I have to disable creasesplitting prior to running any wirecut commands to preserve the part that I want. Then re-enable creasesplitting after the wirecut command. It happens with an open or closed cutting curve.

This has been an issue since rhino 8 was released. Maybe I can give it attention again.

This was created in the latest rhino wip.

 ![Screenshot 2026-06-08 152457](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/3/b/c/3bc41100f581e40624704ff3b29b6d21e7d96446.png)

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**Author:** ![scottd](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/scottd/32/494002_2.png) [@scottd](https://discourse.mcneel.com/u/scottd)\
**Post date:** [July 21, 2026, 5:46pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751/2 "2026-07-21T17:46:57Z")

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Is there a reason you want Crease splitting on all the time? The command does look at Crease splitting global variable.

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<div class="post-metadata">

**Author:** ![Dan\_F](https://avatars.discourse-cdn.com/v4/letter/d/e19b73/32.png) [@Dan\_F](https://discourse.mcneel.com/u/Dan_F)\
**Post date:** [July 21, 2026, 7:02pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751/4 "2026-07-21T19:02:54Z")

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WireCut is splitting tangent edges.

Reproduce: extrude an L-shaped profile (flange + web). The inside and outside corners where they meet are tangent arcs — smooth edges, not creases. WireCut that solid.

Expected: tangent arcs stay unsplit.  
Actual: the result is split along both tangent arcs.

Workaround: I disable crease splitting prior to wirecut to avoid the unwanted splits.

There was a time in the past where wirecut did not automatically split like this. If the current behavior is as intended then that’s fine, I suspected it wasn’t.

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**Author:** ![scottd](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/scottd/32/494002_2.png) [@scottd](https://discourse.mcneel.com/u/scottd)\
**Post date:** [July 21, 2026, 9:10pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751/5 "2026-07-21T21:10:29Z")

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Sorry, I am a bit slow. I understand your instructions, but need to look closer at the structure of the flange web object.

On my tests I am having trouble getting the correctly split and not split objects to show the differences.

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<div class="post-metadata">

**Author:** ![Dan\_F](https://avatars.discourse-cdn.com/v4/letter/d/e19b73/32.png) [@Dan\_F](https://discourse.mcneel.com/u/Dan_F)\
**Post date:** [July 22, 2026, 1:16pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751/6 "2026-07-22T13:16:22Z")

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Maybe this can help us.  
[profile extrusion wirecut.3dm](https://discourse.mcneel.com/uploads/short-url/o7WRuBbOIF0XjqC1qdkDnRk53oQ.3dm) (137.1 KB)

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**Author:** ![brian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/brian/32/504171_2.png) [@brian](https://discourse.mcneel.com/u/brian)\
**Post date:** [July 29, 2026, 9:31pm UTC](https://discourse.mcneel.com/t/wirecut-ongoing-issue-with-crease-splitting/219751/7 "2026-07-29T21:31:11Z")

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[RH-97242](https://mcneel.myjetbrains.com/youtrack/issue/RH-97242) is fixed in Rhino [BETA](https://discourse.mcneel.com/t/welcome-to-serengeti/9612)