# How to un-stitch (un-weld) edges or vertices in SubD model?

**URL:** <https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405>\
**Category:** SubD\
**Tags:** windows\
**Created:** [December 23, 2021, 2:36pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405 "2021-12-23T14:36:54Z")\
**Posts on this page:** 15\
**Page:** 1

<div class="post-metadata">

**Author:** ![user2585](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/user2585/32/734861_2.png) [@user2585](https://discourse.mcneel.com/u/user2585)\
**Post date:** [December 23, 2021, 2:36pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/1 "2021-12-23T14:36:54Z")

</div>

It would be very helpful, like it was possible with T-Splines. Thanx.

---

<div class="post-metadata">

**Author:** ![nathanletwory](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/nathanletwory/32/482880_2.png) [@nathanletwory](https://discourse.mcneel.com/u/nathanletwory)\
**Post date:** [December 23, 2021, 2:41pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/2 "2021-12-23T14:41:34Z")

</div>

Have you tried the commands `_UnweldEdge` and `_UnweldVertex`? Use them in combination with sub-object selection.

---

<div class="post-metadata">

**Author:** ![user2585](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/user2585/32/734861_2.png) [@user2585](https://discourse.mcneel.com/u/user2585)\
**Post date:** [December 23, 2021, 3:00pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/3 "2021-12-23T15:00:23Z")

</div>

It is working, thanx.  
However, there is no button command for \_UnweldVertex, does it means I have to make custom button for \_UnweldVertex command?

---

<div class="post-metadata">

**Author:** ![nathanletwory](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/nathanletwory/32/482880_2.png) [@nathanletwory](https://discourse.mcneel.com/u/nathanletwory)\
**Post date:** [December 23, 2021, 3:02pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/4 "2021-12-23T15:02:30Z")

</div>

@pascal knows if there are supposed to be buttons for that. But you can indeed always make your own.

---

<div class="post-metadata">

**Author:** ![pascal](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pascal/32/479395_2.png) [@pascal](https://discourse.mcneel.com/u/pascal)\
**Post date:** [December 23, 2021, 4:23pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/5 "2021-12-23T16:23:49Z")

</div>

Hello - there is currently not a button for that - it should probably be on the right mouse button of WeldVertices -  
 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/0/8/7/0870fb5ceb1712ada340522843515576be8c97df.png)

I’ll add that for V8, and yes you can edit that button in your setup and add

`! _UnweldVertex`

as the right mouse button command.  
[RH-66785](https://mcneel.myjetbrains.com/youtrack/issue/RH-66785) Toolbar: UnweldVertex

-Pascal

---

<div class="post-metadata">

**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:** [November 23, 2022, 1:11am UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/6 "2022-11-23T01:11:19Z")

</div>

[RH-66785](https://mcneel.myjetbrains.com/youtrack/issue/RH-66785) is fixed in the latest [WIP](https://discourse.mcneel.com/t/welcome-to-serengeti/9612)

---

<div class="post-metadata">

**Author:** ![ShynnSup](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/shynnsup/32/767220_2.png) [@ShynnSup](https://discourse.mcneel.com/u/ShynnSup)\
**Post date:** [February 6, 2024, 2:51pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/7 "2024-02-06T14:51:23Z")

</div>

This does not work with SubD or am I doing something wrong?

---

<div class="post-metadata">

**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [September 16, 2025, 9:53am UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/8 "2025-09-16T09:53:56Z")

</div>

**Weld** and **Unweld** operate only on polygon meshes, not SubD surfaces.

---

<div class="post-metadata">

**Author:** ![theoutside](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/theoutside/32/473900_2.png) [@theoutside](https://discourse.mcneel.com/u/theoutside)\
**Post date:** [September 16, 2025, 4:44pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/9 "2025-09-16T16:44:26Z")

</div>

unweldedge works on subd

---

<div class="post-metadata">

**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [September 16, 2025, 5:47pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/10 "2025-09-16T17:47:36Z")

</div>

Odd, I unwelded the two halves of a simple SubD surface, the entire edge loop, yet it is still one item when selected.

---

<div class="post-metadata">

**Author:** ![theoutside](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/theoutside/32/473900_2.png) [@theoutside](https://discourse.mcneel.com/u/theoutside)\
**Post date:** [September 16, 2025, 6:14pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/11 "2025-09-16T18:14:36Z")

</div>

you can split subds using the split at edgeloop command in the subd edit menu.

---

<div class="post-metadata">

**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [September 16, 2025, 6:18pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/12 "2025-09-16T18:18:45Z")

</div>

Ah, thanks, so in Rhino, one doesn’t use unweld to take things apart.

---

<div class="post-metadata">

**Author:** ![theoutside](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/theoutside/32/473900_2.png) [@theoutside](https://discourse.mcneel.com/u/theoutside)\
**Post date:** [September 16, 2025, 6:35pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/13 "2025-09-16T18:35:32Z")

</div>

not for subd.

---

<div class="post-metadata">

**Author:** ![BrianJ](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/brianj/32/751593_2.png) [@BrianJ](https://discourse.mcneel.com/u/BrianJ)\
**Post date:** [September 17, 2025, 7:55pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/14 "2025-09-17T19:55:56Z")

</div>

Use the Explode command to separate a disjoint SubD or mesh into separate parts.

---

<div class="post-metadata">

**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [September 17, 2025, 10:49pm UTC](https://discourse.mcneel.com/t/how-to-un-stitch-un-weld-edges-or-vertices-in-subd-model/135405/15 "2025-09-17T22:49:41Z")

</div>

Yeah, there’s two ways: Split or Unweld and then Explode.