# Having trouble with creases not working as expected in SubD

**URL:** <https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683>\
**Category:** SubD\
**Tags:** mac\
**Created:** [March 19, 2023, 2:40pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683 "2023-03-19T14:40:51Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![chris16](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/chris16/32/473042_2.png) [@chris16](https://discourse.mcneel.com/u/chris16)\
**Post date:** [March 19, 2023, 2:40pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/1 "2023-03-19T14:40:51Z")

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hi there … i’m trying to figure out why i can’t get this to work but after a couple of hours trying different quad structures i’m at a loss.

so what i want to achieve here is basically the green square with all crease edges being straight lines but for some reason the left edge wants to bulge out in a curve instead of being straight. i might just have tunnel vision but i can’t see how this quad structure is flawed.

 ![Screenshot 2023-03-19 at 15.32.54](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/c/c/7/cc71fcc62f61885e27c3945d95be8426a61cfcf2.png)

the only way i can get it to work is by continuing the crease upward like so:

 ![Screenshot 2023-03-19 at 15.43.11](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/8/6/3/8632e671c4a47dc9d746de60a65a56c54aeb0bec.png)

which is not really what i want for the model. would love to understand why this happens since i’m getting much better with quads/subds as i clean up my models and convert them from nurbs to subd but i stil have many things to understand about the inner workings … this being one of them 😊

any ideas anyone ?

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**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [March 19, 2023, 2:52pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/2 "2023-03-19T14:52:57Z")

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Can you post a model or a part of it?

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**Author:** ![Tom\_P](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tom_p/32/766520_2.png) [@Tom\_P](https://discourse.mcneel.com/u/Tom_P)\
**Post date:** [March 19, 2023, 2:53pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/3 "2023-03-19T14:53:06Z")

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dear @chris16

are you aware that there is a difference between creasing a SubD-Vertex and a SubD-Edge ?

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/4/d/2/4d2f5d90418b599712df9c7cfa4085809deaf8f3.jpeg)

left to right

- no creases
- creased edges
- creased vertices and creased edges (3 of 4)

if you need more help, please post a file.  
hope this helps - kind regards - tom

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**Author:** ![chris16](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/chris16/32/473042_2.png) [@chris16](https://discourse.mcneel.com/u/chris16)\
**Post date:** [March 19, 2023, 2:55pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/4 "2023-03-19T14:55:44Z")

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hey thx Tom for your quick reply … unfortunately i can’t post the file since it’s a production file of one of my guitars. i’ll try to cut out a piece and post it.

i am aware that you can crease vertexes and edges separately … sort of 😂 … meaning i don’t really understand yet why you’d do one or the other … guess i’ll have to read up on that but couldn’t really find anything on it in the docs or web.

EDIT … ok here’s a cutout of the model:  
[creaseDebug.3dm](https://discourse.mcneel.com/uploads/short-url/ayFo6vfSelFQ0UbxxevKaW5VLYl.3dm) (3.1 MB)

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<div class="post-metadata">

**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [March 19, 2023, 3:14pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/5 "2023-03-19T15:14:17Z")

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Modeling strategies vary… I’m not such a big fan of creases and I’d suggest to use move the edges closer together where you want sharper edges. Or use the new sharp command in Rhino 8 WIP.

Also the corner in your model is not really a corner since it has 4 adjacent faces. A simple corner has 3 adjacent faces…

I’m not sure which of the edges should be creased, maybe you still need to post a full model.

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/c/6/9/c699a7c1997f12382df908ce4246b8e3c7e87acb.jpeg)

[creaseDebug.3dm](https://discourse.mcneel.com/uploads/short-url/rRRy4qk2aX3OMeWFVpEekLxVNvG.3dm) (100.7 KB)

Here’s a second option which leads to a nicer corner, no matter which of the edges are creased:

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/4/7/e/47e31a6a2874655eb0898e2df009197c08cbf9e8.jpeg)

[creaseDebug\_corner.3dm](https://discourse.mcneel.com/uploads/short-url/llHmoYyU4ZOQG063NdROGpEZme3.3dm) (93.2 KB)

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<div class="post-metadata">

**Author:** ![chris16](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/chris16/32/473042_2.png) [@chris16](https://discourse.mcneel.com/u/chris16)\
**Post date:** [March 19, 2023, 3:36pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/6 "2023-03-19T15:36:22Z")

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ah yes of course … adding edges is agreat idea. i’m also not a fan of creases but for manufacturing sometimes i need a really crisp precise edge somewhere, in this case this is the junction of the guitar’s neck and body so a crisp edge is kinda mandatory. but really many thx, this got me ‘unstuck’ and i can now move on and experiment further instead of bangin my head against the wall 🙂

i didn’t even know Rhino 8 WIP was available, that’s cool and diving into that is a perfect occupation for a sunday.

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<div class="post-metadata">

**Author:** ![inju](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/inju/32/757991_2.png) [@inju](https://discourse.mcneel.com/u/inju)\
**Post date:** [March 19, 2023, 4:20pm UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/7 "2023-03-19T16:20:43Z")

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> [@chris16](#):
>
> hi there … i’m trying to figure out why i can’t get this to work but after a couple of hours trying different quad structures i’m at a loss.

example:  
 ![000](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/a/b/9/ab99e3c1c74133534ca7eb3442a9534c1130a4be.gif)

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<div class="post-metadata">

**Author:** ![chris16](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/chris16/32/473042_2.png) [@chris16](https://discourse.mcneel.com/u/chris16)\
**Post date:** [March 20, 2023, 10:38am UTC](https://discourse.mcneel.com/t/having-trouble-with-creases-not-working-as-expected-in-subd/156683/8 "2023-03-20T10:38:39Z")

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hey thx, that’s also a great technique i hadn’t thought about