# Need help in Uniform remesh in Surface Toolbox

**URL:** <https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440>\
**Category:** Support\
**Created:** [August 30, 2023, 1:06am UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440 "2023-08-30T01:06:45Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![telomere](https://avatars.discourse-cdn.com/v4/letter/t/e47c2d/32.png) [@telomere](https://discourse.slicer.org/u/telomere)\
**Post date:** [August 30, 2023, 1:06am UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/1 "2023-08-30T01:06:45Z")

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Hi.  
When applying undercut remove or making a base of dental model, the side walls consist of too long voxels. So I want to remesh uniformly.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/3/23a144199245920ef00cc3597762623e2459b717.jpeg)

The first image above is the dental model where undercut remove and base making are done with meshmixer. The uniform remesh in surface toolbox works well. You can see the long voxels got splitted fine.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/d/3db846cbc3dc4979510bde15c9e52be6e0ea52bd.png)

The second image is worked by the same(undercut remove) by blender. The method of removing undercut is different. But in this model, uniform remesh doesn’t work. You can see the long side wall voxels are just the same with before.

Both models are not closed model, which mean it is open surface. I first thought the open surface status is the problem so I filled the base to make it a closed model but it didn’t work.

What is the reason and what is the solution?  
Thanks always.

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**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [August 30, 2023, 12:59pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/2 "2023-08-30T12:59:53Z")

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Did you try the Remesh tools in Meshmixer or Blender?

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<div class="post-metadata">

**Author:** ![telomere](https://avatars.discourse-cdn.com/v4/letter/t/e47c2d/32.png) [@telomere](https://discourse.slicer.org/u/telomere)\
**Post date:** [August 30, 2023, 1:36pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/3 "2023-08-30T13:36:07Z")

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Yes.  
It works well in Meshmixer but it would be the best if it works in slicer because it will make me not have to switch to meshmixer and come back to slicer.  
In blender, remesh modifier doesn’t work and quadriflow remesh takes too much time like more than 6 hours…

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**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [August 30, 2023, 1:57pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/4 "2023-08-30T13:57:33Z")

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I see. You might try the cutting tools in Slicer (Dynamic Modeler) to see if that gives you a better output than Meshmixer, then use the remeshing.

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<div class="post-metadata">

**Author:** ![telomere](https://avatars.discourse-cdn.com/v4/letter/t/e47c2d/32.png) [@telomere](https://discourse.slicer.org/u/telomere)\
**Post date:** [August 30, 2023, 2:17pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/5 "2023-08-30T14:17:38Z")

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Thanks for the reply.  
I think you’re saying to use ‘plane cut’ in Dynamic modeler so to reduce the length of side walls.  
I’ve already tried but not working.  
Thanks anyway.

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<div class="post-metadata">

**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [August 30, 2023, 3:58pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/6 "2023-08-30T15:58:44Z")

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Dynamic Modeler also has curves. There is a “Combine Models” feature for Boolean operations as well if you install the Sandbox Extension. [https://youtu.be/2MOAk2oNbKw?si=axRiZtOwbATdNCvI](https://youtu.be/2MOAk2oNbKw?si=axRiZtOwbATdNCvI)

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<div class="post-metadata">

**Author:** ![telomere](https://avatars.discourse-cdn.com/v4/letter/t/e47c2d/32.png) [@telomere](https://discourse.slicer.org/u/telomere)\
**Post date:** [August 30, 2023, 11:36pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/7 "2023-08-30T23:36:33Z")

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Sorry. I don’t get your suggestion. How would Combine Models features for Boolean operation solve my problem?

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<div class="post-metadata">

**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [August 31, 2023, 1:05am UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/8 "2023-08-31T01:05:36Z")

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Since Meshmixer and Blender are giving you a bad model after cutting (I don’t know how you’re cutting but it looks like a Boolean operation with a cylinder), rather than trying to fix the bad model, you can try something in Slicer to perform the cutting instead so maybe you won’t have a bad model that needs fixing. It might be helpful to know which cutting tools in Meshmixer and Blender you are using since there are several ways to cut a model in both programs.

If you are segmenting the model in Slicer to begin with, “cutting” it with tools in the Segment Editor might give better results than cutting the exported 3D model.

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<div class="post-metadata">

**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [August 31, 2023, 5:01pm UTC](https://discourse.slicer.org/t/need-help-in-uniform-remesh-in-surface-toolbox/31440/9 "2023-08-31T17:01:53Z")

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Actually, are you extruding after cutting? One thing you can do after you select the surface you want to extrude, is use “Modify-\> Smooth Boundary.” This reduces the number of vertices along the edge or at least spaces them out better, then you can extrude with density of 0 or 1. Then you can select the whole mesh and Remesh.

Before Smooth Boundary:

 ![2023-08-31_12-58-00](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/1/518ce9474eef1f9747eb8d39ee7c51e05784e956.jpeg)

After Smooth Boundary:

 ![2023-08-31_12-58-36](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/7/d762601662b3abc9a33f1cb8a99117d52f132609.jpeg)

Extruding after Smooth Boundary:

 ![2023-08-31_12-48-01](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/3/83fcca04914700ca393472efc522e3288ed5c37a.jpeg)