# How to smooth model boundaries

**URL:** <https://discourse.slicer.org/t/how-to-smooth-model-boundaries/8893>\
**Category:** Support\
**Created:** [October 24, 2019, 8:45pm UTC](https://discourse.slicer.org/t/how-to-smooth-model-boundaries/8893 "2019-10-24T20:45:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![NClearning](https://avatars.discourse-cdn.com/v4/letter/n/a87d85/32.png) [@NClearning](https://discourse.slicer.org/u/NClearning)\
**Post date:** [October 24, 2019, 8:45pm UTC](https://discourse.slicer.org/t/how-to-smooth-model-boundaries/8893/1 "2019-10-24T20:45:15Z")

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Operating system: Windows 10  
Slicer version: 4.11.0  
Expected behavior:  
Actual behavior:

I am trying to remove points on the boundary surface in order to create a perfectly flush boundary for a model. How would I go about smoothing this surface and removing points that make the boundary not flush?

I have attached a photo below of the points I am trying to remove.

![Boundary](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/f/6f2c2c64aaec980e3a3d72532d87f1f6d7ae52ca.png)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [October 24, 2019, 9:41pm UTC](https://discourse.slicer.org/t/how-to-smooth-model-boundaries/8893/2 "2019-10-24T21:41:03Z")

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Having points on a planar face is usually not a cause for concern and it is unusual to try to remove them. What would you like to do with the mesh? 3D print, import to CAD software, …? Why do you think these points cause problems?

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**Author:** ![NClearning](https://avatars.discourse-cdn.com/v4/letter/n/a87d85/32.png) [@NClearning](https://discourse.slicer.org/u/NClearning)\
**Post date:** [October 24, 2019, 9:48pm UTC](https://discourse.slicer.org/t/how-to-smooth-model-boundaries/8893/3 "2019-10-24T21:48:39Z")

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I have a collaborator for future CFD studies and they would like the planar face to be smooth. I have attached an image of the original model they created with (what looks to be) a uniform mesh on the planar boundary surfaces.

 ![Capture](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/9/097c7107f9576d46403296cff7c4183d7f9057e6.png)