# What's the different between show3D smooth and the segment's smooth?

**URL:** <https://discourse.slicer.org/t/whats-the-different-between-show3d-smooth-and-the-segments-smooth/19750>\
**Category:** Development\
**Created:** [September 19, 2021, 11:01pm UTC](https://discourse.slicer.org/t/whats-the-different-between-show3d-smooth-and-the-segments-smooth/19750 "2021-09-19T23:01:58Z")\
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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:** [September 21, 2021, 4:52pm UTC](https://discourse.slicer.org/t/whats-the-different-between-show3d-smooth-and-the-segments-smooth/19750/3 "2021-09-21T16:52:35Z")

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Surface smoothing is required for reconstructing a continuous surface mesh from discrete samples stored in a labelmap volume. This smoothing **does not remove any details from the segmentation**. If you set surface smoothing to 0 then you will see the discrete samples instead of the reconstructed surface (each voxel of the labelmap will appear as a cube).

Smoothing effect is for **removing irrelevant details** (i.e., surface noise, speckled, small holes) from the segmentation.

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