# Turn off all smoothing in segmentation

**URL:** <https://discourse.slicer.org/t/turn-off-all-smoothing-in-segmentation/1933>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [January 25, 2018, 5:24pm UTC](https://discourse.slicer.org/t/turn-off-all-smoothing-in-segmentation/1933 "2018-01-25T17:24:26Z")\
**Posts on this page:** 1\
**Showing post:** 25

<div class="post-metadata">

**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:** [November 23, 2023, 8:44pm UTC](https://discourse.slicer.org/t/turn-off-all-smoothing-in-segmentation/1933/25 "2023-11-23T20:44:13Z")

</div>

> [@chir.set](#):
>
> As for surface net, a visual change is observed in the form of a shrinking of the segment in the 3D view with the ‘Faster’ option only. The ‘Fast’ option didn’t seem to do anything. Are these two independent surface smoothing techniques? Or is the ‘Faster’ option the real one, requiring the ‘Fast’ option to be on?

`Fast` option uses the same windowed sinc smoothing filter (same as with the default flying edges surface extraction method). `Faster` option uses a different algorithm that performs smoothing during surface extraction, which is faster but less accurate. You can ask for more details in the [topic where the feature was announced](https://discourse.slicer.org/t/new-surface-model-generation-method-surfacenets/32430).

> [@chir.set](#):
>
> I fear you should re-segment everything again

It might not be necessary to redo the complete segmentation. You can change the segmentation geometry and apply slight smoothing (e.g., using joint smoothing) and see if the result is satisfactory. It may not be optimal because some details may be lost that could have been present if the segmentation were performed at finer resolution from the beginning.

---

_[View the full topic](https://discourse.slicer.org/t/turn-off-all-smoothing-in-segmentation/1933)._