# Smoothing of STL file?

**URL:** https://discourse.slicer.org/t/smoothing-of-stl-file/14925
**Category:** Support
**Tags:** segmentation, stl
**Created:** [December 7, 2020, 10:26am UTC](https://discourse.slicer.org/t/smoothing-of-stl-file/14925 "2020-12-07T10:26:24Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Keegan\_Selig](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/keegan_selig/32/9104_2.png) [@Keegan\_Selig](https://discourse.slicer.org/u/Keegan_Selig)
#### Post date: [December 7, 2020, 10:26am UTC](https://discourse.slicer.org/t/smoothing-of-stl-file/14925/1 "2020-12-07T10:26:24Z")

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Operating system: Windows 10  
Slicer version: 4.10.2

Hi there,

I am wondering what type of smoothing is applied to a segmentation once it is exported using the “Export to files…” function when it is exported as a STL.

Thanks for the help!

Keegan

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<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: [December 7, 2020, 10:11pm UTC](https://discourse.slicer.org/t/smoothing-of-stl-file/14925/2 "2020-12-07T22:11:44Z")

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Binary labelmap to closed surface representation conversion rule uses [vtkWindowedSincPolyDataFilter](https://vtk.org/doc/nightly/html/classvtkWindowedSincPolyDataFilter.html) to create a smooth polydata.

There is no additional smoothing performed during export. Closed surface representation is exported to file as is.