# Geometry extraction

**URL:** https://discourse.slicer.org/t/geometry-extraction/16113
**Category:** Community
**Created:** [February 21, 2021, 3:37am UTC](https://discourse.slicer.org/t/geometry-extraction/16113 "2021-02-21T03:37:43Z")
**Posts on this page:** 1
**Showing post:** 2

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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: [February 21, 2021, 5:40am UTC](https://discourse.slicer.org/t/geometry-extraction/16113/2 "2021-02-21T05:40:43Z")

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To convert binary labelmap representation of a segmentation to closed surface, we use a faster version of marching cubes called [flying edges](https://vtk.org/doc/nightly/html/classvtkFlyingEdges3D.html) followed by Taubin smoothing and optional decimation and surface normal computation.

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