# Exporting outlines of segmented objects

**URL:** <https://discourse.slicer.org/t/exporting-outlines-of-segmented-objects/5771>\
**Category:** Support\
**Created:** [February 13, 2019, 10:38pm UTC](https://discourse.slicer.org/t/exporting-outlines-of-segmented-objects/5771 "2019-02-13T22:38:25Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [February 14, 2019, 3:01pm UTC](https://discourse.slicer.org/t/exporting-outlines-of-segmented-objects/5771/2 "2019-02-14T15:01:29Z")

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You can use the hollow effect to get the surface. Then if you want the coordinates of the points you can export to labelmap and use numpy.where.

> [@New segment editor effect for creating hollow objects](https://discourse.slicer.org/t/new-segment-editor-effect-for-creating-hollow-objects/2464):
>
> Making a solid segment hollow is useful in many applications, such as creating 3D-printable vessel walls from contrast-CT volumes. While it was possible to create hollow segments in 3D Slicer by using Margins and Logical operators effect, it was not very convenient. A new effect - Hollow - has been added to Segment editor to create hollow objects from solid objects in one simple step. Short demo video: [[Make hollow - new segment editor effect in 3D Slicer] ](https://www.youtube.com/watch?v=jtDHTaAEilU)

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