# building 3D Slicer on Mac OS Catalina 

**URL:** <https://discourse.slicer.org/t/building-3d-slicer-on-mac-os-catalina/14187>\
**Category:** Support\
**Created:** [October 21, 2020, 2:01pm UTC](https://discourse.slicer.org/t/building-3d-slicer-on-mac-os-catalina/14187 "2020-10-21T14:01:26Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [October 21, 2020, 2:27pm UTC](https://discourse.slicer.org/t/building-3d-slicer-on-mac-os-catalina/14187/2 "2020-10-21T14:27:05Z")

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> [@New Segment Editor effect: Local threshold](https://discourse.slicer.org/t/new-segment-editor-effect-local-threshold/9233):
>
> Local threshold, a new semi-automatic segmentation method, has been added to the Segment Editor. It is available in both the 4.11.0 and 4.10.2 releases through the SegmentEditorExtraEffects extension. This effect adds connected voxels to segments that are within a specified threshold, and attempts to prevent leaks into other structures through small connecting regions. The result is similar to that of the “Level trace” effect in that it delineates a region within a certain threshold value, howev…

As indicated in the above linked post, the “Local Threshold” Segment Editor effect is available through the SegmentEditorExtraEffects extension. For info about installing extensions see [Getting Started — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/getting_started.html#extensions)

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