# Segmentation tool

**URL:** <https://discourse.slicer.org/t/segmentation-tool/29905>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [June 7, 2023, 10:12pm UTC](https://discourse.slicer.org/t/segmentation-tool/29905 "2023-06-07T22:12:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Maurice\_Tang](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/maurice_tang/32/66330_2.png) [@Maurice\_Tang](https://discourse.slicer.org/u/Maurice_Tang)\
**Post date:** [June 7, 2023, 10:12pm UTC](https://discourse.slicer.org/t/segmentation-tool/29905/1 "2023-06-07T22:12:57Z")

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Hello,  
When I set the thresholding upper and lower limits, there are highlights in the views. However, after I applied, nothing shows up and “show 3D” also didn’t work. Is there something wrong with the way I operate?

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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:** [June 7, 2023, 10:15pm UTC](https://discourse.slicer.org/t/segmentation-tool/29905/2 "2023-06-07T22:15:21Z")

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Make sure the masking settings allow modification of the current segment. See more information in the [Segment Editor module FAQ](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmenteditor.html#cannot-edit-the-segments).