# Segmentation in 3D

**URL:** <https://discourse.slicer.org/t/segmentation-in-3d/19222>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [August 17, 2021, 9:07am UTC](https://discourse.slicer.org/t/segmentation-in-3d/19222 "2021-08-17T09:07:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![teresabaena](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@teresabaena](https://discourse.slicer.org/u/teresabaena)\
**Post date:** [August 17, 2021, 9:07am UTC](https://discourse.slicer.org/t/segmentation-in-3d/19222/1 "2021-08-17T09:07:49Z")

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Sistema operativo: Mac  
Versión de la rebanadora:  
Comportamiento esperado:  
Comportamiento real:  
Hello good morning, I would like to know how to be able to segment in 3D by selecting a plane, that is, I need to select 2 points to segment. And I would also like to know if from a segmented image, it is possible to divide it into segments, thirds … thanks

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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:** [August 18, 2021, 5:10am UTC](https://discourse.slicer.org/t/segmentation-in-3d/19222/2 "2021-08-18T05:10:22Z")

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These all sound doable. [This](https://slicer.readthedocs.io/en/latest/user_guide/image_segmentation.html) is a good page to get started. You can also find lots of segmentation tutorials on youtube.

What do you need to segment on what kind of images?

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**Author:** ![teresabaena](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@teresabaena](https://discourse.slicer.org/u/teresabaena)\
**Post date:** [August 18, 2021, 8:52am UTC](https://discourse.slicer.org/t/segmentation-in-3d/19222/3 "2021-08-18T08:52:08Z")

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Thanks for your information. I want to segment the root of a tooth from two specific points previously selected; and then divide this root into three-thirds of equal size. Thanks!!