# How to mark paint 3d segment?

**URL:** <https://discourse.slicer.org/t/how-to-mark-paint-3d-segment/17687>\
**Category:** Support\
**Created:** [May 19, 2021, 6:24am UTC](https://discourse.slicer.org/t/how-to-mark-paint-3d-segment/17687 "2021-05-19T06:24:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Chintha\_Siva\_Prasad](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chintha_siva_prasad/32/7766_2.png) [@Chintha\_Siva\_Prasad](https://discourse.slicer.org/u/Chintha_Siva_Prasad)\
**Post date:** [May 19, 2021, 6:24am UTC](https://discourse.slicer.org/t/how-to-mark-paint-3d-segment/17687/1 "2021-05-19T06:24:49Z")

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How can I get a portion of 3d volume by painting on it?

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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:** [May 19, 2021, 12:41pm UTC](https://discourse.slicer.org/t/how-to-mark-paint-3d-segment/17687/2 "2021-05-19T12:41:49Z")

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You can blank out a volume outside and arbitrary region by using “Mask volume” effect in Segment Editor module. You can also crop a volume to the bounding rectangle of a segment by using “Split volume” effect (provided by SegmentEditorExtraEffects extension).