# How to annotate segments on a .ply model

**URL:** <https://discourse.slicer.org/t/how-to-annotate-segments-on-a-ply-model/37440>\
**Category:** Support\
**Created:** [July 18, 2024, 4:08am UTC](https://discourse.slicer.org/t/how-to-annotate-segments-on-a-ply-model/37440 "2024-07-18T04:08:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![achernov](https://avatars.discourse-cdn.com/v4/letter/a/7cd45c/32.png) [@achernov](https://discourse.slicer.org/u/achernov)\
**Post date:** [July 18, 2024, 4:08am UTC](https://discourse.slicer.org/t/how-to-annotate-segments-on-a-ply-model/37440/1 "2024-07-18T04:08:38Z")

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Hi! I am a new one here. Could you please help me to understand how to start segmentation if I have a .ply model only?

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [July 18, 2024, 5:46am UTC](https://discourse.slicer.org/t/how-to-annotate-segments-on-a-ply-model/37440/2 "2024-07-18T05:46:09Z")

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[https://slicer.readthedocs.io/en/latest/user\_guide/modules/segmentations.html#import-an-existing-segmentation-from-model-surface-mesh-file](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmentations.html#import-an-existing-segmentation-from-model-surface-mesh-file)