# how to edit an obj file 

**URL:** <https://discourse.slicer.org/t/how-to-edit-an-obj-file/46869>\
**Category:** Support\
**Created:** [April 29, 2026, 3:45pm UTC](https://discourse.slicer.org/t/how-to-edit-an-obj-file/46869 "2026-04-29T15:45:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ellenku](https://avatars.discourse-cdn.com/v4/letter/e/958977/32.png) [@ellenku](https://discourse.slicer.org/u/ellenku)\
**Post date:** [April 29, 2026, 3:45pm UTC](https://discourse.slicer.org/t/how-to-edit-an-obj-file/46869/1 "2026-04-29T15:45:55Z")

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Hello!

I have a bunch of cranial endocast saved in obj form. I want to try to section of the cerebellum region, and I think this should be possible in maybe segment editor. However, since the obj is mesh model, i cannot edit it in segment editor. How could I get to meausure the surface area and volume of only a section of the endocast?

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**Author:** ![ebrahim](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ebrahim/32/13403_2.png) [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Post date:** [April 29, 2026, 4:08pm UTC](https://discourse.slicer.org/t/how-to-edit-an-obj-file/46869/2 "2026-04-29T16:08:39Z")

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It may load as a model node, but then you can convert it to a segmentation node and do all the segmentation-related things with it like segment editing and segment statistics.

You can import directly to segmentation also, rather than converting: [Segmentations — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmentations.html#import-an-existing-segmentation-from-model-surface-mesh-file)

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**Author:** ![ThomasVanParys](https://avatars.discourse-cdn.com/v4/letter/t/7ea924/32.png) [@ThomasVanParys](https://discourse.slicer.org/u/ThomasVanParys)\
**Post date:** [April 30, 2026, 10:24am UTC](https://discourse.slicer.org/t/how-to-edit-an-obj-file/46869/3 "2026-04-30T10:24:37Z")

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You can edit surface meshes (e.g., OBJ, PLY, STL) using the ‘Dynamic Modeler’ module: [Slicer/Docs/user\_guide/modules/dynamicmodeler.md at main · Slicer/Slicer · GitHub](https://github.com/Slicer/Slicer/blob/main/Docs/user_guide/modules/dynamicmodeler.md). You should be able to select most of the cerebellum this way.