# Obj file segmentation

**URL:** <https://discourse.slicer.org/t/obj-file-segmentation/34529>\
**Category:** Support\
**Created:** [February 25, 2024, 3:48pm UTC](https://discourse.slicer.org/t/obj-file-segmentation/34529 "2024-02-25T15:48:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gokcetaniyan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/gokcetaniyan/32/69479_2.png) [@gokcetaniyan](https://discourse.slicer.org/u/gokcetaniyan)\
**Post date:** [February 25, 2024, 3:48pm UTC](https://discourse.slicer.org/t/obj-file-segmentation/34529/1 "2024-02-25T15:48:28Z")

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I have data in obj format. I want to segment the bones in this data. In “Data” module, I right clicked my data and selected “convert model to segmentation mode”. Then I went to the “segment editor” section. None of the segmentation tools were active in this section. I was asked to select the source volume, but I don’t know what to choose in this section. When I clicked on source volume, there was no object to select. Could you give information about how to segment from a data in obj format?

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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:** [February 25, 2024, 5:48pm UTC](https://discourse.slicer.org/t/obj-file-segmentation/34529/2 "2024-02-25T17:48:09Z")

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For segment editor to work, it needs to have a master volume. The step you descrbed only created the segmentation. To create a scalar volume, right click on the segmentation you just created in Data module, and choose “export as a label map” option. Then you can specify that label map as the source volume in the segment editor and use the tools.

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**Author:** ![gokcetaniyan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/gokcetaniyan/32/69479_2.png) [@gokcetaniyan](https://discourse.slicer.org/u/gokcetaniyan)\
**Post date:** [February 27, 2024, 10:54am UTC](https://discourse.slicer.org/t/obj-file-segmentation/34529/3 "2024-02-27T10:54:55Z")

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Thank you very much!