# How to change or add the Reference Volume of a Segmentation?

**URL:** <https://discourse.slicer.org/t/how-to-change-or-add-the-reference-volume-of-a-segmentation/3458>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [July 11, 2018, 12:07pm UTC](https://discourse.slicer.org/t/how-to-change-or-add-the-reference-volume-of-a-segmentation/3458 "2018-07-11T12:07:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![MMMPPPMMM](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@MMMPPPMMM](https://discourse.slicer.org/u/MMMPPPMMM)\
**Post date:** [July 11, 2018, 12:07pm UTC](https://discourse.slicer.org/t/how-to-change-or-add-the-reference-volume-of-a-segmentation/3458/1 "2018-07-11T12:07:29Z")

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How do I change or add the Reference Volume of an Active Segmentation?

**Change?**

 ![Change_Reference_Volume](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/6/d6860054b9602b1150597ded981c271fc69912a3.png)

**Add?**

 ![Add_Reference_Volume](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/0/c034f3798d069a39e4da9f9ad99d144b2a529d42.png)

Thanks in advance

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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:** [July 12, 2018, 3:04am UTC](https://discourse.slicer.org/t/how-to-change-or-add-the-reference-volume-of-a-segmentation/3458/2 "2018-07-12T03:04:37Z")

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Currently, there is no easy way to change it (you need to create a new segmentation, set reference volume, and copy segments into it). However, @cpinter has [recently implemented this](https://github.com/Slicer/Slicer/pull/975). It should be available in the nightly build within days.

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<div class="post-metadata">

**Author:** ![MMMPPPMMM](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@MMMPPPMMM](https://discourse.slicer.org/u/MMMPPPMMM)\
**Post date:** [July 12, 2018, 9:52am UTC](https://discourse.slicer.org/t/how-to-change-or-add-the-reference-volume-of-a-segmentation/3458/3 "2018-07-12T09:52:31Z")

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Thanks, looking forward to test this.

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<div class="post-metadata">

**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:** [July 26, 2018, 12:45pm UTC](https://discourse.slicer.org/t/how-to-change-or-add-the-reference-volume-of-a-segmentation/3458/4 "2018-07-26T12:45:17Z")

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Changing geometry of segmentation binary labelmap representation to match a volume’s geometry is now available in nightly builds. Click the button on the right side of the master volume node selector in Segment Editor module.