# Volume doesn't after I modify the voxel value

**URL:** <https://discourse.slicer.org/t/volume-doesnt-after-i-modify-the-voxel-value/4037>\
**Category:** Support\
**Created:** [September 9, 2018, 7:26pm UTC](https://discourse.slicer.org/t/volume-doesnt-after-i-modify-the-voxel-value/4037 "2018-09-09T19:26:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tien\_Qiao](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tien_qiao/32/2173_2.png) [@Tien\_Qiao](https://discourse.slicer.org/u/Tien_Qiao)\
**Post date:** [September 9, 2018, 7:26pm UTC](https://discourse.slicer.org/t/volume-doesnt-after-i-modify-the-voxel-value/4037/1 "2018-09-09T19:26:37Z")

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Operating system: Ubuntu 18.04  
Slicer version: latest from github  
Expected behavior: volume color should be changed if I modified its voxel value.  
Actual behavior: The volume appearance doesn’t change. I wonder how to trigger updating action?

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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:** [September 9, 2018, 8:42pm UTC](https://discourse.slicer.org/t/volume-doesnt-after-i-modify-the-voxel-value/4037/2 "2018-09-09T20:42:40Z")

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You can call `slicer.util.arrayFromVolumeModified(myvolumenode)`. See documentation and related functions here:

> <https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/util.py>