# Is it possible to use Slicer to directly edit a 3D voxel volume?

**URL:** <https://discourse.slicer.org/t/is-it-possible-to-use-slicer-to-directly-edit-a-3d-voxel-volume/46859>\
**Category:** Support\
**Created:** [April 28, 2026, 3:33pm UTC](https://discourse.slicer.org/t/is-it-possible-to-use-slicer-to-directly-edit-a-3d-voxel-volume/46859 "2026-04-28T15:33:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![PetrKryslUCSD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/petrkryslucsd/32/82208_2.png) [@PetrKryslUCSD](https://discourse.slicer.org/u/PetrKryslUCSD)\
**Post date:** [April 28, 2026, 3:33pm UTC](https://discourse.slicer.org/t/is-it-possible-to-use-slicer-to-directly-edit-a-3d-voxel-volume/46859/1 "2026-04-28T15:33:15Z")

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Has this been already solved or at least discussed? Such as inserting “voxelized” primitives (sphere, cylinder, block, …) and combining them in various ways (boolean ops?).

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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:** [April 28, 2026, 4:06pm UTC](https://discourse.slicer.org/t/is-it-possible-to-use-slicer-to-directly-edit-a-3d-voxel-volume/46859/2 "2026-04-28T16:06:24Z")

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Yes, you can use the Segment Editor’s Mask Volume effect to paint in anything into a volume. There are several options, such as paint inside/outside and smooth edges (to keep gradients clean and smooth at the segment boundary).

If you have some input meshes (sphere, etc.) then you can load them as models into Slicer (or create them in Slicer using `Create Models` module in `SlicerIGT` extension) and then:

- Go to `Segment Editor` module and create a new segmentation
- Go to `Data` module and drag-and-drop the model(s) into the segmentation node
- Go to `Segment Editor` module and use `Mask Volume` effect to paint the segment into the volume