# Set Scale Bar in a 3D scan

**URL:** <https://discourse.slicer.org/t/set-scale-bar-in-a-3d-scan/35312>\
**Category:** Support\
**Created:** [April 5, 2024, 2:09pm UTC](https://discourse.slicer.org/t/set-scale-bar-in-a-3d-scan/35312 "2024-04-05T14:09:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![juanslo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/juanslo/32/77875_2.png) [@juanslo](https://discourse.slicer.org/u/juanslo)\
**Post date:** [April 5, 2024, 2:09pm UTC](https://discourse.slicer.org/t/set-scale-bar-in-a-3d-scan/35312/1 "2024-04-05T14:09:06Z")

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Hi. How can set a scale bar in a 3D scan? I need to visualize a ruller, or someting like that.

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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 5, 2024, 2:38pm UTC](https://discourse.slicer.org/t/set-scale-bar-in-a-3d-scan/35312/2 "2024-04-05T14:38:24Z")

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You can switch to orthographic projection and enable ruler in the [3D view controller](https://slicer.readthedocs.io/en/latest/user_guide/user_interface.html#d-view).