# How to display color scalar bar (by Hounsfield Unit) in 3D views?

**URL:** <https://discourse.slicer.org/t/how-to-display-color-scalar-bar-by-hounsfield-unit-in-3d-views/18481>\
**Category:** Support\
**Created:** [July 2, 2021, 12:24pm UTC](https://discourse.slicer.org/t/how-to-display-color-scalar-bar-by-hounsfield-unit-in-3d-views/18481 "2021-07-02T12:24:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jumbojing](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jumbojing/32/10811_2.png) [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Post date:** [July 2, 2021, 12:24pm UTC](https://discourse.slicer.org/t/how-to-display-color-scalar-bar-by-hounsfield-unit-in-3d-views/18481/1 "2021-07-02T12:24:26Z")

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I want to know how to display color scalar bar (by Hounsfield Unit) in 3D views?  
[Display color scalar bar in 3D views](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#display-color-scalar-bar-in-3d-views)(by Radial Compression)

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**Author:** ![jumbojing](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jumbojing/32/10811_2.png) [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Post date:** [July 2, 2021, 12:25pm UTC](https://discourse.slicer.org/t/how-to-display-color-scalar-bar-by-hounsfield-unit-in-3d-views/18481/2 "2021-07-02T12:25:22Z")

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like this:

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/1/910380d0f63e6338876f2445894ea327860145e1.png)

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**Author:** ![jumbojing](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jumbojing/32/10811_2.png) [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Post date:** [July 2, 2021, 1:31pm UTC](https://discourse.slicer.org/t/how-to-display-color-scalar-bar-by-hounsfield-unit-in-3d-views/18481/3 "2021-07-02T13:31:00Z")

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![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/d/6d4fb2c6b412d970f907b3fe838fe53a936495e5.png)

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**Author:** ![jumbojing](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jumbojing/32/10811_2.png) [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Post date:** [July 3, 2021, 1:00am UTC](https://discourse.slicer.org/t/how-to-display-color-scalar-bar-by-hounsfield-unit-in-3d-views/18481/4 "2021-07-03T01:00:58Z")

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@lassoan I get the grade cylinder by the ProbeVolumeWithModel that is painted by Hu?