# Scale in Volume Rendering

**URL:** https://discourse.slicer.org/t/scale-in-volume-rendering/15596
**Category:** Support
**Created:** [January 19, 2021, 7:47pm UTC](https://discourse.slicer.org/t/scale-in-volume-rendering/15596 "2021-01-19T19:47:45Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Keegan\_Selig](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/keegan_selig/32/9104_2.png) [@Keegan\_Selig](https://discourse.slicer.org/u/Keegan_Selig)
#### Post date: [January 19, 2021, 7:47pm UTC](https://discourse.slicer.org/t/scale-in-volume-rendering/15596/1 "2021-01-19T19:47:45Z")

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I am wondering if there is a way to add a scale bar to the volume rendering or surface rendering window so I can see how large something is or so I can do secondary measurements with other software outside of 3DSlicer.

Thanks!

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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: [January 19, 2021, 7:51pm UTC](https://discourse.slicer.org/t/scale-in-volume-rendering/15596/2 "2021-01-19T19:51:39Z")

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You can display a ruler if you switch to orthogonal projection:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/7/27adcdc6f8c7dfa81fb0c4b3d8830918a99f194a.png)