# How to set the opacity for stl file?

**URL:** <https://discourse.slicer.org/t/how-to-set-the-opacity-for-stl-file/1659>\
**Category:** Support\
**Created:** [December 14, 2017, 2:18pm UTC](https://discourse.slicer.org/t/how-to-set-the-opacity-for-stl-file/1659 "2017-12-14T14:18:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [December 14, 2017, 2:18pm UTC](https://discourse.slicer.org/t/how-to-set-the-opacity-for-stl-file/1659/1 "2017-12-14T14:18:36Z")

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Operating system:win7  
Slicer version:12-3  
Expected behavior:  
Actual behavior:

 ![捕获](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/1/118b45eb331c4e324f68124ba69c4a38950a0418.jpeg)

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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:** [December 14, 2017, 2:32pm UTC](https://discourse.slicer.org/t/how-to-set-the-opacity-for-stl-file/1659/2 "2017-12-14T14:32:40Z")

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Use Slicer-4.8 or later. Opacity can be either adjusted in the tree by double-clicking the 1.00 value; or in Display/3D Display section adjust Opacity slider.

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [December 15, 2017, 2:12pm UTC](https://discourse.slicer.org/t/how-to-set-the-opacity-for-stl-file/1659/3 "2017-12-15T14:12:41Z")

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thank you for your prompt reply!