# about superimposition

**URL:** <https://discourse.slicer.org/t/about-superimposition/22664>\
**Category:** Support\
**Created:** [March 24, 2022, 5:05am UTC](https://discourse.slicer.org/t/about-superimposition/22664 "2022-03-24T05:05:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ssopy13](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ssopy13/32/14795_2.png) [@ssopy13](https://discourse.slicer.org/u/ssopy13)\
**Post date:** [March 24, 2022, 5:05am UTC](https://discourse.slicer.org/t/about-superimposition/22664/1 "2022-03-24T05:05:54Z")

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Operating system: 3d slicer (window 64bit?) I don’t know what exactly mean…  
Slicer version:4.11  
Expected behavior: 3d model superimposition  
Actual behavior: hello, I’m user of 3d slicer 4.11 version. Then I have a question of function.  
When I use superimosition module through volumn rendering tap, (I usually superimpose pretreatment and possttreatment volume with CT bone preset) I want to control opacity of posttreatment volume. but I don’s know the tap of it. Is there any module which I must download?  
Thankyou for your helpp

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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:** [March 26, 2022, 3:31am UTC](https://discourse.slicer.org/t/about-superimposition/22664/2 "2022-03-26T03:31:16Z")

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Would you like to display pre and post treatment volumes in 3D, in the same space, using volume rendering?