# Fused volume rendered images do not rotate in synchrony, seemingly don't reflect reality

**URL:** <https://discourse.slicer.org/t/fused-volume-rendered-images-do-not-rotate-in-synchrony-seemingly-dont-reflect-reality/22782>\
**Category:** Support\
**Tags:** volume-rendering\
**Created:** [March 31, 2022, 7:56pm UTC](https://discourse.slicer.org/t/fused-volume-rendered-images-do-not-rotate-in-synchrony-seemingly-dont-reflect-reality/22782 "2022-03-31T19:56:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![maxaerosat.co.za](https://avatars.discourse-cdn.com/v4/letter/m/8797f3/32.png) [@maxaerosat.co.za](https://discourse.slicer.org/u/maxaerosat.co.za)\
**Post date:** [March 31, 2022, 7:56pm UTC](https://discourse.slicer.org/t/fused-volume-rendered-images-do-not-rotate-in-synchrony-seemingly-dont-reflect-reality/22782/1 "2022-03-31T19:56:14Z")

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i managed to fuse a ct to a spect image and display the resultant fused image as a 3d volume .  
however if i rotate the fused image it appears asif it does not reflect reality , asif they still behave as seperate volmes ,(do not move in sync) i have "closed the chain rings " but it still appears something is lacking ,  
ie - i know the spect focus is in the spine - so if the other volume(ct) has opacity set to 1 i should not see the spect focus in the spine - looking from the front , or if i know it is on the right it should not show if i look from the left - would appreciate some assistance

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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 31, 2022, 10:50pm UTC](https://discourse.slicer.org/t/fused-volume-rendered-images-do-not-rotate-in-synchrony-seemingly-dont-reflect-reality/22782/2 "2022-03-31T22:50:09Z")

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You need to use the experimental multi-volume rendering feature for this. It has some [limitations](https://slicer.readthedocs.io/en/latest/user_guide/modules/volumerendering.html#limitations). If those limitations are unacceptable for you then you can [combine your volumes into one](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#combine-multiple-volumes-into-one) volume and then render it as a single volume.