# Controlling the z on fiducial markups

**URL:** <https://discourse.slicer.org/t/controlling-the-z-on-fiducial-markups/16655>\
**Category:** Support\
**Created:** [March 20, 2021, 4:38am UTC](https://discourse.slicer.org/t/controlling-the-z-on-fiducial-markups/16655 "2021-03-20T04:38:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rebecca-green](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rebecca-green/32/10329_2.png) [@rebecca-green](https://discourse.slicer.org/u/rebecca-green)\
**Post date:** [March 20, 2021, 4:38am UTC](https://discourse.slicer.org/t/controlling-the-z-on-fiducial-markups/16655/1 "2021-03-20T04:38:47Z")

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Has anyone had an issue with fiducial markups ending up on the inside or in front or behind a surface? Is there anyway to control this when placing in 3D?

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [March 20, 2021, 4:42am UTC](https://discourse.slicer.org/t/controlling-the-z-on-fiducial-markups/16655/2 "2021-03-20T04:42:42Z")

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No, normally when fiducials are placed, they are constrained to the surface (setting below is the default). Can share an example?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/0/0078f229c9c349b949fc8f06243d54d53ce4d3cd.png)

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**Author:** ![rebecca-green](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rebecca-green/32/10329_2.png) [@rebecca-green](https://discourse.slicer.org/u/rebecca-green)\
**Post date:** [March 20, 2021, 1:53pm UTC](https://discourse.slicer.org/t/controlling-the-z-on-fiducial-markups/16655/3 "2021-03-20T13:53:46Z")

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Yeah, I checked the placement mode setting. It seems to have been some sort of a bug and/or issue with VTK multivolume rendering (which somehow got turned on). I restarted my computer and changed to Ray casting and that solved it.  
Thanks Murat!!!

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [March 20, 2021, 2:52pm UTC](https://discourse.slicer.org/t/controlling-the-z-on-fiducial-markups/16655/4 "2021-03-20T14:52:50Z")

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Yes, multi volume rendering is experimental and may have some issues. If It is keep coming back as default (after you restart slicer), check application settings-\>volume rendering to make sure that it is not set as default for some reason.