# Local Rotations, Pivot Points

**URL:** <https://discourse.slicer.org/t/local-rotations-pivot-points/18106>\
**Category:** Support\
**Created:** [June 14, 2021, 3:40am UTC](https://discourse.slicer.org/t/local-rotations-pivot-points/18106 "2021-06-14T03:40:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Fluvio\_Lobo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fluvio_lobo/32/81262_2.png) [@Fluvio\_Lobo](https://discourse.slicer.org/u/Fluvio_Lobo)\
**Post date:** [June 14, 2021, 3:40am UTC](https://discourse.slicer.org/t/local-rotations-pivot-points/18106/1 "2021-06-14T03:40:11Z")

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Hello,

**What is the best way of performing rotations about a fiducial marker, landmark, or pivot point?**  
I would typically use registration, but I do not have a target segment (final position/rotation) for these structures. In general, I am trying to **roll** the mandible about its condyle. I am also interested in defining an axis of rotation (defined by two landmarks).

 ![local_rotations](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/7/07e0db7ff32cb2901b6049a5ef26905d7eaa29f5.png)

Ideally I could make manual rotations and then calculate distances between other landmarks using a CMF module like [Q3DC](https://cmf.slicer.org/)

Note that this is not a typical orthognathic planning, and that is the reason why I am interested in more manual/exploratory options. These cases are missing a condyle and zygomatic arch.

 ![side_view_missing_condyle](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/2/82a29ac5e6cea8e6a0dc7ce3e9768406e0badef0.png)