# Markuppoints to freesurferoutput segment/parcellation correlations on 2dslicer viewer

**URL:** <https://discourse.slicer.org/t/markuppoints-to-freesurferoutput-segment-parcellation-correlations-on-2dslicer-viewer/18510>\
**Category:** Support\
**Created:** [July 5, 2021, 12:49am UTC](https://discourse.slicer.org/t/markuppoints-to-freesurferoutput-segment-parcellation-correlations-on-2dslicer-viewer/18510 "2021-07-05T00:49:48Z")\
**Posts on this page:** 1\
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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:** [July 9, 2021, 5:01am UTC](https://discourse.slicer.org/t/markuppoints-to-freesurferoutput-segment-parcellation-correlations-on-2dslicer-viewer/18510/2 "2021-07-09T05:01:16Z")

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This post should help:

> [@Model identity at fiducial location](https://discourse.slicer.org/t/model-identity-at-fiducial-location/16456/2):
>
> What you do is a very robust and efficient method of determining which models contain the selected point position. If you need to pick many thousands points then I would recommend keep using this method. If you just want to pick models at the current point position (or hundreds of positions but not hundreds of thousands of positions) then it is simpler to [get the model displayable manager from the view](https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Get_displayable_manager_of_a_certain_type_for_a_certain_view) and use its [Pick3D](http://apidocs.slicer.org/master/classvtkMRMLModelDisplayableManager.html#a2fb2b057ef3571dae97c1c8ef73bf289) and [GetPickedNodeID](http://apidocs.slicer.org/master/classvtkMRMLModelDisplayableManager.html#a58918fec5e28c222b26bc36470b04640) methods.

If you get stuck at any point then let us know.

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