# Editing existing atlas/point cloud

**URL:** <https://discourse.slicer.org/t/editing-existing-atlas-point-cloud/8493>\
**Category:** Support\
**Created:** [September 19, 2019, 3:22am UTC](https://discourse.slicer.org/t/editing-existing-atlas-point-cloud/8493 "2019-09-19T03:22:36Z")\
**Posts on this page:** 1\
**Showing post:** 4

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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:** [September 19, 2019, 12:35pm UTC](https://discourse.slicer.org/t/editing-existing-atlas-point-cloud/8493/4 "2019-09-19T12:35:48Z")

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> [@Yaqub\_Jonmohamadi](#):
>
> When I click on the Segments I expect the editing tools become activated but that does not happen.

Thanks for the clarification. As the message in the module shows, you need to “Select master volume to enable editing”. See instructions here: [Issue during voxelization of a model stl - #2 by lassoan](https://discourse.slicer.org/t/issue-during-voxelization-of-a-model-stl/7687/2)

> [@Yaqub\_Jonmohamadi](#):
>
> I would like to register it to the MRI images (the endoscope is capturing parts of the femur)

You can register surface of a segmented image with a surface scan using modules in SlicerIGT extension. You can either specify landmark points manually and compute registration using in Fiducial registration wizard module. You may also try to use Surface registration module to match surfaces automatically: for this you need a good initial position and surface model that does not have any extra/incorrect surface patches.

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_[View the full topic](https://discourse.slicer.org/t/editing-existing-atlas-point-cloud/8493)._