# Improvements in atlas management: model hierarchy refactoring

**URL:** <https://discourse.slicer.org/t/improvements-in-atlas-management-model-hierarchy-refactoring/8512>\
**Category:** Support\
**Tags:** feature\
**Created:** [September 20, 2019, 5:58pm UTC](https://discourse.slicer.org/t/improvements-in-atlas-management-model-hierarchy-refactoring/8512 "2019-09-20T17:58:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [September 20, 2019, 5:58pm UTC](https://discourse.slicer.org/t/improvements-in-atlas-management-model-hierarchy-refactoring/8512/1 "2019-09-20T17:58:36Z")

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The preview version of 3D Slicer starting today (Sep 20) includes a major change that affects the management of atlases. The two main goals of the change are:

- Change the way visibility works in subject hierarchy for folders
- Remove the old model hierarchy concept from Slicer

Details:

1. Use only folders in subject hierarchy instead of the former hybrid folder / model hierarchy way. It had some issues, such as erroneous visibility setting, or the inability to create folders that allow overriding display properties (only programmatically or opening a scene). This new mechanism allows

2. Update Models module to use the updated hierarchies

Please note that further speedup of show/hide and display property override will hopefully follow soon.

A short video about the feature:

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**Author:** ![Fernando](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fernando/32/5640_2.png) [@Fernando](https://discourse.slicer.org/u/Fernando)\
**Post date:** [September 28, 2019, 10:30am UTC](https://discourse.slicer.org/t/improvements-in-atlas-management-model-hierarchy-refactoring/8512/2 "2019-09-28T10:30:11Z")

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This looks great!

Is there any documentation I can use to go from a bunch of volumes + segments to a nice atlas hierarchy like this?