# Slicer Looking Glass extension unavailable in Slicer 5.7 revision 32785

**URL:** <https://discourse.slicer.org/t/slicer-looking-glass-extension-unavailable-in-slicer-5-7-revision-32785/35145>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [March 27, 2024, 10:37pm UTC](https://discourse.slicer.org/t/slicer-looking-glass-extension-unavailable-in-slicer-5-7-revision-32785/35145 "2024-03-27T22:37:12Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [March 27, 2024, 10:55pm UTC](https://discourse.slicer.org/t/slicer-looking-glass-extension-unavailable-in-slicer-5-7-revision-32785/35145/2 "2024-03-27T22:55:23Z")

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SlicerLookingGlass development has not kept up with updates to newer versions of VTK which it uses. You’re not alone in wondering about the status of this extension. See other post:

> [@SlicerLookingGlass plans](https://discourse.slicer.org/t/slicerlookingglass-plans/33723):
>
> Hi all, I updated my development environment to the latest Slicer, and bumped into the issue that apparently the SlicerLookingGlass extension does not build anymore. I did some digging and it seems that the last time it was build successfully was the [nightly of November 22](https://slicer.cdash.org/index.php?project=SlicerPreview&date=2023-11-22&filtercount=1&showfilters=1&field1=buildname&compare1=63&value1=lookingglass). The problem seems to be related to the event delegation improvements ([ENH: Improve Event Delegation in qMRMLThreeDView and qMRMLSliceView · Slicer/Slicer@1cc3b2c · GitHub](https://github.com/Slicer/Slicer/commit/1cc3b2c62bf5d3836802d3aab4ce37feee6500f0)), at least that is my guess. My question is whethe…

Currently with the latest Slicer stable (5.6.1) the SlicerLookingGlass extension is not building successfully across all platforms (Windows, macOS, Linux). See build details [here](https://slicer.cdash.org/index.php?project=SlicerStable&filtercount=1&showfilters=1&field1=buildname&compare1=63&value1=LookingGlass). These build errors are why SlicerLookingGlass cannot be found in the Extensions Manager.

@jcfr has been the primary developer of [SlicerLookingGlass](https://github.com/KitwareMedical/SlicerLookingGlass) and may be able to respond about which version of Slicer was the extension last working. If he does not respond, you can write up an [issue](https://github.com/KitwareMedical/SlicerLookingGlass/issues/new) in that repo to document the state of it not working with latest Slicer.

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