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Fix Issues in neuroglancer-with-segments notebook when widget() is used. #517
Description
When executing the widget_neuroglancer_precomputed_with_segments notebook, the following errors occur only if vc.widget() is used for visualization. vc.web_app() works fine.
- 'obsColorEncoding': 'obsColors' throws the following errors related to worker threads.
- when above is commented, the meshes load but the loading overlay does not go away.
0c482b40-4ca0-4373-bdd5-cf5107cff564:10137 Uncaught TypeError: Cannot convert undefined or null to object
at Object.assign (<anonymous>)
at RPC.<anonymous> (0c482b40-4ca0-4373-bdd5-cf5107cff564:10137:14)
at RPC.target.onmessage (0c482b40-4ca0-4373-bdd5-cf5107cff564:5583:43)
0c482b40-4ca0-4373-bdd5-cf5107cff564:13515 Uncaught TypeError: Cannot read properties of undefined (reading 'add')
at onTemporaryVisibleSegmentsStateChanged (0c482b40-4ca0-4373-bdd5-cf5107cff564:13515:78)
at new SegmentationLayerState (0c482b40-4ca0-4373-bdd5-cf5107cff564:13570:9)
at new MultiscaleMeshLayer (0c482b40-4ca0-4373-bdd5-cf5107cff564:14666:9)
at RPC.<anonymous> (0c482b40-4ca0-4373-bdd5-cf5107cff564:5738:17)
at RPC.target.onmessage (0c482b40-4ca0-4373-bdd5-cf5107cff564:5583:43)
onTemporaryVisibleSegmentsStateChanged @ 0c482b40-4ca0-4373-bdd5-cf5107cff564:13512
SegmentationLayerState @ 0c482b40-4ca0-4373-bdd5-cf5107cff564:13570
MultiscaleMeshLayer @ 0c482b40-4ca0-4373-bdd5-cf5107cff564:14666
(anonymous) @ 0c482b40-4ca0-4373-bdd5-cf5107cff564:5738
RPC.target.onmessage @ 0c482b40-4ca0-4373-bdd5-cf5107cff564:5583
Worker.postMessage
invoke @ ReactNeuroglancer-BfWBfio7.js:5646
Activity
LucaMarconato commentedon Sep 14, 2026
I experienced this today when running the
invasive.ipynbexample notebook in tissue-map-tools hms-dbmi/tissue-map-tools#39 withuse_web_app=Falseandsegments=None.