When using LoadAssetContainer to load babylon scene data described in JSON format, the onNewMeshAdd for the same mesh will be executed repeatedly. The scene data in playground only contains a cube mesh. https://playground.babylonjs.com/#16O9D2 [截屏2026-01-06 18.00.25]

[image] The two triggers occur here because Babylon.js meshes are added to the scene by default during initialization. The LoadAssetContainer behavior creates the mesh and then removes it from the scene.

Working on a tentative fix: Try preventing events during babylon file parsing by sebavan · Pull Request #17623 · BabylonJS/Babylon.js · GitHub

Had to revert the fix here LoadAssetContainerAsync doesn't work for Babylon files - #4 by sebavan As it might be impactful, we ll work on a solution for it after the 9.0 release

onNewMeshAdd executes repeatedly for the same mesh

Bugs

Topic		Replies	Views
LoadAssetContainerAsync doesn't work for Babylon files Bugs	3	85	March 4, 2026
Babylon SceneLoader.ImportMeshAsync load same obj but keep all the data in the scene Questions	5	1462	July 25, 2019
Calling assetContainer.addAllToScene multiple times freezes page Bugs	1	409	December 16, 2021
Scene newMesh Observable and Mesh observables Bugs	6	1301	October 27, 2019
Why is the mesh added to the scene when it is created? Questions	4	710	February 21, 2022

onNewMeshAdd executes repeatedly for the same mesh

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