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

onNewMeshAdd executes repeatedly for the same mesh

Bugs

sebavan March 3, 2026, 10:21pm 7

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

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onNewMeshAdd executes repeatedly for the same mesh

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