GLTFLoader: Fix missing associations #22583
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…several glTF node definitions reference the same mesh data, and the mesh data has multiple primitives.Resolve issue where association mappings are missing for meshes when several glTF node definitions reference the same mesh data, and the mesh data has multiple primitives.
Author
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@takahirox I have patched an issue here with multiple-associations, can you take a look? |
ghost
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Owner
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Merging this. Hopefully everything looks good @takahirox 🤞 |
Owner
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Thanks! |
ghost
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Resolve an issue where association mappings are missing for meshes when several glTF node definitions reference the same mesh-group, and the mesh-group has multiple primitives.
Continued from PR: #22544
Repro this issue:
Load the 2CylinderEngine gltf-sample model.
Walk the node hierarchy and check that each node/mesh has an association.
You will find several objects that do not have associations.
Explanation: Nodes that refer to the same Mesh/Group get cloned, if a Group gets cloned then the association map will not a have record of the clone and needs to be updated, in addition the child meshes of the group also get cloned and those child clones also need to be updated in the association map.
Additional fix:
As a side effect of the cloning there can be several 'source' nodes (the ones getting cloned) that have association mappings but are not actually in the node hierarchy (leaking memory in other words), this PR removes the extraneous mappings.