Mesh._isWorldMatrixFrozen not serialized

Questions
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1

Version: git HEAD

TransformNode._isWorldMatrixFrozen is currently not serialized nor parsed for TransformNode, but it’s parsed for mesh:

But in curr codebase there is nowhere parsedMesh.freezeWorldMatrix get serialized after a quick search, so serialization will lost this config.

Also, ever considered extending this to TransformNodes?

2

Good catch, thanks for the report (and for digging into the source)!

You’re right on both counts:

  1. Mesh.Parse was reading freezeWorldMatrix but nothing on the producer side ever wrote it, so the value was always lost on a .babylon round-trip.
  2. TransformNode had no support at all even though _isWorldMatrixFrozen lives there.

Fixed in PR #18373:

  • Mesh.serialize() and TransformNode.serialize() now emit freezeWorldMatrix: true when the node is frozen.
  • TransformNode.Parse() defers the freeze via an internal waiting flag (declared, not initialized, to avoid pushing every instance past V8’s dictionary-mode threshold).
  • babylonFileLoader runs a freeze pass for transform nodes after parent wiring, before the existing mesh freeze pass.

Round-trip unit test added.