Playground: https://playground.babylonjs.com/#5N3RWK#13
Not really sure whats going on, seems like multiple issues.
Is there anything i can do in the model, or is it the exporter that needs to be fixed
GLB
USDZ
First issue sorted: bakeCurrentTransformIntoVertices
The scene gets messed up, but the export is much better.
Texture maps are still doing wierd stuff
The usdz exporter is super limited for now. It only takes in account a few PBR parameters
That being said, it should look better than that.
Adding @alexchuber who owns our serializers
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Additional question: where do you render it? Do they have an env map (IBL is required for lighting)
More progress by removing AO Textures (which were incorrectly mapped)
I’m using various Apple tools: Xcode, macOS Preview and iOS “Quick Look”
Thanks for the report and helpful debugging tips! I will have a look to see what is going on 
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This should fix the issues with transformations + texture mappings you were seeing:
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