tinyusdz/doc/usdz_note.md

For ARKit

File format

Seems USDA(ASCII) is not supported(yet?). USDC only.

Mesh

attribute with texCoord2f[] type: Can be used as explicit texture coordinate attribute with float2[] type: Specify texture UV attribute from TexCoordReader(UsdPrimvarReader) with inputs:varname attribute.

Material/Shader

It looks USDZ tool(e.g. ARKit) only supports UsdPreviewSurface

https://graphics.pixar.com/usd/docs/UsdPreviewSurface-Proposal.html

Texture

UDIM is supported.

File format

.png, .jpg

ARKit Schema info

https://developer.apple.com/documentation/arkit/usdz_schemas_for_ar/schema_definitions_for_third-party_digital_content_creation_dcc