Originally Open on GitHub:

[https://github.com/Unity-Technologies/usd-unity-sdk/issues/353]

 
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h3. Bug Report

In USD 21.11, the type of the {{UsdPrimvarReader.varname}} input was changed from {{token}} to {{{}string{}}}, with [this|https://github.com/PixarAnimationStudios/USD/commit/ae3b8f9935be0d1beb8f40f59522233b5c2b6623] commit. Because of this, importing into Unity assets created with USD 21.11 creates objects that are simply colored instead of fully textured.

This can be easily reproduced by exporting a cube with a textured Standard Surface material from Maya 2023 (that ships with USD 21.11).

Is this a known issue ?

 
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h3. Repro steps

Textured cube using {{token}} (left) and {{string}} (right). 

Unity 2021.3.9f1.

!image-2023-03-28-11-08-26-375.png|width=674,height=382!
# Unpack attached zip file.
# Import attached {{cube_uvgrid_string.usda}} file as GameObjects.
# Switch "Materials" attribute to "Import Preview Surface".
# Reimport USD asset.
# Repeat steps 1-3 with {{cube_uvgrid_token.usda}} file.
# Notice the difference between the {{token}} (left in image) and {{string}} (right in image) imports.

Corresponding line in {{{}cube_uvgrid_token.{}}}usda file:
{code:java}
token inputs:varname.connect = </Cube/mtl/uvGridMat.inputs:texFile:varname> {code}