Working space error when bringing USD assets into Maya scene with an ACES colour config

[scott-wilson]

Hey all,

I'm running into an issue where I get the following message:

Could not find a UsdUVTexture shader that outputs to working color space ACES - ACEScg.. Will default to scene-linear Rec 709/sRGB conversion.

I'm not sure how the USD plugin registers the Maya scene's current config, but by the time the asset is loaded, the Maya colour settings should be pointing to our ACES 1.1 config. How do we get the USD plugin to "know" about the ACEScg colour space?