Follow up: Apparently, since iOS16, there is actually support for this in AR QuickLook / USDZ. The VisionPro USDZ asset on Apple.com, is using AO maps in UV2: https://www.apple.com/105/media/us/apple-vision-pro/2023/7e268c13-eb22-493d-a860-f0637bacb569/ar/apple_vision_pro_ios16.usdz The problem is that there seems to be basically zero documentation on how to author these USDZ files, so I started a thread on the OpenUSD forum to investigate: https://forum.aousd.org/t/linking-ao-texture-map-to-secondary-uv-channel-st1/446/3 Apparently, exporting USDZ with these charateristics is possible via the Maya USDZ exporter, but as far as I can see there´s no support in Blender (my preferred authoring platform). So we´re now looking to move our pipeline to Maya and test compatibility. I really hope that Apple will up their game and expose these options in an updated (and much improved) version of Reality Converter soon.