Have you tried putting your directional light in the USDZExport ?
I’ve also tried to pull the complete scene root into the USDZ exporter. No change here. No light
by user 684154017479524352
I’m sure it’s my model.
by user 684154017479524352
cc @herbst🌵
Which iOS version are you on? There has been a lighting change (to the better) in 16.3 or .4 which looks much more reasonable, before that all AR scenes were very dark on QuickLook (bug in Safari / QuickLook)
@matmat would you be able to upload the obj with textures here? I was able to reproduce the issue with the mesh, and it’s a Unity importer bug (imported tangents contain NaN values). We can sanitize that and will report to Unity. I’d also like to look at the texture issues you mentioned.
Here are my starting data and texture. Thanks for looking at the issue. Nice that you make it possible for the light in AR to get brighter. I already had my texture set up as a test with more light. My platform is IOS.
by user 684154017479524352
Excellent, thank you.
I think I found an issue with compressed texture readback for QuickLook, looking at it right now
@herbst🌵 now it works, thank you! great job!
by user 684154017479524352
Excellent! Yes, forgot to tell you that I fixed it 
Plus reported a bug to Unity, there were actually two here (one: compressed texture readback in Needle Engine; two: Unity’s own importer producing slightly invalid data which led to broken UVs)