Not sure where to put this, but you should all check out usdzshare on twitter. I have been following him for a while now and he´s doing some cool stuff with USDZ in switht playground lately.
Basicly he has made an app in swift playground that can make the USDZ export from Shapr3d become even more realistic. More controll of the parameters and PBR materials import.
Is this the best rendering app for Ipad now?
Shapr3d should take a note (maby something similar can be implimented into shapr3d?)