This file is available in the 2019 example project for Session 609 Here is the link. Creating a Game with Reality Composer https://developer.apple.com/documentation/realitykit/creating_a_game_with_reality_compose I am able to copy the .rcproject to iPad and look at its contents using the iPad App "Reality Composer" Also I was able to create one in 2022, (so, you may want to download and use an older version of Xcode!)

Pdf for session is found here, Good Info . https://docplayer.net/132351658-What-s-new-in-gameplaykit.html Some sample Code from 2016 available in the Archives: https://developer.apple.com/library/archive/navigation/?filter=GameplayKit