This is an example iOS app that demonstrates how to place content in a RealityKit scene.
Place virtual coffee cups in the real world by tapping. The SwiftUI app will handle preloading of 3D resources and placing them in the scene where the user taps the view.
This app is a part of a detailed guide available on my blog here: https://brendaninnis.ca/programmatically-placing-content-in-realitykit.html