I'm looking to create an effect on iOS that tracks the user's face position with ARKit and shifts nearer/more prominent geometry in the scene around while more "distant" geometry stays fixed to the XY plane - making it look like the geometry on screen "sticks out" I've managed to implement most of this successfully, but it's not perfect when using PerspectiveCameraComponent in RealityKit because as I shift the camera (and change its field of view based on the user's distance) the backplane changes its orientation (it's always orthogonal to camera's direction). I've tried adopting ProjectiveTransformCameraComponent instead. The idea is that the camera shifts around the scene, mirroring the user's head's position, looking at (0,0,0) and the back plane is adjusted to be parallel with the X,Y plane (animation replicated in Blender below). However, I can't manage to set up ProjectiveTransformCameraComponent with an appropriate matrix or update its transform property in a RealityKit System correctly. I also tried setting many simpler projection matrices as described in a number of guides on camera projection matrices on the internet and all I get is a blank view. Does anyone have some guidance on what the projection matrix that ProjectiveTransformCameraComponent expects is meant to look like or how I would go about accomplishing my goal?

Creating an Observable class in an Xcode playground seems to cause an error. This stops me from being able to run the playground. As a demo, try creating a playground page and add: import Foundation import Observation // Doesn't seem to make a difference whether it's added or not. @Observable public class NewViewModel: Observable { var value: Int = 1 func increment() { value += 1 } } Tapping the run button logs the following error (and then it builds successfully, buy fails silently): error: Untitled Page.xcplaygroundpage:7:9: error: expansion of macro 'ObservationTracked()' did not produce a non-observing accessor var value: Int = 1 ^ Putting the cursor on @Observable and then selecting Editor > Expand Macro shows that value has been annotated with @ObservationTracked and I if I re-run the playground I can even see the @ObservationTracked generated code. Macros: import Foundation import Observation // Doesn't seem to make a difference whether it's added or not. @Observable public class NewViewModel: Observable { @ObservationTracked // original-source-range: /Users/gabriel.banfalvi/work/forums_observation/ObservationFramework.playground/Pages/Untitled Page.xcplaygroundpage:7:5-7:5 var value: Int = 1 { @storageRestrictions(initializes: _value) init(initialValue) { _value = initialValue } get { access(keyPath: \.value) return _value } set { withMutation(keyPath: \.value) { _value = newValue } } } // original-source-range: /Users/gabriel.banfalvi/work/forums_observation/ObservationFramework.playground/Pages/Untitled Page.xcplaygroundpage:7:20-7:23 func increment() { value += 1 } @ObservationIgnored private let _$observationRegistrar = Observation.ObservationRegistrar() internal nonisolated func access<Member>( keyPath: KeyPath<NewViewModel, Member> ) { _$observationRegistrar.access(self, keyPath: keyPath) } internal nonisolated func withMutation<Member, MutationResult>( keyPath: KeyPath<NewViewModel, Member>, _ mutation: () throws -> MutationResult ) rethrows -> MutationResult { try _$observationRegistrar.withMutation(of: self, keyPath: keyPath, mutation) } @ObservationIgnored private var _value: Int = 1 // original-source-range: /Users/gabriel.banfalvi/work/forums_observation/ObservationFramework.playground/Pages/Untitled Page.xcplaygroundpage:12:1-12:1 } I can't seem to be able to expand the @ObservationIgnored macros, which may or may not be related to the issue. I can't expand them in a regular Xcode app, but it doesn't lead to any problems there. Im running an iOS playground. I get this in Xcodes 15 beta 6 and 5. I get a different error in earlier versions.