Hello gchiste, Thanks for the reply! Please create a new visionOS app from xcode, replace the code in ImmersiveView with the following code, and change the preferred Default Scene Session Role to Immersive Space Application Session Role. // // ImmersiveView.swift // deviceAnchorSample // import SwiftUI import RealityKit import ARKit struct ImmersiveView: View { var body: some View { RealityView { content in Task { do { try await arkitSession.run([worldTrackingProvider]) var deviceAnchor : DeviceAnchor? while (deviceAnchor == nil || !checkDeviceAnchorValid(Transform(matrix: deviceAnchor!.originFromAnchorTransform).translation)) { deviceAnchor = worldTrackingProvider.queryDeviceAnchor(atTimestamp: CACurrentMediaTime()) } let cameraTransform = Transform(matrix: deviceAnchor!.originFromAnchorTransform) // attachmentEntity.transform.translation = cameraTransform.translation + [0, 0.05, -1] } catch { print("Error: \(error)") } } } } private func checkDeviceAnchorValid(_ translation: SIMD3<Float>) -> Bool { // device anchor's x and z should be almost zero, with y in the valid range of a human being's height print("deviceAnchor's translation:\(translation)") return abs(translation.x) < 0.1 && abs(translation.z) < 0.1 && translation.y > 0.2 && translation.y < 3 } // MARK: Private private let arkitSession = ARKitSession() private let worldTrackingProvider = WorldTrackingProvider() } #Preview { ImmersiveView() .previewLayout(.sizeThatFits) }// When running, look for logs that start with deviceAnchor's translation:.The dead loop problem cannot be reproduced stably, But it did happen more than once. Notice the jump change of the translation value, I think the main issue is that there are no callbacks or flags indicating the worldTrackingProvider is initiated. I'm on Xcode 15.2(15C500b), and visionOS 1.0 (21N305) simulator

How can we achieve this multiple window style layout inside our own app?