Discuss spatial computing on Apple platforms and how to design and build an entirely new universe of apps and games for Apple Vision Pro.

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RC Pro Timeline Notification Not Received in Xcode
I'm having a heck of a time getting this to work. I'm trying to add an event notification at the end of a timeline animation to trigger something in code but I'm not receiving the notification from RC Pro. I've watched that Compose Interactive 3D Content video quite a few times now and have tried many different ways. RC Pro has the correct ID names on the notifications. I'm not a programmer at all. Just a lowly 3D artist. Here is my code... import SwiftUI import RealityKit import RealityKitContent extension Notification.Name { static let button1Pressed = Notification.Name("button1pressed") static let button2Pressed = Notification.Name("button2pressed") static let button3Pressed = Notification.Name("button3pressed") } struct MainButtons: View { @State private var transitionToNextSceneForButton1 = false @State private var transitionToNextSceneForButton2 = false @State private var transitionToNextSceneForButton3 = false @Environment(AppModel.self) var appModel @Environment(\.dismissWindow) var dismissWindow // Notification publishers for each button private let button1PressedReceived = NotificationCenter.default.publisher(for: .button1Pressed) private let button2PressedReceived = NotificationCenter.default.publisher(for: .button2Pressed) private let button3PressedReceived = NotificationCenter.default.publisher(for: .button3Pressed) var body: some View { ZStack { RealityView { content in // Load your RC Pro scene that contains the 3D buttons. if let immersiveContentEntity = try? await Entity(named: "MainButtons", in: realityKitContentBundle) { content.add(immersiveContentEntity) } } // Optionally attach a gesture if you want to debug a generic tap: .gesture( TapGesture().targetedToAnyEntity().onEnded { value in print("3D Object tapped") _ = value.entity.applyTapForBehaviors() // Do not post a test notification here—rely on RC Pro timeline events. } ) } .onAppear { dismissWindow(id: "main") // Remove any test notification posting code. } // Listen for distinct button notifications. .onReceive(button1PressedReceived) { (output) in print("Button 1 pressed notification received") transitionToNextSceneForButton1 = true } .onReceive(button2PressedReceived.receive(on: DispatchQueue.main)) { _ in print("Button 2 pressed notification received") transitionToNextSceneForButton2 = true } .onReceive(button3PressedReceived.receive(on: DispatchQueue.main)) { _ in print("Button 3 pressed notification received") transitionToNextSceneForButton3 = true } // Present next scenes for each button as needed. For example, for button 1: .fullScreenCover(isPresented: $transitionToNextSceneForButton1) { FacilityTour() .environment(appModel) } // You can add additional fullScreenCover modifiers for button 2 and 3 transitions. } }
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Digital Crown press when both immersive space and additional windows are presented
I have been experimenting with the Hello World sample app from https://developer.apple.com/documentation/visionos/world and I came across behavior that appears inconsistent with user-facing documentation describing the device controls at https://support.apple.com/en-gb/guide/apple-vision-pro/tan1e2a29e00/visionos I tried pressing simulator's "Home" button while "Objects in Orbit" immersive space was presented alongside with the main application window. According to user documentation, pressing Digital Crown should take the user directly to Home View. In my test a single press only dismissed the immersive space, I needed another press to "exit" the app and go to Home View. Is this behavior expected? I am assuming that "Home" button in the simulator behaves as if the user pressed Digital Crown on the device, I don't have access to the actual hardware.
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Apr ’25
Manipulate objects in Reality Composer Pro
The documentation at https://developer.apple.com/documentation/visionos/designing-realitykit-content-with-reality-composer-pro states: Reality Composer Pro treats your imported assets as read-only. This is a huge obstacle for me, as I need to do multiple adjustments to the scene. I somehow managed to actually import one of my assets into the scene and can manipulate it directly, but now I can't figure out how I did this. As I have to prepare further assets and would like to do this directly in Reality Composer Pro, I'm looking for a way to actually load them into the scene. Any idea how this can be done?
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Oct ’24
Synchronizing Multi-User AR Experiences on Apple Vision Pro
Hello Developers, I am currently in the initial planning stages of my bachelor thesis in computer science, where I will be developing an application in collaboration with a manufacturer of large-scale machinery. One of the core features I aim to implement is the ability for multiple Apple Vision Pro users to view the same object in augmented reality simultaneously, each from their respective positions relative to the object. I am still exploring how best to achieve this feature. My initial approach involves designating one device as the host of a "room" within the application, allowing other users to join. If I can accurately determine the relative positions of all users to the host device, it should be possible to display the AR content correctly in terms of angle, size, and location for each user. Despite my research, I haven't found much information on similar projects, and I would appreciate any insights or suggestions. Specifically, I am curious about common approaches for synchronizing AR experiences across multiple devices. Given that the Apple Vision Pro does not have a GPS sensor, I am also looking for alternative methods to precisely determine the positions of multiple devices relative to each other. Any advice or shared experiences would be greatly appreciated! Best regards, Revin
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Oct ’24
Billboard Entity with AttachmentView
Hey Everyone, Happy New Year! I wanted to see if you have seen this before. I have added an attachment to the RealityView as a child on an entity that has a Billboard component set on it. I wanted to create the effect that the attachment is offset by .5 meters from center and follows the device as you move around it. IT works great until you try click a button. The attachment moves with the billboard, but the collision box around the attachment is not following it. If I position myself perfectly it works. Video Example: https://youtu.be/4d9Vx7K8MmU // // ImmersiveView.swift // Billboard Attachment // // Created by Justin Leger on 1/3/25. // import SwiftUI import RealityKit import RealityKitContent struct ImmersiveView: View { var rootEntity = Entity() var body: some View { RealityView { content, attachments in // Add the initial RealityKit content let sphereEntity = ModelEntity(mesh: .generateSphere(radius: 0.1), materials: [SimpleMaterial(color: .red, roughness: 1, isMetallic: false)]) sphereEntity.position = [0.0, 1.0, -2.0] let controlsPivotEntity = Entity() controlsPivotEntity.components[BillboardComponent.self] = .init() // Extract the attachemnt entity and disable it before its used. if let controlsViewAttachmentEntity = attachments.entity(for: PlacedThingControls.attachmentId) { controlsViewAttachmentEntity.position.z = 0.5 controlsPivotEntity.addChild(controlsViewAttachmentEntity) sphereEntity.addChild(controlsPivotEntity) } content.add(sphereEntity) } attachments: { Attachment(id: PlacedThingControls.attachmentId) { PlacedThingControls() } } } } #Preview(immersionStyle: .mixed) { ImmersiveView() .environment(AppModel()) } struct PlacedThingControls: View { static let attachmentId = "placed-thing-3D-controls" var body: some View { VStack { HStack(spacing: 0) { Button { print("🗺️🗺️🗺️ Map selected pieces") } label: { Text("\(Image(systemName: "plus.square.dashed")) Manage Mesh Maps") .fontWeight(.semibold) .frame(maxWidth: .infinity) } .padding(.leading, 20) Spacer() Button(role: .destructive) { print("🗑️🗑️🗑️ Delete selected pieces") } label: { Label { Text("Delete") } icon: { Image(systemName: "trash") } .labelStyle(.iconOnly) } .padding(.trailing, 20) } .padding(.vertical) .frame(minWidth: 320, maxWidth: 480) } .glassBackgroundEffect() } }
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Jan ’25
RealityKit texture sampling behaviour
Hey there, I am working on an app that displays environmental data using PNG color channels to represent data ranges, which gets overlayed on a map. The sampled values aren't what I'm expecting though... for example an RGB value of 0x7f0000 (R = 0.5, G = 0, B = 0) would be seen as 0.21, 0, 0 in the shader. This basically makes it unusable if I'm trying to show scientific data... I'm half wondering if I am completely misunderstanding how sampling works in RealityKit / RealityComposerPro. Anybody have any idea why it works like this? Actual result (chart labels added in photoshop): Expected: Red > 0.1 Shader Graph
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Dec ’24
RoomPlan Framework v2 - Stairs missing
Hello Community, I'm encountering an issue with the latest iOS 17 update, specifically related to RoomPlan version-2. In iOS 16, when using RoomPlan version-1, we were able to display stairs in our app. However, after upgrading to iOS 17 and implementing RoomPlan version-2, the stairs are no longer visible. Despite thorough investigation, I couldn't find any option within the code to show or hide stairs, or any other objects for that matter. It seems like a specific issue with the update rather than a coding error on our part. Has anyone else encountered a similar problem? If so, I would greatly appreciate any insights or solutions you might have. It's crucial for our app functionality to have stairs displayed accurately, and we're currently at a loss on how to address this issue. Thank you in advance for any assistance you can provide. Best regards
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VisionOS slow image tracking and enterprise API questions
To set the stage: I made a prototype of an app for a company, the app is to be used internally right now. Prototype runs perfectly on iOS, so now I got VP to port the app to its final destination. The first thing I found out is that the image tracking on VP is useless for moving images (and that's the core of my app). Also distance at which image is lost seems to be way shorter on VP. Now I'm trying to figure out if it's possible to fix/work around it in any way and I'm wondering if Enterprise API would change anything. So: Is it possible to request Enterprise API access as a single person with basic Apple Developer subscription? I looked around the forum and only got more confused. Does QR code detection and tracking work any better than image detection, or anchor updates are the same? Does the increased "object detection" frequency affect in any way image/QR tracking, or is it (as name implies) only for object tracking? Would increasing the CPU/GPU headroom make any change to image/QR detection frequency? Is there something to disable to make anchor updates more frequent? I don't need complex models, shadows, physics, etc. Greetings Michal
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Oct ’24
VisionOS hands replacement inside an Immersive Space
Still don't understand why no one is clarifying about this Apple Video https://developer.apple.com/videos/play/wwdc2023/10111 At the end of this video, there's an incomplete tutorial about connecting a USDZ with mesh and Skeleton structure to the hand tracking system. No example project is linked, and no one is giving the community any clarification. Please can you help us to understand how to proceed?
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Mar ’25
Blender to Reality Composer Pro 2.0 to SwiftUI + RealityKit visionOS Best Practices
Hi, I'm very new to 3D and am currently porting a SwiftUI iOS app to visionOS 2.0. I saw WWDC24 feature Blender in multiple spatial videos, and have begun integrating Blender models and animations into my VisionOS app (I would also like to integrate skeletons and programmatic rigging, more on that later). I'm wondering if there are “Best Practices” for this workflow - from Blender to USD to RCP 2.0 to visionOS 2 in Xcode. I’ve cobbled together the following that has some obvious holes: I’ve been able to find some pre-rigged and pre-animated models online that can serve as a great starting point. As a reference, here is a free model from SketchFab - a simple rigged skeleton with 6 built in animations: https://sketchfab.com/3d-models/skeleton-character-low-poly-8856e0138f424d68a8e0b40e185951f6 When exporting to USD from Blender, I haven’t been able to export more than one animation per USD file. Is there a workflow to export multiple animations in a single USDC file, or is this just not possible? As a temporary workaround, here is a python script I’ve been using to loop through all Blender animations, and export a model for each animation: import bpy import os # Set the directory where you want to save the USD files output_directory = “/path/to/export” # Ensure the directory exists if not os.path.exists(output_directory): os.makedirs(output_directory) # Function to export current scene as USD def export_scene_as_usd(output_path, start_frame, end_frame): bpy.context.scene.frame_start = start_frame bpy.context.scene.frame_end = end_frame # Export the scene as a USD file bpy.ops.wm.usd_export( filepath=output_path, export_animation=True ) # Save the current scene name original_scene = bpy.context.scene.name # Iterate through each action and export it as a USD file for action in bpy.data.actions: # Create a new scene for each action bpy.context.window.scene = bpy.data.scenes[original_scene].copy() new_scene = bpy.context.scene # Link the action to all relevant objects for obj in new_scene.objects: if obj.animation_data is not None: obj.animation_data.action = action # Determine the frame range for the action start_frame, end_frame = action.frame_range # Export the scene as a USD file output_path = os.path.join(output_directory, f"{action.name}.usdc") export_scene_as_usd(output_path, int(start_frame), int(end_frame)) # Delete the temporary scene to free memory bpy.data.scenes.remove(new_scene) print("Export completed.") I have also been able to successfully export rigging armatures as a single Skeleton - each “bone” showing getting imported into Reality Composer Pro 2.0 when exporting/importing manually. I would like to have all of these animations available in a single scene to be used in a RealityView in visionOS - so I have placed all animation models in a RCP scene and created named Timeline Action animations for each, showing the correct model and hiding the rest when triggering specific animations. I apply materials/textures to each so they appear the same, using Shader Graph. Then in SwiftUI I use notifications (as shown here - https://forums.developer.apple.com/forums/thread/756978) to trigger each RCP Timeline Action animation from code. Two questions: Is there a better way than to have multiple models of the same skeleton - each with a different animation - in a scene to be able to trigger multiple animations? Or would this require recreating Blender animations using skeleton rigging and keyframes from within RCP Timelines? If I want to programmatically create custom animations and move parts of the skeleton/armatures - do I need to do this by defining custom components in RCP, using IKRig and define movement of each of the “bones” in Xcode? I’m looking for any tips/tricks/workflow from experienced engineers or 3D artists that can create a more efficient/optimized workflow using Blender, USD, RCP 2 and visionOS 2 with SwiftUI. Thanks so much, I appreciate any help! I am very excited about all the new tools that keep evolving to make spatial apps really fun to build!
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Apr ’25
USDZ file not loading on Apple Vision Pro
I'm working on a school project that allows users to open a .USDZ file (using Quick Look) on the webpage while using Apple Vision Pro to put the object in their physical envirnment, the project is deployed on Vercel. I'm testing the page with my apple vision pro, when I click open the .USDZ file, I'm seeing a triangle with an exclamation mark while it's trying to load, but it won't load. Does anybody know how to troubleshoot this issue?
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Oct ’24
Creating and Viewing Immersive Video Locally on Vision Pro
We would like to create an Immersive video and store the video file locally in Vision Pro for viewing. By Immersive video, I mean the video that is played at the end of the Vision Pro experience at the Apple Store (LeBron's dunk, Curry's 3-point shot, tightrope walk, etc.). It is unclear if a way is currently provided to view Immersive video locally. I can find some information about Spatial video on the Dev site, but I can't find any information about Immersive video. My understanding is: Spatial video: A video window appears in space and plays video with depth. Up to 4K side-by-side video can be converted to MV-HEVC format using Xcode and played back in the Photos app. Immersive video: 180VR video, but I’m not sure how it was created. Similar to Spatial video, I converted a side-by-side 180VR video to MV-HEVC format using Xcode, but it could not be played back in the Photos app as expected. Vision Pro's Photos app features an Immersive button during video playback, but this appears to be for zooming in on Spatial video to the full field of view, which seems different from Immersive video. The demo video provided by Apple is streamed from Apple TV, and there are no local files available. We are currently considering creating an app that displays different videos to each eye, but we prefer not to go this route due to licensing and distribution issues.
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Nov ’24
Create Anchor on Objects from 2D Data
We're developing a VisionOS application, where we would like to do product recognition (like food items). We have enterprise entitlements and therefore also main camera access for VisionOS. We send this live camera frames to a trained CoreML model where we will receive 2D coordinates from the model detection prediction. Now, we would like to create a 3D anchor on the detected items so it can be visible for user. The 3D anchor is going to be the class name of the detected item. How do we transform this 2D coordinate from the model prediction to a 3D anchor?
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716
Feb ’25
What causes »ARSessionDelegate is retaining X ARFrames« console warning?
Hi, since iOS 15 I've repeatedly noticed the console warning »ARSessionDelegate is retaining X ARFrames. This can lead to future camera frames being dropped« even for rather simple projects using RealityKit and ARKit. Could someone from the ARKit team please elaborate what causes this warning and what can be done to avoid it? If I remember correctly I didn't even assign an ARSessionDelegate. Thank you!
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3.3k
Feb ’25
RealityKit Subdivide
In the Discover RealityKit APIs for iOS, macOS, and visionOS presentation, there was a slide at the end highlighting new features not covered in the video. One of them was surface subdivision, but I have not been able to find any documentation or APIs that support this feature. Does anyone have any further details or how this works in RealityKit?
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937
Oct ’24
Reoccurring World Tracking / Scene Exceeded Limit Error
Hi, We’ve been successfully using the RoomPlan API in our application for over two years. Recently, however, users have reported encountering persistent capture errors during their sessions. Specifically, the errors observed are: CaptureError.worldTrackingFailure CaptureError.exceedSceneSizeLimit What we have observed: Persistent Errors: The errors continue to occur even after initiating new capture sessions. Normal Usage: Our implementation adheres to typical usage patterns of the RoomPlan API without exceeding any documented room size limits. Limited Feature Usage: We are not utilizing the WorldTracking feature for the StructureBuilder functionality to stitch rooms together. Potential State Caching: Given that these errors persist across sessions, we suspect that there might be memory or state cached between sessions that is not being cleared, particularly since we are not taking advantage of StructureBuilder. Request: Could you please advise if there is any internal caching or memory retention between capture sessions that might lead to these errors? Additionally, we would appreciate guidance on how to clear or manage this state when the StructureBuilder feature is not in use. Here is a generalised version of our capture session initialization code to help diagnose the issue. struct RoomARCaptureView: UIViewRepresentable { typealias Handler = (CapturedRoom, Error?) -> Void @Binding var stop: Bool @Binding var done: Bool let completion: Handler? func makeUIView(context: Self.Context) -> RoomCaptureView { let view = RoomCaptureView(frame: .zero) view.delegate = context.coordinator view.captureSession.run(configuration: .init()) return view } func updateUIView(_ uiView: RoomCaptureView, context: Self.Context) { if stop { // Stop the session only once, multiple times causes issues with the final presentation uiView.captureSession.stop() stop = false done = true } } static func dismantleUIView(_ uiView: RoomCaptureView, coordinator: Self.Coordinator) { uiView.captureSession.stop() } func makeCoordinator() -> ARViewCoordinator { ARViewCoordinator(completion) } @objc(ARViewCoordinator) class ARViewCoordinator: NSObject, RoomCaptureViewDelegate { var completion: Handler? public required init?(coder: NSCoder) {} public func encode(with coder: NSCoder) {} public init(_ completion: Handler?) { super.init() self.completion = completion } public func captureView(shouldPresent roomDataForProcessing: CapturedRoomData, error: (Error)?) -> Bool { return true } public func captureView(didPresent processedResult: CapturedRoom, error: (Error)?) { completion?(processedResult, error) } } } Thank you for your assistance.
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Mar ’25
Does Apple Spatial Audio Format documentation exist
The WWDC25 video and notes titled “Learn About Apple Immersive Video Technologies” introduced the Apple Spatial Audio Format (ASAF) and codec (APAC). However, despite references throughout on using immersive video, there is scant information on ASAF/APAC (including no code examples and no framework references), and I’ve found no documentation in Apple’s APIs/Frameworks about its implementation and use months on. I want to leverage ambisonic audio in my app. I don’t want to write a custom AU if APAC will be opened up to developers. If you read the notes below along with the iPhone 17 advertising (“Video is captured with Spatial Audio for immersive listening”), it sounds like this is very much a live feature in iOS26. Anyone know the state of play? I’m across how the PHASE engine works, which is unrelated to what I’m asking about here. Original quote from video referenced above: “ASAF enables truly externalized audio experiences by ensuring acoustic cues are used to render the audio. It’s composed of new metadata coupled with linear PCM, and a powerful new spatial renderer that’s built into Apple platforms. It produces high resolution Spatial Audio through numerous point sources and high resolution sound scenes, or higher order ambisonics.” ”ASAF is carried inside of broadcast Wave files with linear PCM signals and metadata. You typically use ASAF in production, and to stream ASAF audio, you will need to encode that audio as an mp4 APAC file.” ”APAC efficiently distributes ASAF, and APAC is required for any Apple immersive video experience. APAC playback is available on all Apple platforms except watchOS, and supports Channels, Objects, Higher Order Ambisonics, Dialogue, Binaural audio, interactive elements, as well as provisioning for extendable metadata.”
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16h
Issue with tracking multiple images using ARKit on VisionOS
We are using the ARKit image tracking feature on visionOS 2.0 with three pre-registered images. The image tracking works, but only one image is actively tracked at a time. When more than one target image is visible to the camera, it has difficulty detecting and tracking the other images. Is this the expected behavior in visionOS, or is there something we need to do to resolve this issue?
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Mar ’25