Scenario: building with old shopfront to be renewed, we have a visual of new concept. Is there an app that can give us the coordinates in line with the plane of the front of the building so we can map the visual on and it alter perspective as you walk around as it ‘sticks’ to front of real building please? Gif attached is visual concept but showing historic pic

I have an app idea that would map an OLD photo onto the front of the same existing building. The underlying work has already been done see https://lowestoftoldandnow.org/full/strolleast#45 but obviously you would have to accurately record 4 points in 3d space but also the user of the app would have to take these points (given to them by the app) and map them back onto the real world with the same accuracy. If the photo was partly on the next door building it would not work. I am beginning to think that the technology is not there yet :-(

Why high-level RealityKit's APIs are only available on visionOS? RealityView & Model3D only to name some. On other platforms currently, the only way to deploy RealityKit & or ARKit, is by using either UIKit or UIKit's integration with SwiftUI (UIViewRepresentable). Are these newer APIs coming to other platforms as well?

So I have a RealityView with an Entity (from my bundle) being rendered in it like so: struct ImmersiveView: View { var body: some View { RealityView { content in // Add the initial RealityKit content if let entity = try? await Entity(named: "MyContent", in: realityKitContentBundle) { content.add(entity) } } } } Is it possible to programatically transform the entity? Specifically I want to (1) translate it horizontally in space, eg 1m to the right, and (2) rotate it 90°. I've been looking through the docs and haven't found the way to do this, but I fear I'm not too comfortable with Apple docs quite yet. Thanks in advance!

i do not really know how this works but hi I am Philemon. for a school assignment I need to program a app I have 2 years for this and it is for people that are interested in coding. I want to make a iOS app that can make 3d models from pictures (photogrammetry) and I know that there are already apps for this but I want to code this myself. I have a little bit of experience coding c# in unity but I really don't know where to start can someone help me? and I know that apple has reality kit but I want that people without a LiDAR Scanner can use this too. so where do I start witch language do I need to learn? every comment is welcome!!! kind regards Philemon

My application uses ARKit to capture faces in real time, there are two occasional crashes during use, I can not reproduce it, the following is the crash stack, These are all system API calls. I have no clue, any suggestions to fix it? Thank you so much! Additional information： BUG IN CLIENT OF LIBPLATFORM: Trying to recursively lock an os_unfair_lock the first kind： EXC_BREAKPOINT 0x00000001f6d2d20c 0 libsystem_platform.dylib _os_unfair_lock_recursive_abort + 36 1 libsystem_platform.dylib _os_unfair_lock_lock_slow + 284 2 SceneKit C3DTransactionGetStack + 160 3 SceneKit _commitImplicitTransaction + 36 4 CoreFoundation CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 36 5 CoreFoundation __CFRunLoopDoObservers + 548 6 CoreFoundation __CFRunLoopRun + 1028 7 CoreFoundation CFRunLoopRunSpecific + 608 8 Foundation -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212 9 Foundation -[NSRunLoop(NSRunLoop) run] + 64 10 UIKitCore __66-[UIViewInProcessAnimationManager startAdvancingAnimationManager:]_block_invoke_7 + 108 11 Foundation NSThread__start + 732 12 libsystem_pthread.dylib _pthread_start + 136 13 libsystem_pthread.dylib thread_start + 8 the second kind： 已崩溃：com.apple.arkit.ardisplaylink.0x28083bd80 EXC_BREAKPOINT 0x00000001fe43920c 0 libsystem_platform.dylib _os_unfair_lock_recursive_abort + 36 1 libsystem_platform.dylib _os_unfair_lock_lock_slow + 284 2 SceneKit C3DTransactionGetStack + 160 3 SceneKit _commitImplicitTransaction + 36 4 CoreFoundation CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 36 5 CoreFoundation __CFRunLoopDoObservers + 548 6 CoreFoundation __CFRunLoopRun + 1028 7 CoreFoundation CFRunLoopRunSpecific + 608 8 CoreFoundation CFRunLoopRun + 64 9 ARKitCore -[ARRunLoop _startThread] + 616 10 Foundation NSThread__start + 732 11 libsystem_pthread.dylib _pthread_start + 136 12 libsystem_pthread.dylib thread_start + 8

I want to have realtime image anchor tracking together with RoomPlan. But it's frustrating to not seeing any thing that can support this. Because it is useful to have interactive things in the scanned room. Ideally it should be running the same time, but if not possible, how do you align the two tracking space if running RoomPlan and then ARKit image tracking? sounds like headache

Hello, I've noticed that when I have my ARSession run the sceneReconstruction provider and the world tracking provider at the same time, I receive no scene reconstruction mesh updates. My catch closure doesn't receive any errors, it just doesn't send anything to the async list. If I run just the scene reconstruction provider by itself, then I do get mesh updates. Is this a bug? Is it expected that it's not possible to do this? Thank you

I want to set camera exposure to a lower value to attenuate motion blur, how to? background: I'm making an app to capture video for gaussian splatting. less exposure, less blurry

I'm trying to import the USDZ file of a model with multiple textures attached to each part of the model. When I preview the file by double-clicking on the USDZ, it views fine. However, when I import it into Reality Composer Pro, it only shows the pink striped model. I also get the message - "Multiple root level objects exist for HU_EVO_SPY-8.usdc". There are so many components of the model that binding each texture to each component will be very difficult to do manually. How can I fix the file such that when I import to Reality Composer Pro, textures are attached to the model?

Hi, I'm prototyping a visionOS app for which I'm trying to create the following behavior in mixed immersive space: users pinch and drag to position a model entity in the real world starting from the ray-cast of the pinch, meaning that the initial position should be on a MeshAnchor from scene reconstruction (I got that working, even though it's less precise than I expected) once the model entity is positioned, I want to anchor this to the world so that it will always stays there no matter what, from what I understand I need to create and add a WorldAnchor to a WorldTrackingProvider for that after positioning the model entity, users should be able to pinch and drag the entity to change its position and have that be persisted from then onwards It's not clear to me what the relationship between AnchorEntity(world:) and WorldAnchor is (looks like AnchorEntity(anchor:) isn't available in visionOS). What is the recommended way to keep these together? Afterwards, what is the recommended way to covert coordinate spaces between repositioned scene coordinate space and the anchor entity hierarchy coordinate space? I tried a DragGesture on the model entity and convert the translation to the scene, that works only when the scene origin hasn't changed. After it has changed, the translation is using the wrong coordinate space. Thanks for the help! Geert

When trying to run my app with .windowStyle(.volumetric) for vision OS, this error is returning: Fatal error: Your app was given a scene with session role UISceneSessionRole(_rawValue: UIWindowSceneSessionRoleApplication) but no scenes declared in your App body match this scroll.

Hi, Please forgive me if i am asking a basic question. Because after my R&D I didn't see how can I build a solution where user can scan a QR code hanging on a specific wall at a specific fixed position. So when workers scan qr code from their iOS device they could see all the wirings, pipeline e.t.c. It would be really helpful If someone can let me know if its possible with ARKit and how.

Hi, What are the limitations and capabilities of visionOS? I cannot find answers to the questions I have. Let's say you have some USDZ files stored in a cloud service, there are so many of them that the app would be huge if you put them in assets. You want to fetch the one you are interested in and show it while an app is running. Is it possible to load USDZ files at runtime from the network? Is there a limit to how many objects can be visible at once? Let's say I am in an open space, with no walls. I want to place 100 3D objects somewhere in space. Is it possible? What if I placed 500, 1000? Is there a way to save the anchor point of the object? I want to open the app again and have an object in the same place I left it. I would like to arrange my space and have objects always in the same spots. How does the OS behave if objects are in different rooms? Is it possible to walk around, visit different rooms, and have objects anchored there? Would it behave like real objects? Is it possible to color a plane? Let's say there is a wall and it's black. I want this wall to be orange. Is it possible?

When i call queryDeviceAnchor in my Billboard system I get transform updates but I'm unsure how to process them (similar to the Diorama sample app). Is it a bug that I recieve these updates? The documentation says that ARKit data is only provided in a full space so I would expect this not to work at all. But if this is the case, why am I getting deviceAnchor values in this situation?

I have a main app window that presents an Immersive style in Mixed Reality. I am trying to determine the anchor/position of this glass window in the 3D space and place a Sphere entity right next to it. The goal is to ensure that if the user moves the window, the Sphere entity remains attached to it. Does anyone have insights on how to achieve this? The below code snippet provides the position of the device, and I have positioned it 0.5 meters away from the z-axis. However, my objective is to obtain the position of the glass window and anchor the sphere to it. Any guidance on achieving this would be appreciated. import RealityKit import RealityKitContent import ARKit struct ImmersiveView: View { let visionProPose = VisionProPose() var body: some View { RealityView { content in Task { await visionProPose.runArSession() } // Add the initial RealityKit content if let scene = try? await Entity(named: "Immersive", in: realityKitContentBundle) { content.add(scene) } } update: { content in if let scene = content.entities.first { if let sphere = scene.findEntity(named: "Sphere") as? ModelEntity { Task { let transfrom = await visionProPose.getTransform() sphere.position = [Float((transfrom?.columns.3.x)!), Float((transfrom?.columns.3.y)!), Float((transfrom?.columns.3.z)!) - 1 ] } } } } } } @Observable class VisionProPose { let session = ARKitSession() let worldTracking = WorldTrackingProvider() func runArSession() async { Task { try? await session.run([worldTracking]) } } func getTransform() async -> simd_float4x4? { guard let deviceAnchor = worldTracking.queryDeviceAnchor(atTimestamp: 1) else { return nil } let transform = deviceAnchor.originFromAnchorTransform return transform } }

Hello, I want to be able to tap on a previously-placed ModelEntity box and add a dot or a text at that location on the box (kind of like I'm adding an annotation on the box) I have something like this, but not sure how I should do it correctly: class MyARView: ARView { // ... private func didTap(_ gestureRecognizer: UITapGestureRecognizer) { let pos = gestureRecognizer.location(in: self) if !didPlaceCube { placeCube(pos) return } let hitTestResult = self.hitTest(pos) guard let firstResult = hitTestResult.first else { return} let entity = firstResult.entity let textEntity = ModelEntity(mesh: .generateText("Hello there", extrusionDepth: 0.4, font: .boldSystemFont(ofSize: 0.05), containerFrame: .zero, alignment: .center, lineBreakMode: .byWordWrapping)) textEntity.setPosition(entity.position + firstResult.position, relativeTo: entity) entity.addChild(textEntity) } // ... }

I am using the room plan api to implement the function of multiple space merging, but I found that after performing multiple space merging, the generated json would miss some of the newly added areas, but the usd file and plist file were complete.Does anyone have this problem? Look forward to official support this is my code: public func mergeScan(_ data:String,_ scanName:String,_ directoryName:String){ var capturedRoomArray: [CapturedRoom] = [] //解析主结构 let jsonURL = getRootURL().appending(path: "/\(directoryName)/\(scanName)/scan.json") guard let mainStructureRoom = try?loadCapturedRoom(from: jsonURL) else { return } capturedRoomArray.append(mainStructureRoom) // 添加子结构 if let subStructureRoom = try? loadCapturedRoom(from: data) { os_log("loadCapturedRoom string data success: %@", type: .error, String(describing: data)) capturedRoomArray.append(subStructureRoom) } os_log("merge scan capturedRoomArray: %@", type: .error, String(describing: capturedRoomArray.count)) //合并 Task { do { finalStructureResults = try await structureBuilder.capturedStructure(from: capturedRoomArray) }catch { print("Merging Error:\(error.localizedDescription)") return } do{ //保存 //导出json guard let finalStructureResults else { return } try exportJson(from: finalStructureResults, to: jsonURL) //导出usd let meshDestinationURL = jsonURL.deletingPathExtension().appendingPathExtension("usdz") //导出plist let metadataDestinationURL = jsonURL.deletingPathExtension().appendingPathExtension("plist") try finalStructureResults.export(to: meshDestinationURL, metadataURL: metadataDestinationURL, exportOptions: [.mesh]) } catch { print("Merge Error:\(error.localizedDescription)") return } } } func exportJson(from capturedStructure: CapturedStructure, to url: URL) throws { let encoder = JSONEncoder() encoder.outputFormatting = [.prettyPrinted, .sortedKeys] let data = try encoder.encode(capturedStructure) try data.write(to: url) } Note: Only json is missing the content of this or the next scan, usdz and plist are complete

I am new to visionOS development, just slowly figuring out the difference in immersion styles to figure out how I want my app to behave. It seems that when you use a progressive immersive space the minimum immersion level (set via the digital crown) is not 0? Meaning, there is no way to go from mixed to full by using the Digital Crown. Even when I try to set it to 0 (such as in the Destination Video sample), it pops back up to around 30-40%, and I always see the background. Is this expected behavior, or are there some settings that allow me to change this minimum immersion level? Further, in the video 'Meet ARKit for spatial computing', it is stated that to get access to ARKit tracking data you must use a 'Full Space', not the 'Shared Space'. This wording is confusing to me. Is an ImmersiveSpace set to the .mixed (or .progressive) immersion style still a 'Full Space' (because it isn't in the shared space, with other apps)? OR, is ARKit only available in an ImmersiveSpace with the .full immersion style? Just feels like maybe 'full' is being used in two different ways here... Thanks in advance, -pj

I am trying to implement a game where the character walks on the scene mesh. I am controlling the character with a game controller. I noticed there is a character controller component in Reality Composer Pro, I am aware that when this component is added, the player cannot have a collision or a physics component. I need an example that covers adding an entity with the character controller component to the scene and then moving the character using the moveCharacter function. I was also looking at the documentation https://developer.apple.com/documentation/realitykit/entity/movecharacter(by:deltatime:relativeto:collisionhandler:) Here it is also looking for deltaTime. Where do we get the deltaTime from? does it come from a system's update function, does that also mean that the character controller needs to be moved in the update method? Thanks, Sarang