Here is the test code run in a macOS app (MacOS 15 Beta3). If the excutable path does not contain Chinese character, every thing go as We expect. Otherwise(simply place excutable in a Chinese named directory) , the MTLLibrary We made by newLibraryWithSource: function contains no functions, We just got logs: "Library contains the following functions: {}" "Function 'squareKernel' not found." Note: macOS 14 works fine id<MTLDevice> device = MTLCreateSystemDefaultDevice(); if (!device) { NSLog(@"not support Metal."); } NSString *shaderSource = @ "#include <metal_stdlib>\n" "using namespace metal;\n" "kernel void squareKernel(device float* data [[buffer(0)]], uint gid [[thread_position_in_grid]]) {\n" " data[gid] *= data[gid];\n" "}"; MTLCompileOptions *options = [[MTLCompileOptions alloc] init]; options.languageVersion = MTLLanguageVersion2_0; NSError *error = nil; id<MTLLibrary> library = [device newLibraryWithSource:shaderSource options:options error:&error]; if (error) { NSLog(@"New MTLLibrary error: %@", error); } NSArray<NSString *> *functionNames = [library functionNames]; NSLog(@"Library contains the following functions: %@", functionNames); id<MTLFunction> computeShaderFunction = [library newFunctionWithName:@"squareKernel"]; if (computeShaderFunction) { NSLog(@"Found function 'squareKernel'."); NSError *pipelineError = nil; id<MTLComputePipelineState> pipelineState = [device newComputePipelineStateWithFunction:computeShaderFunction error:&pipelineError]; if (pipelineError) { NSLog(@"Create pipeline state error: %@", pipelineError); } NSLog(@"Create pipeline state succeed!"); } else { NSLog(@"Function 'squareKernel' not found."); }

Does anyone know why the following call fails? CGPDFOperatorTableSetCallback(operatorTable, "ID", &callback); The PDF specification seems to indicate that ID is an operator? BTW what is the proper topic/subtopic for questions about Quartz? Wasn't sure what topic on the new forums to post this under.

Dear Apple Developer Support, I have a question regarding the Background Assets feature for a game we are planning to release on the App Store. Specifically, I would like to understand the user experience during the initial installation process. If our game utilizes the Background Assets feature and we have essential assets specified in the BAExtension, will the end user need to wait for these essential assets to be fully downloaded before they can open the game after installing it from the App Store? Additionally, during this download process, will there be any indication of the essential assets' download status on the App Store or on the home screen icon of the game? Your guidance on how this process is managed and what the user can expect would be greatly appreciated. Thank you for your assistance.

I have a plane that is stereoscopic so represents to the user depth that is beyond the plane. I would like to have the options to render the depth buffer for the pixels or to not render any information into the depth for the plane. I cannot see any option in Shader Graph Material to affect the depth buffer during render. I also cannot see any way in RealityKit to not render to the depth buffer for an entity. I'm open to any suggestions.

Hi, I’m looking for a way to keep some custom buttons in SpriteKit the same physical size (inches) accross iOS devices (or only slightly vary their size so they’re not humongous on large screens). How do I get PPI in Swift? (cannot be library code which doesn’t compile in Swift Playgrounds). I will use PPI for determining total screen size which I will use to determine how to adjust the button sizes while also respecting some physical desirable dimensions for the buttons. I'm only asking for handheld (same distance from eyes to screen) use, so I don't care about Apple TV (longer distance).

Hello, is it possible to take a screenshot of the whole immersive view, including or excluding SwiftUI components? ARView has a snapshot method for this, but it seems there's no equivalent for RealityView. I've tried to use ImageRenderer on a parent of RealityView, but I'm only getting plain white bitmap so far. Thanks in advance, Rlu

I recently found the tinted app icon feature, which I love I think it is such a cool idea. The execution on the other hand is slightly flawed, I tried to set my apps to the light pink color. The feature work well in the editing area but once I clicked done the apps went from a light pink to dark red. I have tried this multiple times with multiple colors and the issues are consistent through all colors except when using the color dropper.

Calling SKAction.follow(..) causes my SKSpriteNode to rotate 90 degrees CW and not stay horizontal as it follows my UIBezierPath? I have this code (within my GameViewController Class) which implements the following of a SKSpriteNode along a UIBezierPath. ===== Please note that a brilliant contributor solved the above challenge by creating a new Class, e.g., class NewClass: NSObject. Nevertheless, I need the solution to appear in an extension of my GameViewController ===== func createTrainPath() { trackRect = CGRect(x: tracksPosX - tracksWidth/2, y: tracksPosY, width: tracksWidth, height: tracksHeight) trainPath = UIBezierPath(ovalIn: trackRect) } // createTrainPath func startFollowTrainPath() { var trainAction = SKAction.follow( trainPath.cgPath, asOffset: false, orientToPath: true, speed: theSpeed) trainAction = SKAction.repeatForever(trainAction) myTrain.run(trainAction, withKey: runTrainKey) } // startFollowTrainPath func stopFollowTrainPath() { guard myTrain == nil else { myTrain.removeAction(forKey: runTrainKey) savedTrainPosition = getPositionFor(myTrain, orPath: trainPath) return } } // stopFollowTrainPath

So I am trying to create a certain amount of spheres in a SceneKit scene based on the number of objects in a list. So I think I would put an addChild in a for loop, but how would I assign them all to the same type of model? Especially because sometimes the list will be empty, so the model would not need to show up at all.

The transparency in reality kit is not rendered properly from specific ordinal axes. It seems like it is a depth sorting issue where it is rejecting some transparent surfaces when it should not. Some view directions relative to specific ordinal axes are fine. I have not narrowed down which specific axes is the problem. This is true across particle systems and/or meshes. It is very easy to replicate this issues using multiple transparent meshes or particle systems. In the above gif you can see the problem in multiple instances, the fire and snow particles are sorted behind the terrain, which has transparency since it is a procedural blend of grass, rock, and ice, but it is correctly sorted in front of the opaque materials such the rocks and wood. In the above gif, it is two back to back grid meshes (since dual sided rendering is not supported) that have a custom surface shader to animate the mesh in a wave and also apply transperency. You can see in the distance, where the transparency seems to be rendered/overlapped correctely, but at the overlap approaches the screen (and crosses an ordinal axes) it renders black for the transparent portion of the surface, when the green of the mesh that is behind should be rendered. This is a blocking problem for the development of this demo.

I'm using the Apple Unity Plugins to use Game Center to authenticate Playfab accounts for my game and when I test this on testflight, everything works fine for me and the people I've tested with, however, when I send the build to review, they are getting GameKitException 37 which states "This game is not listed in a marketplace that supports Game Center" and upon further research I found this page https://developer.apple.com/documentation/gamekit/gkerror/code/appunlisted which I'm assuming is the same thing. This seems to suggest that I need my app to be listed on the App Store which is strange because this has created a what comes first, the chicken or the egg problem. I need to pass review to get the game listed in the App Store and they can't test the game because accounts cannot be authenticated with Game Center which apparently needs to be listed on the App Store. So far, I can't find the reason why this doesn't happen on testflight and only happens when I send it to review. I opened a ticket to Apple Developer Support and haven't recieved a response. I asked app review about it and they replied "Hello, Thank you for your response. Since all apps must pass App Review before they can be approved, it should not be necessary to have a "store page". We look forward to reviewing your app once all issues have been addressed and the new build has been received and queued for review. Best regards, App Review" Which doesn't really help me. I am quite pressed for time and I really need assistance in resolving this issue which I cannot replicate. Has anyone encountered this issue or know how to solve it?

I am trying to simulate a pinball game and I want to use PhysicsBody & PhysicsMotion to achieve that. I tuned the parameters around in PhysicsBodyComponent, but the result is not quite ideal for now. Imagine a fully inflated basketball bouncing high off the ground (ground vs basketball). I assign PhysicsBodyComponent and CollisionComponent to both basketball and the ground. For basket ball, I set it as: dynamic mode mass 1, inertia .one Material.Restitution 1 Angular Damping and Linear Damping to 0 AddForce to make the basketball move to hit the ground For ground, I set it as: static mode mass 1, inertia .zero Material.Restitution 1 Angular Damping and Linear Damping to 0 However, when the basket ball hit the ground, it isn't that bouncy, the basketball behaves like hitting to a cotton and the linear speed just dumps fast. Wonder how I could achieve the bouncing effect like real basketball vs ground.

Hi, I am initializing a SCNNode from a OBJ file. Let's suppose the object is a sphere, and its pivot after loading it from the OBJ file is the bottom of the sphere (where it would rest on the floor). Its default position is the zero vector. However, I must change the pivot to the center of the sphere. After doing so (based on its bbox), since the position is still the zero vector, does that mean that the object was translated so that the new pivot lies at (0,0,0)? Or should set its position to (0,0,0), which will now be based on the new pivot? To test whether this is needed, I am using a separate button to change the node's position to (0,0,0) after changing its pivot, but I do not see any change visually, which leads me to believe that after changing the pivot, the object is automatically moved to (0,0,0) based on its new pivot. This is probably done faster than the scene renders which is why I do not notice any difference between the two methods. I cannot tell which of the two is correct, meaning that I do no know whether I should set the position again to (0,0,0) after changing the pivot or not. Right now it seems like it makes no difference. Any thoughts?

I have been trying to replicate the entity transform functionality present in the magnificent app Museum That Never Was (https://apps.apple.com/us/app/the-museum-that-never-was/id6477230794) -- it allows you to simultaneously rotate, magnify and translate the entity, using gestures with both hands (as opposed to normal DragGesture() which is a one-handed gesture). I am able to rotate & magnify simultaneously but translating via drag does not activate while doing two-handed gestures. Any ideas? My setup is something like so: Gestures: var drag: some Gesture { DragGesture() .targetedToEntity(where: QueryPredicate<Entity>.has(MyComponent.self)) .onChanged { value in gestureTranslation = value.convert(value.translation3D, from: .local, to: .scene) } .onEnded { value in itemTranslation += gestureTranslation gestureTranslation = .init() } } var rotate: some Gesture { RotateGesture3D() .targetedToEntity(where: QueryPredicate<Entity>.has(MyComponent.self)) .onChanged { value in gestureRotation = simd_quatf(value.rotation.quaternion).inverse } .onEnded { value in itemRotation = gestureRotation * itemRotation gestureRotation = .identity } } var magnify: some Gesture { MagnifyGesture() .targetedToEntity(where: QueryPredicate<Entity>.has(MyComponent.self)) .onChanged { value in gestureScale = Float(value.magnification) } .onEnded { value in itemScale *= gestureScale gestureScale = 1.0 } } RealityView modifiiers: .simultaneousGesture(drag) .simultaneousGesture(rotate) .simultaneousGesture(magnify) RealityView update block: entity.position = itemTranslation + gestureTranslation + exhibitDefaultPosition entity.orientation = gestureRotation * itemRotation entity.scaleAll(itemScale * gestureScale)

I'm trying to create a MTLFXTemporalScaler as follows (this is adapted from the sample code): func updateTemporalScaler() { let desc = MTLFXTemporalScalerDescriptor() desc.inputWidth = renderTarget.renderSize.width desc.inputHeight = renderTarget.renderSize.height desc.outputWidth = renderTarget.windowSize.width desc.outputHeight = renderTarget.windowSize.height desc.colorTextureFormat = .bgra8Unorm desc.depthTextureFormat = .depth32Float desc.motionTextureFormat = .rg16Float desc.outputTextureFormat = .bgra8Unorm guard let temporalScaler = desc.makeTemporalScaler(device: device) else { fatalError("The temporal scaler effect is not usable!") } temporalScaler.motionVectorScaleX = Float(renderTarget.renderSize.width) temporalScaler.motionVectorScaleY = Float(renderTarget.renderSize.height) mfxTemporalScaler = temporalScaler } I'm getting the following error the 3rd time the code is called: /AppleInternal/Library/BuildRoots/91a344b1-f985-11ee-b563-fe8bc7981bff/Library/Caches/com.apple.xbs/Sources/MetalPerformanceShadersGraph/mpsgraph/MetalPerformanceShadersGraph/Runtimes/MPSRuntime/Operations/RegionOps/ANRegion.mm:855: failed assertion `ANE intermediate buffer handle not same!' When I copy the code out to a playground, it succeeds when called with the same sequence of descriptors. Does this seem like a bug with MTLFXTemporalScaler?

使用xib方式的scnview 加载点云图3D模型，在苹果12上无法展示，在苹果13上可以正常显示.以下为报错信息：Execution of the command buffer was aborted due to an error during execution. Discarded (victim of GPU error/recovery) (00000005:kIOGPUCommandBufferCallbackErrorInnocentVictim) 2024-07-10 11:01:22.403196+0800 不愁物联网[26648:1375452] Execution of the command buffer was aborted due to an error during execution. Discarded (victim of GPU error/recovery) (00000005:kIOGPUCommandBufferCallbackErrorInnocentVictim) 2024-07-10 11:01:22.403458+0800 不愁物联网[26648:1375452] [SceneKit] Error: Resource command buffer execution failed with status 5, error: Error Domain=MTLCommandBufferErrorDomain Code=1 "Discarded (victim of GPU error/recovery) (00000005:kIOGPUCommandBufferCallbackErrorInnocentVictim)" UserInfo={NSLocalizedDescription=Discarded (victim of GPU error/recovery) (00000005:kIOGPUCommandBufferCallbackErrorInnocentVictim)} ( ) 2024-07-10 11:01:22.403539+0800 不愁物联网[26648:1375452] Execution of the command buffer was aborted due to an error during execution. Caused GPU Address Fault Error (0000000b:kIOGPUCommandBufferCallbackErrorPageFault) 2024-07-10 11:01:22.403556+0800 不愁物联网[26648:1375452] Execution of the command buffer was aborted due to an error during execution. Caused GPU Address Fault Error (0000000b:kIOGPUCommandBufferCallbackErrorPageFault) 2024-07-10 11:01:22.403586+0800 不愁物联网[26648:1375452] [SceneKit] Error: Main command buffer execution failed with status 5, error: Error Domain=MTLCommandBufferErrorDomain Code=3 "Caused GPU Address Fault Error (0000000b:kIOGPUCommandBufferCallbackErrorPageFault)" UserInfo={NSLocalizedDescription=Caused GPU Address Fault Error (0000000b:kIOGPUCommandBufferCallbackErrorPageFault)} ( )

Hi All, I am using RealityKit along with ARKit and Swift UI to develop an app where I am augmenting a usdz model of a complex geometry like that of a car. I have some other usdz files with a simple plane geometry having the material properties embedded within them which also i am loading as model entities. I want to traverse through my car usdz file such that i can pick the material from simple usdz file and apply it to the car as car paint. To do this i know the name of the mesh holding the car paint as well as the name of the material applied. I have tried to traverse through the usdz files using both RealityKit and SceneKit but I am not successful to reach to the lowest mesh and copy the material properties to it. With RealityKit, I have tried to get the instance data using modelEntity as follows :- "sourceModel?.model?.mesh.contents.instances". But this returns instance id, model name and transform only. Any help will be highly appreciated. Thank You

Is MTKView intentionally unavailable on visionOS or is this an issue with the current beta?

Hello, First of all, I understand that GKVoiceChat has been deprecated and replaced by shareplay but for my situation, it does not seem useful as I will be matching with the random players hence I can not utilise the Facetime(Shareplay) capability. I have set up a voice chat function using the GKVoiceChat object, my game connects with another player successfully but the voice chat does not work for some reason. The code snippet below is how I implemented it with the help of the tutorial from : apple (Start Voice chat between players) class OnlineGame { var voiceChat: GKVoiceChat? = nil ... // When online game succesfully connected and game view loaded self.startVoiceChat() func startVoiceChat() { // Handle an unknown, connected, or disconnected player state. /// - Tag:voiceChatChangeHandler /// if voiceChat == nil { // Create the voice chat object. voiceChat = myMatch?.voiceChat(withName: "Gamesession") } let voiceChatChangeHandler = { (player: GKPlayer, state: GKVoiceChat.PlayerState) -> Void in switch state { case GKVoiceChat.PlayerState.connected: self.voicechatstate = 1 case GKVoiceChat.PlayerState.disconnected: self.voicechatstate = 2 case GKVoiceChat.PlayerState.speaking: self.voicechatstate = 3 case GKVoiceChat.PlayerState.silent: self.voicechatstate = 4 case GKVoiceChat.PlayerState.connecting: self.voicechatstate = 5 @unknown default: print("Player unknown state.") } } // Exit early if the app can't start a voice chat session. guard let voiceChat = voiceChat else { return } // Handle an unknown, connected, or disconnected player state. voiceChat.playerVoiceChatStateDidChangeHandler = voiceChatChangeHandler // Set the audio volume. // Activate the shared audio session. do { let audioSession = AVAudioSession.sharedInstance() try audioSession.setCategory(AVAudioSession.Category.playAndRecord, mode: AVAudioSession.Mode.gameChat, options: AVAudioSession.CategoryOptions.allowBluetooth) try audioSession.setActive(true, options: []) } catch { print("ERROR: \(error.localizedDescription).") } voiceChat.volume = 0.8 voiceChat.start() voiceChat.isActive = true } } Thats my implementation of it and hope it explains my issue. Thanks for your assistance in advance!.

Currently, it is not possible to achieve the occlusion effect of the model through depth reading and writing and rendering order, even in the vision 2.0 beta version, this goal cannot be achieved