Hi Hopefully someone can share some ideas on how to accomplish this. I know we can load models from realityKitContentBundle like let model = try? await Entity(named: “testModel”, in: realityKitContentBundle) But this is in the root of RealityKitContent.rkassets , if I have the models in some subfolder then I have to add the complete path like let model = try? await Entity(named: “/superModels/testModel”, in: realityKitContentBundle) What I want is to be able to search recursively in all folders for that file as I have several subfolders with different models. Any suggestion ? Thanks in advance. Guillermo

When generating large arrays of random numbers, NaNs show up. They also show up at the same indices when using the same seed, leading me to believe that this is a bug with MPSMatrixRandom's normally distributed Float32 random number distribution. Happens with both Philox and MTGP32. Is this intentional and how do I work around this? See the original post for a MWE in Swift and Julia: https://github.com/JuliaGPU/Metal.jl/issues/474

Currently looking for Metal developers to port Quake 2 RTX to Metal RT in order to give Apple Silicon Macs an amazing Pathtracing demo, This project falls under NightSightProductions who is also working on a Portal 2 with RTX Remaster. if you are interested and want to help further Mac gaming, message me here or on discord at king_vulpes

Up to now I have created multiple new SCNNodes using an instance of SCNGeometry and it was OK that they all had the same appearance. Now I want variety and when I make a copy of that instance using: let newGeo = myGeoInstance.copy() as! SCNGeometry (must be force cast because copy() -> any?) all elements are verified present. :-) Likewise: node.geometry?.replaceMaterial(at: index, with: myNewMaterial) is verified to correctly change the material(s) at the correct index(s). The only problem is the modified "teapot" is not visible, and yes I have set node.isHidden = false. Has anyone experienced this? In the old days reversing the verts was a solution. In desperation I tried that. |-(

I’m having issues getting Collision Shapes working in Reality Composer on iPadOS, or with Reality Composer Pro via Xcode on macOS? I’ve posted a video recorded through my Vision Pro showing the issue. The project i’m working on is a Dice Rolling application. The dice don’t appear to be working set as Collision Shape=Automatic, which I assume takes into account the actual silhouette of the shape. https://youtu.be/upPtQY4QOAk?si=yyx6rbSSmVkLxBLg They also don’t rest on their face when they land. Anyone experience this type of behavior and found a solution? I’m currently doing this with Reality Composer, but most likely will also be wanting to get it to work properly in Reality Composer Pro as well. Thx!

After running build.py -p Core GameKit and adding the tar balls to the Unity project in Assets/ExternalPackages no packages seem to be found when running the build using our continuous integration system. This was not the case when the project was opened in the Editor. It looks like in Apple.Core, the ApplePluginEnvironment hasn't run the OnEditorUpdate function and so the _appleUnityPackages Dictionary is empty. A change to ApplePlugInEnvironment.cs seemed to fix the issue: public static AppleNativeLibrary GetLibrary(string packageDisplayName, string appleBuildConfig, string applePlatform) { // ?FIX?: If we're not in the editor, we might not have updated the package list. if (_appleUnityPackages.Count == 0 && _updateState == UpdateState.Initializing) { OnEditorUpdate(); // UpdateState.Initializing OnEditorUpdate(); // UpdateState.Updating } I'm not sure if this is something we're doing incorrectly, the documentation for the plug-in mostly covered building the package.

Hi! I just installed GPTK2 on my new Mac , but the Terminal gave “Error:OpenSSL1.1 has been disabled.” How should I fix it?Or waiting for the GPTK2 beta4? Thanks.

https://developer.apple.com/documentation/arkit/arkit_in_ios/specifying_a_lighting_environment_in_ar_quick_look How can I disable it? or at least use a custom texture that's just black? I don't see the purpose of having the real-time environment probe that captures IBL, but always add this fake studio IBL that you can't remove...

Hi all, I have been trying to get Apple's assistive touch's snap to item to work for a unity game built using Apple's Core & Accessibility API. The switch control recognises these buttons however, eye tracking will not snap to them. The case in which it needs to snap is when an external eye tracking device is connected and utilises assistive touch & assistive touch's snap to item. All buttons in the game have a AccessibilityNode with the trait 'Button' on them & an appropriate label, which, following the documentation and comments on the developer forum, should allow them to be recognised by snap to item. This is not the case, devices (iPads and iPhones) do not recognise the buttons as a snap to target. Does anyone know why this is the case, and if this is a bug?

I have a very basic usdz file from this repo I call loadTextures() after loading the usdz via MDLAsset. Inspecting the MDLTexture object I can tell it is assigning a colorspace of linear rgb instead of srgb although the image file in the usdz is srgb. This causes the textures to ultimately render as over saturated. In the code I later convert the MDLTexture to MTLTexture via MTKTextureLoader but if I set the srgb option it seems to ignore it. This significantly impacts the usefulness of Model I/O if it can't load a simple usdz texture correctly. Am I missing something? Thanks!

I'm trying to position an Entity with inverse kinematics while dragging the handle only, but use forward kinematics (pose jointTransforms) otherwise. The System, Components, Gestures and Rig all seem to work individually. My approach is to add the IKComponent when dragging starts on the handle and removing the IKComponent it is released. The switch into IK works, but when removing the IKComponent the App crashes * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8) * frame #0: 0x00000001aa5bb188 CoreRE`(anonymous namespace)::IKComponentSolverWrapper::getSolver() + 60 frame #1: 0x00000001aa5bafb0 CoreRE`re::internal::ikParametersNodeCallback(re::Slice<re::StringID>, re::Slice<re::RigDataValue>, re::Slice<re::StringID>, re::MutableSlice<re::RigDataValue>, void*) + 48 frame #2: 0x00000001aa52d090 CoreRE`re::(anonymous namespace)::resolveEvaluationContextCallback(re::EvaluationContext&, void*) + 152 frame #3: 0x00000001aa68c024 CoreRE`re::(anonymous namespace)::$_76::__invoke(re::Slice<unsigned long>, re::(anonymous namespace)::RegisterTable&) + 1080 frame #4: 0x00000001aa678c94 CoreRE`re::EvaluationModelSingleThread::evaluate(re::EvaluationContextSlices&) + 1188 frame #5: 0x00000001aa866984 CoreRE`re::SkeletalPoseRuntimeData::executeEvaluationTree() + 136 frame #6: 0x00000001aadf37ec CoreRE`re::ecs2::SkeletalPoseComponent::calculateSkeletalPoseBufferWithRig(re::ecs2::MeshComponent*, re::ecs2::RigComponent*, re::ecs2::SkeletalPoseBufferComponent*) + 492 frame #7: 0x00000001aadf4a84 CoreRE`re::ecs2::SkeletalPoseComponentStateImpl::processPreparingComponents(re::ecs2::System::UpdateContext const&, re::ecs2::BasicComponentStateSceneData<re::ecs2::SkeletalPoseComponent>*, re::ecs2::ComponentBuckets<re::ecs2::SkeletalPoseComponent>::BucketIteration, void*) + 268 frame #8: 0x00000001aadf54b0 CoreRE`re::ecs2::SkeletalPoseSystem::update(re::ecs2::System::UpdateContext) const + 732 frame #9: 0x00000001aaed3e54 CoreRE`re::internal::Callable<re::ecs2::ECSManager::configurePhaseECSSystems(re::Scheduler::ScheduleDescriptor&, re::ecs2::ECSSystemGroup, unsigned long)::$_1, void (float)>::operator()(float&&) const + 168 frame #10: 0x00000001ab40eda4 CoreRE`re::Scheduler::executePhase(unsigned long) + 440 frame #11: 0x00000001aa6a3b74 CoreRE`re::Engine::executePhase(re::FramePhase) + 144 frame #12: 0x000000023173de9c RealitySystemSupport`RCPSharedSimulationExecuteUpdate + 64 frame #13: 0x00000002276c9820 MRUIKit`__65-[MRUISharedSimulation _doJoinWithConnectionConfiguration:error:]_block_invoke.35 + 168 frame #14: 0x00000002276c8530 MRUIKit`__addCAPreFenceHandler_block_invoke + 32 frame #15: 0x000000018af22058 QuartzCore`CA::Transaction::run_commit_handlers(CATransactionPhase) + 112 frame #16: 0x000000018aef2ad4 QuartzCore`CA::Context::commit_transaction(CA::Transaction*, double, double*) + 592 frame #17: 0x000000018af21898 QuartzCore`CA::Transaction::commit() + 652 frame #18: 0x000000018af22dac QuartzCore`CA::Transaction::flush_as_runloop_observer(bool) + 68 frame #19: 0x0000000185a26820 UIKitCore`_UIApplicationFlushCATransaction + 48 frame #20: 0x0000000184f97af0 UIKitCore`_UIUpdateSequenceRun + 76 frame #21: 0x0000000185954290 UIKitCore`schedulerStepScheduledMainSection + 168 frame #22: 0x00000001859536d8 UIKitCore`runloopSourceCallback + 80 frame #23: 0x00000001804157fc CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 frame #24: 0x0000000180415744 CoreFoundation`__CFRunLoopDoSource0 + 172 frame #25: 0x0000000180414eb0 CoreFoundation`__CFRunLoopDoSources0 + 232 frame #26: 0x000000018040f454 CoreFoundation`__CFRunLoopRun + 788 frame #27: 0x000000018040ecd4 CoreFoundation`CFRunLoopRunSpecific + 552 frame #28: 0x0000000190104b70 GraphicsServices`GSEventRunModal + 160 frame #29: 0x0000000185a27e30 UIKitCore`-[UIApplication _run] + 796 frame #30: 0x0000000185a2c058 UIKitCore`UIApplicationMain + 124 frame #31: 0x00000001d29558b4 SwiftUI`closure #1 (Swift.UnsafeMutablePointer<Swift.Optional<Swift.UnsafeMutablePointer<Swift.Int8>>>) -> Swift.Never in SwiftUI.KitRendererCommon(Swift.AnyObject.Type) -> Swift.Never + 164 frame #32: 0x00000001d29555dc SwiftUI`SwiftUI.runApp<τ_0_0 where τ_0_0: SwiftUI.App>(τ_0_0) -> Swift.Never + 84 frame #33: 0x00000001d265ecdc SwiftUI`static SwiftUI.App.main() -> () + 164 frame #34: 0x000000010303f1c4 Playground.debug.dylib`static PlaygroundApp.$main() at <compiler-generated>:0 frame #35: 0x000000010303f290 Playground.debug.dylib`main at PlaygroundApp.swift:7:8 frame #36: 0x0000000102f6d410 dyld_sim`start_sim + 20 frame #37: 0x000000010312e274 dyld`start + 2840 Is there a workaround or another way to switch between IK and FK?

I’ve been trying to run Jurassic World Evolution 2 using the Game Porting Toolkit on macOS, but the game doesn’t launch and crashes immediately. Based on the error and research, it seems the issue is related to missing support for D3D12_TILED_RESOURCES_TIER_2 in the Metal API. If this is the case, does anyone know if support for tiled resources is planned for future updates of the toolkit? Or are there any potential workarounds for bypassing this limitation?

I have an M1 Pro with a 16-core GPU. When I run a shader with 8193 threads, atomic_thread_fence is violated across the boundary between thread 8191 (the last thread in the 7th threadgroup) and 8192 (the first thread in the 9th threadgroup). I've attached the Metal and Swift files, but I'll repost the relevant kernel here. It's a function that launches N threads to iterate through a binary tree from the leaves, where the first thread to reach the parent terminates and the second one populates it with the sum of the nodes two children. // clang-format off void sum(device const int& size, device const int* __restrict__ in, device int* __restrict__ out, device atomic_int* visited, uint i [[thread_position_in_grid]]) { // clang-format on int val = in[i]; uint cur = (size + i - 1); out[cur] = val; atomic_thread_fence(mem_flags::mem_device, memory_order_seq_cst); cur = (cur - 1) / 2; int proceed = atomic_fetch_add_explicit(&visited[cur], 1, memory_order_relaxed); while (proceed == 1) { uint left = 2 * cur + 1; uint right = 2 * cur + 2; uint val_left = out[left]; uint val_right = out[right]; uint val_cur = val_left + val_right; out[cur] = val_cur; if (cur == 0) { break; } cur = (cur - 1) / 2; atomic_thread_fence(mem_flags::mem_device, memory_order_seq_cst); proceed = atomic_fetch_add_explicit(&visited[cur], 1, memory_order_relaxed); } } What I'm observing is that thread 8192 hits the atomic_fetch_add first and terminates, while thread 8191 hits it second (observes that thread 8192 had incremented it by 1) and proceeds into the loop. Thread 8191 reads out[16383] (which it populated with 8191) and out[16384] (which thread 8192 populated with 8192 prior to the atomic_thread_fence). Instead of reading 8192 from out[16384] though, it reads 0. Maybe I'm missing something but this seems like a pretty clear violation of the atomic_thread_fence which (I thought) was supposed to guarantee that the write from thread 8192 to out[16384] would be visible to any thread observing the effects of the following atomic_fetch_add. Is atomic_fetch_add not a store operation? Modifying it to an atomic_store or atomic_exchange still results in the bug. Adding another atomic_thread_fence between the atomic_fetch_add and reading of out also doesn't change anything. I only begin to observe this on grid sizes of 8193 and upwards. That's 9 threadgroups per grid, which I assume could be related to my M1 Pro GPU having 16 cores. Running the same example on an A17 Pro GPU doesn't show any of this behavior up through a tested grid size of 4194303 (2^22-1), at which point testing larger grid sizes starts to run into other issues so I can't test anything larger. Removing the atomic_thread_fences on both the M1 and A17 cause the test to fail at much smaller grid sizes, as expected. sum.metal main.swift

Hi, When I attach BillboardComponent to anchor entities, I am no longer able to retrieve the tapped entity anymore because the collision shapes of the entity are messed up due to always orienting it towards the camera. And it does not updated the collision shapes because if I try pressing everywhere that is not my model entity, I get a hit out of nowhere. I tried updating the collision shapes of the entity every frame: for child in existingPassport.mainEntity!.children { child.generateCollisionShapes(recursive: true) } However, nothing comes of it, and it is not a smart solution in the first places because it is too heavy to recreate the shapes every frame. I am using the usual AR View Controller that works when I comment out the BillboardComponent line just fine: private func setupTapRecognizer() { let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTap)) arView.addGestureRecognizer(tapRecognizer) } @objc func handleTap(_ recognizer: UITapGestureRecognizer) { print("handle tap URL 1") let location = recognizer.location(in: arView) if let entity = arView.entity(at: location) { print("handle tap URL 2") // Assuming each entity has a URL stored in a component if let urlComponent = entity.components[URLComponent.self] { webViewPresenter?.presentFullScreenWebView(url: urlComponent.url) print("handle tap URL: \(urlComponent.url)") } } } How should we tackle this issue on iOS 18? Thanks!

Is there a working example of imageblock_slice with implicit layout somewhere? I get a compilation error when i write this: imageblock_slilce color_slice = img_blk.slice(frag->color); Error: No matching member function for call to 'slice' candidate template ignored: couldn't infer template argument 'E' candidate function template not viable: requires 2 arguments, but 1 was provided Too few template arguments for class template 'imageblock_slice' It seems the syntax has changed since the Imageblocks presentation https://developer.apple.com/videos/play/tech-talks/603/ I tried supplying the struct type of the image block between <> but it still does not work.

Hello! Brand new to the Apple developer community, so, hello everyone! I'm a game developer, we just launched our first game on PC and I'm looking to port it to ios. Time is something I'm kind of short on, and I hear it takes some jumping through hoops to get the know-how to port something to mobile. Any good sites you'd recommend for finding programmers to port your game? It's fairly simple - just a visual novel. Any and all suggestions welcome! All the best! Elijah

Does anyone know how I can disable foveation for an ImmersiveSpace? I'm aware that I could use a CompositorLayer and my own Metal rendering to control foveation, but I'm hoping that I can configure an existing/underlying LayerRenderer (or similar) to disable it for an immersive scene. Or if there's another approach I should be taking, any pointers are appreciated. Thank you!

Hi experts, When I open a USDZ file which contains perspective cameras by "Files" app in IOS 18.2/iPadOS 18.2, I can't see anything. And when I open the USDZ file in IOS 18.1/iPadOS 18.1, it works well. On the other hand, when I open a USDZ file which contains orthographic cameras in IOS 18.1 or IOS 18.2, the scene is stuck. Could you help to solve these issues please? Thanks.

Hello, I am trying to read video frames using AVAssetReaderTrackOutput. Here is the sample code: //prepare assets let asset = AVURLAsset(url: some_url) let assetReader = try AVAssetReader(asset: asset) guard let videoTrack = try await asset.loadTracks(withMediaCharacteristic: .visual).first else { throw SomeErrorCode.error } var readerSettings: [String: Any] = [ kCVPixelBufferIOSurfacePropertiesKey as String: [String: String]() ] //check if HDR video var isHDRDetected: Bool = false let hdrTracks = try await asset.loadTracks(withMediaCharacteristic: .containsHDRVideo) if hdrTracks.count > 0 { readerSettings[AVVideoAllowWideColorKey as String] = true readerSettings[kCVPixelBufferPixelFormatTypeKey as String] = kCVPixelFormatType_420YpCbCr10BiPlanarFullRange isHDRDetected = true } //add output to assetReader let output = AVAssetReaderTrackOutput(track: videoTrack, outputSettings: readerSettings) guard assetReader.canAdd(output) else { throw SomeErrorCode.error } assetReader.add(output) guard assetReader.startReading() else { throw SomeErrorCode.error } //add writer ouput settings let videoOutputSettings: [String: Any] = [ AVVideoCodecKey: AVVideoCodecType.hevc, AVVideoWidthKey: 1920, AVVideoHeightKey: 1080, ] let finalPath = "//some URL oath" let assetWriter = try AVAssetWriter(outputURL: finalPath, fileType: AVFileType.mov) guard assetWriter.canApply(outputSettings: videoOutputSettings, forMediaType: AVMediaType.video) else { throw SomeErrorCode.error } let assetWriterInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoOutputSettings) let sourcePixelAttributes: [String: Any] = [ kCVPixelBufferPixelFormatTypeKey as String: isHDRDetected ? kCVPixelFormatType_420YpCbCr10BiPlanarFullRange : kCVPixelFormatType_32ARGB, kCVPixelBufferWidthKey as String: 1920, kCVPixelBufferHeightKey as String: 1080, ] //create assetAdoptor let assetAdaptor = AVAssetWriterInputTaggedPixelBufferGroupAdaptor( assetWriterInput: assetWriterInput, sourcePixelBufferAttributes: sourcePixelAttributes) guard assetWriter.canAdd(assetWriterInput) else { throw SomeErrorCode.error } assetWriter.add(assetWriterInput) guard assetWriter.startWriting() else { throw SomeErrorCode.error } assetWriter.startSession(atSourceTime: CMTime.zero) //prepare tranfer session var session: VTPixelTransferSession? = nil guard VTPixelTransferSessionCreate(allocator: kCFAllocatorDefault, pixelTransferSessionOut: &session) == noErr, let session else { throw SomeErrorCode.error } guard let pixelBufferPool = assetAdaptor.pixelBufferPool else { throw SomeErrorCode.error } //read through frames while let nextSampleBuffer = output.copyNextSampleBuffer() { autoreleasepool { guard let imageBuffer = CMSampleBufferGetImageBuffer(nextSampleBuffer) else { return } //this part copied from (https://developer.apple.com/videos/play/wwdc2023/10181) at 23:58 timestamp let attachment = [ kCVImageBufferYCbCrMatrixKey: kCVImageBufferYCbCrMatrix_ITU_R_2020, kCVImageBufferColorPrimariesKey: kCVImageBufferColorPrimaries_ITU_R_2020, kCVImageBufferTransferFunctionKey: kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ, ] CVBufferSetAttachments(imageBuffer, attachment as CFDictionary, .shouldPropagate) //now convert to CIImage with HDR data let image = CIImage(cvPixelBuffer: imageBuffer) let cropped = "" //here perform some actions like cropping, flipping, etc. and preserve this changes by converting the extent to CGImage first: //this part copied from (https://developer.apple.com/videos/play/wwdc2023/10181) at 24:30 timestamp guard let cgImage = context.createCGImage( cropped, from: cropped.extent, format: .RGBA16, colorSpace: CGColorSpace(name: CGColorSpace.itur_2100_PQ)!) else { continue } //finally convert it back to CIImage let newScaledImage = CIImage(cgImage: cgImage) //now write it to a new pixelBuffer let pixelBufferAttributes: [String: Any] = [ kCVPixelBufferCGImageCompatibilityKey as String: true, kCVPixelBufferCGBitmapContextCompatibilityKey as String: true, ] var pixelBuffer: CVPixelBuffer? CVPixelBufferCreate( kCFAllocatorDefault, Int(newScaledImage.extent.width), Int(newScaledImage.extent.height), kCVPixelFormatType_420YpCbCr10BiPlanarFullRange, pixelBufferAttributes as CFDictionary, &pixelBuffer) guard let pixelBuffer else { continue } context.render(newScaledImage, to: pixelBuffer) //context is a CIContext reference var pixelTransferBuffer: CVPixelBuffer? CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferPool, &pixelTransferBuffer) guard let pixelTransferBuffer else { continue } // Transfer the image to the pixel buffer. guard VTPixelTransferSessionTransferImage(session, from: pixelBuffer, to: pixelTransferBuffer) == noErr else { continue } //finally append to taggedBuffer } } assetWriterInput.markAsFinished() await assetWriter.finishWriting() The result video is not in correct color as the original video. It turns out too bright. If I play around with attachment values, it can be either too dim or too bright but not exactly proper as the original video. What am I missing in my setup? I did find that kCVPixelFormatType_4444AYpCbCr16 can produce proper video output but then I can't convert it to CIImage and so I can't do the CIImage operations that I need. Mainly cropping and resizing the CIImage