I sketched a idea for a project in Reality Composer on my iPad, thinking when I had a chance to sit down I would work it up in Xcode. However, when I got back to my computer, I discovered I cannot open a file created in Reality Composer (or the exported Reality file) in Reality Composer Pro. Am I missing something obvious here, because this seems like a huge oversight. If anyone, can let me know how to open a file created in Reality Composer in Reality Composer Pro, I would greatly appreciate it. Partly, because there seems to be objects available in Reality Composer that are not in Reality Composer Pro. Thanks Stan

I just upgraded to Xcode 14.3. I have started seeing the following debug message show up in my console and I am not sure why. [GPUDebug] Null texture access executing kernel function "ColorCorrection" encoder: "Keyframing.SurfaceWarpFuser.InverseWarpKeyframe", dispatch: 2 It seems Metal related, but I am very confused by it. My project uses a very minimal amount of Metal. Only to get depth data from ARKit and to draw points, and I definitely do NOT have any kernel functions named ColorCorrection or an encoder named "Keyframing.SurfaceWarpFuser.InverseWarpKeyframe" I haven't changed any of my metal code, so I don't know if this is something bigger I should be concerned about. Sincerely, Stan

Hey All, How do you get the vertical field of view angle for the LiDAR camera when using ARKit (when in landscape mode specifically). There are a couple of references to the horizontal field of view scattered in other documentation. However, the notes seem to be referring to the regular camera (and give 60 degrees as the default). It there some obvious documentation I am missing, if not, how do I calculate it from the information I can get. Thanks Stan

I hope someone here can give me some insight, because I am at my wits end. I have been trying to learn Metal the past couple of months. In the process, I came across an examples and articles of Sorting Networks and decided to try and implement them in Metal. Now the problem is, if I run the code on my Mac. Everything is fine. But if I run the the same code on my iDevice (iPadPro wLIDAR), I get all sort of errors I do not understand or sorted data is corrupted and all wrong. Typical Error 2021-02-17 12:13:11.218394-0500 METAL_ISSUE[97650:6709092] [GPUDebug] Invalid device load executing kernel function "bitonicSort" encoder: "0", dispatch: 0, at offset 384 file:///Users/staque/Development/OTHER/METAL_ISSUE/METAL_ISSUE/Shaders.metal:77:40 - bitonicSort() MTLBufferArgument: 0x28006d200         Name = floats          Type = MTLArgumentTypeBuffer          Access = MTLArgumentAccessReadWrite          LocationIndex = 0          IsActive = 1          ArrayLength = 1          TypeInfo =              DataType = MTLDataTypePointer              ElementType = MTLDataTypeFloat               Access = MTLArgumentAccessReadWrite              Alignment = 4              DataSize = 4         Alignment = 4          DataSize = 4          DataType = MTLDataTypeFloat buffer: "unknown" You can pretty much drop these in the default Xcode Metal Game default app. Shader (slightly modified to track the indexes of the floats.) /*  [Using Code based off of this](https://github.com/tgymnich/MetalSort)  Rewritten to make it more understandable.  */ kernel void bitonicSort(device float *floats [[ buffer(0) ]], device int *uInts [[ buffer(1) ]], constant int &p [[ buffer(2) ]], constant int &q [[ buffer(3) ]], uint gid [[ thread_position_in_grid ]]) { int pMinusQ = p-q; int distance = 1 pMinusQ; uint gidShiftedByP = gid p; // True: Increasing / False: Descreasing bool direction = (gidShiftedByP & 2) == 0; uint gidDistance = (gid & distance); bool isGidDistanceZero = (gidDistance == 0); uint gidPlusDistance = (gid | distance); bool isLowerIndexGreaterThanHigher = (floats[gid] floats[gidPlusDistance]); if (isGidDistanceZero && isLowerIndexGreaterThanHigher == direction) { float temp = floats[gid]; floats[gid] = floats[gidPlusDistance]; floats[gidPlusDistance] = temp; int temp2 = uInts[gid]; uInts[gid] = uInts[gidPlusDistance] uInts[gidPlusDistance] = temp2; } } The call. language func runSort() { let device = MTLCreateSystemDefaultDevice()! let commandQueue = device.makeCommandQueue()! let library = device.makeDefaultLibrary()! let sortFunction = library.makeFunction(name: "bitonicSort")! let pipeline = try! device.makeComputePipelineState(function: sortFunction) let setRange = 0..1024 var floatData = [Float]() var uintData = [UInt32]() // Build the Float and index data backward to form worst case scenerio for sorting. for value in stride(from: Float(setRange.upperBound-1), to: Float(setRange.lowerBound-1), by: -1.0) { floatData.append(value) } for value in stride(from: setRange.upperBound-1, to: setRange.lowerBound-1, by: -1) { uintData.append(UInt32(value)) } print(floatData) print("") print(uintData) guard let logn = Int(exactly: log2(Double(floatData.count))) else { fatalError("data.count is not a power of 2") } for p in 0..logn { for q in 0..p+1 { let floatDataBuffer = device.makeBuffer(bytes: &floatData, length: MemoryLayoutFloat.stride * floatData.count, options: [.storageModeShared])! floatDataBuffer.label = "floatDataBuffer" let uintDataBuffer = device.makeBuffer(bytes: &uintData,   length: MemoryLayoutUInt32.stride * uintData.count,   options: [.storageModeShared])! uintDataBuffer.label = "uintDataBuffer" let threadgroupsPerGrid = MTLSize(width: floatData.count, height: 1, depth: 1) let threadsPerThreadgroup = MTLSize(width: pipeline.threadExecutionWidth, height: 1, depth: 1) var n1 = p var n2 = q let commandBuffer = commandQueue.makeCommandBuffer()! let encoder = commandBuffer.makeComputeCommandEncoder()! encoder.setComputePipelineState(pipeline) encoder.setBuffer(floatDataBuffer, offset: 0, index: 0) encoder.setBuffer(uintDataBuffer, offset: 0, index: 1) encoder.setBytes(&n1, length: MemoryLayoutFloat.stride, index: 2) encoder.setBytes(&n2, length: MemoryLayoutUInt32.stride, index: 3) encoder.dispatchThreadgroups(threadgroupsPerGrid, threadsPerThreadgroup: threadsPerThreadgroup) encoder.endEncoding() commandBuffer.commit() commandBuffer.waitUntilCompleted() let dataPointer = floatDataBuffer.contents().assumingMemoryBound(to: Float.self) let dataBufferPointer = UnsafeMutableBufferPointer(start: dataPointer, count: floatData.count) floatData = Array.init(dataBufferPointer) let dataPointer2 = uintDataBuffer.contents().assumingMemoryBound(to: UInt32.self) let dataBufferPointer2 = UnsafeMutableBufferPointer(start: dataPointer2, count: uintData.count) uintData = Array.init(dataBufferPointer2) } } print(floatData) print("") print(uintData) } If anyone has a clue what I should be doing I am all ears, because I need help. Thanks in advance. Stan

I have some Metal Code, that goes along fine and then my app starts throwing the following errors. Execution of the command buffer was aborted due to an error during execution. Caused GPU Address Fault Error (IOAF code 11) and then... Execution of the command buffer was aborted due to an error during execution. Ignored (for causing prior/excessive GPU errors) (IOAF code 4) I am guessing the prior causes the later, but I can't figure out what is causing the first exactly. Is it possible to set up a Symbolic Break Point or something to catch these types of errors? Right now I feel like I am grasping in the dark to figure out what is going wrong in my code. Thanks Stan

Before the update ARView.session seemed to be accessible, but now after the update it is not.The documentation says it should be therehttps://developer.apple.com/documentation/realitykit/arviewSo I very confused why I am getting an 'Use of unresolved identifier 'session'', since the update.Can anyone tell me how to fix?Stan