Delve into the world of graphics and game development. Discuss creating stunning visuals, optimizing game mechanics, and share resources for game developers.

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Feedback on IOS 18
I am sure others will agree with me on this. I personally don’t like the way the new reactions look. Too many different color for the reactions. I honestly prefer the old grey version for the reactions to text messages. The extra emoji thing is okay but the change in color for the heart, thumbs up and the other reactions are not the best. Auto correct is horrible in this new update by the way
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Sep ’24
How is CAShapeLayer implemented
Hello, I want to create a painting app for iOS and I saw many examples use a CAShapeLayer to draw a UIBezierPath. As I understand CoreAnimation uses the GPU so I was wondering how is this implemented on the GPU? Or in other words, how would you do it with Metal or OpenGL? I can only think of continuously updating a texture in response to the user's drawing but that would be a very resource intensive operation... Thanks
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Sep ’24
How can I pause ARView?
In my app, I have an ARView that has cameraMode set to nonAR. I occasionally hide the ARView when it is not needed and reveal it again later. While the ARView is hidden, I'd like to pause the animation to save iPhone battery life. I'd also like to do this when I know that animation in my scene has paused and the contents of the view, although still visible, is static. This was possible using SceneKit, but I can't seem to find an equivalent way to do it using RealityKit. At least as of iOS 18, a hidden ARView with an empty scene appears to use approximately 30% of the CPU. How can I pause ARView so that it won't use the battery unnecessarily? Thank you for considering this question.
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Sep ’24
Placing text over images
What is the best way to display text over images - I'd like the image to fade to white underneath the text so that the text is easier to read since I have no control over the contents of the images. I thought about having a second label behind the actual label with the same text in a slightly larger font and white color. but I'd rather have it be a gradual fading of the image just under the text rather than what looks like 3D text. Any suggestions?
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Jun ’24
Why is an OpenGL positional (spot) light interfering with non-positional light
I have a legacy OpenGL fixed-pipeline app which has been ported from Windows (32-bit) to MacOS 64-bit. The problem is that if I have a scene with a non-positional light, everything works great. If I add a positional spotlight the two lights interact, and I get incorrect results. This problem does not occur on X86_64 Macs. It does occur when the app is X86_64 running under Rosetta or native ARM64. So it's either an Apple Silicon OpenGL driver behaviour my code is triggering, or something with the on-chip Apple Silicon graphics. Here is the "normal" case: the spotlight is to the right: Here, I have moved the spotlight down (Y = 1). Notice the black areas on the cube. That's incorrect. Now, I turn off the spotlight by commenting out the "makeALight" call for the spotlight (light 6). Now, the cube is evenly lit. Here is the test code I use to generate the lights. You will need to install glfw with brew to build it. main.cpp
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Sep ’24
SteamVR working, Headset not connecting
So, I've been messing around with SteamVR on Apple Silicon and it runs as expected under Rosetta translation, I've even got a game to run. But for some reason SteamVR cannot detect a headset, even when using one that SteamVR has drivers for such as the 2017 Vive headset. Would there be any explanation as to why this is because SteamVR works as expected so that leads me to believe it's something with MacOS.
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Aug ’24
Permission denied: GenerativeFunctionMetrics
A sample of some error messages that are presented in the Xcode log for executon of a program. There is nothing in the messages that will help identify a component as the origin of the message, nor is there a locatable derinition for the various labels and fields of the text. What component or even framework does this set of messages originate? Your search engine is useless because it returns gibberish. It doesn’t even follow the common behavior of SEARCH ENGINES because it takes label strings compounded from common words and searches for the common word instead of using the catenated string that is the internal variable name that is in the text. 2024-06-22 19:45:58.089943-0500 RoomPlanExampleApp[733:30145] [ClientDonation] (+[PPSClientDonation isRegisteredSubsystem:category:]) Permission denied: GenerativeFunctionMetrics / ANEInferenceOperationPrepareForEncode. I am looking for a definition of the error with a way to locate the context in which the error occurs. 2024-06-22 19:45:58.089967-0500 RoomPlanExampleApp[733:30145] [ClientDonation] (+[PPSClientDonation sendEventWithIdentifier:payload:]) Invalid inputs: payload={ aneModelPath = "/System/Library/PrivateFrameworks/RoomScanCore.framework/PrecompiledModels/lcnn_floorplan_model.bundle/H14G.bundle/main/segment_0__ane/net.hwx"; bundleIdentfier = "com.example.apple-samplecode.RoomPlanExampleApp9QSS565686"; } 2024-06-22 19:45:58.094770-0500 RoomPlanExampleApp[733:30145] [ClientDonation] (+[PPSClientDonation sendEventWithIdentifier:payload:]) Invalid inputs: payload={ bundleIdentfier = "com.example.apple-samplecode.RoomPlanExampleApp9QSS565686"; e5FunctionName = main; numSegments = 1; }
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Jun ’24
Different measure units
I am creating a 3D model from multiple images using the photogrammetry session. Now, when the session generates an OBJ file and I measure the distance between two points, the distance is displayed sporadically in different units. Sometimes it's meters, then centimeters, or another unit altogether. How can I tell the photogrammetry session to always create the model in millimeters?
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Aug ’24
Guideline 4.3(a) Original game misinterpreted as Spam
Hello, our game Nerd Survivors has been identified as spam. The game is based on an original IP and the only games that should share any resemblance with it are from our company. Today we got notified the rejection due to the violation of Guideline 4.3 but there is no reference to the other application or even a contact to the other developer. We do use Unity as our game engine, so some parts of the code might be shared across different games, but i cannot find any other justification of the failure. "Guideline 4.3(a) - Design - Spam We noticed your app shares a similar binary, metadata, and/or concept as apps submitted to the App Store by other developers, with only minor differences. Submitting similar or repackaged apps is a form of spam that creates clutter and makes it difficult for users to discover new apps."
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May ’24
IOS issues... Guideline 4.3(a) - Design - Spam
Hey everyone, My game got rejected due to Guideline 4.3. Here's the gameplay video: https://www.youtube.com/watch?v=Vb6uBUsOSDg Does anyone have experience dealing with Guideline 4.3 and can share some insights? I already appealed, explaining that my game has online multiplayer battles, but no response yet. Feeling frustrated after spending six months on this game. Any advice or suggestions would be appreciated. Thanks!
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May ’24
xcode16beta run unreal engine has VectorIntrinsics Failed.
LogUnrealMathTest: FAILED: VectorCos: Ref vs Vec ]LogUnrealMathTest: Bad(0.000000): (0.707107 0.500000 0.342019 0.173648) (0.000000 0.000000 0.000000 0.000000) FAILED: VectorCos: Ref vs Vec LogUnrealMathTest: Bad(0.000000): (-0.707107 -0.500000 -0.342021 -0.173648) (-0.000000 -0.000000 -0.000000 -0.000000) LogMac: Error: appError called: Fatal error: [File:/Users/enginej3/Desktop/UE4/Engine/Source/Runtime/Core/Private/Tests/Math/UnrealMathTest.cpp] [Line: 1652] VectorIntrinsics Failed. this error when running after Xcode build success.this error case unreal editor crash.
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Aug ’24
Save UIImage with CATransform3D applied
I have a 3х3 Matrix which I need to apply to UIImage and save it in Documents folder. I successfully converted the 3x3 Matrix (represented as [[Double]]) to CATrasform3D and then I have broken my head with trying to figure out how to apply it to UIImage. The only property where I can I apply it is UIView(or UIImageView in case with working with UIImage) transform property. But it has nothing to do with UIImage itself. I can't save the UIImage from transformed the UIImageView with all the transformations. And all the CoreGraphic methods (like concatenate for CGContext) only work with affine transformations which not suits for me. Please give me a hint what direction I should look. Does Apple has native methods or I have to use 3rd party frameworks for this functionality?
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Aug ’24
View Matrix in Metal "Game" Sample code
I tried to understand the view matrix. The part from original code as below: private func updateGameState() { /// Update any game state before rendering uniforms[0].projectionMatrix = projectionMatrix let rotationAxis = SIMD3<Float>(1, 1, 0) let modelMatrix = matrix4x4_rotation(radians: rotation, axis: rotationAxis) let viewMatrix = matrix4x4_translation(0.0, 0.0, -8.0) uniforms[0].modelViewMatrix = simd_mul(viewMatrix, modelMatrix) rotation += 0.01 } If the view matrix is initialed in x = -0.5, as:let viewMatrix = matrix4x4_translation(-0.5, 0.0, -8.0) The cube in the MetalView will move left. I think it should move to right hand side because View Matrix is camera position, am I wrong?
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Aug ’24
AirPods pro2麦克风问题
我用的iPhone14ProMax iOS 18.0 beta5 AirPods是最新os 我玩暗区突围时队友说耳机有电流声/滋滋声 噪音很大 有的时候没有有的时候突然就有了 我使用手机麦克风就没有此问题 AirPods不在召唤范围但在保
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Aug ’24
Xcode Error in Scene Editor and Entity/Component Architecture
Hello, I'm writing to report an issue (or a documentation error). I am using the Entity/Component Architecture incorporated in the GamePlayKit framework. Additionally, I want to take advantage of the user interface provided by the Scene Editor. This is essential for me if I want to involve more people in the project. The issue occurs when linking the user interface data with the GKScene of the aforementioned framework. The first issue arises when adding a component through the interface as shown in the image Then at that moment: if let scene = GKScene(fileNamed: "GameScene") { // Get the SKScene from the loaded GKScene if let sceneNode = scene.rootNode as! GameScene? { Scene.rootNode is nil, and the scene is not presented. However, I can work around this issue by initializing the scene separately: if let scene = GKScene(fileNamed: "GameScene") { // Get the SKScene loaded separately if let sceneNode = SKScene(fileNamed: "GameScene") as! GameScene? { But from here, two issues arise: The node contains a component, and the scene has been loaded separately When trying to access a specific entity through its SKSpriteNode: self.node?.entity // Is nil It becomes very difficult to access a specific entity. When adding a component, an entity is automatically created. This is demonstrated here: The node contains a component, and the scene has been loaded separately. I only have one way to access this entity, and since there is only one, it's easy: sceneNode.entities[0] But even so, it's not very useful because when I try to access its components, it turns out they don't exist. I just wanted to mention this because it would be very helpful for me if this issue could be resolved. Thank you very much in advance.
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Aug ’24