As you can see, it is a transparent spherical shell model with a ball inside. Everything is normal on the front side, but there are strange mesh triangles on the side and back view. I don't know if this is as expected and what I need to do to remove these strange effects.

We are developing a mixed reality app for Vision Pro using Reality Composer Pro, but we're consistently encountering a Protobuf-related crash whenever we enter the immersive space. Our Reality Composer Pro package is quite complex, with numerous objects. Could the complexity of the package be contributing to the issue, or could something else be at play? No errors are being flagged in the code or Reality Composer itself. Here’s the error log: [libprotobuf FATAL /Library/Caches/com.apple.xbs/Sources/REKit/ThirdParty/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc:276] CHECK failed: (count) >= (0): libc++abi: terminating due to uncaught exception of type google::protobuf::FatalException: CHECK failed: (count) >= (0): Any insight on what might be causing this would be appreciated.

I am trying to achieve an effect such that the particles of a particle system are attracted to my hand entity. The hand entity is essentially an AnchorEntity that is tracking my right hand. let particleEmitterEntities = context.entities(matching: particleEmitterQuery, updatingSystemWhen: .rendering) for particleEmitterEntity in particleEmitterEntities { if var particleEmitter = particleEmitterEntity.components[ParticleEmitterComponent.self] { particleEmitter.mainEmitter.attractionCenter = rightHandEntity.position(relativeTo: nil) // trying to get the world space position of the hand // I also tried relative to particleEmitterEntity particleEmitterEntity.components[ParticleEmitterComponent.self] = particleEmitter } else { fatalError("Cannot find particle emitter") } } The particle attraction center doesn't seem to update Another issue I am noticing here that My particle system doesn't show the particle image a lot of times and just renders a placeholder square when I do this, when I comment this code out I get the right particle image. I believe this is due to the number of times this loop runs to update the position of the attraction center. What is the right way to do an effect where the particles are attracted to my hand.

Hello, I am looking to create a shader to update an entity's rendering. As a basic example say I want to recolour an entity, but leave its original textures showing through: I understand with VisionOS I need to use Reality Composer Pro to create the shader, but I'm lost as how to reference the original colour that I'm trying to update in the node graph. All my attempts appear to completely override the textures in the entity (and its sub-entities) that I want to impact. Also the tutorials / examples I've looked at appear to create materials, not add an effect on top of existing materials. Any hints or pointers? Assuming this is possible, I've been trying to load the material in code, and apply to an entity. But do I need to do this to all child entities, or just the topmost? do { let entity = MyAssets.createModelEntity(.plane) // Loads from bundle and performs config let material = try await ShaderGraphMaterial(named: "/Root/TestMaterial", from: "Test", in: realityKitContentBundle) entity.applyToChildren { $0.components[ModelComponent.self]?.materials = [material] } root.addChild(entity) } catch { fatalError(error.localizedDescription) }

Is it possible to manage the behavior of timeline totally from code? I am exploring the Compose interactive 3D content in Reality Composer Pro sample project after seeing the related video, but the example shows only the use of Behaviors from RCP to activate timelines actions. I was wondering if it is possible to, somehow, retrieve some kind of timeline controller that allows me access to its informations just like the AnimationPlaybackController does with single animations. What I would like to achieve is being able to play/pause/retrieve timestamp from them in order to allow synchronization between different users on SharePlay

I just do as the document in https://developer.apple.com/documentation/shadergraph/realitykit/cube-image-(realitykit) I have a .ktx file, and use CubeImage node to load it, then Convert node, but it shows black. I check it on my Vision Pro, it's still black, I don't know why? Is it something wrong? ps: I also use Image node to load .ktx file, it shows one image, so I belive .ktx file is right. I alse checked it on Vision Pro.

I have been experimenting some experiences in which I would like to use SharePlay to allow the app to be used by multiple users. Currently I achieved sharing a volume containing a Reality Composer Pro scene inside of it, the scene contains some entities with an animation. So far I have been able to correctly share the volume and its content, with the animation playing without problems, but once I activate SharePlay different users see different moments of the animation if no animation at all. Is there a way to synchronize animations between all the users, no matter when someone entered the SharePlay session, aside from communicating the animation time once someone joins?

In WWDC24, visionOS hand tracking has a new function that can make an entity track the hand faster (but at the expense of a certain degree of accuracy), and the video only explains how to implement ARKit, so please ask how to implement the anchorEntiy in the reality view.

This is a follow up question for this post There are several entities I created in rcp that I want to play their animations in a sequence (the order is dynamic) My plan is to have onReceive detecting the notification, remove the current entity from the scene, add the next entity from the queue... Somehow, when I call removeFromParent()/removeChild(), either it is not removed or everything is removed and the app crashes, any tips?

A timeline in RCP will post a notification "Identifier: Completed" when it finishes playing I am trying to receive this in the following way: extension Notification.Name { static let notifyOnAnimationCompleted = Notification.Name("Completed") } // in the view private let AnimationCompleted = NotificationCenter.default.publisher(for: .notifyOnAnimationCompleted) RealityView {...} .onReceive(AnimationCompleted) { _ in print("End") } This was once working back to July, but it never prints "End" for now

How to detect whether two entities collide in RealityView and execute some instructions after the collision. It is assumed that both entities have collision components, and one of them also has an anchor component (such as a binding hand).

I saw onnoffitacation in the Behavior configuration of Reality Composer pro, which asked me to enter the Nofficatition name, that is to say, this requires swift in Xcode to send a message. There is a message name in the message, so I hope you can write a list for me how to use Swift in Xcode to send a message containing the message name.(There is an answer in https://developer.apple.com/forums/thread/756978, but it doesn't work.) and in the time line in Reality Composer Pro, there is a Notification action, which is used to send messages to swift. How can I ask swift to detect whether the Notification action has sent a message?(There is an answer in https://developer.apple.com/videos/play/wwdc2024/10102/, but it doesn't work.) I have asked this question before (https://developer.apple.com/forums/thread/756978). Those answers were available before, but now they are all invalid in the latest system. I hope you can help me. Thank you.

Given my limited knowledge of physics, I would appreciate it if individuals with a solid understanding of the subject could provide insights into this matter. I have added a physical component to a entity in Reality Composer Pro, but I am seeking guidance on how to achieve the following: Make an object float in the air (with a slight downward motion reminiscent of the moon’s surface) Enable the object to move at a slow pace Implement a strong rebound force I would be grateful if you could provide appropriate values for these parameters. Thank you for your assistance.

I have a created an AnchorEntity for my index finger tip and then created a model entity (A sphere) as a child of it. This model entity has a collision component and a physics body component. I tried using dynamic and kinematic modes for the physics body component. I have created a plane from a cube that has collision component and a static physics body. I have subscribed to the CollisionEvents.Began on this plane. I have also stored it in a EventSubscription state variable. @State private var collisionSubscription: EventSubscription? The I subscribed as follows collisionSubscription = content.subscribe(to: CollisionEvents.Began.self, on: self.boxTopCollision, { collisionEvent in print("something collided with the box top") }) The collision event fires when I directly put the sphere above the plane and let gravity do the collision, but when the the sphere is the child of the anchor entity, the collision events don't happen. I tried adding collision and physics body component directly to the anchor entity and that doesn't work too. I created another sphere with a physics body and a collision component and input target component and manipulate it with a drag gesture. When the manipulation is happening and collide the plane and the sphere the events don't happen when my sphere is touching the plane, but when the gesture end and the sphere is in contact with the plane, the event gets fired. I am confused as to why this is happening. All I want to do is have a collider on my finger tip and want to detect the collision with this plane. How can I make this work? Is there some unstated rule somewhere as where a physics body is manipulated manually it cannot trigger collision events? For more context. I am using SpatialTrackingSession with the tracking configuration of .hand. I am successfully able to track the finger tip.

Hello, I am getting following error on console and my app crashes. It goes to dark and then Apple logo appears and app crashes apply fence tx failed (client=0x61dbbfd7) [0xfffffecc (ipc/mig) server died] [C:3] Error received: Connection interrupted. Failed to commit transaction (client=0x94097449) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0xe9684b50) [0x10000003 (ipc/send) invalid destination port] [C:3-1] Error received: Connection interrupted. Failed to commit transaction (client=0xbcac17e9) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0x52392119) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0xff841d17) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0xdef5c915) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0xefdc8bf3) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0xd50c1eff) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0x15690a46) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0xf296f56b) [0x10000003 (ipc/send) invalid destination port] Failed to commit transaction (client=0x61dbbfd7) [0x10000003 (ipc/send) invalid destination port] apply fence tx failed (client=0x61dbbfd7) [0x10000003 (ipc/send) invalid destination port] nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_read_request_report [C1] Receive failed with error "No message available on STREAM" nw_protocol_socket_reset_linger [C1:2] setsockopt SO_LINGER failed [22: Invalid argument] apply fence tx failed (client=0x61dbbfd7) [0x10000003 (ipc/send) invalid destination port] Failed to set override status for bind point component member. Failed to set override status for bind point component member. Failed to set override status for bind point component member. Message from debugger: Terminated due to signal 9 Could you please tell me what's the reason and how can I resolve this. When I loads 2,3 times then app works fine from that point onwards. But this happens time to time when debug.

In my VisionPro app, I'm facing a problem with loading USDZ models from a RealityKitBundle package, created using Reality Composer Pro. It was working fine until I added more models to the package. As I added more models with large textures in the project, the app started to show them with texturing problems. So, when I load the models from the RealityView using Entity(named:in), the mesh loads correctly, but all black, with no textures, as below: However, when I load the same USDZ directly from the main bundle, using ModelEntity(named:in), it loads fine. I know that large textures can cause memory issues, but when talking about one single model, I know that it's not enough to cause a memory overflow in the VisionPro. This USDZ model is about 40MB with something around 800MB of texture memory (from the RealityComposerPro Statistic tab). I've built experiences in VisionPro with much heavier models, and they do present the same texture issues, but only after there's more than 3 huge models enabled in the Reality scene. But that's not the case. The un-textured model appears right from the beginning, so it seems to me that's not a runtime issue in the device, but rather some issue in the packaging process from RealityComposerPro to XCode to the Device, am I correct? I'm also using a simple Mac Mini with M2 but only 8MB of RAM. Maybe that's the issue? As I still want to use RealityComposerPro to build more dev-friendly and interesting applications, I'd really appreciate some guidance here! Thanks in advance!

Hi I have setup animation using timeline in Reality Composer Pro like below This get triggered by a notification posts from the code.Once this time line triggered, I want to repeat this 2 animations in the timeline unitll user takes the next action. How can I make these repeat forever?

I'm developing a VisionOS app and I'm trying to load a ModelEntity from a USDZ file which is inside my custom RealityKit package called R2UVisionOficial. But it keeps giving me an resourceNotFound error. import RealityKit import R2UVisionOficial import ARKit /* more code */ do { let newEntity: Entity //... // Loads entity from USDZ inside package newEntity = try await ModelEntity(named: "Salas", in: r2UVisionOficialBundle) //... return newEntity } catch { print("wtManager >>> **** FAILED to load entity:", error.localizedDescription) throw error } I'm sure I have the Salas.usdz file in the root folder of my package and that I'm using the correct paths. However I keep getting the error: Failed to find resource with name "Salas" in bundle It's funny because when I try to load a USDA (scenes) from the same packages, it works fine. So I guess there's something to do with ModelEntity or USDZ files. Can you please help me? P.S. This issue is similar to https://developer.apple.com/forums/thread/746842?answerId=780415022#780415022

Hello everyone, I'm a Computer Science student. My supervisor has given me some topics for my final year project, and one of them involves using Vision Pro for facial recognition—specifically, identifying a designated face to display specific information. As a developer, my understanding of Vision Pro is quite limited. I've done some research online and found that Unity and Xcode are used as development tools. Traditionally, facial recognition is done using OpenCV. However, I've come across articles stating that Apple, due to security reasons, cannot implement facial recognition. I’d like to ask if that’s true. Also, with VisionOS 2 featuring object tracking and image tracking, could these methods potentially replace facial recognition?

In iOS, to display a RealityView, you can assign a value to the content.camera property: content.camera = .virtual However, how can this be implemented in macOS and tvOS?