In a previous post I asked if 100,000 polygons is still the recommended size for USDZ Quick Look models on the web. (The answer is yes) But I realize my polygons are 4-sided but are not planar, so they have to be broken down into 2 triangles when rendered. Given that, should I shoot for 50,000 polygons (i.e., 100,000 triangles)? Or does the 100,000 polygon statistic already assume polygons will be subdivided into triangles? (The models are generated from digital terrain (GeoTIFF) data, not a 3D modeling tool)

I am finding some unexpected behavior with lights I've been adding to a RealityKit scene. For example, I created 14 PointLights, but only 8 appeared to be used to illuminate the scene. In another example, I created 7 PointLights and 7 SpotLights, and the frame rate dropped quite a bit. Are lights computationally expensive, causing some adaptive behavior by RealityKit? Should I be judicious in my use of lights for a scene? (Note: I set arView.environment.lighting.resource to a Skybox with a black image; my goal was to completely control the lighting. I don't know if that added to the computational load)

I don't know if this is an issue with Apple's Reality Converter app or Blender (I'm using 3.0 on the Mac), but when I export a model as .obj and import it to Reality Converter, the scale is off by a factor of 100. That is, the following workflow creates tiny (1/100 scale) entities: Blender > [.obj] > Reality Converter > [USDZ] But this workflow is OK: Blender > [.glb] > Reality Converter > [USDZ] Two workarounds are: export as .glb/.gltf, when exporting .obj set the scale factor to 100 in Blender Is this a known issue, or am I doing something wrong? If it is an issue, should I file a bug report?

Does Apple have any documentation on using Reality Converter to convert FBX to USDZ on an M1 Max? I'm trying to convert an .fbx file to USDZ with Apple's Reality Converter on an M1 Mac (macOS 12.3 Beta), but everything I've tried so far has failed. When I try to convert .fbx files on my Intel-based iMac Pro, it succeeds. Following some advice on these forums, I tried to install all packages from Autodesk https://www.autodesk.com/developer-network/platform-technologies/fbx-sdk-2020-0 FBX SDK 2020.0.1 Clang FBX Python SDK Mac FBX SDK 2020.0.1 Python Mac FBX Extensions SDK 2020.0.1 Mac Still no joy. I have a work around - I still have my Intel-based iMac. But I'd like to switch over to my M1 Mac for all my development. Any pointers? Note: I couldn't get the usdzconvert command line tool to work on my M1 Mac either. /usr/bin/python isn't there.

I am creating a fixed-focus camera app with the focus distance at infinity (or at least 30+ feet away). When I set lensPosition to 1.0, the images were blurry. Some tests letting autofocus do the job showed a lensPosition of about 0.808 for my wide and telephoto lenses and 0.84 for the ultra wide lens did the trick. (iPhone 13 Max) Will the lensPosition to focus at infinity vary between devices and lenses on that device? Is there a way to determine the appropriate lensPosition at run time?

I am running into a strange bug where the exact same code compiles fine in one project but generates a compiler error in another project. In particular, I am trying to create an AnchorEnity from an ARAnchor. func addModelTo(anchor: ARAnchor) { let entityAnchor = AnchorEntity(anchor: anchor) ... } The compiler error message is not even consistent. Sometimes I get a single error message: Cannot convert value of type 'ARAnchor' to expected argument type 'AnchoringComponent.Target' Other times I get an error with two possible issues: No exact matches in call to initializer Candidate '() -> AnchorEntity' requires 0 arguments, but 1 was provided (RealityFoundation.AnchorEntity) Candidate expects value of type 'AnchoringComponent.Target' for parameter #1 (got '(anchor: ARAnchor)') I'm trying to track down why this sometimes causes an error and sometimes it does not. Any pointers?

When I try to watch the WWDC22 "Platforms State of the Union" video on my Apple TV, iPhone, or iPad, using the Developer app, the video only shows a single frame every few seconds and there is no audio. The video plays fine on the Developer app on my Mac. Has anyone else had this problem? Is there a work around? (I've tried deleting the Developer app on my Apple TV and reinstalling it, but no joy).

Can ARKit/RealityKit track multiple bodies for animation simultaneously? Reviewing Apple's CapturingBodyMotionIn3D sample code (for WWDC2019 session), there is no explicit linkage between the ARBodyAnchor and the loaded BodyTrackedEntity (e.g., the AnchorEntity used for the BodyTrackedEntity is not associated with the ARBodyAnchor). There seems to be some hidden linkage between the ARKit ARBodyAnchor and the RealityKit BodyTrackedEntity. Likewise, the ARFrame has a property for only a single ARBody2D (detectedBody). My interpretation is that only a single person can be tracked at a time. Is this correct?

Has anyone successfully imported Apple's (FBX) robot for Apple's CapturingBodyMotionIn3D demo into Blender exported it back out (GLTF or other format) converted it back to USDZ via Reality Converter and gotten it to work in Apple's demo app again? I have run into numerous problems, and each effort to fix a problem leads to new ones. For example, importing Apple's FBX robot has the bones pointing in funny directions (see attachment). When I try to correct this on import by aligning the bones, the robot in the Apple app looks like it went through Star Trek transporter accident - limbs at weird angles.

I'm sharing this in case someone else wants to use Apple's RoomPlan to create a model and import it into Blender. The problem: I could not successfully import a USDZ model from the RoomPlan app into Blender. (I went through the normal process of importing a USDZ file into Blender: change the file type from ".usdz" to ".zip"; unzipped the file; then tried to import the ".usda" file). No surfaces appeared. The solution: In Apple's source code from here, in the file RoomCaptureViewController.swift, I changed the line try finalResults?.export(to: destinationURL, exportOptions: .parametric) to try finalResults?.export(to: destinationURL, exportOptions: .mesh) recompiled, and went through the USDZ to USDA conversion process again. This time it worked. Apparently Blender cannot import parametric USDA models.

Reviewing Apple's AnchorEntity documentation, I see that an AnchorEntity can be a child of an Entity in the RealityKit hierarchy. Has it always been this way? In my memory, an AnchorEntity was always just the base element in a Scene. If this was a change by Apple at some point, has Apple given examples where making an AnchorEntity a child of an Entity lets you do cool things you couldn't do before?

When setting ARView's environment camera feed exposure to a negative value to make the camera feed dimmer, for example arView.environment.background = .cameraFeed(exposureCompensation: -3) can this negatively affect ARKit's ability to track the device's localization and mapping capability? That is, is the device's use of the camera for SLAM purposes independent of the exposureCompensation value?

This is probably a minor point because it wouldn't affect distributed binaries, but I thought I'd mention it in case the behavior is unexpected. After watching WWDC 20202 Explore logging in Swift, I tried some simple examples in a Mac command-line app. I was surprised to see the strings were all printed just fine. There was no redaction. At least when running the program from Xcode. (Even using the old os_log() approach showed the strings without needing to add %{public}@.) However, if I run the program from a Terminal shell, the string arguments are properly redacted. I actually like this behavior (showing more while running in Xcode), but I thought I'd just raise the issue. Sample code and screenshot from Console are shown below. import Foundation import os let logger = Logger(subsystem: "com.example.logging_test", category: "hello") let greeting = "Hello" let personName = "World" logger.log("\(greeting), \(personName)") logger.log("\(greeting, privacy: .private), \(personName)") logger.log("\(greeting, privacy: .public), \(personName)") os_log("%@, %@", greeting, personName)

I have a strange warning in Xcode associated with ARKit. It isn't a big issue because there is a work around, but I am curious why this is happening and how I can avoid it in the future. I opened up an old AR project in Xcode, and the editor gave a strange error message on the "import ARKit" line saying Cannot load underlying module for 'ARKit' Despite the error message, the code continues to build and run. I've quit & restarted Xcode, rebooted the Mac, and even deleted and and redownloaded Xcode, but the error/warning was still there. Upon some additional testing, I discovered that I only get this message when targeting "iOS 16.2" but not when targeting 16.0, 16.1, 16.3, or 16.4. (I did not try pre-iOS 16) Any idea why my Xcode no longer likes ARKit on iOS 16.2 on my Mac? Development platform: Xcode: Version 14.3.1 (14E300c) macOS: 13.4 (22F66) Mac: Mac Studio 2022 iOS on iPhone 14 Pro Max: 16.5 (20F66) Screenshot:

I’m embarking on a new project that will involve animating 3D faces & mouths. I’m looking at using ARFaceAnchors and blendShapes to capture data that will be used to animate the models’ facial expressions. I have a few basic questions: (1) As far as I can tell, Apple has not supported exporting Memojis to rigged 3D models. Is this still the case? (2) I did find one web site that said Apple’s AvatarKit is now public, but everywhere else I’ve checked, it is still a private framework (and Xcode complains). Is AvatarKit still private? (3) It looks like all 52 blendShapes for an ARFaceAnchor are updated every frame, which updates 60 times a second This is 3120 data points per second. Are there any best practice guides to reduce the data? For example, “These 10 blendShapes capture the most important features for animating a face.” (4) It appears that visionOS does not support ARFaceAnchor. If I want to present a remote user as a Memoji (or other rigged model) in a shared experience, is there any way to do that at the current time?