ARKit, go!

in UIViewRepresentable.updateUIView, you shouldn't be reloading the scene from disk on each update. that seems expensive if that doesn't make an impact, I'm not familiar with using SceneKit with SwiftUI, so not sure how UIViewRepresentable.updateUIView works with/against a typical SceneRenderDelegate.updateAtTime implementation. fwiw.

Use AVFoundation to encode a video from each ARFrame.capturedImage. You'll need AVAssetWriter, AVAssetWriterInput, AVAssetWriterInputPixelBufferAdaptor.

file a feature request in Feedback Assistant

in visionOS v1.0, full body tracking is not exposed to third party developers. Hand tracking can be requested. https://developer.apple.com/documentation/arkit/handtrackingprovider/?cmdf=visionOS%20hand%20tracking

there is a limit for all query ops, and there is support for cursors (a form of batching) https://developer.apple.com/documentation/cloudkit/ckqueryoperation/1514975-cursor?cmdf=cloudkit%20cursor

My understanding is, No, using compositor services requires full immersion

I would love to see some sample code showing how you're generating a dynamic texture with DrawableQueue! That said, I can see from the image that your sending UsdUVTexture.RGBA, which has 4 components, to UnlitSurface.Color, which only takes in 3 components. You need to split the RGBA out, then pass the first three into Color, and the last into Opacity.

I've submitted feedback #FB13428615

use an App Group to share across you app and extension

curious why you want to roll your own, rather than use Apple's implementation?

You must specify the bundle ID as the container identifier when instantiating your CKContainer.

Yes. surface geometry can be retrieved textures on geometries can be drawn/animated hand position can be retrieved its all possible

basically, yes, you need to upload the records to the public database once, such that subsequent devices can read them. Whether you do that thru the CloudKit console, or you write code in an app to upload/save is up to you.

Yes. the current design of NSPersistentCloudKitContainer is to sync everything. There are other sync engines available between CoreData and CloudKit, such as CKSyncEngine in iOS 17, and open source sun engines like CloudCore, which might provide more fine-grain control over sync. And of course, you can always write your own that best suits your needs.