Loading USDZ file take almost 30s

Question

DucBurstLive OP

Created Jun ’24

Replies 1

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Participants 2

I'm having issue with loading 1.2GB USDZ file with visionOS Here's the details

the file is download via backend api
file is download to document directory

FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)

when loading the asset, it took almost 30s to load the asset

Loaded usd((extension in RealityFoundation):RealityKit.Entity.LoadStatistics.USDLoader.rio) in 29.24642503261566 seconds

loading asset code

let model = try await Entity(contentsOf: assetUrl)

USDZ file is exported from RealityComposerPro

Did I make any mistake on the flow or is there any other approach to decrease the loading time?

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Answer 1

Graphics and Games Engineer OP

Apple

Jun ’24

Hello,

if you are able to share the USDZ file, you can upload it to a ticket on http://feedbackassistant.apple.com and if you share the ticket ID we can investigate to see if there are any performance bottlenecks. You can also take a Time Profiler trace, in Instruments, of the loading.

But, in general, you need to optimize your assets to be rendered in realtime, in order to have good loading times and a good framerate when rendering the scene. If your assets have been created for offline rendering, you need to optimize them before rendering them in realtime; this article lists several guidelines: https://developer.apple.com/documentation/realitykit/construct-an-immersive-environment-for-visionos. And this video might also be useful: https://developer.apple.com/videos/play/wwdc2024/10186/

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