[Webkit-unassigned] [Bug 226265] Safari iOS ignoring URL fragment parameters when opening USDZ as BLOB in AR QuickLook

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226265

--- Comment #3 from Miles <mail at milesgreen.net> ---
Thanks for looking into. 

In fact, for me, the issue has become worse somewhere along the line. I'm not sure which release this degraded between my initial report and now.

But I'm now testing in iOS 15.4 beta, and when I try to generate a USDZ blob and append #allowsContentScaling=0, now AR Quick Look opens the camera view, but the model is never rendered, I just keep seeing the initial loading spinner which never resolves. 

When generating a USDZ blob without appending #allowsContentScaling=0, AR QuickLook renders the model fine. 

I'm using the Model-Viewer.dev component to open in AR, which in turn leverages three.js to auto generate a USDZ from GLB source. 

Demo here:
https://modelviewer-auto-usdz.glitch.me

When 'Fixed Scale' is not selected (does not append allowsContentScaling parameter), USDZ is generated and displays in AR as expected. 

When 'Fixed Scale' is selected (does append allowsContentScaling=0), USDZ is not displayed in Quick Look view. 

The part in the Model-Viewer code that pertains to this is here:

https://github.com/google/model-viewer/blob/77c1f8aff8fe9d9004672e5bc81b941ea986aa68/packages/model-viewer/src/features/ar.ts#L368


Do you have a working example that you are able to verify is working?

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