gltf geometry corrupted on Safari 15

[EdwardMoyse]

I'm seeing corrupted geometry (and terrible performance, but that's for another ticket) in Safari 15 in a threejs-based webapp, Phoenix (https://hepsoftwarefoundation.org/phoenix/#/atlas). It almost looks as if the vertices and indices are out of sync for the faces - there are lots of 'new' incorrect faces. This only started with Safari 15.

Here's our ticket:
HSF/phoenix#358
but I'll of course explain below again.

To Reproduce
Steps to reproduce the behaviour:

• Download this geometry: https://github.com/HSF/phoenix/blob/master/packages/phoenix-ng/projects/phoenix-app/src/assets/geometry/ATLAS/Barrel-Toroid.gltf
• Go to this viewer https://gltf-viewer.donmccurdy.com (which is apparently using r131, but we see the same in Phoenix with r132)
• Open the downloaded geometry in Chrome and Safari. It should look fine in Chrome, but corrupted in Safari. See below for screenshots.

Screenshots

Chrome (working okay):

Safari 15 (corrupted)

Platform:

• Device: MacBook Pro (15-inch, 2017), Radeon Pro 555 2 GB
• OS: Macos 11.6
• Browser: Safari
• Three.js version: r131, r132

[mrdoob]

Have you reported this to Apple?

[EdwardMoyse]

Not yet - I will soon (but I thought people here might be more responsive with a workaround/fix).

[WestLangley]

glTF file renders correctly for me when drag-'n-dropping into the three.js editor - r133.

It also renders correctly for me in @donmccurdy's glTF viewer.

Safari 15.0, macOS 11.6, M1 iMac

[donmccurdy]

Looks correct on my machine as well: Safari 15.0, macOS 10.15.7, MacBook Pro (2012)

[mrdoob]

Seems like this may be an issue with Radeon Pro 555 drivers?

[Mugen87]

Closing then. @EdwardMoyse please redirect this issue to Apple.

[EdwardMoyse]

Hi all,

Yes, I was about to respond myself - I did a bit of a survey at CERN, and so far the only people seeing it are those with either:

Radeon Pro555X
Radeon Pro

I did try to open a ticket with Apple already, but haven't had a response.

Edit: I opened a new ticket, using feedback assistant this time:
https://feedbackassistant.apple.com/feedback/9684338
(I hope it's visible to people other than me ... this is a first for me!)

Thanks all for helping to debug this! In the meantime, I'll stick to Chrome.

[kkinnunen-apple]

Thanks, tracked also here: https://bugs.webkit.org/show_bug.cgi?id=232367