Transparent materials not appearing in Scene Viewer

[GabrielArakaki]

Description

Recently we've faced a few issues in some android devices where transparent materials don't appear at all on scene viewer.
We don't know yet if this is device-related or app-version-related, but we do understand that some Android devices have this issue and others don't.

On our example below we have 4 spheres on our GLB but only the top 2 have transparency.

Screen_Recording_20210714-204609_Google.mp4

*ps: Everything is working fine on model-viewer's webxr experience. We are switching the experience, only tweaking a few things regarding instructions commands and other usability stuff.

Environment tested:

Model name: Galaxy S10e
Model number: SM-G970F
Android version: 11
Google App: 12.25.10.23.arm64
Google Play Services for AR: 1.25.211460203

Live Demo

https://bolder-worried-stetson.glitch.me/

Version

• model-viewer: latest

Browser Affected

• Chrome, version: xx.x.xxxx.xx
• Edge
• Firefox
• IE
• Safari

OS

• Android
• iOS
• Linux
• MacOS
• Windows

AR

• WebXR
• SceneViewer
• QuickLook

[elalish]

@tpsiaki @AdrianAtGoogle Another Scene Viewer issue.

[AdrianAtGoogle]

Hi @GabrielArakaki thank you for bringing this to our attention.

The transparent spheres not appearing seems to be chipset related (it does not repro on pixel5); We have heard scattered reports of transparency issues on exynos/mali chipsets but haven't had such an unambiguous example asset to test against. We will follow up when we know more.