Rendering glitch

[apecollector]

I'm using model-viewer and for 99% of our models it works flawlessly. However there is a weird glitch where in some of our 3D models, the eyeballs show through the skin, especially when panning, yawing or zooming. This doesn't happen in https://threejs.org/editor/ or https://sandbox.babylonjs.com/ or blender / other 3D viewing software.

The model: https://cdn.themodz.dev/kids/models/3316.glb
The demo: https://themodz.dev/viewer/kids/3316

Example screenshot:

[elalish]

That looks like z-fighting, which is a precision issue and so it's affected by lots of minor camera parameter changes. Also, I'm seeing the same problem in the three.js editor:

How far behind the eyelids are the eye surfaces? Hopefully you can just push them back a little. If not this, may be a three.js transparency bug.

[apecollector]

Thanks, I didn't see it in three.js editor until I zoomed out, I'll ask our model artists about moving the eyes a little bit back and if that doesn't help I'll make an issue upstream with three.js.