.activateAR() on Android fails?

[richardrevesz]

Hi,
I am trying to auto trigger the AR mode from js with:
modelViewer.activateAR();
It works fine on my iPad (auto generated USDZ), but the AR mode on Android seems to fail and the AR button gets hidden.

Any idea about this?

[elalish]

Any console logs? And do you have a link where I can repro?

[richardrevesz]

@elalish please find it here: https://www.aronplatform.com/canvas-print-ar-demo/
you need to upload an image, select a frame size and apply crop.

[elalish]

Here's your helpful console error message: DOMException: Failed to execute 'requestSession' on 'XRSystem': The requested session requires user activation.

Where are you calling activateAR(), and why not just use our AR button? The error message says it all; you can't start WebXR without a user clicking something.

[richardrevesz]

I reorganized it a bit, so it is explicitly on button click, but still get the same error.

document.getElementById('cropbutton').onclick = async function(){ arReady = false; await until (_ => arReady == true); modelViewerTexture.activateAR() };
(I set arReady to true when it's ready)

I want to streamline the user experience, so reduce the necessary clicks as much as possible.
Any suggestion how to achieve it?

[elalish]

As I said before, this isn't a click you can get around. Your async function is waiting until that click is stale.

[richardrevesz]

Oh, I see. What a pity. Thank you for the clarification!

[david-rhodes]

@elalish Is there a reason why you can activateAR with a scene-viewer or QuickLook intent without user interaction (via JS), but we cannot do so with model-viewer? Is this purely a limitation of WebXR?

Thank you!

[elalish]

I believe Chrome takes the security a bit more seriously with WebXR since it remains in the browser and so has more access to data.