ARCore: Sceneform demo bug on loading asset from virtual device

Question

Hi and thanks in advance to anyone who can help me or give me some suggestions.

I was working on the Google ARCore demo, specifically the "Hellosceneform" one, where user can put a 3D model on a plane.

To test the import of different 3D assets, I changed the default "Andy" 3D model with another 3D model made by me, in the usual .sfb format and I tested the demo on Android Emulator.

The problem is this:

• if I load a 3D asset from the "raw" directory into the demo works perfectly...
• ...BUT, in the Android Emulator, if I load an asset from a directory on the device filesystem (for example, the default appath of 'sceneform' demo) the ModelRenderable (called andyRenderable in my code) in onTapListener is always null!

More importantly: the demo works perfectly on a real phone, in both situation (raw and device file system).

The code that loads the 3D asset is this:

    File fsfb = new File(local_path + "/" + "prova3.sfb");

    Uri usfb = Uri.fromFile(fsfb);
    ModelRenderable.builder()
            .setSource(this, usfb)
            .build()
            .thenAccept(renderable -> andyRenderable = renderable)
            .exceptionally(
                    throwable -> {
                        Toast toast =
                                Toast.makeText(this, "Unable to load andy renderable", Toast.LENGTH_LONG);
                        toast.setGravity(Gravity.CENTER, 0, 0);
                        toast.show();
                        return null;
                    });

And the onTapListener code is this:

arFragment.setOnTapArPlaneListener(
            (HitResult hitResult, Plane plane, MotionEvent motionEvent) -> {

                if(nn >= 3 || andyRenderable == null)
                {
                    return;
                }
                nn++;

Answer 1

Solved.

It was a matter of wrong permissions for the raw directory (it was impossible to load the model, it needed "rw" settings).