ARFoundation 4.1: No Face Subsystems detected

[waldgeist]

I am using this code in ARFoundation 4.0.6 to detect if face detection is possible:

var descriptors = new List<XRFaceSubsystemDescriptor>();
SubsystemManager.GetSubsystemDescriptors(descriptors);
if (descriptors.Any()) _faceTrackingDescriptor = descriptors.First();

This works fine on my iPhone X.

But since I upgraded all ARFoundation packages to 4.1, no face tracking descriptors can be found anymore. The list is empty.

What might be the reason for this? I cannot find any changes regarding face tracking in the change logs.

[Ndupker]

I am curious if this is the same issue we are experiencing?

iOS Auto build AR Facetracking issue

We are currently having an issue where when the project is build through Jenkins or the terminal the folder 'com.unity.xr.arkit-face-tracking' does not appear in the Xcode Projects 'Libraries' folder. This then causes build issues when it is referenced elsewhere, and presumably face tracking will not function without it. In our tests we found that the issue only occurs if The 'ARKit XR Plugin' or the 'ARKit Face Tracking' plugin versions are newer than 'Version 4.1.0-preview.3'. As such we…

[waldgeist]

@Ndupker

I am curious if this is the same issue we are experiencing?
https://discussions.unity.com/t/808794

No, doesn’t seem to be the same thing.

I just came back to this thread because I finally have to upgrade to 4.1.x, because a severe iOS 16 camera bug.

And ran into the same issue I already reported back in 2020…

[waldgeist]

I just found out what the root cause is: The newer ARKit package adds a new option to the ARKit project settings: “Face Tracking”. This has not been enabled by default. After I ticket the box, the descriptor becomes available.