[Bug] ARKit Eye Tracking won't show downward looks. Biased to up-looking

[AdamBebko]

Unity bug report case number Please log a bug at https://unity3d.com/unity/qa/bug-reporting and post the case number here.

Describe the bug A clear and concise description of what the bug is.

Using the AR Samples, if you look down the eye lasers don't look down to match, they seem to have a maximum downward angle, that doesn't match at all what the eyes are doing. If you look up this seems to work fine.

To Reproduce Steps to reproduce the behavior:

1. Go to ar foundation samples (I'm on iPad Pro 11''), open eye lasers demo
2. Look down
3. Eye lasers don't look down.

Expected behavior A clear and concise description of what you expected to happen.

I don't expect perfection from eye tracking from an image, but this seems to be a reproducible bias, where it won't look downward. I expect it to be able to also look downwards! this is half of the visual field!

Actual behavior A clear and concise description of what actually happened.

Only seems to follow the eye gaze when looking upwards.

See image below. My eyes are looking downwards at the floor, but the lasers only show a very slight downwards gaze. To get them to look farther down I need to move my head to also look down.

Smartphone (please complete the following information):

• Device: [e.g. iPad Pro 11'']
• OS: [e.g. iOS 14.4]
• Unity version 2020.3.7
• ARFoundation version 4.2.0-pre-5

[tdmowrer]

This doesn't look like a bug, but a limitation of ARKit. As you look down, it can see less of your eyes, so it is difficult for it to be precise here.

Apple have a native sample that demonstrates face tracking features, including eye transforms. Can you reproduce the same behavior there? https://developer.apple.com/documentation/arkit/content_anchors/tracking_and_visualizing_faces?language=objc

[tdmowrer]

This issue has been marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.