I am developing a Unity application for PCVR for use with the Vive Focus 3 and accompanying Eye Tracker. In an attempt to follow the instructions here and here, I am using VBS through SteamVR and SRAnipal, into Unity with OpenXR Plugin. I've run into a few problems.
First, the tutorial for facial and eye tracking is outdated. OpenXR Plugin no longer has a feature group for facial tracking, instead it has an interaction profile for eye gaze (or, at least my updated version does). Does anyone know if an updated tutorial is out there?
Second, I want to use eye tracking for raycasts, not for controlling a model anyway, so the tutorial isn't really relevant. I am trying to use Unity's XR Interaction Toolkit and it's XR Gaze Interactor for this purpose. However, the data supplied to the input manager is not correct. After using the input debugger to investigate the values, I noted several issues. First, VBS/SteamVR is not supplying any values whatsoever for the input values OpenXR Eye Gaze pose/position and pose/Tracking State. Second, while there is a value supplied for pose/rotation, it is not correct. For example, when testing, if I look straight forward, it supplies a rotation of (180, 0, 0) in euler. The rotation value changes when I look in a different direction, it just doesn't change to the right value. I wasn't able to discern the pattern, it is not just flipped 180 degrees. I know the tracker is working correctly because when I select Vive Pro Eye in the SteamVR taskbar, the calibration and test scene work as expected. So the data is getting messed up somewhere between SteamVR and Unity OpenXR. Since there seems to be no current tutorial for using the updated scheme with the eye gaze interaction profile, I have no clue if anyone has made this work.
