Eye Tracking – Migrating from VIVE Pro Eye to Focus 3 using Unity and OpenXR

What will you learn?

You will learn how to migrate your eye tracking project from VIVE Pro Eye to Focus 3 using OpenXR and Unity.

Note: In this tutorial we will use Unity 2021.3.9f1 and VIVE Focus 3.

Project Settings

In Unity, switch build target to Android.

Install the latest version of VIVE OpenXR Plugin – Android.

Go to Edit > Project Settings > XR Plug-in Management and enable OpenXR and VIVE Focus 3 Support feature group.

Go to Edit > Project Settings > XR Plug-in Management > OpenXR and add the Eye Gaze Interaction profile.

Add this line to the AndroidManifest:

<uses-feature android:name="wave.feature.eyetracking" android:required="true" />

Setup Scene

Add the Eye Gaze (OpenXR) binding to your input actions asset.

Create a script to utilize the data.

using UnityEngine;
using UnityEngine.InputSystem;

public class EyeGazeTest : MonoBehaviour
{
    [SerializeField] private InputActionAsset actionAsset;
    [SerializeField] private InputActionReference eyePose;

    private void OnEnable()
    {
        if (actionAsset != null)
        {
            actionAsset.Enable();
        }
    }

    private void Update()
    {
        UnityEngine.XR.OpenXR.Input.Pose pose = 
            eyePose.action.ReadValue<UnityEngine.XR.OpenXR.Input.Pose>();
        Debug.Log($"Position: {pose.position} Rotation: {pose.rotation}");
    }
}

Add the references for the Input Action Asset and Input Action Reference.