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

⚠ NOTICE

This legacy plugin is no longer being updated and maintained, please develop mobile content with OpenXR 2-in-1 Unity / Unreal package .


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

  1. In Unity, switch build target to Android.

EyeTracking_Wave_Migration_Unity1.png

  1. Install the latest version of VIVE OpenXR Plugin – Android.

EyeTracking_OpenXR_Migration_Unity1.png

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

EyeTracking_OpenXR_Migration_Unity2.png

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

EyeTracking_OpenXR_Migration_Unity3.png

  1. Add this line to the AndroidManifest:
<uses-feature android:name="wave.feature.eyetracking" android:required="true" />


Setup Scene

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

EyeTracking_OpenXR_Migration_Unity4.png
EyeTracking_OpenXR_Migration_Unity5.png

  1. 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}");
  }
}
  1. Add the references for the Input Action Asset and Input Action Reference.

EyeTracking_OpenXR_Migration_Unity6.png