Adding eye gaze position sample scene

Assets/Scripts/ARKitEyePoseVisualizer.cs

 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.XR.ARFoundation;
-using UnityEngine.XR.ARSubsystems;
+using UnityEngine.XR.ARSubsystems;
-
-// TODO Add summary
+
+/// <summary>
+/// Visualizes the eye poses for an <see cref="ARFace"/>.
+/// </summary>
+/// <remarks>
+/// Face space is the space where the origin is the transform of an <see cref="ARFace">.
+/// </remarks>
 [RequireComponent(typeof(ARFace))]
 public class ARKitEyePoseVisualizer : MonoBehaviour
 {
     XRFaceSubsystem m_FaceSubsystem;
 #endif
 
-    // Start is called before the first frame update
     void Awake()
     {
         m_Face = GetComponent<ARFace>();
         SetVisible(visible);
     }
 
-    private void OnEnable()
+    void OnEnable()
     {
 #if UNITY_IOS && !UNITY_EDITOR
         var faceManager = FindObjectOfType<ARFaceManager>();

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Assets/Scripts/ARKitEyeGazePositionVisualizer.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.XR.ARFoundation;
+using UnityEngine.XR.ARSubsystems;
+
+/// <summary>
+/// Visualizes the eye gaze position in face space for an <see cref="ARFace"/>.
+/// </summary>
+/// <remarks>
+/// Face space is the space where the origin is the transform of an <see cref="ARFace">.
+/// </remarks>
+[RequireComponent(typeof(ARFace))]
+public class ARKitEyeGazePositionVisualizer : MonoBehaviour
+{
+	[SerializeField]
+	GameObject m_GazePositionPrefab;
+
+	public GameObject gazePositionPrefab
+	{
+		get => m_GazePositionPrefab;
+		set => m_GazePositionPrefab = value;
+	}
+
+	GameObject m_GazePositionGameObject;
+
+	ARFace m_Face;
+#if UNITY_IOS && !UNITY_EDITOR
+    XRFaceSubsystem m_FaceSubsystem;
+#endif
+
+	void Awake()
+	{
+		m_Face = GetComponent<ARFace>();
+		CreateEyeGameObjects();
+	}
+
+	void CreateEyeGameObjects()
+	{
+		m_GazePositionGameObject = Instantiate(m_GazePositionPrefab, m_Face.transform);
+		m_GazePositionGameObject.SetActive(false);
+	}
+
+	void SetVisible(bool visible)
+	{
+		m_GazePositionGameObject.SetActive(visible);
+	}
+
+    void UpdateVisibility()
+	{
+		var visible =
+			enabled &&
+			(m_Face.trackingState == TrackingState.Tracking) &&
+#if UNITY_IOS && !UNITY_EDITOR
+            m_FaceSubsystem.supportedEyeGazeTracking &&
+#endif
+			(ARSession.state > ARSessionState.Ready);
+
+		SetVisible(visible);
+	}
+
+    void OnEnable()
+	{
+#if UNITY_IOS && !UNITY_EDITOR
+        var faceManager = FindObjectOfType<ARFaceManager>();
+        if (faceManager != null)
+        {
+            m_FaceSubsystem = (XRFaceSubsystem)faceManager.subsystem;
+        }
+#endif
+		UpdateVisibility();
+		m_Face.updated += OnUpdated;
+	}
+
+    void OnUpdated(ARFaceUpdatedEventArgs eventArgs)
+	{
+		UpdateVisibility();
+		UpdateEyeGazePosition();
+	}
+
+    void UpdateEyeGazePosition()
+	{
+#if UNITY_IOS && !UNITY_EDITOR
+        var gazePosition = new Vector3();
+
+        if (m_FaceSubsystem.supportedEyeGazeTracking)
+        {
+            if (m_FaceSubsystem.TryGetEyeGazePosition(m_Face.trackableId, ref gazePosition))
+            {
+                // The vector that represents the gaze offset from the face is not normalized and therefore could be behind the camera.
+                // So set the offset to be 1/10th of meter in the direction of the offset
+				m_GazePositionGameObject.transform.localPosition = Vector3.Normalize(gazePosition) / 10;
+            }
+            else
+            {
+                Debug.Log("Failed to get the face's eye poses.");
+            }
+        }
+#endif
+	}
+
+}

Assets/Scripts/ARKitEyeGazePositionVisualizer.cs.meta

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