adding changes to samples to work with new eye tracking code

Assets/Prefabs/AR Eye Pose Visualizer.prefab

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Assets/Scripts/EyePoseVisualizer.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.XR.ARFoundation;
+using UnityEngine.XR.ARSubsystems;
+#if UNITY_IOS && !UNITY_EDITOR
+using UnityEngine.XR.ARKit;
+#endif
+
+/// <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 EyePoseVisualizer : MonoBehaviour
+{
+    [SerializeField]
+    GameObject m_EyePrefab;
+
+    public GameObject eyePrefab
+    {
+        get => m_EyePrefab;
+        set => m_EyePrefab = value;
+    }
+
+    GameObject m_LeftEyeGameObject;
+    GameObject m_RightEyeGameObject;
+
+    ARFace m_Face;
+    XRFaceSubsystem m_FaceSubsystem;
+
+    void Awake()
+    {
+        m_Face = GetComponent<ARFace>();
+        CreateEyeGameObjects();
+    }
+
+    void CreateEyeGameObjects()
+    {
+        m_LeftEyeGameObject = Instantiate(m_EyePrefab, m_Face.transform);
+        m_RightEyeGameObject = Instantiate(m_EyePrefab, m_Face.transform);
+
+        m_LeftEyeGameObject.SetActive(false);
+        m_RightEyeGameObject.SetActive(false);
+    }
+
+    void SetVisible(bool visible)
+    {
+        m_LeftEyeGameObject.SetActive(visible);
+        m_RightEyeGameObject.SetActive(visible);
+    }
+
+    void UpdateVisibility()
+    {
+        var visible =
+            enabled &&
+            (m_Face.trackingState == TrackingState.Tracking) &&
+            m_FaceSubsystem.SubsystemDescriptor.supportsEyeTracking &&
+            (ARSession.state > ARSessionState.Ready);
+
+        SetVisible(visible);
+    }
+
+    void OnEnable()
+    {
+        var faceManager = FindObjectOfType<ARFaceManager>();
+        if (faceManager != null)
+        {
+            m_FaceSubsystem = (XRFaceSubsystem)faceManager.subsystem;
+        }
+        UpdateVisibility();
+        m_Face.updated += OnUpdated;
+    }
+
+    void OnUpdated(ARFaceUpdatedEventArgs eventArgs)
+    {
+        UpdateVisibility();
+        UpdateEyeGazeFeatures();
+    }
+
+    void UpdateEyeGazeFeatures()
+    {
+        if (m_FaceSubsystem.SubsystemDescriptor.supportsEyeTracking)
+        {
+            m_LeftEyeGameObject.transform.localPosition = m_Face.leftEyePose.Value.position;
+            m_LeftEyeGameObject.transform.localRotation = m_Face.leftEyePose.Value.rotation;
+            m_RightEyeGameObject.transform.localPosition = m_Face.rightEyePose.Value.position;
+            m_RightEyeGameObject.transform.localRotation = m_Face.rightEyePose.Value.rotation;
+        }
+        else
+        {
+            Debug.Log("This subsystem does not support eye tracking.");
+        }
+    }
+}

Assets/Scripts/FixationPointVisualizer.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 FixationPointVisualizer : MonoBehaviour
+{
+	[SerializeField]
+	GameObject m_FixationPointPrefab;
+
+	public GameObject fixationPointPrefab
+	{
+		get => m_FixationPointPrefab;
+		set => m_FixationPointPrefab = value;
+	}
+
+	GameObject m_FixationPointGameObject;
+
+	ARFace m_Face;
+    XRFaceSubsystem m_FaceSubsystem;
+
+	void Awake()
+	{
+		m_Face = GetComponent<ARFace>();
+		CreateEyeGameObjects();
+	}
+
+	void CreateEyeGameObjects()
+	{
+		m_FixationPointGameObject = Instantiate(m_FixationPointPrefab, m_Face.transform);
+		m_FixationPointGameObject.SetActive(false);
+	}
+
+	void SetVisible(bool visible)
+	{
+		m_FixationPointGameObject.SetActive(visible);
+	}
+
+    void UpdateVisibility()
+	{
+		var visible =
+			enabled &&
+			(m_Face.trackingState == TrackingState.Tracking) &&
+            m_FaceSubsystem.SubsystemDescriptor.supportsEyeTracking &&
+			(ARSession.state > ARSessionState.Ready);
+
+		SetVisible(visible);
+	}
+
+    void OnEnable()
+	{
+        var faceManager = FindObjectOfType<ARFaceManager>();
+        if (faceManager != null)
+        {
+            m_FaceSubsystem = (XRFaceSubsystem)faceManager.subsystem;
+        }
+		UpdateVisibility();
+		m_Face.updated += OnUpdated;
+	}
+
+    void OnUpdated(ARFaceUpdatedEventArgs eventArgs)
+	{
+		UpdateVisibility();
+		UpdateFixationPoint();
+	}
+
+    void UpdateFixationPoint()
+	{
+        if (m_Face.fixationPoint != null)
+        {
+            // Often the gaze point will be the device (origin) or past the device so for demonstration
+            // sake, we scale back the position to be closer (approx. 10cm) to the face and therefore visible.
+            m_FixationPointGameObject.transform.localPosition = Vector3.Normalize(m_Face.fixationPoint.Value) / 10;
+        }
+        else
+        {
+            // Update onscreen text to show that eye tracking isn't supported
+        }
+	}
+
+}

Assets/Scripts/ARKitEyePoseVisualizer.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-using UnityEngine.XR.ARFoundation;
-using UnityEngine.XR.ARSubsystems;
-#if UNITY_IOS && !UNITY_EDITOR
-using UnityEngine.XR.ARKit;
-#endif
-
-/// <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
-{
-    [SerializeField]
-    GameObject m_EyePrefab;
-
-    public GameObject eyePrefab
-    {
-        get => m_EyePrefab;
-        set => m_EyePrefab = value;
-    }
-
-    GameObject m_LeftEyeGameObject;
-    GameObject m_RightEyeGameObject;
-
-    ARFace m_Face;
-#if UNITY_IOS && !UNITY_EDITOR
-    XRFaceSubsystem m_FaceSubsystem;
-#endif
-
-    void Awake()
-    {
-        m_Face = GetComponent<ARFace>();
-        CreateEyeGameObjects();
-    }
-
-    void CreateEyeGameObjects()
-    {
-        m_LeftEyeGameObject = Instantiate(m_EyePrefab, m_Face.transform);
-        m_RightEyeGameObject = Instantiate(m_EyePrefab, m_Face.transform);
-
-        m_LeftEyeGameObject.SetActive(false);
-        m_RightEyeGameObject.SetActive(false);
-    }
-
-    void SetVisible(bool visible)
-    {
-        m_LeftEyeGameObject.SetActive(visible);
-        m_RightEyeGameObject.SetActive(visible);
-    }
-
-    void UpdateVisibility()
-    {
-        var visible =
-            enabled &&
-            (m_Face.trackingState == TrackingState.Tracking) &&
-#if UNITY_IOS && !UNITY_EDITOR
-            m_FaceSubsystem.supportedEyeTracking &&
-#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();
-        UpdateEyeGazeFeatures();
-    }
-
-    void UpdateEyeGazeFeatures()
-    {
-#if UNITY_IOS && !UNITY_EDITOR
-        var leftEyePose = new Pose();
-        var rightEyePose = new Pose();
-
-        if (m_FaceSubsystem.supportedEyeTracking)
-        {
-            if (m_FaceSubsystem.TryGetLeftEyePose(m_Face.trackableId, ref leftEyePose) && m_FaceSubsystem.TryGetRightEyePose(m_Face.trackableId, ref rightEyePose))
-            {
-                m_LeftEyeGameObject.transform.localPosition = leftEyePose.position;
-                m_LeftEyeGameObject.transform.localRotation = leftEyePose.rotation;
-                m_RightEyeGameObject.transform.localPosition = rightEyePose.position;
-                m_RightEyeGameObject.transform.localRotation = rightEyePose.rotation;
-            }
-            else
-            {
-                Debug.Log("Failed to get the face's eye poses.");
-            }
-        }
-#endif
-    }
-}

Assets/Scripts/ARKitFixationPointVisualizer.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 ARKitFixationPointVisualizer : MonoBehaviour
-{
-	[SerializeField]
-	GameObject m_FixationPointPrefab;
-
-	public GameObject fixationPointPrefab
-	{
-		get => m_FixationPointPrefab;
-		set => m_FixationPointPrefab = value;
-	}
-
-	GameObject m_FixationPointGameObject;
-
-	ARFace m_Face;
-#if UNITY_IOS && !UNITY_EDITOR
-    XRFaceSubsystem m_FaceSubsystem;
-#endif
-
-	void Awake()
-	{
-		m_Face = GetComponent<ARFace>();
-		CreateEyeGameObjects();
-	}
-
-	void CreateEyeGameObjects()
-	{
-		m_FixationPointGameObject = Instantiate(m_FixationPointPrefab, m_Face.transform);
-		m_FixationPointGameObject.SetActive(false);
-	}
-
-	void SetVisible(bool visible)
-	{
-		m_FixationPointGameObject.SetActive(visible);
-	}
-
-    void UpdateVisibility()
-	{
-		var visible =
-			enabled &&
-			(m_Face.trackingState == TrackingState.Tracking) &&
-#if UNITY_IOS && !UNITY_EDITOR
-            m_FaceSubsystem.supportedEyeTracking &&
-#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();
-		UpdateFixationPoint();
-	}
-
-    void UpdateFixationPoint()
-	{
-#if UNITY_IOS && !UNITY_EDITOR
-        var fixationPoint = new Vector3();
-
-        if (m_FaceSubsystem.supportedEyeTracking)
-        {
-            if (m_FaceSubsystem.TryGetFixationPoint(m_Face.trackableId, ref fixationPoint))
-            {
-                // 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_FixationPointGameObject.transform.localPosition = Vector3.Normalize(fixationPoint) / 10;
-            }
-            else
-            {
-                Debug.Log("Failed to get the face's fixation point.");
-            }
-        }
-#endif
-	}
-
-}