Added an eye tracking sample

5 年前 · fb946d46
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--- a/Assets/Scenes/FaceTracking/ARKitEyePoses.unity.meta
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--- a/Assets/Scripts/ARKitEyePoseVisualizer.cs
+++ b/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
+
+// TODO Add summary
+[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
+
+    // Start is called before the first frame update
+    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.supportedEyeGazeTracking &&
+#endif
+            (ARSession.state > ARSessionState.Ready);
+
+        SetVisible(visible);
+    }
+
+    private 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.supportedEyeGazeTracking)
+        {
+            if (m_FaceSubsystem.TryGetEyePoses(m_Face.trackableId, ref leftEyePose, 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
+    }
+}
--- a/Assets/Scripts/ARKitEyePoseVisualizer.cs.meta
+++ b/Assets/Scripts/ARKitEyePoseVisualizer.cs.meta
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