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Assets/SteamVR/Extras/SteamVR_GazeTracker.cs

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+//======= Copyright (c) Valve Corporation, All rights reserved. ===============
+using UnityEngine;
+using System.Collections;
+
+public struct GazeEventArgs
+{
+    public float distance;
+}
+
+public delegate void GazeEventHandler(object sender, GazeEventArgs e);
+
+public class SteamVR_GazeTracker : MonoBehaviour
+{
+    public bool isInGaze = false;
+    public event GazeEventHandler GazeOn;
+    public event GazeEventHandler GazeOff;
+    public float gazeInCutoff = 0.15f;
+    public float gazeOutCutoff = 0.4f;
+
+    // Contains a HMD tracked object that we can use to find the user's gaze
+    Transform hmdTrackedObject = null;
+
+	// Use this for initialization
+	void Start ()
+    {
+	
+	}
+
+    public virtual void OnGazeOn(GazeEventArgs e)
+    {
+        if (GazeOn != null)
+            GazeOn(this, e);
+    }
+
+    public virtual void OnGazeOff(GazeEventArgs e)
+    {
+        if (GazeOff != null)
+            GazeOff(this, e);
+    }
+
+    // Update is called once per frame
+	void Update ()
+    {
+        // If we haven't set up hmdTrackedObject find what the user is looking at
+        if (hmdTrackedObject == null)
+        {
+            SteamVR_TrackedObject[] trackedObjects = FindObjectsOfType<SteamVR_TrackedObject>();
+            foreach (SteamVR_TrackedObject tracked in trackedObjects)
+            {
+                if (tracked.index == SteamVR_TrackedObject.EIndex.Hmd)
+                {
+                    hmdTrackedObject = tracked.transform;
+                    break;
+                }
+            }
+        }
+
+        if (hmdTrackedObject)
+        {
+            Ray r = new Ray(hmdTrackedObject.position, hmdTrackedObject.forward);
+            Plane p = new Plane(hmdTrackedObject.forward, transform.position);
+
+            float enter = 0.0f;
+            if (p.Raycast(r, out enter))
+            {
+                Vector3 intersect = hmdTrackedObject.position + hmdTrackedObject.forward * enter;
+                float dist = Vector3.Distance(intersect, transform.position);
+                //Debug.Log("Gaze dist = " + dist);
+                if (dist < gazeInCutoff && !isInGaze)
+                {
+                    isInGaze = true;
+                    GazeEventArgs e;
+                    e.distance = dist;
+                    OnGazeOn(e);
+                }
+                else if (dist >= gazeOutCutoff && isInGaze)
+                {
+                    isInGaze = false;
+                    GazeEventArgs e;
+                    e.distance = dist;
+                    OnGazeOff(e);
+                }
+            }
+
+        }
+
+    }
+}