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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;
+
+namespace Valve.VR.Extras
+{
+    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
+        protected Transform hmdTrackedObject = null;
+
+        public virtual void OnGazeOn(GazeEventArgs gazeEventArgs)
+        {
+            if (GazeOn != null)
+                GazeOn(this, gazeEventArgs);
+        }
+
+        public virtual void OnGazeOff(GazeEventArgs gazeEventArgs)
+        {
+            if (GazeOff != null)
+                GazeOff(this, gazeEventArgs);
+        }
+
+        protected virtual 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 ray = new Ray(hmdTrackedObject.position, hmdTrackedObject.forward);
+                Plane plane = new Plane(hmdTrackedObject.forward, transform.position);
+
+                float enter = 0.0f;
+                if (plane.Raycast(ray, 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 gazeEventArgs;
+                        gazeEventArgs.distance = dist;
+                        OnGazeOn(gazeEventArgs);
+                    }
+                    else if (dist >= gazeOutCutoff && isInGaze)
+                    {
+                        isInGaze = false;
+                        GazeEventArgs gazeEventArgs;
+                        gazeEventArgs.distance = dist;
+                        OnGazeOff(gazeEventArgs);
+                    }
+                }
+
+            }
+
+        }
+    }
+    public struct GazeEventArgs
+    {
+        public float distance;
+    }
+
+    public delegate void GazeEventHandler(object sender, GazeEventArgs gazeEventArgs);
+}