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