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(null != GazeOn){
GazeOn(this, gazeEventArgs);
}
}
public virtual void OnGazeOff(GazeEventArgs gazeEventArgs){
if(null != GazeOff){
GazeOff(this, gazeEventArgs);
}
}
protected virtual void Update(){
//If we haven’t set up hmdTrackedObject find what the user is looking at
if(null == hmdTrackedObject){
SteamVR_TrackedObject[] trackedObjects = FindObjectsOfType<SteamVR_TrackedObject>();
foreach(SteamVR_TrackedObject tracked in trackedObjects){
if(tracked.index == SteamVR_TrackedObject.EIndex.Hmd){
hmdTrackedObject = tracked.transform;
break;
}
}
} //立钻哥哥：if(null == hmdTrackedObject){}
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;
//(“立钻哥哥：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);
}
} //立钻哥哥：if((ray, out enter)){}
} //立钻哥哥：if(hmdTrackedObject){}
} //立钻哥哥：protected virtual void Update(){}
} //立钻哥哥：public class SteamVR_GazeTracker:MonoBehaviour{}
public struct GazeEventArgs{
public float distance;
}
public delegate void GazeEventHandler(object sender, GazeEventArgs gazeEventArgs);
} //立钻哥哥：namespace {}