使用鼠标左键事件实现VR中的Eye Gaze Input

1.光标以及光标动画的显示

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;

 [ExecuteInEditMode]
 public class Pointer : MonoBehaviour
 {
     public Transform ArrowNormal;
     public Image ArrowActive;

     // Use this for initialization
     void Start ()
     {
         ArrowNormal = transform.Find("ArrowNormal");
         ArrowActive = transform.Find("ArrowNormal/ArrowActive").GetComponent<Image>();
     }
 }

2.头盔相机射线确定光标位置以及点击逻辑的实现

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.UI;

 [RequireComponent(typeof(Pointer))]
 public class PointerCaster : MonoBehaviour
 {
     private GameObject currentTarget;
     private GameObject lastActivedTarget;
     private PointerEventData pointerEventData;

     private Pointer pointer;
     [SerializeField]
     private float clickedDelta;
     private float nextfocusTime;

     // Use this for initialization
     void Start ()
     {
         // 如果没有开启XR的支持关闭些模块
         if (!UnityEngine.XR.XRSettings.enabled)
             gameObject.SetActive(false);
         else
         {
             pointer = GetComponent<Pointer>();
             nextfocusTime = Time.time + clickedDelta;
             pointerEventData = new PointerEventData(EventSystem.current);
         }
     }

     private void SimulateInput(PointerEventData pointerData)
     {
         List<RaycastResult> raycastResults = new List<RaycastResult>();
         EventSystem.current.RaycastAll(pointerData, raycastResults);
         if (raycastResults.Count > )
         {
             if (currentTarget == raycastResults[].gameObject &&
                 currentTarget != lastActivedTarget)
             {
                 // 进度条的展示
                 pointer.ArrowActive.fillAmount = Mathf.Lerp(, , (nextfocusTime - Time.time) / clickedDelta);

                 if (currentTarget.GetComponent<Selectable>())
                     currentTarget.GetComponent<Selectable>().OnPointerEnter(pointerData);

                 if (Time.time >= nextfocusTime)
                 {
                     lastActivedTarget = currentTarget;
                     // 鼠标左键点击
                     if (currentTarget.GetComponent<ISubmitHandler>() != null)
                     {
                         // 点击后重置[可以进行下一次点击]
                         lastActivedTarget = null;
                         nextfocusTime = Time.time + clickedDelta;
                         currentTarget.GetComponent<ISubmitHandler>().OnSubmit(pointerData);
                     }
                     else if (currentTarget.GetComponentInParent<ISubmitHandler>() != null)
                     {
                         // 点击后重置[可以进行下一次点击]
                         lastActivedTarget = null;
                         nextfocusTime = Time.time + clickedDelta;
                         currentTarget.GetComponentInParent<ISubmitHandler>().OnSubmit(pointerData);
                     }
                 }
             }
             // 当前对象不是currentTarget
             // 或者当前对象已经触发点击[currentTarget=lastActivedTarget]
             else
             {
                 if (currentTarget && currentTarget.GetComponent<Selectable>())
                     currentTarget.GetComponent<Selectable>().OnPointerExit(pointerData);

                 if (currentTarget != raycastResults[].gameObject)
                 {
                     currentTarget = raycastResults[].gameObject;
                     pointer.ArrowActive.fillAmount = ;
                     nextfocusTime = Time.time + clickedDelta;
                 }
             }
         }
         // 没有目标状态重置
         else
         {
             lastActivedTarget = null;
             if (currentTarget && currentTarget.GetComponent<Selectable>())
                 currentTarget.GetComponent<Selectable>().OnPointerExit(pointerData);

             currentTarget = null;
             pointer.ArrowActive.fillAmount = ;
             nextfocusTime = Time.time + clickedDelta;
         }
     }

     // Update is called once per frame
     void Update ()
     {
         RaycastHit hit;
         Ray ray = new Ray(Camera.main.transform.position, Camera.main.transform.forward);
         if (Physics.Raycast(ray, out hit, ))
         {
             //pointer.ArrowNormal.position = hit.point;
             //Debug.LogWarning(hit.point);
             var sp = Camera.main.WorldToScreenPoint(hit.point);
             pointerEventData.position = sp;
             pointerEventData.button = PointerEventData.InputButton.Left;
             // 模拟输入处理
             SimulateInput(pointerEventData);
         }
     }
 }

3.射线碰撞面的大小适应

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;

 [RequireComponent(typeof(BoxCollider))]
 public class ScreenAdapter : MonoBehaviour
 {
     private BoxCollider bc;
     // Use this for initialization
     void Start ()
     {
         bc = GetComponent<BoxCollider>();
         bc.size = transform.parent.GetComponent<RectTransform>().sizeDelta;
         bc.size += new Vector3(, );
     }

     // Update is called once per frame
     void Update () {

     }
 }

4.unity3d的层次结构