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 > 0)
        {
            if (currentTarget == raycastResults[0].gameObject &&
                currentTarget != lastActivedTarget)
            {
                // 进度条的展示
                pointer.ArrowActive.fillAmount = Mathf.Lerp(1, 0, (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[0].gameObject)
                {
                    currentTarget = raycastResults[0].gameObject;
                    pointer.ArrowActive.fillAmount = 0;
                    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 = 0;
            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, 20))
        {
            //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(200, 0);
    }
    
    // Update is called once per frame
    void Update () {
        
    }
}

4.unity3d的层次结构