UnityUI遮挡3D物体射线

1.需要判断的地方

  //UI遮挡3D物体射线
   if (ZheDang.Instance.CheckGuiRaycastObjects())
   {
          return;
   }

2.独立脚本

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections.Generic;
public class ZheDang : MonoBehaviour
{
    public static ZheDang Instance;
    //下面是用来UI事件和射线
    EventSystem eventSystem;
    GraphicRaycaster RaycastInCanvas;//Canvas上有这个组件
    void Awake()
    {
        Instance = this;
        RaycastInCanvas = this.gameObject.GetComponent<GraphicRaycaster>();//这个脚本要绑定到Canvas
    }
    void Update()
    {
        if (CheckGuiRaycastObjects()) return;//如果射线检测到UI上直接返回
    }
    public bool CheckGuiRaycastObjects()//测试UI射线
    {
        PointerEventData eventData = new PointerEventData(eventSystem);
        eventData.pressPosition = Input.mousePosition;
        eventData.position = Input.mousePosition;

        List<RaycastResult> list = new List<RaycastResult>();
        RaycastInCanvas.Raycast(eventData, list);

        //Debug.Log(list.Count);
        return list.Count > 0;
    }
}
//注意：GraphicRaycaster组件默认在canvas上就有的，所以将上面脚本绑定到Canvas上就OK。
//然后运行看到当点击按钮时3D场景不会受到影响了。