【Unity】EventSystem.current.IsPointerOverGameObject()对碰撞体起作用

本来我是用 EventSystem.current.IsPointerOverGameObject()来检测是否点击在UI上的，但是发现，他对我的碰撞体也是返回ture,研究半天。。。。找不出问题，然后发现我的相机上挂载了PhysicsRaycaster，去掉之后就好了，至于为什么相机上挂载PhysicsRaycaster，好像是我的别的同事做的一个物体拖拽，用了 IDragHandler, IBeginDragHandler, IEndDragHandler，来做对3D物体的拖拽。。。我真的是无语。。。他的代码是这样的。。。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using QFramework;public class ObjDrag : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler
{private Vector3 ObjVector3 = Vector3.zero;public string deskTag = "desk";private Collider collider;/// <summary>/// isDrag等于false无法交互/// </summary>public bool isDrag = false;void Start(){collider = GetComponent<Collider>();}public void OnBeginDrag(PointerEventData eventData){ObjVector3 = this.transform.position;if (isDrag&&Input.GetMouseButton(0)){StringEventSystem.Global.Send<string>("Begin", eventData.pointerDrag.name);Debug.Log(eventData.pointerDrag.name);}}public void OnEndDrag(PointerEventData eventData){if (isDrag){this.transform.position = ObjVector3;StringEventSystem.Global.Send<string>("EndDrag", eventData.pointerDrag.name);Debug.Log(eventData.pointerDrag.name);}}/// <summary>/// 物体可拖拽/// </summary>/// <param name="eventData"></param>public void OnDrag(PointerEventData eventData){if (isDrag && Input.GetMouseButton(0)){Vector3 screenpos = Camera.main.WorldToScreenPoint(transform.position);Vector3 mouseScreenPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenpos.z);this.transform.position = Camera.main.ScreenToWorldPoint(mouseScreenPos);Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);var hits = Physics.RaycastAll(ray);foreach (var item in hits){if (item.collider != null && item.collider.tag == deskTag){var dis0 = Vector3.Distance(Camera.main.transform.position, item.point);var offset = collider.bounds.size.magnitude / 2;var dis1 = Vector3.Distance(Camera.main.transform.position, transform.position) + offset;if (dis1 > dis0){var precent = 1 - (offset / dis0);transform.position = Camera.main.transform.position + (item.point - Camera.main.transform.position) * precent;//transform.position = item.point;}//transform.position = item.point;break;}}}}}

然后必须在摄像机上挂载Unity UGUI的PhysicsRaycaster (物理射线检测)

下面介绍一下：

PhysicsRaycaster

【Unity】 UGUI的PhysicsRaycaster (物理射线检测)组件的介绍及使用-CSDN博客

IDragHandler, IBeginDragHandler, IEndDragHandler

【Unity】IBeginDragHandler、IDragHandler 和 IEndDragHandler 介绍-CSDN博客

问题就是他们都是用于UI 元素的，然后他用在了3D物体上，导致对我的3D物体起作用，如果一定要在相机上挂载PhysicsRaycaster，又要EventSystem.current.IsPointerOverGameObject只对你的UI 元素起作用，那么可以在这个组件上，用EventMask：指定哪些层的UI元素可以接收事件。比如你的模型是层级是