结果

原理

实操(以Cube举例)

第一步：如图所示，在场景中新建一个Cube，为Cube添加一个3D BoxCoxCollider 组件

第二步：新建一个脚本文件(比如：GameContorll),挂着任意一个节点上面。在start()函数中监听触摸事件

@ccclass('GameContorll')
export class GameContorll extends Component {
    start () {
        input.on(Input.EventType.TOUCH_START, this.onTouchStart, this);
    }
    onTouchStart(event: EventTouch) {

    }
}

第三部：利用摄像机进行射线检查

/*
 * @Descripttion: 
 * @version: 1.0
 * @Author: 虣虣
 * @Date: 2022-04-03 01:59:23
 * @LastEditTime: 2022-04-03 12:58:57
 */

import { _decorator, Component, Node, Camera, geometry, systemEvent, input, Input, EventTouch, PhysicsSystem } from 'cc';
const { ccclass, property } = _decorator;
@ccclass('GameContorll')
export class GameContorll extends Component {
    @property({type: Camera, displayName: "主摄像机"})
    public mainCamera: Camera = null;

    @property({type: Node, displayName: "带触摸的物体"})
    public ndTouchNode: Node = null;

    private _ray: geometry.Ray = new geometry.Ray();

    start () {
        input.on(Input.EventType.TOUCH_START, this.onTouchStart, this);
    }

    onTouchStart(event: EventTouch) {
        // 基于摄像机画射线
        this.mainCamera.screenPointToRay(event.getLocation().x, event.getLocation().y, this._ray);
        // 基于物理碰撞器的射线检查
        if (PhysicsSystem.instance.raycast(this._ray)) {
            let r = PhysicsSystem.instance.raycastResults;
            for (let index = 0; index < r.length; index++) {
                let element = r[index];
                if (element.collider.node.uuid === this.ndTouchNode.uuid) {
                    console.log("点击到物体了");
                }
            }
        }
    }
}