CocosCreator3D 从相机位置发射射线

需要给被射线检测到的物体添加碰撞器，脚本挂载到相机即可

import { _decorator, director, Component, Node, CanvasComponent, EventTouch, CameraComponent, ModelComponent, geometry, Touch, systemEvent, SystemEventType, PhysicsSystem, LabelComponent, Material } from "cc";
import { BtnEvent } from "./BtnEvent";
const { ccclass, property } = _decorator;

@ccclass("CameraRay")
export class CameraRay extends Component {

    @property({ type: CameraComponent })
    readonly camera_3d: CameraComponent = null;

    @property({ type: Node })
    Model: Node = null;


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

    btnE: BtnEvent;

    start() {
        this.btnE = this.node.getComponent(BtnEvent);
    }

    onEnable() {
        systemEvent.on(SystemEventType.TOUCH_START, this.onTouchStart, this);
        systemEvent.on(SystemEventType.TOUCH_END, this.onTouchEnd, this);
    }

    onDisable() {
        systemEvent.off(SystemEventType.TOUCH_START, this.onTouchStart, this);
        systemEvent.off(SystemEventType.TOUCH_END, this.onTouchEnd, this);
    }

    private x = 0;
    private y = 0;

    onTouchStart(touch: Touch, event: EventTouch) {
        this.x = touch.getLocationX();
        this.y = touch.getLocationY()
    }

    onTouchEnd(touch: Touch, event: EventTouch) {
        if (touch.getLocationX() == this.x && touch.getLocationY() == this.y) {
            this.camera_3d.screenPointToRay(touch.getLocationX(), touch.getLocationY(), this._ray);
            //基于物理碰撞器的射线检测
            if (PhysicsSystem.instance.raycast(this._ray)) {
                const r = PhysicsSystem.instance.raycastResults;
                for (let i = 0; i < r.length; i++) {
                    const item = r[i];
                    if (item.collider.node.uuid == this.Model.uuid) {
                        //射线检测到的物体如果是Model的话执行这里
                    }
                }
            }
        }
    }
}