[LayaAirIDE 2.0]Laya2.7.1 射线提示rayCast未定义

export default class click3d extends Laya.Script3D{



    constructor() { 

        super(); 

        //创建场景

        this.scene = Laya.stage.addChild(new Laya.Scene3D());

        //添加相机

        this.camera = (this.scene.addChild(new Laya.Camera(0, 0.1, 100)));

        this.camera.transform.translate(new Laya.Vector3(0, 0.7, 5));

        this.camera.transform.rotate(new Laya.Vector3( -15, 0, 0), true, false);

    }

    

    onEnable() {

        Laya.stage.on(Laya.Event.MOUSE_DOWN,this,this._onStageDown);    }

    _onStageDown()

    {

        //创建一个点

        var point = new Laya.Vector2();

        var outHitResult = new Laya.HitResult(); 

        //创建一个射线

        var ray= new Laya.Ray(new Laya.Vector3(0, 0, 0), new Laya.Vector3(0, 0, 0));

        //以鼠标点击的点作为原点

        point.x = Laya.stage.mouseX;

        point.y = Laya.stage.mouseY;

        //计算一个从屏幕空间生成的射线

        this.camera.viewportPointToRay(point, ray);



        this.scene.physicsSimulation.rayCast(ray,outHitResult);

        //如果碰撞到物体

        if (outHitResult.succeeded)

        {



        }

    }

}