[]射线BUG

把下面这段代码覆盖http://layaair.ldc.layabox.com ... ample里的代码后执行代码是可以的，但是自己建一个空项目，运行后就会报错，这是不是引擎BUG，下面附上示例，麻烦测试一下，我用的是1.7.1JS版的

function MousePickingScene() {

    MousePickingScene.super(this);

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

    this.point = new Laya.Vector2();

    this._outHitInfo = new Laya.RaycastHit();

    this.phasorSpriter3D = new Laya.PhasorSpriter3D();



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

    this.camera.transform.translate(new Laya.Vector3(0, 1, 3));

    //camera.addComponent(CameraMoveScript);

    this.camera.clearColor = null;

}

Laya.class(MousePickingScene, "MousePickingScene", Laya.Scene);





MousePickingScene.prototype.lateRender = function (state) {

    MousePickingScene.__super.prototype.lateRender.call(state);

    //从屏幕空间生成射线

    this.point.elements[0] = Laya.stage.mouseX;

    this.point.elements[1] = Laya.stage.mouseY;

    this.camera.viewportPointToRay(this.point, this.ray);



    //射线检测,射线相交的<最近物体>,最大检测距离30米,只检测第13层

    Laya.Physics.rayCast(this.ray, this._outHitInfo, 30, 13);

    if (this._outHitInfo.distance !== -1){

        alert("666");

    }

    this.phasorSpriter3D.begin(Laya.WebGLContext.LINES, state);

    //绘出射线

    this.phasorSpriter3D.line(this.ray.origin.x, this.ray.origin.y, this.ray.origin.z, 1.0, 0.0, 0.0, 1.0, 0, -1, 0, 1.0, 0.0, 0.0, 1.0);

    this.phasorSpriter3D.end();

}



Laya3D.init(0, 0,true);

Laya.stage.scaleMode = Laya.Stage.SCALE_FULL;

Laya.stage.screenMode = Laya.Stage.SCREEN_NONE;

Laya.Stat.show();

Laya.stage.addChild(new MousePickingScene());