把下面这段代码覆盖http://layaair.ldc.layabox.com/demo/?D3Advance_MousePickingSample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[code]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());[/code]

附件：
Test123.zip

Test123.zip