[LayaAir 2.0]天空穹不显示

export default class GameUI extends Laya.Scene {

    constructor() {

        super();

        //加载场景文件

        this.loadScene("test/TestScene.scene");



        //添加3D场景

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



        //添加照相机

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

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

        camera.transform.rotate(new Laya.Vector3(-30, 0, 0), true, false);

        camera.clearFlag = Laya.BaseCamera.CLEARFLAG_SKY;



        var skyDome = new Laya.SkyDome();

        camera.sky = skyDome;

        skyDome.texture = Laya.Texture2D.load("res/pano.jpg");

    }



}

完全按照官方案例写的，运行就是没反应，不报错无提示，图片路径没问题