图一为官网教学效果

图二为自己运行效果

请问如何才能显示出图一的效果？
昨天刚接触laya，官网教学文档中有一个永恒之光的动画demo(https://layaair.ldc.layabox.com/demo/?category=3d&group=particle&name=Particle_EternalLight)
我在官网下载了layaIDE 1.8.0 beta版本，在github上下载代码，将samples\res\threeDimen\particle文件夹移动到我的新建的3D项目中(该文件夹有该demo所需的.lh文件和相关资源)。拷贝该demo的代码修改引入资源路径，运行，结果如上图所示。

Laya3D.init(0, 0, true);
Laya.stage.scaleMode = Laya.Stage.SCALE_FULL;
Laya.stage.screenMode = Laya.Stage.SCREEN_NONE;

let scene = Laya.stage.addChild(new Laya.Scene());
let camera = scene.addChild(new Laya.Camera(0, 0.1, 100));
camera.transform.translate(new Laya.Vector3(0, 2, 4));
camera.transform.rotate(new Laya.Vector3( -15, 0, 0), true, false);
scene.addChild(Laya.Sprite3D.load("../../../../../../../res/resourse/particle/ETF_Eternal_Light.lh"));

//此处为控制台的输出 
Warning!,this class[MiniAdpter] already exist: Object {init: }
ShaderCompile use time:7  size:1426/6889
GradientDataNumber warning:the forth key is  be force set to 1.
GradientDataNumber warning:data count must lessEqual than 4
GradientDataNumber warning:the forth key is  be force set to 1.
GradientDataNumber warning:data count must lessEqual than 4
GradientDataNumber warning:the forth key is  be force set to 1.
GradientDataNumber warning:data count must lessEqual than 4