var spointLight = scene.addChild(new Laya.SpointLight());
spointLight.ambientColor = new Laya.Vector3(0.8, 0.8, 0.8);
spointLight.specularColor = new Laya.Vector3(2.0, 2.0, 0.9);
spointLight.diffuseColor = new Laya.Vector3(1, 1, 1);
spointLight.transform.translate(new Laya.Vector3(0, 30, 0));
spointLight.attenuation = new Laya.Vector3(3.0, 3.0, 3.0);
spointLight.range = 30.0;
