上传的是导出的东西,laya中用这个方法获取不到材质
var rootSkinMesh = scene.addChild(new Laya.Sprite3D());
var skinMesh0 = rootSkinMesh.addChild(new Laya.MeshSprite3D(Laya.Mesh.load("3d/LayaScene_/Library/unity default resources-Cube.lm")));
var skinMesh1 = rootSkinMesh.addChild(new Laya.MeshSprite3D(Laya.Mesh.load("3d/LayaScene_/Library/unity default resources-Sphere.lm")));