I try to add metal material to my model I export it from blender it have extension .babylon
var sphereMetal = BABYLON.SceneLoader.Append("./", "untitled.babylon", scene, function (scene) {});
var metal = new BABYLON.PBRMaterial("metal", scene);
metal.reflectionTexture = hdrTexture;
metal.microSurface = 0.96;
metal.reflectivityColor = new BABYLON.Color3(0.85, 0.85, 0.85);
metal.albedoColor = new BABYLON.Color3(0.01, 0.01, 0.01);
sphereMetal.material = metal;
but it dont have any effect