title: Metal Material with MeshStandardMaterial in three.js
body: <p>From what I know it should be possible to use MeshStandardMaterial to define metal-like-materials in Three.js which should follow a pbr-roughness-metalness-workflow but I cannot find any good examples on how to accomplish that.</p>
  
  <p>I cannot use Phong-Shader, I have to stick to MeshStandardMaterial.</p>
  
  <p>I want to achieve something like this:</p>
  
  <p><img src="https://i.imgur.com/ZbF7tua.png" alt=""></p>