title: Need bump map example for libgdx
body: <p>I'm trying to figure out how to use a bump map. I can add one to a model but nothing happens, probably need to turn on some config option. Please point me to a working example.</p>
  
  <p>I only got this far:</p>
  
  <pre><code>matPlaceholder = new Material(ColorAttribute.createDiffuse(com.badlogic.gdx.graphics.Color.RED), new TextureAttribute(TextureAttribute.Bump, texBump);
  </code></pre>