title: three.js load obj/mtl renders black
body: <p>I'm trying to load a fairly complex .obj file into three.js.  Here's the code:</p>
  
  <pre><code>    // Load obj file
      var loader = new THREE.OBJMTLLoader();
      loader.load('MQ-9.obj', 'MQ-9.mtl', function(object) {
              scene.add(object);
      });
  </code></pre>
  
  <p>The MQ-9.mtl file refers to three images that are used on various places of the object (which is an MQ-9 Predator drone).  I can load the object fine but its all black.  The images don't appear to be loading.  What am I doing wrong?</p>