title: Lightmaps in Three.js
body: <p>Lightmaps live independently of other textures, right?</p>
  
  <p>So I have to set up a second set of UVs.</p>
  
  <p>I have exported my JSON object with a second set of UVs and added the following.</p>
  
  <pre><code>geometry.faceVertexUvs[0] = geometry.faceVertexUvs[1];
  </code></pre>
  
  <p>I got no working results. What I'm missing? Maybe someone can wise me a direction. Three.js r.73</p>
  
  <pre><code>loader.load("model.js", function(geometry){
  geometry.faceVertexUvs[0] = geometry.faceVertexUvs[1];
  
  var mesh = new THREE.Mesh( geometry, new THREE.MeshPhongMaterial( {
    color: 0x777777,
    lightMap: THREE.ImageUtils.loadTexture( "lightmap.png" ),
    normalMap: THREE.ImageUtils.loadTexture( "normalmap.png" ),
    specularMap: THREE.ImageUtils.loadTexture( "specularmap.png" )
  }));
  scene.add(mesh );
  });
  </code></pre>