title: three.js emissive material maps
body: <p>I'm currently experimenting a bit in three.js, and I'd like to use an emissive map. I've tried just loading a texture into the emissive property of a phong material, but it doesn't work like that, unfortunately. Here's my code: </p>
  
  <pre class="lang-javascript prettyprint-override"><code>var params = {
      emissive: THREE.ImageUtils.loadTexture( emissive ),
      shininess: shininess,
      map: THREE.ImageUtils.loadTexture( map ),
      normalMap: THREE.ImageUtils.loadTexture( normalMap ),
      normalScale: new THREE.Vector2(0,-1),
      envMap: this.reflectionCube,
      combine: THREE.MixOperation,
      reflectivity: 0.05
  };
  var material = new THREE.MeshPhongMaterial(params);
  </code></pre>
  
  <p>Can anyone point me in the right direction to get the emissive map working?</p>