title: Is there a backface-visibility equivalent for three.js?
body: <p>I have an object with a mesh that uses a semi-transparent png texture.</p>
  
  <p>Is there a flag or option for the MeshBasicMaterial so that the back of the object is visible through the front?</p>
  
  <p>Here is some sample code:</p>
  
  <pre><code>var texture = THREE.ImageUtils.loadTexture('world.png');
  
  // create the sphere's material
  var sphereMaterial = new THREE.MeshBasicMaterial({
      map: texture,
      transparent: true,
      blending: THREE.AdditiveAlpha
  });
  
  sphereMaterial.depthTest = false;
  
  // set up the sphere vars
  var radius = 50, segments = 20, rings = 20;
  
  // create a new mesh with sphere geometry -
  var sphere = new THREE.SceneUtils.createMultiMaterialObject(
      new THREE.SphereGeometry(radius, segments, rings),[
      sphereMaterial,
      new THREE.MeshBasicMaterial({
          color: 0xa7f1ff,
          opacity: 0.6,
          wireframe: true
          })
     ]);
  </code></pre>
  
  <p>This will accurately render the sphere but the back remains invisible.</p>