title: Having numerous Reflectors in a scene: How to implement a clone() function?
body: <p>I need about 80 (moving) reflecting <code>ShapeBufferGeometry</code> in a scene and i want them to share as much material data as possible.<br />
  Apparently, the <code>clone()</code> method doesn't work with <code>Reflector</code>.<br />
  I get black geometries that don't reflect anything.<br />
  Tried to add a <code>clone()</code> method to the <code>prototype</code> as below, resulting in no visible result at all:</p>
  <pre class="lang-js prettyprint-override"><code>// Clone function for Reflector
  Reflector.prototype.clone = function() {
      return new Reflector( this.geometry, this.options );
  }
  </code></pre>
  
  <p>How would this work? Can share a Reflector among many objects?<br />
  Thanks.</p>