title: How to draw a line on the diameter of a sphere in ThreeJs?
body: <p>Suppose I've got a sphere like this:</p>
  
  <pre><code>var geometry = new THREE.SphereGeometry( 1, 32, 32 );
  window.sphere = new THREE.Mesh( geometry, material );
  scene.add( window.sphere );
  </code></pre>
  
  <p>How would I then draw a line around the diameter of a sphere? Preferably parallel to the x axis. The end goal here is to use such a line in conjunction with text to illustrate size (eg this sphere is 10m across). </p>