title: How to detect collision in three.js?
body: <p>I am using three.js.</p>
  
  <p>I have two mesh geometries in my scene.</p>
  
  <p>If these geometries are intersected (or <em>would intersect</em> if translated) I want to detect this as a collision.</p>
  
  <p>How do I go about performing collision detection with three.js? If three.js does not have collision detection facilities, are there other libraries I might use in conjuction with three.js?</p>