title: Error: ray.intersectScene is not a function
body: <p>I have been using the <code>sim.js</code> code and its objects for a simple WebGL project. When I needed to use the <code>frustum</code> class (see <a href="https://stackoverflow.com/questions/13125415/how-can-i-get-my-mesh-has-gone-off-screen">this question</a>) I had to update my <code>three.js</code>. One thing broke:</p>
  
  <pre><code>TypeError: ray.intersectScene is not a function                   sim.js(line 357)
       var intersects = ray.intersectScene( this.scene );
  </code></pre>
  
  <p>I checked out the source code on git, and that function does not exist in <code>ray.js</code>. How can I update this code?</p>