title: Three.js moving the camera left and right side of the scene
body: <p>I am working on a three.js prototype in which a  3d model of the train is added to the scene. My requirement is to move the camera either left / right side of the scene to view the complete train. </p>
  
  <p>I tried using below code -</p>
  
  <pre><code>function onKeyDown(){
       var zdelta = 20;
       switch( event.keyCode ) {
           case 65: // look left
          camera.position.z = camera.position.z + zdelta;
          }
       }
  </code></pre>
  
  <p>But the scene was rotating rather than panning in the left side.</p>
  
  <p>So it will be great help, if anyone shares their idea on this :)</p>
  
  <p>Thanks,
  Satheesh K</p>