title: how to set the first lookAt/target of a Control
body: <p>I need to set the initial 'lookAt' point of the scene, that will be the center of the screen and of the control's rotation.
  If possible, I would prefer to set a point (or an object's position), not rotation angles.</p>
  <p>The control is OrbitControl. If I simply set lookAt before the Control initialization, the center is restored to (0,0,0) on the first user interaction, which causes a 'gap' ...</p>
  <pre><code>// camera
  camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 0.1, 20000);
  camera.position.set(0,20,20);
  camera.lookAt(new THREE.Vector3(0,10,0));
  
  // controls
  controls = new THREE.OrbitControls( camera );
  controls.addEventListener( 'change', render );
  </code></pre>
  <p>How can I set the initial point in a proper way?</p>