title: how to select keypath for keyframe animation in Scenekit?
body: <p>am trying to animate targetPosition in SCNIKConstraint using CAKeyFrame but cant figure out what keypath to use when setting up the animation.</p>
  
  <p>Two questions:</p>
  
  <ol>
  <li>Can targetPosition be animated using keyFrame?</li>
  <li>in general where/how cn i locate the keypath for SceneKit animatable properties</li>
  </ol>