title: SceneKit Camera Animation Moving and Deceleration
body: <p>I'm moving the camera node of my SCNScene scene along the z-axis using the following code:</p>
  
  <pre><code>let moveTo = SCNAction.moveTo(SCNVector3(x:0,y:0,z:-40), duration: 40); 
  cameraNode.runAction(moveTo)
  </code></pre>
  
  <p>I would like given an event (like GameOver event fired by my game) to smoothly
  decelerate the camera until stop it.</p>
  
  <p>How can smoothly stop moving the camera?</p>