title: Unity Vector3 Slerp on wanted axis
body: <p>Hi I'm making a little 3D platformer with a player controller like zelda/mario64.<br>
  I want to add the possibility to reset the camera behind the player. It ok, not really hard, but I wanted to do this smoothly and with the camera rotating around the player.<br>
  I discovered the <code>Slerp</code> method of <code>Vector3</code> that almost do what I want. But I don't know if it's possible to force the Slerp method to make a trajectory only on the x,z plan. I dont want the camera to go above the player but turn arround it. </p>
  
  <ul>
  <li>Someone know of it's possible to <code>Vector3.Slerp()</code> only on some axis ?</li>
  <li>Or maybe <code>Vector3.Slerp()</code> is not the solution, so what can I do ?</li>
  </ul>