title: Interpolate camera movement along an arc of circle
body: <p>In my scene, i have a camera defined through a position and a target in 3d space. </p>
  
  <p>Given the center C and two points Pold and PNew, both at a distance of R from the center, how can i interpolate the cameras position in arbitrary amount of steps on an arc?</p>
  
  <p>My goal to is to perform a smooth animation of the view around an object located at the center point.</p>