title: WPF 3D Billboards
body: <p>In a 3D scene we often need to apply labels (little textelements or icons) next to 3D object that is moving around (rotation, translation) in the scene. These labels should always face the camera but still move with the object. This technique I believe is called billboard.  </p>
  
  <p>An additional cool feature would be if the label would stay always at the same size - no matter how far away the associated object is. So the label seems to live in 2D screenspace and not in the 3D scenegraph. </p>
  
  <p>Does anyone figures out a clever way how to do this in WPF? </p>