title: Check face edge angles on iOS
body: <p>I am trying to develop on iOS a system to make sure all angles of a face are being shown. Basically, replicate the same wizard apple does when creating the face ID. I have started today playing around and following some tutorials on ARKit, implementing ARSCNViewDelegate.didUpdate delegate methods and checking ARFaceAnchor.transform, although I am struggling to make sense of the 4x4 matrix.</p>
  
  <p>Is this the right direction? Am I missing anything? Thanks!</p>