title: Find distance between iOS Device Camera and user's face
body: <p>I am trying to find distance between iOS device's front-facing camera  and user's face in the real world.</p>
  
  <p>So far, I have tried <code>ARKit/SceneKit</code>, and using <code>ARFaceAnchor</code> I am able to detect user's face distance from camera; but it works only in close proximity (up to about 88 cm). My application requires face distance detection up to 200 cms.</p>
  
  <p>I am assuming this could be achieved without the use of trueDepth data (which is being used in <code>ARFaceAnchor</code>).</p>
  
  <p>Can you put me in the right direction?</p>