title: aframe vector unproject not working and not sure?bug?
body: <p>I try used threejs to test out simple 3D plane without mesh object just zero plane base on camera with unproject and it work. But I try on Aframe it didn't work and there is bug.</p>
  
  <p>getInverse > m.elements error that it show on the console log.</p>
  
  <p>Here simple example of Aframe. <a href="https://gist.github.com/Lightnet/8fb3d4a7c5f3ed2b3865bf894aecb9b8" rel="nofollow noreferrer">https://gist.github.com/Lightnet/8fb3d4a7c5f3ed2b3865bf894aecb9b8</a></p>
  
  <p>Any way to solve this?</p>