title: Ray picking in first person
body: <p>Hi :)
  I have been searching for weeks and can't find a solution.
  Can sum1 please tell me how to implement ray picking when using a first person camera.
  Where exactly in the formula are you suppossed to include the camera's direction??
  If anyone has any solution or working coding of this please comment</p>
  
  <p>Thank you very much</p>