title: Perspective Projection in Android in an augmented reality application
body: <p>Currently I'm writing an augmented reality app and I have some problems to get the objects on my screen. It's very frustrating for me that I'm not able to transform gps-points to the correspending screen-points on my android device. I've read many articles and many other posts on stackoverflow (I've already asked similar questions) but I still need your help.</p>
  
  <p>I did the perspective projection which is explained in wikipedia.</p>
  
  <p>What do I have to do with the result of the perspective projection to get the resulting screenpoint?</p>