title: translation data from ARtoolkit marker
body: <p>How would you obtain the translational data from a marker using ARToolKit? </p>
  
  <p>I know that ARToolkit can give you the transformation matrix, but I'm having difficulty getting the translational movement. </p>
  
  <p>For example, when I move the marker to the right, the object that I draw on the screen will also move to the right. However, I don't want to draw the object on the marker, since it will be rendered in a scene using OpenSceneGraph. The purpose is to try to create a virtual environment, and interact with it without using too much keyboard interaction. Of course, the marker data would be obtained through a webcam. </p>