title: What does Up Vector exactly do in DirectX?
body: <p>As you know when we want to draw a three demensional object in DirectX we should define
  a camera. Now we have a Device object that it's name is 'device1'.it is my question :
   device1.View = Matrix.Look...(New Vector3(),New Vector3(),New Vector3());
  Argument #3 is Up Vector. What does it exactly do?</p>