title: OpenGL 2d get x,y coordinates android
body: <p>If I have a point at <code>-3f, 3f, 0.0f</code> in OpenGL
  and I do <code>gl.glTranslatef(0.0f, 0.0f, -6.0f)</code>
  then I draw the object.  Where will that point be drawn at in x,y screen coordinates? 
  (screen width = 800 , height = 480).</p>