The Display type exposes the following members.
This is the horizontal vector (X local) of the display in the global reference system - usually (1,0,0)
This is the perpendicular unit vector to the display
This is the position of the center of the display in the global reference system - usually (0,0,0)
it is the size of the OpenGL control in milimeters. It is constant thru all the application time
it is the pan [mm]
it is the paralax: it´s positive in front of the screen [mm]
it is the zoom [present display/constant display]