the larger screen, the wider space is projected.
<TT>Viewdistance</TT> which defines the distance between the viewpoint
and the viewplane also concerns with the viewing angle.
The larger viewdistance maps the smaller region to the window on the view plane.
<TT>Hither</TT> and <TT>yon</TT> parameters determine the distance to the front and back
depth clipping planes.
Objects outside these two planes are clipped out.
Actually, this clipping procedure is performed by the viewport object.

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