An object in world coordinate space, whose vertices
are 
can be expressed in term of
view coordinates 
.
- Translate the view reference point e to the origin
- Rotate about world coordinate y axis to bring the view
coordinate
axis into the yz plane of world coordinates
- Rotate about the world coordinate x axis until the z axes
of both systems are aligned
- Rotate about the world coordinate z axis to align the
axis with the y
- Reflect relative to the xy plane, reversing sign of each z
coordinate to change into a left-handed coordinate system
The viewing transformation is
From P. Asokarathinam -- see details
27.11.1996