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SETTR

       SUBROUTINE  SETTR
 C$    (Set Transformation)
 C$    Given  the  current   viewing  parameters,  determine   the
 C$    complete  transformation  from  world  coordinates  to  NDC
 C$    space.  The  transformation  matrix  is made  up  of  three
 C$    parts:
 C$
 C$    T = T1*T2*T3
 C$
 C$    T1 = world coordinate modelling matrix.
 C$    T2 = mapping   from   world  coordinates  (X,Y,Z)  to world
 C$         coordinates (U,V,W) in the selected viewing volume.
 C$    T3 = mapping   from   viewing   volume  in  (U,V,W)   world
 C$         coordinates to  the 3-D  Normalized Device  Coordinate
 C$         viewport.
 C$    (09-AUG-85)