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DEFTR

       SUBROUTINE  DEFTR (T)
 C$    (Set Transformation)
 C$    Given  the  current   viewing  parameters,  determine   the
 C$    complete   transformation   from   world   coordinates   to
 C$    Normalized Device  Coordinate  space.   The  transformation
 C$    matrix is made up of three 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$    (19-JUL-86)