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DEFUP3

       SUBROUTINE  DEFUP3 (DX,DY,DZ)
 C$    (Define 3-D View Up Direction)
 C$    Define  the  view  up  direction  by  specifying  a  vector
 C$    (DX,DY,DZ), measured in world  coordinates relative to  the
 C$    view reference point.  The projection of this vector on the
 C$    view plane will be the up direction, that is, the  positive
 C$    V axis  of  the  left-handed UVW  world  coordinate  system
 C$    defining the view volume.  The V axis will be vertical when
 C$    the view plane is mapped to the view surface.
 C$    (27-JAN-83)