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SETVN

       SUBROUTINE  SETVN (DX,DY,DZ)
 C$    (View Plane Normal)
 C$    Define  the  view  plane  normal  as  a  vector  (DX,DY,DZ)
 C$    measured in  world  coordinates  from  the  view  reference
 C$    point.
 C$    (27-JAN-83)