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DEFVD

       SUBROUTINE  DEFVD (DIST)
 C$    (View Distance)
 C$    Specify the  distance  of  the view  plane  from  the  View
 C$    Reference  Point.   The  distance  is  measured  in   world
 C$    coordinate units, and positive values are in the  direction
 C$    of the  View  Plane  Normal  which  points  from  the  View
 C$    Reference Point to the view plane.
 C$    (03-APR-82)