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SET3D

       SUBROUTINE  SET3D (ON3D)
 C$    (Set 3-D Plotting Mode)
 C$    For  efficiency   reasons,   transformations   from   world
 C$    coordinates to Normalized  Device Coordinates are  normally
 C$    restricted to 2-dimensional.  All of the 3-D primitives  if
 C$    invoked will automatically set for 3-D plotting.   However,
 C$    if 3-D mode is desired while only 2-D primitives are  being
 C$    used, it  must be  explicitly requested.   If this  is  not
 C$    done, the Z coordinate will  be ignored on all calls.   The
 C$    argument is:
 C$
 C$    ON3D...... .TRUE. - turn on 3-D plotting.
 C$              .FALSE. - turn off 3-D plotting.
 C$
 C$    (01-APR-82)