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PLNA3

       SUBROUTINE  PLNA3 (XARRAY,INCX,YARRAY,INCY,ZARRAY,INCZ,N)
 C$    (Polyline Absolute 3-D)
 C$    Beginning at the current point, draw line segments to  each
 C$    of the N  points stored in  (XARRAY(*),YARRAY(*),ZARRAY(*))
 C$    in turn, ending at the N-th point which will become the new
 C$    current  position.    INCX,   INCY,  and   INCZ   are   the
 C$    displacements between successive X, Y, and Z values in  the
 C$    arrays.  These will  normally be  all 1.   If an  increment
 C$    INCX, INCY, or  INCZ is  negative, the  starting vertex  is
 C$    taken as (1-N)*INC + 1 instead  of 1, so that the array  is
 C$    stepped through in reverse order.
 C$    (02-APR-82)