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PLTBX3

       SUBROUTINE  PLTBX3 (X1,X2, Y1,Y2, Z1,Z2, T)
 C$    (3-D Box)
 C$    Draw a  3-D box  defined by  the world  coordinate  extents
 C$    (X1,X2), (Y1,Y2), (Z1,Z2).   The 4-D transformation  matrix
 C$    T(*,*) will be used to provide a temporary world-coordinate
 C$    modelling matrix.   If  a  unit matrix  is  provided,  with
 C$    appropriate choices  of  the coordinate  extents,  the  3-D
 C$    viewport may be boxed.
 C$    (04-FEB-82)