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PLTAM

       SUBROUTINE  PLTAM (U1,U2, V1,V2, W1,W2)
 C$    (Add Mask)
 C$    Add a clipping mask to  the stack.  The rectangular  volume
 C$    contained  in  the  3-D  viewport  and  measured  in  world
 C$    coordinates by  the  coordinate  ranges  (U1,U2),  (V1,V2),
 C$    (W1,W2) will  be  masked  from plotting.   W1  and  W2  are
 C$    measured relative to the view reference point.  Clipping of
 C$    a given coordinate may be  suppressed by setting the  range
 C$    to  0.   For  example,  setting  W1  =  W2  will   suppress
 C$    W-clipping.
 C$    (01-FEB-82)