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C $Id: pltmp3.f,v 1.3 1993/07/19 17:06:40 gdsjaar Exp $
C $Log: pltmp3.f,v $
C Revision 1.3  1993/07/19 17:06:40  gdsjaar
C Changed hex constants back to preceding X, --needed on cray. Works
C either way on other systems.
C
c Revision 1.2  1993/07/16  17:33:17  gdsjaar
c Integer constant too big on sun, replaced it with hexadecimal notation
c
c Revision 1.1  1993/07/16  16:48:56  gdsjaar
c Changed plt to library rather than single source file.
c
C=======================================================================
      SUBROUTINE PLTMP3(UMAP,N,MASK,PX,PY,PZ,QX,QY)
      DIMENSION UMAP(*),MASK(*),PX(*),PY(*),PZ(*),QX(*),QY(*)
      DIMENSION Q1(3),V1(3),Q2(3),V2(3),TPX(32),TPY(32)
      INTEGER IZBIT(32)
      DATA IZBIT/1,          2,          4,          8,
     *          16,         32,         64,        128,
     *         256,        512,       1024,       2048,
     *        4096,       8192,      16384,      32768,
     *       65536,     131072,     262144,     524288,
     *     1048576,    2097152,    4194304,    8388608,
     *    16777216,   33554432,   67108864,  134217728,
     *   268435456,  536870912, 1073741824, X'80000000'/

      DO 2060 L = 1,3
         V1(L) = UMAP(18+L-1) + UMAP(15)*UMAP(27+L-1)
         Q1(L) = UMAP(L+27-1)
         V2(L) = UMAP(18+L-1) + UMAP(16)*UMAP(27+L-1)
         Q2(L) = -UMAP(L+27-1)
 2060 CONTINUE
      J = 0
      KM = 0
 2080 IF (.NOT. (J.LT.N)) GO TO 2090
      JN = MIN(N-J,32)
      J1 = J + 1
      J = J + JN
      KM = KM + 1
      CALL PLTCP3(JN,MASK(KM),PX(J1),PY(J1),PZ(J1),V1,Q1)
      CALL PLTCP3(JN,MASK(KM),PX(J1),PY(J1),PZ(J1),V2,Q2)
      IF (UMAP(17).EQ.1.) THEN
         M = MASK(KM)
         DO 2100 K = 1,JN
            JB = IZBIT(K)
            IF (IAND(JB,M).NE.0) THEN
               PMS = (PX(K+J1-1)-UMAP(18))*UMAP(27) +
     *               (PY(K+J1-1)-UMAP(19))*UMAP(28) +
     *               (PZ(K+J1-1)-UMAP(20))*UMAP(29)
               R = UMAP(30)/PMS
               TPX(K) = R* ((PX(K+J1-1)-UMAP(18))*UMAP(21)+
     *                  (PY(K+J1-1)-UMAP(19))*UMAP(22)+
     *                  (PZ(K+J1-1)-UMAP(20))*UMAP(23))
               TPY(K) = R* ((PX(K+J1-1)-UMAP(18))*UMAP(24)+
     *                  (PY(K+J1-1)-UMAP(19))*UMAP(25)+
     *                  (PZ(K+J1-1)-UMAP(20))*UMAP(26))
            END IF

 2100    CONTINUE
      END IF

      IF (UMAP(17).EQ.-1.) THEN
      END IF

      CALL PLTMP2(UMAP(1),JN,MASK(KM),TPX,TPY,QX(J1),QY(J1))
      GO TO 2080

 2090 CONTINUE
      RETURN

      END
