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43 lines
1.0 KiB
43 lines
1.0 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE PLTCP3(N,MASK,PX,PY,PZ,V,Q)
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DIMENSION MASK(*),PX(*),PY(*),PZ(*),V(*),Q(*)
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include 'izbit.inc'
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J = 0
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KM = 0
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2060 IF (.NOT. (J.LT.N)) GO TO 2070
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JN = MIN(N-J,32)
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KM = 1 + KM
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J1 = J
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J = J + JN
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M = MASK(KM)
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IF (M.EQ.0) THEN
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GO TO 2060
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END IF
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DO 2080 K = 1,JN
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JB = IZBIT(K)
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IF (IAND(M,JB).NE.0) THEN
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FP = (PX(J1+K)-V(1))*Q(1) + (PY(J1+K)-V(2))*Q(2) +
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* (PZ(J1+K)-V(3))*Q(3)
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IF (FP.LT.0.) THEN
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M = IAND(M,NOT(JB))
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END IF
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END IF
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2080 CONTINUE
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MASK(KM) = M
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GO TO 2060
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2070 CONTINUE
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RETURN
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END
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