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217 lines
7.2 KiB
217 lines
7.2 KiB
2 years ago
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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 FIXCUT (CUTPT, CUTNRM, X, Y, Z,
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& LENF, NLNKF, LINKF, IF2EL, IF2EL2, IE2ELB,
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& IFACUT, IELCUT, CLASS, NEWELB)
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C=======================================================================
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C --*** FIXCUT *** (MESH) Cut 3D mesh
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C -- Written by Amy Gilkey - revised 03/04/88
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C -- Revised by Ray J. Meyers, 29 May, 1990
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C modified input from three points plus a logical indicating
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C whether to reverse the implied plane normal (12 values),
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C to input of point on plane and normal of plane (6 values)
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C --
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C --FIXCUT cuts the 3D mesh along a given plane. All faces cut by the
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C --plane or out of the plane on a cut element become surface faces.
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C --Faces that are out of the cut are moved to LENF(NELBLK+3) set.
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C --
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C --Parameters:
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C -- CUTPT - IN - a point on the cutting plane
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C -- CUTNRM - IN - the normal of the cutting plane
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C -- X, Y, Z - IN - the original nodal coordinates
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C -- LENF - IN - the cumulative face counts by element block
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C -- NLNKF - IN - the number of nodes per face
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C -- LINKF - IN - the connectivity for all faces
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C -- IF2EL - IN - the element number of each face
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C -- IF2EL2 - IN - the secondary element number of each face
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C -- IE2ELB - IN - the element block for each element
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C -- IFACUT - SCRATCH - the face status for all faces
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C -- IELCUT - SCRATCH - the element status
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C -- CLASS - SCRATCH - integer array: for each point, the point is
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C -- classified in, out, or on with respect to the
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C cutting plane
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C -- NEWELB - OUT - size = LENF(NELBLK+3)
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C --
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C --Common Variables:
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C -- Uses NUMNP, NELBLK of /DBNUMS/
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PARAMETER (ISIN = +1, ISOUT = -1, ISCUT = 0, ISON = -2, ISSURF=2)
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include 'dbnums.blk'
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COMMON /D3NUMS/ IS3DIM, NNPSUR, NUMNPF, LLNSET
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LOGICAL IS3DIM
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REAL CUTPT(3), CUTNRM(3)
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REAL X(NUMNP), Y(NUMNP), Z(NUMNP)
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INTEGER LENF(0:NELBLK+3)
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INTEGER NLNKF(NELBLK)
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INTEGER LINKF(*)
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INTEGER IF2EL(*), IF2EL2(*)
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INTEGER IE2ELB(NUMEL)
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INTEGER IFACUT(*), IELCUT(NUMEL)
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INTEGER CLASS(NUMNP)
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INTEGER NEWELB(*)
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LOGICAL ON, IN, OUT
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C --Rotate the coordinates to find the z-coordinates
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C DO 100 INP = 1, NUMNP
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C ZC(INP) = X(INP)*CUTMAT(1,3) + Y(INP)*CUTMAT(2,3)
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C & + Z(INP)*CUTMAT(3,3)
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C 100 CONTINUE
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C CLASSIFY EACH POINT AS BEING ISIN, ISOUT, OR ISON
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DO 100 I = 1, NUMNP
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CALL CLASPT( X(I), Y(I), Z(I), CUTPT, CUTNRM, CLASS(I))
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100 CONTINUE
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C --Initialize the element flags
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CALL INIINT (NUMEL, -999, IELCUT)
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DO 140 IELB = 1, NELBLK+3
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IF (IELB .LE. NELBLK) NL = NLNKF(IELB)
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IF (IELB .LE. NELBLK) IXL0 = IDBLNK (IELB, 0, LENF, NLNKF) - 1
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DO 130 IFAC = LENF(IELB-1)+1, LENF(IELB)
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IF (IELB .GT. NELBLK) NL = NLNKF(IE2ELB(IF2EL(IFAC)))
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C --Find out if the surface is in, out, on or cut
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IN = .FALSE.
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OUT = .FALSE.
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ON = .FALSE.
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DO 110 K = 1, NL
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ISTAT = CLASS(LINKF(IXL0+K))
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IF(ISTAT .EQ. ISIN) THEN
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IN = .TRUE.
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ELSE IF(ISTAT .EQ. ISOUT) THEN
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OUT = .TRUE.
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ELSE
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ON = .TRUE.
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END IF
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110 CONTINUE
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IF(IN) THEN
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IF(OUT) THEN
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IFACUT(IFAC) = ISCUT
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ELSE
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IFACUT(IFAC) = ISIN
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END IF
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ELSE IF(OUT) THEN
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IFACUT(IFAC) = ISOUT
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ELSE
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IFACUT(IFAC) = ISON
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END IF
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C ZMIN = ZC(LINKF(IXL0+1))
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C ZMAX = ZC(LINKF(IXL0+1))
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C DO 110 K = 2, NL
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C ZMIN = MIN (ZMIN, ZC(LINKF(IXL0+K)))
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C ZMAX = MAX (ZMAX, ZC(LINKF(IXL0+K)))
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C 110 CONTINUE
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C IF ((ZMAX .EQ. ZCUT) .AND. (ZMIN .EQ. ZMAX)) THEN
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C IFACUT(IFAC) = ISON
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C ELSE IF (ZMAX .LT. ZCUT) THEN
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C IFACUT(IFAC) = ISIN
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C ELSE IF (ZMIN .GT. ZCUT) THEN
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C IFACUT(IFAC) = ISOUT
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C ELSE
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C IFACUT(IFAC) = ISCUT
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C END IF
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C --Set the element flag to in, out, or cut
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DO 120 K = 1, 2
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IF (K .EQ. 1) THEN
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IEL = IF2EL(IFAC)
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ELSE
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IEL = IF2EL2(IFAC)
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END IF
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IF (IEL .GT. 0) THEN
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IF (IELCUT(IEL) .NE. IFACUT(IFAC)) THEN
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IF ((IELCUT(IEL) .LE. -999)
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& .OR. (IFACUT(IFAC) .EQ. ISCUT)) THEN
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IELCUT(IEL) = IFACUT(IFAC)
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ELSE IF (((IELCUT(IEL) .EQ. ISIN)
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& .AND. (IFACUT(IFAC) .EQ. ISON))
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& .OR. ((IELCUT(IEL) .EQ. ISON)
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& .AND. (IFACUT(IFAC) .EQ. ISIN))) THEN
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IELCUT(IEL) = ISCUT
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END IF
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END IF
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END IF
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120 CONTINUE
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IXL0 = IXL0 + NL
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130 CONTINUE
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140 CONTINUE
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DO 160 IELB = 1, NELBLK+3
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DO 150 IFAC = LENF(IELB-1)+1, LENF(IELB)
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IF (IFACUT(IFAC) .EQ. ISOUT) THEN
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C --Change an OUT face to a SURFACE face if it is part of a
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C --CUT element
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IF (IELCUT(IF2EL(IFAC)) .EQ. ISCUT) IFACUT(IFAC) = ISSURF
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IEL = IF2EL2(IFAC)
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IF (IEL .GT. 0) THEN
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IF (IELCUT(IEL) .EQ. ISCUT) IFACUT(IFAC) = ISSURF
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END IF
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ELSE IF (IFACUT(IFAC) .EQ. ISON) THEN
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C --Change an ON face to a SURFACE face
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IFACUT(IFAC) = ISSURF
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ELSE IF (IFACUT(IFAC) .EQ. ISCUT) THEN
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C --Change a CUT face to an IN face
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IFACUT(IFAC) = ISIN
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END IF
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C --Determine the type of the new surface
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IF (IFACUT(IFAC) .EQ. ISIN) THEN
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IF (IF2EL2(IFAC) .LE. 0) THEN
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C --If surface IN face, change to a surface face
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NEWELB(IFAC) = IE2ELB(IF2EL(IFAC))
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ELSE
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C --If interior IN face, change to an interior face
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NEWELB(IFAC) = NELBLK+1
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END IF
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ELSE IF (IFACUT(IFAC) .EQ. ISOUT) THEN
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C --If OUT face, change to an OUT face
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NEWELB(IFAC) = NELBLK+3
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ELSE IF (IFACUT(IFAC) .EQ. ISSURF) THEN
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C --If SURFACE surface face, change to a surface face
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IF (IF2EL2(IFAC) .LE. 0) THEN
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NEWELB(IFAC) = IE2ELB(IF2EL(IFAC))
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ELSE IF (IELCUT(IF2EL2(IFAC)) .EQ. ISOUT) THEN
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NEWELB(IFAC) = IE2ELB(IF2EL(IFAC))
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ELSE
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C --Swap nodes to simulate surface being defined by facing element
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NEWELB(IFAC) = - IE2ELB(IF2EL2(IFAC))
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END IF
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END IF
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150 CONTINUE
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160 CONTINUE
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RETURN
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END
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