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105 lines
3.2 KiB
105 lines
3.2 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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INTEGER FUNCTION NZAWAY (NLNKF, LINKF1, XN, YN, ZN, HIDENP)
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C=======================================================================
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C --*** NZAWAY *** (MESH) Determine if warped face is hidden
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C -- Written by Amy Gilkey - revised 05/02/88
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C --
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C --NZAWAY determines how many nodes of a possible warped face
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C --on a 3D surface are hidden. A node is hidden if and only if the
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C --outward normal formed by the node and the two adjacent nodes points
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C --"into" the plotting surface. The nodes are marked as visible if
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C --they point away from the plotting surface.
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C --
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C --Parameters:
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C -- NLNKF - IN - the number of nodes per face
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C -- LINKF1 - IN - the connectivity for the face
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C -- XN, YN, ZN - IN - the nodal coordinates; the Z-coordinate is
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C -- pointing towards the viewer (out of the plotting plane)
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C -- HIDENP - IN/OUT - node status (as in HIDDEN)
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PARAMETER (KNVIS=0, KNFOVR=10, KNHID=100)
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common /debugc/ cdebug
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common /debugn/ idebug
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character*8 cdebug
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INTEGER LINKF1(NLNKF)
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REAL XN(*), YN(*), ZN(*)
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INTEGER HIDENP(*)
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NZAWAY = 0
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IMID = LINKF1(3)
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IRGT = LINKF1(4)
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AX = XN(IRGT) - XN(IMID)
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AY = YN(IRGT) - YN(IMID)
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IF ((AX .NE. 0.0) .OR. (AY .NE. 0.0)) THEN
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ISAME = 0
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ELSE
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IMID = LINKF1(2)
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IRGT = LINKF1(3)
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BX = XN(IRGT) - XN(IMID)
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BY = YN(IRGT) - YN(IMID)
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IMID = LINKF1(3)
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IRGT = LINKF1(4)
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ISAME = IMID
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END IF
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DO 100 ILINK = 1, 4
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IMID = IRGT
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IRGT = LINKF1(ILINK)
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C --Form X and Y components of corner of face
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IF (ISAME .EQ. 0) THEN
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BX = -AX
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BY = -AY
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END IF
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AX = XN(IRGT) - XN(IMID)
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AY = YN(IRGT) - YN(IMID)
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C --Form Z component of normal vector to corner, and make node
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C --visible if normal points forward
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IF ((AX .NE. 0.0) .OR. (AY .NE. 0.0)) THEN
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IF (AX*BY .LE. BX*AY) THEN
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NZAWAY = NZAWAY + 1
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IF (ISAME .NE. 0) NZAWAY = NZAWAY + 1
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ELSE
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IXRGT = ILINK
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HIDENP(IMID) = KNVIS
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IF (ISAME .NE. 0) HIDENP(ISAME) = KNVIS
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END IF
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ISAME = 0
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ELSE
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ISAME = IMID
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END IF
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100 CONTINUE
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IF (NZAWAY .EQ. 1) THEN
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C --If single node visible, make two adjoining nodes visible
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IF (IXRGT .GT. 2) THEN
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IXLFT = IXRGT - 2
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ELSE
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IXLFT = IXRGT + 2
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END IF
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HIDENP(LINKF1(IXLFT)) = KNVIS
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HIDENP(LINKF1(IXRGT)) = KNVIS
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END IF
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if ((nzaway .ne. 4) .and. (nzaway .ne. 0)) then
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if ((cdebug .eq. 'HIDDEN') .and. (idebug .ge. 2))
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& write (*, '(1x,a,i5,2x,4i5)') 'warped', nzaway, linkf1
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end if
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RETURN
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END
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