voisin1.F

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!||====================================================================
!||    voisin1     ../starter/source/interfaces/inter3d1/voisin1.F
!||--- called by ------------------------------------------------------
!||    removeic1   ../starter/source/interfaces/inter3d1/i24tools.F
!||====================================================================
      SUBROUTINE voisin1(NC1,NC2 ,I1 ,I2 ,INV)
C----6---------------------------------------------------------------7---------8
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
C     REAL
      INTEGER NC1(*),NC2(*),INV,I1 ,I2
C-----------------------------------------------
c FUNCTION: find the same orientation of two segments (4n)
c
c Note:
c ARGUMENTS:  (I: input, O: output, IO: input * output, W: workspace)
c
c TYPE NAME                FUNCTION
c  I   NC1(1:4),NC2(1:4) - connectivity
c  I   I1,I2             - commun nodes of two seg
c  O   INV               - flag : 0 same orientation; 1 inverse one
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I,J,J1,J2
C----------change the method, just look at the connectivity  
        j1=0
        DO i= 1,4
         IF (i1==nc2(i)) j1=i
        END DO
        IF (j1==4) j1=0
        IF (nc2(j1+1)==i2) THEN
          inv = 1
        ELSE
          inv = 0
        END IF 
C----6---------------------------------------------------------------7---------8
      RETURN
      END