n2edge3l.F

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!||====================================================================
!||    n2edge3l     ../engine/source/interfaces/int24/n2edge3l.f
!||--- called by ------------------------------------------------------
!||    intersecsh   ../engine/source/interfaces/int24/i24dst3.F
!||====================================================================
        SUBROUTINE n2edge3l(
     1                           XXI    ,YYI      ,ZZI    ,
     2                           XXJ    ,YYJ      ,ZZJ    ,
     3                           NX     ,NY       ,NZ     ,
     4                           XI     ,YI       ,ZI     ,BBB )
C-----------------------------------------------
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
      my_real , INTENT(IN)     :: 
     1                           xxi    ,yyi      ,zzi    ,
     2                           xxj    ,yyj      ,zzj    ,
     3                           nx     ,ny       ,nz     ,
     4                           xi     ,yi       ,zi     
      my_real , INTENT(OUT)    :: bbb
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
        INTEGER I
      my_real
     .     XMIJ(3),NIJ(3),DI(3),AA,NORM
C-----------------------------------------------
             xmij(1)=xxj-xxi
             xmij(2)=yyj-yyi
             xmij(3)=zzj-zzi
             nij(1)= ny*xmij(3) - nz*xmij(2)
             nij(2)= nz*xmij(1) - nx*xmij(3)
             nij(3)= nx*xmij(2) - ny*xmij(1)
             aa = nij(1)*nij(1)+nij(2)*nij(2)+nij(3)*nij(3)
             norm=max(em20,sqrt(aa))
             di(1)=half*(xxi+xxj)-xi
             di(2)=half*(yyi+yyj)-yi
             di(3)=half*(zzi+zzj)-zi
             bbb = (di(1)*nij(1)+di(2)*nij(2)+di(3)*nij(3))/norm
             IF (abs(bbb)<em3) then
               xmij(1)=xxj-xi
               xmij(2)=yyj-yi
               xmij(3)=zzj-zi
               aa = di(1)*xmij(1)+di(2)*xmij(2)+di(3)*xmij(3)
               IF (aa>abs(bbb)) bbb = aa
             END IF
C
      RETURN
      END