i12msr3.F

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!||====================================================================
!||    i12msr3           ../engine/source/interfaces/inter3d/i12msr3.F
!||--- called by ------------------------------------------------------
!||    intti12a          ../engine/source/interfaces/interf/intti12.F
!||--- calls      -----------------------------------------------------
!||    i12_nearest_seg   ../engine/source/interfaces/inter3d/i12_nearest_seg.F
!||====================================================================
      SUBROUTINE i12msr3(
     1   XS,      XM,      IRECT,   LMSR,
     2   MSR,     NSV,     ILOC,    IRTL,
     3   NSEG,    LFT,     LLT,     NFT)
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-----------------------------------------------
      INTEGER, INTENT(INOUT) :: LFT
      INTEGER, INTENT(INOUT) :: LLT
      INTEGER, INTENT(INOUT) :: NFT
      INTEGER, INTENT(IN)  :: IRECT(4,*), LMSR(*), MSR(*), NSV(*), ILOC(*), NSEG(*)
      INTEGER, INTENT(INOUT) :: IRTL(*)
      my_real, INTENT(IN)  :: xs(3,*),xm(3,*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, IL, JL, L, JJJ, JJ, J1, J2, LL1, LL2, LL, LG, KKK, KK, K1, K2, M, N
      INTEGER KM1(4), KN1(4), LSEG, LSEG_NEW
      my_real BMIN, BMAX
      DATA km1/2,3,4,1/
      DATA kn1/4,1,2,3/
C-----------------------------------------------
      DO i=lft,llt
        il=i+nft
        jl=iloc(il)
        l=irtl(il)
        bmax=-ep30
        lseg_new=0
 
        IF(l/=0)THEN
          lseg=l
          DO jjj=1,4
            jj=jjj
            IF(irect(jj,l)==jl) EXIT
          ENDDO
          j1=km1(jj)
          j2=kn1(jj)
          IF(jj==3.AND.irect(3,l)==irect(4,l)) j1=1
          m=irect(j1,l)
          n=irect(j2,l)
          CALL i12_nearest_seg(xs, xm, il, jl, m, n, lseg, lseg_new, bmin, bmax)
          IF(bmin >= zero) cycle
        END IF
 
        ll1=nseg(jl)
        ll2=nseg(jl+1)-1
        DO ll=ll1,ll2
          lg=lmsr(ll)
          lseg=lg
          IF(l==lg) cycle
          DO kkk=1,4
            kk=kkk
            IF(irect(kk,lg)==jl) EXIT
          END DO
          k1=km1(kk)
          k2=kn1(kk)
          IF(kk==3.AND.irect(3,lg)==irect(4,lg)) k1=1
          m=irect(k1,lg)
          n=irect(k2,lg)
          CALL i12_nearest_seg(xs, xm, il, jl, m, n, lseg, lseg_new, bmin, bmax)
          IF(bmin < zero) cycle
          irtl(il)=lseg_new
          GO TO 200
        END DO
C
        irtl(il)=lseg_new
 200    CONTINUE
      END DO
 
      RETURN
      END