i3msr3.F

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!||====================================================================
!||    i3msr3        ../engine/source/interfaces/inter3d/i3msr3.F
!||--- called by ------------------------------------------------------
!||    i6main        ../engine/source/interfaces/inter3d/i6main.F
!||    i9main3       ../engine/source/interfaces/int09/i9main3.F
!||    intvo3        ../engine/source/interfaces/inter3d/intvo3.F
!||--- calls      -----------------------------------------------------
!||    nearest_seg   ../common_source/interf/nearest_seg.F
!||====================================================================
      SUBROUTINE i3msr3(
     1   X,       IRECT,   LMSR,    MSR,
     2   NSV,     ILOC,    IRTL,    NSEG,
     3   XFACE,   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   G l o b a l   P a r a m e t e r s
C-----------------------------------------------
#include      "mvsiz_p.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, DIMENSION(MVSIZ), INTENT(IN) ::  xface
      my_real, INTENT(IN)  ::  x(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, IG, JG, 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
        ig=nsv(il)
        jl=iloc(il)
        jg=msr(jl)
        l=irtl(il)
        IF(xface(i)==zero)THEN
         irtl(il)=max(l,1)
        ELSE
         bmax=-ep30
         lseg_new=0
C
         IF(l==0) GOTO 100
         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=msr(irect(j1,l))
         n=msr(irect(j2,l))
         CALL nearest_seg(x, ig, jg, m, n, lseg, lseg_new, bmin, bmax)
         IF(bmin >= zero) GO TO 200
C
 100     CONTINUE
         ll1=nseg(jl)
         ll2=nseg(jl+1)-1
         DO ll=ll1,ll2
           lg=lmsr(ll)
           lseg=lg
           IF(l==lg) cycle
           DO jjj=1,4
             jj=jjj
             IF(irect(jj,lg)==jl) EXIT
           ENDDO
           j1=km1(jj)
           j2=kn1(jj)
           IF(jj==3.AND.irect(3,lg)==irect(4,lg)) j1=1
           m=msr(irect(j1,lg))
           n=msr(irect(j2,lg))
           CALL nearest_seg(x, ig, jg, m, n, lseg, lseg_new, bmin, bmax)
           IF(bmin < zero) cycle
           irtl(il)=lseg_new
           GO TO 200
         ENDDO  !LL=LL1,LL2
C
         irtl(il)=lseg_new
 200     CONTINUE
        ENDIF
      ENDDO !I=LFT,LLT
C
      RETURN
      END