i9imp2.F

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!||====================================================================
!||    i9imp2    ../engine/source/interfaces/int09/i9imp2.F
!||--- called by ------------------------------------------------------
!||    i9main2   ../engine/source/interfaces/int09/i9main2.F
!||====================================================================
      SUBROUTINE i9imp2(X     ,V     ,A     ,IRECT,MSR  ,
     1                  NSV   ,ILOC  ,IRTL  ,NSN  ,CST  ,
     2                  FRIGAP,NOR   )
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 NSN
      INTEGER IRECT(4,*), MSR(*), NSV(*), ILOC(*), IRTL(*)
C     REAL
      my_real
     .   x(3,*), v(3,*), a(3,*), cst(2,*),frigap(*), nor(3,*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "com08_c.inc"
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER IX(2), II, I, J, K, L, M, IMP, I3, I2, JJ, J3, J2, LOLD
C     REAL
      my_real
     .   h(2), n2, n3, gap, ym1, zm1, ym2, zm2, ys, zs, t2, t3,
     .   xl, ans, ss, stif, fni, fyi, fzi, ss0, fti, ds, anst
C-----------------------------------------------
      gap =frigap(2)
C
      DO 500 ii=1,nsn
      i=nsv(ii)
      j=iloc(ii)
      k=msr(j)
      l=irtl(ii)
      m=msr(irect(1,l))
      ix(1)=m
      ym1=x(2,m) + (v(2,m) + a(2,m)*dt12)*dt2
      zm1=x(3,m) + (v(3,m) + a(3,m)*dt12)*dt2
      m=msr(irect(2,l))
      ix(2)=m
      ym2=x(2,m) + (v(2,m) + a(2,m)*dt12)*dt2
      zm2=x(3,m) + (v(3,m) + a(3,m)*dt12)*dt2
      ys =x(2,i) + (v(2,i) + a(2,i)*dt12)*dt2
      zs =x(3,i) + (v(3,i) + a(3,i)*dt12)*dt2
      t2=ym2-ym1
      t3=zm2-zm1
      xl=sqrt(t2**2+t3**2)
      t2=t2/xl
      t3=t3/xl
      n2= t3
      n3=-t2
C
      ans =n2*(ys-ym1)+n3*(zs-zm1)
      ans =ans-gap
      IF(ans>zero)THEN
        iloc(ii)=-iloc(ii)
      ELSE
        h(2)=t2*(ys-ym1)+t3*(zs-zm1)
        h(2)=h(2)/xl
        h(1)=one - h(2)
        ss=h(2)-h(1)
        IF(ss> onep05)iloc(ii)=-iloc(ii)
        IF(ss<-onep05)iloc(ii)=-iloc(ii)
        ss= max(-one,ss)
        ss= min( one,ss)
        nor(2,ii)=n2
        nor(3,ii)=n3
        cst(1,ii)=ss
      ENDIF
C
 500  CONTINUE
      RETURN
      END