s4volume.F

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!||====================================================================
!||    s4volume   ../engine/source/elements/solid/solide4/s4volume.F
!||--- called by ------------------------------------------------------
!||    eloff      ../engine/source/elements/eloff.F
!||    fixflux    ../engine/source/constraints/thermic/fixflux.F
!||====================================================================
      SUBROUTINE s4volume(X, VOL, NEL, NC1, NC2, NC3, NC4)
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 NEL, NC1(*), NC2(*), NC3(*), NC4(*)
C
      my_real
     .   x(3,*),vol(*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I
C                                                                     12
      my_real
     .   x41, y41, z41, x42, y42, z42, x43, y43, z43
      my_real
     .   b1(mvsiz), c1(mvsiz), d1(mvsiz),
     .   x1(mvsiz), x2(mvsiz), x3(mvsiz), x4(mvsiz),
     .   y1(mvsiz), y2(mvsiz), y3(mvsiz), y4(mvsiz),
     .   z1(mvsiz), z2(mvsiz), z3(mvsiz), z4(mvsiz)
C---------------------------------------------------
C     NODAL COORDINATES     
C----------------------------
      DO i=1,nel
        x1(i)=x(1,nc1(i))
        y1(i)=x(2,nc1(i))
        z1(i)=x(3,nc1(i))
        x2(i)=x(1,nc2(i))
        y2(i)=x(2,nc2(i))
        z2(i)=x(3,nc2(i))
        x3(i)=x(1,nc3(i))
        y3(i)=x(2,nc3(i))
        z3(i)=x(3,nc3(i))
        x4(i)=x(1,nc4(i))
        y4(i)=x(2,nc4(i))
        z4(i)=x(3,nc4(i))
      ENDDO
C----------------------------
C     TETRAHEDRON VOLUME
C----------------------------
      DO i=1,nel
        x43 = x4(i) - x3(i)
        y43 = y4(i) - y3(i)
        z43 = z4(i) - z3(i)
        x41 = x4(i) - x1(i)
        y41 = y4(i) - y1(i)
        z41 = z4(i) - z1(i)
        x42 = x4(i) - x2(i)
        y42 = y4(i) - y2(i)
        z42 = z4(i) - z2(i)
C
        b1(i) =  y43*z42 - y42*z43
        c1(i) =  z43*x42 - z42*x43
        d1(i) =  x43*y42 - x42*y43
C
        vol(i)= (x41*b1(i) + y41*c1(i) + z41*d1(i))*one_over_6
      ENDDO
C
      RETURN
      END