PlaneNorm3D.f90

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SUBROUTINE planenorm3d( ax, ay, az, bx, by ,bz, vNorm )

  IMPLICIT NONE

  REAL*8 :: ax, ay, az
  REAL*8 :: bx, by, bz
  REAL*8, DIMENSION(1:3) :: vnorm

  REAL*8 :: vedgex, vedgey, vedgez, xnorm
  
  vedgex = bx - ax
  vedgey = by - ay
  vedgez = bz - az

  xnorm = sqrt(vedgex**2 + vedgey**2 + vedgez**2)

  vnorm(1) = vedgex/xnorm
  vnorm(2) = vedgey/xnorm
  vnorm(3) = vedgez/xnorm

  RETURN
END SUBROUTINE planenorm3d