program movebloubs

  use bloubspace
  use povstuff

  implicit none

  character(200)           :: infile, outfile
  integer                  :: inu, outu, errcode, i
  type(t_bloubs)           :: bloub
  double precision         :: bx, by, bz

  i = IARGC()
  if (i .ne. 2) then
    STOP ": BAD ARGS ON COMMAND LINE"
  endif
  call getarg(1, infile)
  call getarg(2, outfile)

  inu  = 42 ;   outu = 51

  write (0, '(A)') &
  "*** moving bloubs from "//trim(infile)//" to "//trim(outfile)

  open(unit=inu,  file=trim(infile), form='unformatted',     &
                  iostat=errcode,                            &
                  action='read', status='old')
  if (0 .ne. errcode) then
    STOP " : CAN'T OPEN FILE " // trim(infile)
  endif

  open(unit=outu, file=trim(outfile), form='unformatted',     &
                  iostat=errcode,                              &
                  action='write', status='replace')
  if (0 .ne. errcode) then
    STOP " : CAN'T WRITE TO " // trim(outfile)
  endif

  bx = 0.0;   by = 0.0;   bz = 0.0

  do
    read (unit=inu, iostat=errcode) bloub
    if (0 .ne. errcode) then
      exit
    endif

    call move_bloub (bloub, 0.333)

    bx = bx + bloub%px
    by = by + bloub%py
    bz = bz + bloub%pz

    ! boundingbox action
    if (0.0 .gt. bloub%py) then
      bloub%vy = -1.0 * bloub%vy
      bloub%py = 0.0
    endif

    write(outu) bloub     ! no error control ?


  enddo



  close(inu)    ;    close(outu)

end program