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!              ||     ||   //==\\   ||  ||   //==||  ||/==\\                   |
!              ||     ||  ||    ||  ||  ||  ||   ||  ||    ||                  |
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!              ||===//     \\==//    \\==\\  \\==\\  ||                        |
!                                                                              |
!------------------------------------------------------------------------------|
!------------------------------------------------------------------------------|
!                                                                              |
!              ROUTINE    Nov. 2006                                            |
!                                                                              |
!------------------------------------------------------------------------------|
!------------------------------------------------------------------------------|

subroutine interpolate_velocity_on_surface (params,surface,ov)

use definitions

implicit none

!------------------------------------------------------------------------------|
!(((((((((((((((( Purpose of the routine  ))))))))))))))))))))))))))))))))))))))
!------------------------------------------------------------------------------|

!------------------------------------------------------------------------------|
!((((((((((((((((  declaration of the subroutine arguments  ))))))))))))))))))))
!------------------------------------------------------------------------------|

type(parameters) params
type(sheet) surface(params%ns)
type (octreev) ov

!------------------------------------------------------------------------------|
!(((((((((((((((( declaration of the subroutine internal variables )))))))))))))
!------------------------------------------------------------------------------|
integer iproc,nproc,ierr
integer is,err,i
double precision, dimension(:), allocatable :: ubuf,vbuf,wbuf
double precision xi,yi,zi,u,v,w

!-------------------------------------------------------------------------------
!-------------------------------------------------------------------------------

INCLUDE 'mpif.h'
      
call mpi_comm_size (mpi_comm_world,nproc,ierr)
call mpi_comm_rank (mpi_comm_world,iproc,ierr)

do is=1,params%ns
   allocate (ubuf(surface(is)%nsurface),stat=err)  ; if (err.ne.0) call stop_run ('Error alloc xbuf  in move_surface$')
   allocate (vbuf(surface(is)%nsurface),stat=err)  ; if (err.ne.0) call stop_run ('Error alloc ybuf  in move_surface$')
   allocate (wbuf(surface(is)%nsurface),stat=err)  ; if (err.ne.0) call stop_run ('Error alloc zbuf  in move_surface$')

   ubuf=0.d0
   vbuf=0.d0
   wbuf=0.d0
 
   do i=iproc+1,surface(is)%nsurface,nproc

      xi=surface(is)%x(i)
      yi=surface(is)%y(i)
      zi=surface(is)%z(i)

      call octree_interpolate_many (3,ov%octree,ov%noctree,ov%icon,ov%nleaves, &
                                    ov%nnode,xi,yi,zi,ov%unode,u,ov%vnode,v,ov%wnode,w)
!      call octree_interpolate3 (ov%octree,ov%noctree,ov%icon,ov%nleaves,ov%unode,ov%x,ov%y,ov%z,ov%nnode,xi,yi,zi,u)
!      call octree_interpolate3 (ov%octree,ov%noctree,ov%icon,ov%nleaves,ov%vnode,ov%x,ov%y,ov%z,ov%nnode,xi,yi,zi,v)
!      call octree_interpolate3 (ov%octree,ov%noctree,ov%icon,ov%nleaves,ov%wnode,ov%x,ov%y,ov%z,ov%nnode,xi,yi,zi,w)

      ubuf(i)=u
      vbuf(i)=v
      wbuf(i)=w

   end do

   surface(is)%u=0.d0
   surface(is)%v=0.d0
   surface(is)%w=0.d0
   call mpi_allreduce (ubuf,surface(is)%u,surface(is)%nsurface,mpi_double_precision,mpi_sum,mpi_comm_world,ierr)
   call mpi_allreduce (vbuf,surface(is)%v,surface(is)%nsurface,mpi_double_precision,mpi_sum,mpi_comm_world,ierr)
   call mpi_allreduce (wbuf,surface(is)%w,surface(is)%nsurface,mpi_double_precision,mpi_sum,mpi_comm_world,ierr)

   deallocate(ubuf)
   deallocate(vbuf)
   deallocate(wbuf)
end do


return
end subroutine interpolate_velocity_on_surface
!-------------------------------------------------------------------------------
!-------------------------------------------------------------------------------