def METHOD_NAME():
    """
    Check volume change of the mesh which is deformed using
    the SplineBox functions.
    """
    from sfepy.discrete.fem import Mesh
    from sfepy.mesh.splinebox import SplineBox
    mesh = Mesh.from_file(data_dir + '/meshes/3d/cylinder.vtk')
    conn = mesh.get_conn('3_4')
    vol0 = tetravolume(conn, mesh.coors)
    bbox = nm.array(mesh.get_bounding_box()).T
    spbox = SplineBox(bbox, mesh.coors)
    cpoints0 = spbox.get_control_points(init=True)
    for ii in range(4):
        for jj in range(4):
            spbox.move_control_point((0, ii, jj), [-0.02, 0, 0])
    coors = spbox.evaluate()
    vol1 = tetravolume(conn, coors)
    mesh.coors[:] = coors
    spbox.set_control_points(cpoints0)
    coors = spbox.evaluate()
    vol2 = tetravolume(conn, coors)
    ok = True
    actual_volumes = (vol0, vol1, vol2)
    expected_volumes = (1.22460186e-4, 1.46950423e-4, 1.22460186e-4)
    for ii in range(3):
        relerr = abs(actual_volumes[ii] - expected_volumes[ii])\
                 / expected_volumes[ii]
        ok = ok and (relerr < tolerance)
    if not ok:
        tst.report('expected volumes:')
        tst.report(expected_volumes)
        tst.report('actual volumes:')
        tst.report(actual_volumes)
    assert ok