def get_height_of_objects(tet_file):
    """Return the height of the test object."""
    mesh_lines = list(open(tet_file, "r"))
    mesh_lines = [line.strip('\n') for line in mesh_lines]
    zs = []
    for ml in mesh_lines:
        sp = ml.split(" ")
        if sp[0] == 'v':
            zs.append(float(sp[3]))
    return 2 * abs(min(zs))