Create a cube by either specifying the center and side lengths or just
    the bounds of the cube. If ``bounds`` are given, all other arguments are
    ignored.

    Parameters
    ----------
    center : np.ndarray or list
        Center in [x, y, z].

    x_length : float
        length of the cube in the x-direction.

    y_length : float
        length of the cube in the y-direction.

    z_length : float
        length of the cube in the z-direction.

    bounds : np.ndarray or list
        Specify the bounding box of the cube. If given, all other arguments are
        ignored. ``(xMin,xMax, yMin,yMax, zMin,zMax)``

def Cube(center=(0., 0., 0.), x_length=1.0, y_length=1.0, z_length=1.0, bounds=None):
    """Create a cube by either specifying the center and side lengths or just
    the bounds of the cube. If ``bounds`` are given, all other arguments are
    ignored.

    Parameters
    ----------
    center : np.ndarray or list
        Center in [x, y, z].

    x_length : float
        length of the cube in the x-direction.

    y_length : float
        length of the cube in the y-direction.

    z_length : float
        length of the cube in the z-direction.

    bounds : np.ndarray or list
        Specify the bounding box of the cube. If given, all other arguments are
        ignored. ``(xMin,xMax, yMin,yMax, zMin,zMax)``
    """
    src = vtk.vtkCubeSource()
    if bounds is not None:
        if np.array(bounds).size != 6:
            raise TypeError('Bounds must be given as length 6 tuple: (xMin,xMax, yMin,yMax, zMin,zMax)')
        src.SetBounds(bounds)
    else:
        src.SetCenter(center)
        src.SetXLength(x_length)
        src.SetYLength(y_length)
        src.SetZLength(z_length)
    src.Update()
    return vtki.wrap(src.GetOutput())