plot3d_implicit(
    1/x**2 - 1/y**2 + 1/z**2, (x, -2, 2), (y, -2, 2), (z, -2, 2),
    {
        "isomin": 0, "isomax": 2,
        "colorscale":"aggrnyl", "showscale":True
    },
    backend=PB
)