graphics(
    implicit_3d(1/x**2 - 1/y**2 + 1/z**2,
        (x, -2, 2), (y, -2, 2), (z, -2, 2),
        rendering_kw={
            "isomin": 0, "isomax": 2,
            "colorscale":"aggrnyl", "showscale":True
        }),
    backend=PB
)