[Python] Why can't I plot 3D graphics with SageMath

I do just the code in reference manual. It doesn't work. Code runs, and pop up a blank figure. It's the same in both local installation ans Cocalc, in the web.

x, y = var('x y')

W = plot3d(sin(pi*((x)^2 + (y)^2))/2, (x, -1, 1), (y, -1, 1),

frame=False, color='purple', opacity=0.8)

S = sphere((0, 0, 0), size=0.3, color='red', aspect_ratio=[1,1,1])

show(W + S, figsize=8)


Just another exemple:

f(x, y) = sin(x*y)

G = plot3d(f, (x, -2, 2), (y, -2, 2))

G.save("graphic3d.html", viewer='threejs', online=True)

print("Graphic saved as graphic3d.html.")


The HTML file saved is also blank. The version is SageMath 10.6. I try to run by the shell, and JupyterLab, and is the same.

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