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answered 7 years ago
Use the new 3D viewer threejs:
threejs
sage: x, y = var('x,y') sage: plot3d(x^2 + y^2, (x,-2,2), (y,-2,2), viewer='threejs')
It is faster and better than Jmol; it does not rely on Java and hopefully should become Sage's default 3D viewer.