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answered 2020-05-22 09:25:31 +0100
Like this
sage: var('x,y,z') (x, y, z) sage: P = plot3d(2 + sin(x) + cos(y), (x,-1,1), (y,-1,1)) sage: def condition(x,y,z): ....: return bool(x*x<y) sage: P.add_condition(condition)