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For a treatment after creating the plot, there is now "add_condition"

          x,y,z = var('x,y,z')
          P = implicit_plot3d(z-x*y,(-2,2),(-2,2),(-2,2))
          def condi(x,y,z):
              return bool(x*x+y*y+z*z <= Integer(1))
          P.add_condition(condi,8)