var('y z')

(y, z)

implicit_plot3d(-(x^2+y^2+z^2)+cos(5*x)+cos(5*y)+cos(5*z)-0.1,(x,-2,2),(y,-2,2),(z,-2,2),plot_points=100,
                color='lemonchiffon').show(viewer='threejs',online=True,frame=False)