To maybe add a more comprehendible example for all the non IT non math non physics folks. Think if a way to simulate a circle with n steps. Put n to 3 and you will get triangle, not very circle like, is it? Now expand the conept to a set of point constantly in motion. The more precision you put in the calculation heavy it gets. Exponentially. And its not like you move the slider to the middle you get half ugly half precise. You ll get most likely a 3/4 ugly 1/4 precise goo for an ocean.