Not necessarily. You could just model the world/universe, and provide high enough resolution only when needed, just like in a game. On the other hand, you coul

Not necessarily. You could just model the world/universe, and provide high enough resolution only when needed, just like in a game. On the other hand, you could also truly simulate each particle and molecule and then let higher-order phenomena emerge from that. For example, the universe might be an immense cellular automata.