How much of a difference does 13 years make when it comes to video game graphics? Quite a lot, if the game in question is Assassin’s Creed Black Flag Resynced. Out this week–alongside plenty of other great games this month–the Black Flag remake’s most obvious upgrade is in its visuals, which have been fine-tuned to take advantage of modern technologies. Ray-traced global illumination, dynamic weather systems, overhauled character models, and continuous geometry refinement all sound fancy on paper, but how does…