reminded me of this other tutorial: https://www.redblobgames.com/articles/visibility/ https://www.redblobgames.com/articles/visibility/ it's been around for a

reminded me of this other tutorial: https://www.redblobgames.com/articles/visibility/ https://www.redblobgames.com/articles/visibility/ it's been around for a while now, 2012 I guess