I assume you mean modern cities? NMS has had settlements for a long time now. What kind of computer would be required to even generate and render 18 billion pla

I assume you mean modern cities? NMS has had settlements for a long time now. What kind of computer would be required to even generate and render 18 billion planets with 3-5 actual cities per planet? Most open world/sandbox games are challenged just to have several large cities in a game.