With the Rendering engineers Marco Alamia and Bruce Wilkie, and the help of Tools engineers Rowan Hamilton and James Farris, we developed a feature called Environment States that will allow you to play Overwatch maps under different lighting or weather conditions. Here is one of the first map that I relighted, Dorado at sunrise.
You can read more about the tech here: https://playoverwatch.com/en-gb/news/23674944/environment-states-in-overwatch-2-behind-the-scenes-with-the-engineering-team/