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Unity bosses sold stock days before development fees announcement
(www.eurogamer.net)
This is a most excellent place for technology news and articles.
Now I am confused what a game engine even does? I thought it was a type of rendering software, shouldn't all of them do 3D?
There is a lot more to a game engine than just graphics, although that's an important piece of the puzzle.
Input, sound, physics, networking, collision detection, path finding, scripting...etc are all important parts that are handled by the engine.