Disrupt

The Disrupt game engine was developed by Ubisoft Montreal and is used for the Watch Dogs games. Developer Ubisoft Montreal spent four years creating the engine. The majority of Disrupt was built from scratch and uses a multithreaded renderer, running on fully deferred physically based rendering pipeline with some technological twists to allow for more advanced effects. The engine also has a feature that allows players to seamlessly connect and disconnect their game from others without causing major disruptions in the game environment or storyline progress. Its open world city management comes from AnvilNext while its vegetation and AI are from Dunia. Parts of the engine were originally intended for another game in the Driver franchise.