The Sims 4 doesn’t use Unreal Engine. Instead, EA and Maxis made their own custom engine for the game. All the Sims games have used this custom engine.
The Sims 4 uses a proprietary game engine called SmartSim. This engine was created specifically for The Sims 4 to support its unique features and gameplay.
This isn’t a general-purpose engine that you can use for any other games. It was made specifically for the Sims, so you can’t really download it or reuse it for other games.
The SmartSim engine supports advanced simulation and AI, which manage the complex behaviors and interactions of Sims in the game. It supports the game’s dynamic and responsive world.
SmartSim supports various graphical improvements and features, including improved lighting and shadow effects. However, it is still designed to be compatible with a range of hardware, including low-spec computers.
SmartSim is designed to handle frequent updates and patches, ensuring that the game can be continually improved and refined.