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This site provides the official documentation for the award-winning UE3 Unreal Development Kit (UDK), and its predecessor the Unreal Engine 2. UE3 was the leading engine of the previous generation, but has been improved upon by the 虚幻引擎 4 技术. Teams who are already developing with UE3 are welcome to continue development and utilize the information provided here; however for new projects, we recommend UE4. International developers may experience better speeds by visiting our East Asian mirror sites for 中国, 日本, and 韩国.