This text provides readers with an in-depth exploration of 3D game engine architecture. The book covers state-of- the-art software architecture principles in the context of game engine design, investigates the subsystems typically found in a real production game engine, surveys engine architectures from actual shipping games, and explores how the differences between game genres can affect engine design. A course based on this text will give students the tools and background to work together like a real game development team to design and build their own functional game engine, both by designing and implementing engine subsystems and by integrating 3rd party components. Topics covered include large-scale C++ software architecture in a games context; engine subsystems including rendering, audio, collision, physics and game world models; multi-player engines; tools pipelines for modern games.