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This book is a concise introduction to OpenSceneGraph (OSG)—the open source, cross-platform scene graph application programmer interface (API). OSG plays a key role in the 3D application software stack. It's the middleware above the lower-level OpenGL hardware abstraction layer (HAL), providing extensive higher-level rendering, I/O, and spatial organization functionality to the 3D application. This edition was translated into Chinese by Wang Rui with proofreading and editing by Dr. Qian Xuelei.