说明：  ?OpenSceneGraph (简称OSG)使用 OpenGL 技术开发，是一套基于 C++ 平台的 应用程序接口 (API)，它让程序员能够更加快速、便捷地创建高性能、跨平台的交互式图形程序。. 它作为中间件 (middleware)为应用软件提供了各种高级 渲染 特性，IO，以及空间结构组织函数;而更低层次的OpenGL 硬件抽象层 (HAL)实现了底层硬件显示的驱动。
(OpenSceneGraph (OSG) is developed with OpenGL technology. It is a set of application program interface (API) based on C + + platform. It allows programmers to create high-performance, cross platform interactive graphics programs more quickly and conveniently. As a middleware, it provides various advanced rendering features, IO, and spatial structure organization functions for application software, while the lower level OpenGL hardware abstraction layer (HAL) implements the driver of the underlying hardware display.)