说明：  OpenGL使人们进入三维图形世界 　　我们生活在一个充满三维物体的三维世界中，为了使计算机能精确地再现这些物体，我们必须能在三维空间描绘这些物体。我们又生活在一个充满信息的世界中，能否尽快地理解并运用这些信息将直接影响事业的成败，所以我们需要用一种最直接的形式来表示这些信息。
(OpenGL make it into the three-dimensional graphics in the world we live in a full three-dimensional objects in three-dimensional world, in order to enable the computer to accurately reproduce these objects, we must be able to describe these objects in three-dimensional space. We also live in a world full of information, the ability to understand and use them as soon as possible information will directly affect the success or failure of the cause, so we need to use one of the most direct way to represent this information.)