一个OPENGL演示的例子，例子中的场景包含运动的云、流动的水、室外山地、雾状效果以及灯光效果，而且该例子是一个标准的OPENGL框架。-a demonstration of OpenGL examples, examples include scenes of cloud movement, the movement of water, outdoor mountain mist effects, and lighting effects, but the example is a stand