该代码介绍了基于分形技术实现的天空和云模拟，目前是静态的，作者可以自己添加定时器等操作，来实现动态云的模拟。其中的OpenGL视图已经独立出来，代码易复用。-The code, introduced technology based on fractal simulation of the sky and clouds is currently static, authors can add their own timer and other operations to achieve dyna