自己做的GIS3维模型设计，喜欢搞3D的朋友可以好好参考下了-do for myself GIS3 dimensional model design, the likes of 3D can make reference to a friend under the

个人的抽象工厂模型Demo适合初学者学习参考，简单的快速理解抽象工厂定义。-Personal Demo of the abstract factory model reference for beginners to learn, simple to understand the rapid definition of the abstract factory.