实现了光源的移动，而且对于场景中的物体，有属于自己的独立移动，我想对于双缓存和光照模型的初学者来说，会有不错的效果。-To achieve the light source moves, but also for objects in the scene, have their own independent movement, I would like to double the cache and the illumination model for the beginners, there