给定不同的递归深度，通过使用海绵算法，绘制Sierpinski地毯，在三维环境中按照画家算法绘制20个小立方体-Given the different recursion depth, by using the sponge method, drawing Sierpinski carpet, in the three-dimensional environment, according to Painter' s algorithm draw 20 small cubes

画家算法也叫作优先填充，它是三维计算机图形学中处理可见性问题的一种解决方法。-Painter algorithm also known as priority fill, it is a solution to deal with the visibility problem in 3D computer graphics.