表面分割是延伸所有s线，形成空间分割。
表面分割（s-空间）
Sources
Peponis, J., Wineman, J., Rashid, M., Hong Kim, S., Barna, S., (1997) On the description of shape and spatial configuration inside buildings: convex partitions and their local properties, Environment and Planning B, Vol 24, 761-781. pp.767-768.