Four - prism dual - down brackets for Tsui Kum Ngong face, with Aung roof beam depth of three meters, all really Aung.

四角柱斗拱上为双抄下昂咀琴面，昂屋梁深入屋顶内达三米，全为真昂。

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Also this article puts forward the data structure of point, triangle, side face and tri-prism and builds some topology.

提出了三棱柱的体元构造，详细设计了点、三角形、侧面和三棱柱体的数据结构，建立了一定的拓扑关系。

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