This is a pore of a pole-truncated regular bipyramid at u/2 height, centered within the unit cell, packed XY-diagonally with other such bipyramids at a Z offset of u/4 between packing layers. Also, the long horizontal edges are omitted.
Orthogonal projection of such lattice in X or Y forms packed oblong hexagons (2u/3 XY corner-to-corner by u/2 Z edge-to-edge); projection in Z forms a truncated-square tiling of 2u/3 octagons and u/3 squares.
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Key
- Solid blue: Topology
- Solid orange: Neighboring bars
- Transparent blue: Unit cell