Truncated Rhombicuboctahedron Bead
Description
A truncated rhombicuboctahedron as a hollowed out bead. https://en.wikipedia.org/wiki/Truncated_rhombicuboctahedron This convex polyhedron is special in that it features all the main crystallographic planes 100, 110, and 111. Plus the 211 planes that lie between adjacent 111 planes. This body came up when investigating nodes for frame systems. For an octet-truss the 111 faces (blue in the image) are the relevant faces since these are the faces that are normal to truss rods. The 111 faces (yellow) point to the tetrahedral voids in the truss (threefold symmetric). The 100 faces point to the octahedral voids in the truss (fourfold symmetric). The odd 211 faces are relevant because these are the ones lying in the angular centre between any two adjacent 111 faces.
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