with an even number of plus signs, along with all the odd permutations with an odd number of plus signs, where t≈1.83929 is the tribonacci constant. Taking the even permutations with an odd number of plus signs, and the odd permutations with an even number of plus signs, gives a different snub cube, the mirror image. Taking all of them together yields the compound of two snub cubes.
This snub cube has edges of length , a number which satisfies the equation
and can be written as
To get a snub cube with unit edge length, divide all the coordinates above by the value α given above.
Orthogonal projections
The snub cube has two special orthogonal projections, centered, on two types of faces: triangles, and squares, correspond to the A2 and B2Coxeter planes.
More information Centered by, Face Triangle ...
Orthogonal projections
Centered by
Face Triangle
Face Square
Edge
Solid
Wireframe
Projective symmetry
[3]
[4]+
[2]
Dual
Close
Spherical tiling
The snub cube can also be represented as a spherical tiling, and projected onto the plane via a stereographic projection. This projection is conformal, preserving angles but not areas or lengths. Great circle arcs (geodesics) on the sphere are projected as circular arcs on the plane.
More information Orthographic projection, Stereographic projection ...
Cube, rhombicuboctahedron and snub cube (animated expansion and twisting)
The snub cube can be generated by taking the six faces of the cube, pulling them outward so they no longer touch, then giving them each a small rotation on their centers (all clockwise or all counter-clockwise) until the spaces between can be filled with equilateral triangles.
Uniform alternation of a truncated cuboctahedron
The snub cube can also be derived from the truncated cuboctahedron by the process of alternation. 24 vertices of the truncated cuboctahedron form a polyhedron topologically equivalent to the snub cube; the other 24 form its mirror-image. The resulting polyhedron is vertex-transitive but not uniform.
An "improved" snub cube, with a slightly smaller square face and slightly larger triangular faces compared to Archimedes' uniform snub cube, is useful as a spherical design.[2]
Related polyhedra and tilings
The snub cube is one of a family of uniform polyhedra related to the cube and regular octahedron.
More information Uniform octahedral polyhedra, Symmetry: [4,3], (*432) ...
This semiregular polyhedron is a member of a sequence of snubbed polyhedra and tilings with vertex figure (3.3.3.3.n) and Coxeter–Dynkin diagram. These figures and their duals have (n32) rotational symmetry, being in the Euclidean plane for n=6, and hyperbolic plane for any higher n. The series can be considered to begin with n=2, with one set of faces degenerated into digons.
Jayatilake, Udaya (March 2005). "Calculations on face and vertex regular polyhedra". Mathematical Gazette. 89 (514): 76–81. doi:10.1017/S0025557200176818. S2CID125675814.
Williams, Robert (1979). The Geometrical Foundation of Natural Structure: A Source Book of Design. Dover Publications, Inc. ISBN0-486-23729-X. (Section 3-9)
Cromwell, P. (1997). Polyhedra. United Kingdom: Cambridge. pp.79–86 Archimedean solids. ISBN0-521-55432-2.
This article uses material from the Wikipedia article Snub_cuboctahedron, and is written by contributors.
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