Apollonian sphere packing

Apollonian sphere packing is the three-dimensional equivalent of the Apollonian gasket. The principle of construction is very similar: with any four spheres that are cotangent to each other, it is then possible to construct two more spheres that are cotangent to four of them, resulting in an infinite sphere packing.

The fractal dimension is approximately 2.473946 (±1 in the last digit).^[1]

ApolFrac is software for generating and visualization of Apollonian sphere packing.^[2]

References

^ Borkovec, M.; De Paris, W.; Peikert, R. (1994), "The Fractal Dimension of the Apollonian Sphere Packing" (PDF), Fractals, vol. 2, no. 4, pp. 521–526, CiteSeerX 10.1.1.127.4067, doi:10.1142/S0218348X94000739, archived from the original (PDF) on 2016-05-06, retrieved 2008-09-15
^ ApolFrac

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[1] Borkovec, M.; De Paris, W.; Peikert, R. (1994), "The Fractal Dimension of the Apollonian Sphere Packing" (PDF), Fractals, vol. 2, no. 4, pp. 521–526, CiteSeerX 10.1.1.127.4067, doi:10.1142/S0218348X94000739, archived from the original (PDF) on 2016-05-06, retrieved 2008-09-15

[2] ApolFrac

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v t e Packing problems
Abstract packing	Bin Set
Circle packing	In a circle / equilateral triangle / isosceles right triangle / square Apollonian gasket Circle packing theorem Tammes problem (on sphere)
Sphere packing	Apollonian Finite In a sphere In a cube In a cylinder Close-packing Kissing number Sphere-packing (Hamming) bound
Other 2-D packing	Square packing
Other 3-D packing	Tetrahedron Ellipsoid
Puzzles	Conway Slothouber–Graatsma