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Cumulation (the dual operation to truncation) replaces the faces of a polyhedron with pyramids, such that the base of each pyramid is a face of the polyhedron and each pyramid has a height that is positive, zero, or negative. This example lets you experiment with cumulation of Platonic and Archimedean solids. You can vary the opacity of the surface of the polyhedron.
Contributed by: Eric W. Weisstein (June 2008)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: June 16 2008