Paper by Erik D. Demaine

Marshall Bern, Erik D. Demaine, David Eppstein, Eric Kuo, Andrea Mantler, and Jack Snoeyink, “Ununfoldable Polyhedra with Convex Faces”, Computational Geometry: Theory and Applications, volume 24, number 2, February 2003, pages 51–62. Special issue of selected papers from the 4th CGC Workshop on Computational Geometry, 1999.

Unfolding a convex polyhedron into a simple planar polygon is a well-studied problem. In this paper, we study the limits of unfoldability by studying nonconvex polyhedra with the same combinatorial structure as convex polyhedra. In particular, we give two examples of polyhedra, one with 24 convex faces and one with 36 triangular faces, that cannot be unfolded by cutting along edges. We further show that such a polyhedron can indeed be unfolded if cuts are allowed to cross faces. Finally, we prove that “open” polyhedra with triangular faces may not be unfoldable no matter how they are cut.

This paper is also available as arXiv:cs.CG/9908003 of the Computing Research Repository (CoRR).

The paper is 14 pages.

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Related papers:
CGC99 (Ununfoldable Polyhedra with Triangular Faces)
CCCG99b (Ununfoldable Polyhedra)

See also other papers by Erik Demaine.
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Last updated July 25, 2017 by Erik Demaine.