Computer Science – Computational Geometry
Scientific paper
1999-08-03
Computational Geometry: Theory and Applications 24(2):51-62, February 2003
Computer Science
Computational Geometry
14 pages, 9 figures, LaTeX 2e. To appear in Computational Geometry: Theory and Applications. Major revision with two new autho
Scientific paper
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.
Bern Marshall
Demaine Erik D.
Eppstein David
Kuo Eric
Mantler Andrea
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