Optimally cutting a surface into a disk
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We consider the problem of cutting a set of edges on a polyhedral manifold surface, possibly with boundary, to obtain a single topological disk, minimizing either the total number of cut edges or their total length. We show that this problem is NP-hard, even for manifolds without boundary and for punctured spheres. We also describe an algorithm with running time n^{O(g+k)}, where n is the combinatorial complexity, g is the genus, and k is the number of boundary components of the input surface. Finally, we describe a greedy algorithm that outputs a O(log^2 g)-approximation of the minimum cut graph in O(g^2 n log n) time.
24 pages, 6 figures; full version of SOCG 2002 paper; see also http://www.cs.uiuc.edu/~jeffe/pubs/schema.html
24 pages, 6 figures; full version of SOCG 2002 paper; see also http://www.cs.uiuc.edu/~jeffe/pubs/schema.html