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Preprocessing Chains for Fast Dihedral Rotations Is Hard or Even Impossible

Michael Soss·Jeff Erickson·Mark Overmars
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Abstract

We examine a computational geometric problem concerning the structure of polymers. We model a polymer as a polygonal chain in three dimensions. Each edge splits the polymer into two subchains, and a dihedral rotation rotates one of these chains rigidly about this edge. The problem is to determine, given a chain, an edge, and an angle of rotation, if the motion can be performed without causing the chain to self-intersect. An Omega(n log n) lower bound on the time complexity of this problem is known. We prove that preprocessing a chain of n edges and answering n dihedral rotation queries is 3SUM-hard, giving strong evidence that solving n queries requires Omega(n^2) time in the worst case. For dynamic queries, which also modify the chain if the requested dihedral rotation is feasible, we show that answering n queries is by itself 3SUM-hard, suggesting that sublinear query time is impossible after any amount of preprocessing.

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Michael Soss, Jeff Erickson, Mark Overmars. 2002-04-19. Preprocessing Chains for Fast Dihedral Rotations Is Hard or Even Impossible. https://arxiv.org/abs/cs/0204042

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