Abstract
Given a triangulated closed surface, the problem of constructing a hierarchy of surface models of decreasing level of detail has attracted much attention in computer graphics. A hierarchy provides view-dependent refinement and facilitates the computation of parameterization. For a triangulated closed surface of n vertices and genus g, we prove that there is a constant c > 0 such that if n > c.g, a greedy strategy can identify Θ(n) topology-preserving edge contractions that do not interfere with each other. Further, each of them affects only a constant number of triangles. Repeatedly identifying and contracting such edges produces a topology-preserving hierarchy of O(n + g 2) size and O(logn + g) depth. When no contractible edge exists, the triangulation is irreducible. Nakamoto and Ota showed that any irreducible triangulation of an orientable 2-manifold has at most maxû342g - 72,4ý vertices. Using our proof techniques we obtain a new bound of max|240g, 4.
Research of the first and third authors was partially supported by RGC CERG HKUST 6088/99E and HKUST 6190/02E.
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Cheng, SW., Dey, T.K., Poon, SH. (2002). Hierarchy of Surface Models and Irreducible Triangulation. In: Bose, P., Morin, P. (eds) Algorithms and Computation. ISAAC 2002. Lecture Notes in Computer Science, vol 2518. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-36136-7_26
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DOI: https://doi.org/10.1007/3-540-36136-7_26
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