By Jean-Daniel Boissonnat, Monique Teillaud
This booklet covers combinatorial facts constructions and algorithms, algebraic concerns in geometric computing, approximation of curves and surfaces, and computational topology. each one bankruptcy absolutely info and gives an instructional creation to big recommendations and effects. the focal point is on tools that are either good based mathematically and effective in perform. assurance comprises references to open resource software program and dialogue of capability purposes of the awarded techniques.
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Additional resources for Effective Computational Geometry for Curves and Surfaces
Kettner, M. Teillaud, R. Wein, N. Wolpert v f u1 f f u2 v2 u v1 (a) h2 (b) h1 (c) Fig. 9. The various insertion procedures. The inserted x-monotone curve is drawn with a light dashed line, surrounded by two solid arrows that represent the pair of twin halfedges added to the Dcel. Existing vertices are shown as black dots while new vertices are shown as light dots. Existing halfedges that are aﬀected by the insertion operations are drawn as dashed arrows. (a) Inserting a subcurve as a new hole inside the face f .
Fogel, D. Halperin, L. Kettner, M. Teillaud, R. Wein, N. Wolpert vertices are the most convenient landmarks, but other landmark sets, such as randomly sampled points or points on a grid, can be used as well. The landmarks point-location strategy oﬀers competitive query times in comparison with the trapezoidal-based algorithm. Its main advantage is that the time needed to construct and maintain its auxiliary Kd-tree is relatively small in comparison to the running-time penalty incurred by the auxiliary data structures maintained by the trapezoidal point-location strategy.
Kettner, M. Teillaud, R. Wein, N. Wolpert Suppose we wish to insert a planar curve Ci into an existing arrangement Ai−1 of the curves C1 , . . , Ci−1 . The insertion procedure of the ﬁrst curve into an empty arrangement is trivial, so we will assume that i > 1 and Ai−1 represents the arrangement of a non-empty set of curves. We will further assume that Ci is (weakly) x-monotone — if this is not the case, we will subdivide it into several x-monotone segments and insert each segment separately. To insert an x-monotone curve Ci we will execute the following procedure: 1.