Efficient Detection of Intersections Among Spheres
Efficient Detection of Intersections Among Spheres
J E Hopcroft
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V(r^. Z^- y-, . Y-^ ', ;) is handled in time 0(log-". — . ' ). Where : is the total number of spheres satiifying the query condi- tions. This description of the data structure T completes the definition of our algorithm and the analysis of its complexity. We now turn to prove the correctness of the algorithm, h is plain that the algorithm never reports a spurious intersection. Keace »e only need to show that if any two spheres in S intersect each other, then at least one such intersection will ...be detected in at least one sweep performed by the algorithm. In fact we will show thai the intersection between the two spheres ^i. I^ ^°^ which min(ri. R-;) is maximal mtist be detected in at kast one sweep of the ;3t8 n? b'^MTi'jiZ&q ••asi -5- algorithm. Suppose that these two spheres s^, 3o 6 S intersect each other, and let their centers be Ci, Co and their radii be rj, r2 respectively, so that ri
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