Ray Shooting And Other Applications of Spanning Trees With Low Stabbing Number

Cover Ray Shooting And Other Applications of Spanning Trees With Low Stabbing Number
Ray Shooting And Other Applications of Spanning Trees With Low Stabbing Number
Pankaj K Agarwal
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Proof: Suppose there are two points x and y in a face / such that the lines x* and y' intersect the segments of wj in two different orders. Since the segments in Q are non- intersecting, rotating x' towards y' (in the direction that avoids a vertical orientation) we must reach a line p* that either contains a segment of wj, or passes through an endpoint of a segment of wj. (Note that this claim does not hold if the segments can intersect. ) The dual p of p' is a point that Hes on the segment ly
..., hence in /. This, however, contradicts Lemma 4. 1, thus showing that the duals of all points in / intersect the segments of wj in the same order.
Ray shooting & other applications May 17, 1989 Tradeoff between Space and Query Time 15 D Sort the segments in wj in the order provided by Lemma 4. 2. For a ray p, let the image of p be the dual of the line containing p. If the image of a ray p lies in the face / € A{C'), then ^{Q, p) can be computed in O(logn) time by a binary search on Wf. Therefore, it suffices to show how to store all the lists wj using only 0{n^) space, so that binary search in each of them can still be done in O(logn) time.


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