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Visibility Maps of Segments and Triangles in 3D

机译:3D中线段和三角形的可见性图

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Let T be a set of n disjoint triangles in three-dimensional space, let s be a line segment, and let t be a triangle, both disjoint from T. We consider the visibility map of s with respect to T, i.e., the portions of T that are visible from s. The visibility map of t is defined analogously. We look at two different notions of visibility: strong (complete) visibility, and weak (partial) visibility. The trivial Ω (n~2) lower bound for the combinatorial complexity of the strong visibility map of both s and t is almost tight: we prove an O(n~2 log n) upper bound for both structures. Furthermore, we prove that the weak visibility map of s has complexity Θ(n~5), and the weak visibility map of t has complexity Θ(n~7). If T is a polyhedral terrain, the complexity of the weak visibility map is Ω(n~4) and O(n~5), both for a segment and a triangle. We also present efficient algorithms to compute all discussed structures.
机译:设T为三维空间中n个不相交的三角形的集合,s为线段,t为三角形,均与T不相交。我们考虑s相对于T的可见性图,即部分从可见的T的T。 t的可见性图类似地定义。我们查看可见性的两种不同概念:强(完整)可见性和弱(部分)可见性。 s和t的强可见性图的组合复杂度的琐碎Ω(n〜2)下限几乎是紧密的:我们证明了两种结构的O(n〜2 log n)上限。此外,我们证明了s的弱可见性图具有复杂度Θ(n〜5),而t的弱可见性图具有复杂度Θ(n〜7)。如果T是多面体地形,则对于线段和三角形,弱可见性图的复杂度分别为Ω(n〜4)和O(n〜5)。我们还提出了有效的算法来计算所有讨论的结构。

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