Abstract.
It is known that the region V(s) of a simple polygon P, directly visible (illuminable) from an internal point s, is simply connected. Aronov et al. [2] established that the region V1(s) of a simple polygon visible from an internal point s due to at most one diffuse reflection on the boundary of the polygon P, is also simply connected. In this paper we establish that the region V2(s), visible from s due to at most two diffuse reflections may be multiply connected; we demonstrate the construction of an n-sided simple polygon with a point s inside it so that the region of P visible from s after at most two diffuse reflections is multiply connected. We also show that V3(s), the region of P visible from s after at most three diffuse reflections, can have Ω(n) holes.
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A part of this work was done when this author was visiting the University of Miami, Coral Gables, Florida, USA.
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Brahma, S., Pal, S.P. & Sarkar, D. A linear worst-case lower bound on the number of holes inside regions visible due to multiple diffuse reflections. J. geom. 81, 5–14 (2004). https://doi.org/10.1007/s00022-004-1726-2
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DOI: https://doi.org/10.1007/s00022-004-1726-2