The Shortest Watchtower And Related Problems for Polyhedral Terrains
The Shortest Watchtower And Related Problems for Polyhedral Terrains
Micha Sharir
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Let e = ab be an edge of S. For each Ostrsl define u(t)= (l-/)a + tb € e, and v(r) = the point on L lying directly above w(f). Let F t (t)= |«(r)v(r)|. It is easily checked that F e is a piecewise linear convex function of t (where breakpoints on F e occur when v(f) lies on an edge of L). It therefore has a global minimum which is attained either at a breakpoint or in some subinterval of e between adjacent breakpoints. Moreover, given any point u(t) on e, if we know the corresponding point v(»)... and the face of L on which it lies, then we can deter- mine, in constant additional time, on which side of u (t) the minimum of F e is attained, or that this minimum is attained at t itself. (Note also that finding v(f), given «(f), can be done in 0(log n) time, by locating the projection u*(t) of u(t) in the map L* . ) To elaborate this observation, let 0
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