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Visibility (geometry)
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, visibility is a mathematical <a href="/facts/Abstraction/p7l9eHGd">abstraction</a> of the real-life notion of visibility. </p><p>Given a set of obstacles in the <a href="/facts/Euclidean_space/R2UbzmzM">Euclidean space</a>, two points in the space are said to be visible to each other, if the <a href="/facts/Line_segment/V8E0M4qk">line segment</a> that joins them does not intersect any obstacles. (In the <a href="/facts/Earth%27s_atmosphere/FV97Am25">Earth's atmosphere</a> light follows a slightly curved path that is not perfectly predictable, complicating the calculation of actual visibility.) </p><p>Computation of visibility is among the basic problems in <a href="/facts/Computational_geometry/eeaotQtl">computational geometry</a> and has applications in <a href="/facts/Computer_graphics/lapBE8wv">computer graphics</a>, <a href="/facts/Motion_planning/DoSPv4dB">motion planning</a>, and other areas. </p>