Line of sight (video games)
What can be seen by a game participant / From Wikipedia, the free encyclopedia
Line of sight, sometimes written line-of-sight or abbreviated to LoS, is the visibility (that is, who can see what) on the playing field in wargames and some role-playing games (RPGs). Many abilities can only be used on entities within a character's line of sight.
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In some games, miniature figures are used to determine line of sight. Many wargames use counters to represent units and determine line of sight. A common technique is to hold a length of thread between two counters. If the thread, held straight, doesn't encounter any obstacles, the line of sight is valid.
The first computer game to implement line of sight graphics was Dungeon, which was played on a PDP-10 mainframe computer (1975).