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env_traceris a point entity available in all Source games.
Bug: The tracer does not follow or update the target. The tracer always fires at its original position, even if the target is killed.
@PointClass base(Targetname, Parentname) size(-8 -8 -8, 8 8 8) = env_tracer : "An entity that fires a thin tracer between itself and a target, with a specified delay." [ target(target_destination) : "Target" : : "The target to fire the tracer at. Must be 256 or more units away from the env_tracer." delay(float) : "Delay" : 1 : "How long to wait before firing the tracer again, in seconds." ]