The Bottleneck Problem in NPC Navigation

This Habr article explores a common game development challenge: NPC behavior when navigating through narrow passages like gates. The author notes that pathfinding algorithms like A* excel at route planning but fail to account for agent density. When a large number of units attempt to pass through a bottleneck simultaneously, it results in traffic jams, jittering, and inefficient movement because these algorithms are not designed for mass interaction in confined spaces. Solving this requires developers to build a world model that considers not just mathematical path accuracy, but also player expectations regarding bot behavior. The author emphasizes the importance of 'deceiving' the player to ensure smooth gameplay, similar to techniques like 'coyote time' in platformers, to prevent visual artifacts and AI stupidity when encountering level geometry constraints.