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The AI Systems of Left 4 Dead - Valve

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Goal: Deliver Robust Behavior Performances<br />

‣ Reactive Path Following: Climbing<br />

• To ensure the Common Infected horde are always<br />

dangerous, they have the ability to rapidly climb<br />

• Climbing is algorithmic, using a similar technique to local<br />

obstacle avoidance<br />

• Algorithmic climbing solves two major issues<br />

• Navigating the complex geometry <strong>of</strong> the post apocalyptic world<br />

<strong>of</strong> <strong>Left</strong> 4 <strong>Dead</strong><br />

• Navigating over movable physics props

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