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The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability<br />

Procedurally Populated Environments<br />

‣ Where to spawn<br />

• Behind Survivors<br />

• Only select valid areas in the AAS<br />

that are at or behind the Survivor<br />

team’s “flow” distance<br />

• 75% <strong>of</strong> Mobs come from behind,<br />

since wanderers and<br />

Special/Boss Infected are usually<br />

engaged ahead <strong>of</strong> the team<br />

E X IT<br />

E NT E R

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