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The AI Systems of Left 4 Dead - Valve

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Goal: Generate dramatic game pacing<br />

Adaptive Dramatic Pacing<br />

‣ Full Threat Population (Build Up)<br />

• Wanderers<br />

• Mobs<br />

• Special Infected<br />

‣ Minimal Threat Population (Relax)<br />

• No Wanderers until team is “calm”<br />

• No Mobs<br />

• No Special Infected (although existing Specials may attack)<br />

‣ Boss Encounters NOT affected by adaptive pacing<br />

• Overall pacing affected too much if they are missing<br />

• Boss encounters are intended to change up the pacing anyhow

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