The AI Systems of Left 4 Dead - Valve

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Goal: Generate dramatic game pacing Adaptive Dramatic Pacing ‣ Estimating the “emotional intensity” of each Survivor • Represent Survivor Intensity as a value • Increase Survivor Intensity • When injured by the Infected, proportional to damage taken • When the player becomes incapacitated • When player is pulled/pushed off of a ledge by the Infected • When nearby Infected dies, inversely proportional to distance • Decay Survivor Intensity towards zero over time • Do NOT decay Survivor Intensity if there are Infected actively engaging the Survivor
Goal: Generate dramatic game pacing Adaptive Dramatic Pacing ‣ Use Survivor Intensity to modulate the Infected population • Build Up • Create full threat population until Survivor Intensity crosses peak threshold • Sustain Peak • Continue full threat population for 3-5 seconds after Survivor Intensity has peaked • Ensures minimum “build up” duration. • Peak Fade • Switch to minimal threat population (“Relax period”) and monitor Survivor Intensity until it decays out of peak range • This state is needed so current combat engagement can play out without using up entire Relax period. Peak Fade won’t allow the Relax period to start until a natural break in the action occurs. • Relax • Maintain minimal threat population for 30-45 seconds, or until Survivors have traveled far enough toward the next safe room, then resume Build Up. R e lax B uild Up P e ak F ad e S us tain P e ak
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The AI Systems of Left 4 Dead Micha
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Left 4 Dead: The Survivor Team
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Left 4 Dead: The Special Infected
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Left 4 Dead
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Left 4 Dead
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Goals of Left 4 Dead AI ‣ Deliver
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Goal: Deliver Robust Behavior Perfo
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Page 51 and 52: Goals of Left 4 Dead AI ‣ Deliver
Page 53 and 54: Goal: Promote Replayability ‣ In
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Page 57 and 58: ‣ The Navigation Mesh • Represe
Page 61 and 62: ‣ The Active Area Set Goal: Promo
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Page 79: Goal: Generate dramatic game pacing
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Page 93 and 94: ‣ Just the beginning… • Expan
Page 95: THANK YOU!
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The AI Systems of Left 4 Dead - Valve

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