The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability Procedurally Populated Environments ‣ Populating Wandering Infected • Stored as a simple count (N) in each area • Counts are randomly determined at map (re)start based on Escape Route length and desired density • When an area enters the AAS • Create N Infected (if possible) • When an area leaves the AAS, or a pending Mob needs more members • Wanderers in the area are deleted and N is increased accordingly • Wanderer count (N) is zeroed: • When an area becomes visible to any Survivor • When the Director is in Relax mode
Goal: Promote Replayability Procedurally Populated Environments ‣ Example • Green areas are entering the AAS and wanderers are being spawned • Red areas are leaving the AAS, and the Infected within will be de-spawned E X IT E NT E R
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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
Page 15 and 16: Goal: Deliver Robust Behavior Perfo
Page 47 and 48: Goal: Provide Competent Human Playe
Page 49 and 50: Goal: Provide Competent Human Playe
Page 51 and 52: Goals of Left 4 Dead AI ‣ Deliver
Page 53 and 54: Goal: Promote Replayability ‣ In
Page 55 and 56: Goal: Promote Replayability Procedu
Page 57 and 58: ‣ The Navigation Mesh • Represe
Page 61 and 62: ‣ The Active Area Set Goal: Promo
Page 63 and 64: ‣ The Active Area Set Goal: Promo
Page 65: Goal: Promote Replayability Procedu
Page 77 and 78: Goals of Left 4 Dead AI ‣ Deliver
Page 79 and 80: Goal: Generate dramatic game pacing
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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