The AI Systems of Left 4 Dead - Valve

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‣ Populating Mobs • Created at randomized intervals (90-180 seconds on Normal difficulty) • Boomer Vomit forces Mob spawn, resets random interval • Mob size grows from minimum just after spawn to maximum after a duration to balance difficulty <strong>of</strong> successive, frequent Mobs Goal: Promote Replayability Procedurally Populated Environments
Goal: Promote Replayability Procedurally Populated Environments ‣ Populating the Special Infected • Created at individually randomized intervals • Use valid area in the AAS not visible by the Survivor team appropriate to Special’s class • Boomers spawn ahead, since they are slow and can’t chase well • Smokers attempt to select areas above the Survivor team
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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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Goal: Deliver Robust Behavior Perfo
Page 17 and 18: 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 67: 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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