The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability Procedurally Populated Environments ‣ Populating via Structured Unpredictability • Not purely random, nor deterministically uniform • Population functions where space and/or time varies based on designer-defined amount of randomization • Example: Mob spawns • Occur at randomized interval between 90 and 180 seconds • Located at randomized spot “behind” the Survivor team • Structured Unpredictability = Superposition of several of these population functions
Goal: Promote Replayability Procedurally Populated Environments ‣ Structured Unpredictability in Left 4 Dead • Wanderers (high frequency) • Common Infected that wander around in a daze until alerted by a Survivor • Mobs (medium frequency) • A large group (20-30) of enraged Common Infected that periodically rush the Survivors • Special Infected (medium frequency) • Individual Infected with special abilities that harass the Survivor team • Bosses (low frequency) • Powerful Infected that force the Survivors to change their strategy • Weapon Caches (low frequency) • Collections of more powerful weapons • Scavenge Items (medium frequency) • Pipe bombs, Molotovs, Pain Pills, Extra Pistols
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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
Page 13 and 14: 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: ‣ The Active Area Set Goal: Promo
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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