The AI Systems of Left 4 Dead - Valve

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‣ “Flow Distance” • Travel distance from the starting safe room to each area in the navigation mesh • Following increasing flow gradient always takes you to the exit room • “Escape Route” = shortest path from start safe room to exit • Used as a metric for populating enemies and loot, and for answering questions such as “is this spot ahead or behind the Survivor group” Goal: Promote Replayability Procedurally Populated Environments
Goal: Promote Replayability Procedurally Populated Environments ‣ The Active Area Set (AAS) • The set of Navigation Areas surrounding the Survivor team • The AI Director creates/destroys population as the AAS moves through the environment • Allows for hundreds of enemies using a small set of reused entities E X IT E NT E R
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The AI Systems of Left 4 Dead Micha
Page 3 and 4:
Left 4 Dead: The Survivor Team
Page 5 and 6:
Left 4 Dead: The Special Infected
Page 7 and 8: Left 4 Dead
Page 9 and 10: Left 4 Dead
Page 11 and 12: 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 53 and 54: Goal: Promote Replayability ‣ In
Page 55 and 56: Goal: Promote Replayability Procedu
Page 57: ‣ 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 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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