The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability Procedurally Populated Environments ‣ First, a short summary of tools used to generate Structured Unpredictability • Navigation Mesh • Flow Distance • Potential Visibility • Active Area Set
‣ The Navigation Mesh • Represents “walkable space” • Originally created for Counter- Strike Bot pathfinding • Useful for general spatial reasoning and spatially localized information • Has area A ever been seen by actor B • Is area X potentially visible by area Y • Where is a spot near the Survivors, not visible to any of them • How far have we traveled to reach this area Goal: Promote Replayability Procedurally Populated Environments
Page 1 and 2:
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: Goal: Promote Replayability Procedu
Page 59 and 60: Goal: Promote Replayability Procedu
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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