The AI Systems of Left 4 Dead - Valve

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Goal: Deliver Robust Behavior Performances ‣ Event Propagation ‣ Events propagate to all components ‣ In the Intention subsystem, events are • First handled by the innermost child Action • If child has no response, event is sent to buried Action • If no buried Actions have a response, event is sent to parent E vent: O n In ju re d A c to r Locom otion B ody V ision Intention B ehavior A ction A ction A ction B ehavior A ction A ction A ction
Goal: Deliver Robust Behavior Performances ‣ Example events • OnMoveToSuccess, OnMoveToFailure, OnStuck, OnUnStuck, OnAnimationActivityComplete, OnAnimationEvent, OnContact, OnInjured, OnKilled, OnOtherKilled, OnSight, OnLostSight, OnSound, OnPickUp, OnDrop ‣ Actions can implement event handler methods, providing context-specific reactions to game events
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 41: 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 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 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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