The AI Systems of Left 4 Dead - Valve

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Goal: Deliver Robust Behavior Performances ‣ Contextual Query System ‣ Actions can implement query methods, providing contextspecific answers to questions ‣ Defines queries that can be asked <strong>of</strong> the Behavior/Action system as a “black box” ‣ Queries propagate from childmost Action outward until an answer is given, identically to Event propagation ‣ Allows concurrent Behaviors to coordinate • ie: We are able to opportunistically able to pick up an object, should we
Goal: Deliver Robust Behavior Performances ‣ Example Queries • SelectMoreDangerousThreat( me, subject, threat1, threat2 ) • Allows bot to find the most dangerous threat to someone else (ie: an incapacitated player it wants to help) • ShouldPickUp • ShouldHurry • IsHindrance
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 43: 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:
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The AI Systems of Left 4 Dead - Valve

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