The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability ‣ Static placement of enemies and loot hinders replayability • Players are good at memorizing all static locations • Removes suspense of not knowing what will happen next • Results in “optimal strategy” that works every time • Players expect everyone to have memorized all encounters • Kills cooperation and degenerates into a race ‣ Even multiple sets of manually placed triggers/scripts fails • Players learn all of them, and if they don’t see A, they prepare for B or C, etc.
Goal: Promote Replayability Procedurally Populated Environments ‣ How do we procedurally populate the environment with interesting distributions of enemies • Using Structured Unpredictability • Part of the collection of systems called the “AI Director”
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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: Goal: Promote Replayability ‣ In
Page 57 and 58: ‣ The Navigation Mesh • Represe
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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