The AI Systems of Left 4 Dead - Valve

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‣ Boss Population • Positioned every N units along “escape route” +/- random amount at map (re)start. • Three Boss events are shuffled and dealt out: Tank, Witch, and Nothing. • Successive repeats are not allowed (ie: Tank, then Tank again) Goal: Promote Replayability Procedurally Populated Environments Tank Witch Witch Tank Witch Tank
Goal: Promote Replayability Procedurally Populated Environments ‣ Weapon Caches • Map designer creates several possible weapon caches in each map, the AI Director chooses which will actually exist ‣ Scavenge Items • Map designer creates many possible item groups throughout the map, the AI Direction chooses which groups actually exist ‣ Why designer-placed • Prediction of possible locations beneficial in this case • Allows visual storytelling/intention • Solves item placement issues (leaning against wall, mounted in gun rack, etc)
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The AI Systems of Left 4 Dead Micha
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Left 4 Dead: The Survivor Team
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Left 4 Dead: The Special Infected
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Left 4 Dead
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Left 4 Dead
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Goals of Left 4 Dead AI ‣ Deliver
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Goal: Deliver Robust Behavior Perfo
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Page 23 and 24: Goal: Deliver Robust Behavior Perfo
Page 47 and 48: Goal: Provide Competent Human Playe
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Page 51 and 52: Goals of Left 4 Dead AI ‣ Deliver
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 73: Goal: Promote Replayability Procedu
Page 77 and 78: Goals of Left 4 Dead AI ‣ Deliver
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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