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The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability<br />

Procedurally Populated Environments<br />

‣ <strong>The</strong> Active Area Set (AAS)<br />

• <strong>The</strong> set <strong>of</strong> Navigation Areas<br />

surrounding the Survivor team<br />

• <strong>The</strong> <strong>AI</strong> Director creates/destroys<br />

population as the AAS moves<br />

through the environment<br />

• Allows for hundreds <strong>of</strong> enemies<br />

using a small set <strong>of</strong> reused entities<br />

E X IT<br />

E NT E R

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