The Active Area Set

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The Active Area Set from the AI System of Left 4 Dead.

The Active Area Set (or AAS for short) is a concept in the navigation mesh of the Left 4 Dead series. It is the set of Navigation Areas surrounding the Survivor team. The AI Director creates/destroys population as the AAS moves through the environment. It allows for hundreds of enemies using a small set of reused entities.

See also

• L4D Level Design/Nav Meshes
• L4D Level Design/Nav Flow
• L4D Level Design/Advanced Nav Editing
• List of L4D Series Nav Mesh Attributes
• Navigation Meshes
• AI System of Left 4 Dead