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A typical interior cell navmesh

NavMeshes represent the actual area that an NPC can walk on. They are a list of triangles (and edges) with additional specific information such as slope, edge type or extra information like cover, preferred surfaces, or water area.

The Navmesh system is new and has completely replaced pathnode grids as the primary pathfinding solution for Fallout 3 and New Vegas.

Navmesh allows AI to build more complex and varied paths thanks to data which can be added to navmesh by creators or generated dynamically at run-time.