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Nav Modifier volumes

Available on Nav Modifier volumes.

PropertyEffect
Nav Area ClassArea painted over the shape. Default NavArea_Null cuts a hole in the navmesh
Nav Area Class to ReplaceOnly convert this one area instead of overriding everything
Nav Mesh ResolutionForce Low / Default / High tile resolution under this volume
Mask Fill Collision UnderneathStop navmesh generating on surfaces below the volume

The area follows the volume's exact footprint (curves and concave corners included), not a bounding box.

Requires a NavMesh Bounds Volume

Like any navmesh modification, the area only takes effect where a NavMesh Bounds Volume covers it.

Edge quality

Nav modifier edges stair-step, because Recast marks navigation areas per voxel with no contour simplification. See Known limitations for the workarounds.