NavMesh.SamplePosition
static function SamplePosition(sourcePosition: Vector3, hit: NavMeshHit, maxDistance: float, allowedMask: int): bool;
Parameters

sourcePosition The origin of the sample query.
hit Holds the properties of the resulting location.
maxDistance Sample within this distance from sourcePosition.
allowedMask A mask specifying which NavMesh layers are allowed when finding the nearest point.
Returns
bool True if a nearest point is found.
Description

Sample the NavMesh closest to the point specified.