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NavigationLayers are an optional feature to further control which navigation meshes are considered in a path query. They work similar to how physics layers control collision between collision objects or how visual layers control what is rendered to the Viewport.

NavigationLayers can be named in the ProjectSettings the same as physics layers or visual layers.

如果一個區域沒有一個與路徑查詢的「navigation_layers」參數相容的導覽層，則在尋路時將跳過該區域的導覽網格。有關查詢導覽伺服器路徑的更多信息，請參閱 doc_navigation_using_navigationpaths 。

NavigationLayers are a single int value that is used as a bitmask. Many navigation related nodes have set_navigation_layer_value() and get_navigation_layer_value() functions to set and get a layer number directly without the need for more complex bitwise operations.

In scripts the following helper functions can be used to work with the navigation_layers bitmask.

2D GDScript3D GDScript

func change_layers():
    var region: NavigationRegion2D = get_node("NavigationRegion2D")
    # enables 4-th layer for this region
    region.navigation_layers = enable_bitmask_inx(region.navigation_layers, 4)
    # disables 1-rst layer for this region
    region.navigation_layers = disable_bitmask_inx(region.navigation_layers, 1)

    var agent: NavigationAgent2D = get_node("NavigationAgent2D")
    # make future path queries of this agent ignore regions with 4-th layer
    agent.navigation_layers = disable_bitmask_inx(agent.navigation_layers, 4)

    var path_query_navigation_layers: int = 0
    path_query_navigation_layers = enable_bitmask_inx(path_query_navigation_layers, 2)
    # get a path that only considers 2-nd layer regions
    var path: PoolVector2Array = NavigationServer2D.map_get_path(
        map,
        start_position,
        target_position,
        true,
        path_query_navigation_layers
        )

static func is_bitmask_inx_enabled(_bitmask: int, _index: int) -> bool:
    return _bitmask & (1 << _index) != 0

static func enable_bitmask_inx(_bitmask: int, _index: int) -> int:
    return _bitmask | (1 << _index)

static func disable_bitmask_inx(_bitmask: int, _index: int) -> int:
    return _bitmask & ~(1 << _index)

更改路徑查詢的導覽層是啟用/停用整個導覽區域的一種效能友善的替代方案。與區域變更相比，具有不同導覽層的導覽路徑查詢不會觸發導覽伺服器上的大規模更新。

Changing the navigation layers of NavigationAgent nodes will have an immediate effect on the next path query. Changing the navigation layers of regions will have an effect after the next NavigationServer sync.