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NavigationAgent2D

Inherits: Node < Object

A 2D agent used to pathfind to a position while avoiding obstacles.

Description

A 2D agent used to pathfind to a position while avoiding static and dynamic obstacles. The calculation can be used by the parent node to dynamically move it along the path. Requires navigation data to work correctly.

Dynamic obstacles are avoided using RVO collision avoidance. Avoidance is computed before physics, so the pathfinding information can be used safely in the physics step.

Note: After setting the target_position property, the get_next_path_position method must be used once every physics frame to update the internal path logic of the navigation agent. The vector position it returns should be used as the next movement position for the agent's parent node.

Tutorials

• Using NavigationAgents

Properties

bool	avoidance_enabled	false
int	avoidance_layers	1
int	avoidance_mask	1
float	avoidance_priority	1.0
bool	debug_enabled	false
Color	debug_path_custom_color	Color(1, 1, 1, 1)
float	debug_path_custom_line_width	-1.0
float	debug_path_custom_point_size	4.0
bool	debug_use_custom	false
int	max_neighbors	10
float	max_speed	100.0
int	navigation_layers	1
float	neighbor_distance	500.0
float	path_desired_distance	20.0
float	path_max_distance	100.0
BitField<PathMetadataFlags>	path_metadata_flags	7
PathPostProcessing	path_postprocessing	0
PathfindingAlgorithm	pathfinding_algorithm	0
float	radius	10.0
float	target_desired_distance	10.0
Vector2	target_position	Vector2(0, 0)
float	time_horizon_agents	1.0
float	time_horizon_obstacles	0.0
Vector2	velocity	Vector2(0, 0)

Methods

float	distance_to_target ( ) const
bool	get_avoidance_layer_value ( int layer_number ) const
bool	get_avoidance_mask_value ( int mask_number ) const
PackedVector2Array	get_current_navigation_path ( ) const
int	get_current_navigation_path_index ( ) const
NavigationPathQueryResult2D	get_current_navigation_result ( ) const
Vector2	get_final_position ( )
bool	get_navigation_layer_value ( int layer_number ) const
RID	get_navigation_map ( ) const
Vector2	get_next_path_position ( )
RID	get_rid ( ) const
bool	is_navigation_finished ( )
bool	is_target_reachable ( )
bool	is_target_reached ( ) const
void	set_avoidance_layer_value ( int layer_number, bool value )
void	set_avoidance_mask_value ( int mask_number, bool value )
void	set_navigation_layer_value ( int layer_number, bool value )
void	set_navigation_map ( RID navigation_map )
void	set_velocity_forced ( Vector2 velocity )

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Signals

link_reached ( Dictionary details )

Notifies when a navigation link has been reached.

The details dictionary may contain the following keys depending on the value of path_metadata_flags:

• position: The start position of the link that was reached.

• type: Always NavigationPathQueryResult2D.PATH_SEGMENT_TYPE_LINK.

• rid: The RID of the link.

• owner: The object which manages the link (usually NavigationLink2D).

• link_entry_position: If owner is available and the owner is a NavigationLink2D, it will contain the global position of the link's point the agent is entering.

• link_exit_position: If owner is available and the owner is a NavigationLink2D, it will contain the global position of the link's point which the agent is exiting.

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navigation_finished ( )

Emitted once per loaded path when the agent internal navigation path index reaches the last index of the loaded path array. The agent internal navigation path index can be received with get_current_navigation_path_index.

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path_changed ( )

Emitted when the agent had to update the loaded path:

• because path was previously empty.

• because navigation map has changed.

• because agent pushed further away from the current path segment than the path_max_distance.

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target_reached ( )

Emitted once per loaded path when the agent's global position is the first time within target_desired_distance to the target_position.

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velocity_computed ( Vector2 safe_velocity )

Notifies when the collision avoidance velocity is calculated. Emitted when velocity is set. Only emitted when avoidance_enabled is true.

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waypoint_reached ( Dictionary details )

Notifies when a waypoint along the path has been reached.

The details dictionary may contain the following keys depending on the value of path_metadata_flags:

• position: The position of the waypoint that was reached.

• type: The type of navigation primitive (region or link) that contains this waypoint.

• rid: The RID of the containing navigation primitive (region or link).

• owner: The object which manages the containing navigation primitive (region or link).

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Property Descriptions

bool avoidance_enabled = false

• void set_avoidance_enabled ( bool value )

• bool get_avoidance_enabled ( )

If true the agent is registered for an RVO avoidance callback on the NavigationServer2D. When velocity is used and th