2D agent that is used in navigation to reach a position while avoiding static and dynamic obstacles. The dynamic obstacles are avoided using RVO (Reciprocal Velocity Obstacles) collision avoidance. The agent needs navigation data to work correctly. By default this node will register to the default [World2D] navigation map. If this node is a child of a [Navigation2D] node it will register to the navigation map of the navigation node or the function [method set_navigation] can be used to set the navigation node directly. [NavigationAgent2D] is physics safe.
[b]Note:[/b] After setting [member target_position] it is required to use the [method get_next_position] function once every physics frame to update the internal path logic of the NavigationAgent. The returned vector position from this function should be used as the next movement position for the agent's parent Node.
[b]Note:[/b] By default, the expensive calculations for avoidance are done in a thread. In HTML5 exports without thread support, they will be done on the main thread, which can lead to performance issues.
Returns the distance to the target position, using the agent's global position. The user must set [member target_position] in order for this to be accurate.
Returns the reachable final position in global coordinates. This can change if the navigation path is altered in any way. Because of this, it would be best to check this each frame.
Returns this agent's current path from start to finish in global coordinates. The path only updates when the target position is changed or the agent requires a repath. The path array is not intended to be used in direct path movement as the agent has its own internal path logic that would get corrupted by changing the path array manually. Use the intended [method get_next_position] once every physics frame to receive the next path point for the agents movement as this function also updates the internal path logic.
Returns the [RID] of the navigation map for this NavigationAgent node. This function returns always the map set on the NavigationAgent node and not the map of the abstract agent on the NavigationServer. If the agent map is changed directly with the NavigationServer API the NavigationAgent node will not be aware of the map change. Use [method set_navigation_map] to change the navigation map for the NavigationAgent and also update the agent on the NavigationServer.
Returns the next position in global coordinates that can be moved to, making sure that there are no static objects in the way. If the agent does not have a navigation path, it will return the position of the agent's parent. The use of this function once every physics frame is required to update the internal path logic of the NavigationAgent.
Returns [code]true[/code] if [member target_position] is reached. It may not always be possible to reach the target position. It should always be possible to reach the final position though. See [method get_final_position].
Based on [code]value[/code], enables or disables the specified layer in the [member navigation_layers] bitmask, given a [code]layer_number[/code] between 1 and 32.
Sends the passed in velocity to the collision avoidance algorithm. It will adjust the velocity to avoid collisions. Once the adjustment to the velocity is complete, it will emit the [signal velocity_computed] signal.
If [code]true[/code] the agent is registered for an RVO avoidance callback on the [Navigation2DServer]. When [method set_velocity] is used and the processing is completed a [code]safe_velocity[/code] Vector2 is received with a signal connection to [signal velocity_computed]. Avoidance processing with many registered agents has a significant performance cost and should only be enabled on agents that currently require it.
If [member debug_use_custom] is [code]true[/code] uses this rasterized point size for rendering path points for this agent instead of global point size.
A bitfield determining all navigation map layers the [NavigationAgent2D] belongs to. On path requests the agent will ignore navmeshes without at least one matching layer.
The distance threshold before a path point is considered to be reached. This will allow an agent to not have to hit a path point on the path exactly, but in the area. If this value is set to high the NavigationAgent will skip points on the path which can lead to leaving the navigation mesh. If this value is set to low the NavigationAgent will be stuck in a repath loop cause it will constantly overshoot or undershoot the distance to the next point on each physics frame update.
The maximum distance the agent is allowed away from the ideal path to the final position. This can happen due to trying to avoid collisions. When the maximum distance is exceeded, it recalculates the ideal path.
The radius of the avoidance agent. This is the "body" of the avoidance agent and not the avoidance maneuver starting radius (which is controlled by [member neighbor_dist]).
Does not affect normal pathfinding. To change an actor's pathfinding radius bake [NavigationMesh] resources with a different [member NavigationMesh.agent_radius] property and use different navigation maps for each actor size.
The distance threshold before the final target point is considered to be reached. This will allow an agent to not have to hit the point of the final target exactly, but only the area. If this value is set to low the NavigationAgent will be stuck in a repath loop cause it will constantly overshoot or undershoot the distance to the final target point on each physics frame update.
The minimal amount of time for which this agent's velocities, that are computed with the collision avoidance algorithm, are safe with respect to other agents. The larger the number, the sooner the agent will respond to other agents, but the less freedom in choosing its velocities. Must be positive.
- [code]link_entry_position[/code]: If [code]owner[/code] is available and the owner is a [NavigationLink2D], it will contain the global position of the link's point the agent is entering.
- [code]link_exit_position[/code]: If [code]owner[/code] is available and the owner is a [NavigationLink2D], it will contain the global position of the link's point which the agent is exiting.
Notifies when the collision avoidance velocity is calculated after a call to [method set_velocity]. Only emitted when [member avoidance_enabled] is true.
