Arma Reforger:Behavior Editor: Nodes

Flow nodes define base rules how and with which conditions, are behavior tree branches executed.

Flow

Name	Description	Parameters/Input/Output	Notes
Root	The starting point of a behavior tree.		Cannot be removed or inserted from the nodes palette.
Selector	Executes children until one of them returns Success. Returns: Running: A child node still runs Success: A child node returned success Fail: All children returned fail
Sequence	Executes children from left to right as long as they return success. Returns success only if all children returned success. Returns: Running: A child node still runs Success: All children returned success Fail: Any child returned fail
Parallel	Executes all children regardless what they return. Returns: Running: If no child is assigned for getting its result Success: If the index of a child is assigned and the assigned child returns success Fail: If the index of a child is assigned and the assigned child returns fail	Parameters: Use Child Result: Select index of a child node, which result will be the result of the parallel node.
Repeater	Sequence node that is executed multiple times. Returns: Running: A child node still runs Success: All children returned success Fail: Any child returned fail	Parameters: Repeat Times: Specifies how many times you want to execute. Default is once.
Run BT	Runs selected Behavior Tree on the agent. Returns: Running: If the subtree returns running Success: If the result of the subtree is success Fail: If the result of subtree is fail, or the subtree could not be executed	Parameters: Behavior Tree: Specify behavior tree to run from the list. Run Repeatedly: True (Checked): Initialise the subtree once, then run it repeatedly without reinitialization False (Unchecked): Reinitialise and run the subtree every time. Variables in Array: New, unfinished feature Input: InBehaviorTree: Behavior Tree to run
Run Once	Executes all of its children only once. Returns: Success: Always		Intended to be used for one-time-only tasks, such as initialization.
Run On Entity	Executes children on a different entity than the owner of the behavior tree. Returns: Success: If the children were executed on entity successfully and returned success or running Fail: If one of the children returns fail or the entity is not found	Input: Entity	Should be used only with nodes and tasks that are not responding with Running result (reason: currently BT does not switch to scope of entity on which you wish to run those nodes, stays in scope of main BT)
Switch	Picks children depending on a variable value or randomly. Returns: Running: A child node still runs Success: A child node returned success Fail: It is aborted because of the variable change, the child returned fail, or could not find a proper child to run	Parameters: Values Array: For each children maximum value of in variable Random Range: For each children probability of execution. Specifies the range. Abort Variable Changed: True (Checked): Abort if the input variable is changed. The default is checked. False (Unchecked): Do not abort if the input variable is changed Input: InVariable: The variable that may be tracked for aborting (if abort variable changed is checked) and/or for picking the child node to run from the values array
For Each Child	Iterates through all group children. Returns: Running: A child node still runs Fail: If no entity, no AI group, no agent in the AI group, or a child returns fail Success: Otherwise	Parameters: Index from: Which should be starting index in an array. (Default: 0) Index to: Which should be max index to select. (-1 by default, to go through whole array) Return controlled entity: Return controlled entity, if false, return AI Agent. Output: Entity

Decorators

Decorators are test checking different states and variables, and determine if child or child branch should be executed.

Decorators

Name	Description	Parameters/Input/Output	Notes
Decorator	Node which tests specific condition. If condition result is true, decorator will execute its child and return true. Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Common decorator parameters: Negative result: Decorator will return negative value of the test. Use child result: Decorator will execute the child and return its result. Always true: Decorator will execute child node and then return true. Abort type: None: Do not abort anything Abort children branch: Abort all children under this node. Abort parent node with children: Abort self and all children under this node. Abort parent node further children: Abort parent node and its children, but proceed with children nodes.	Useful for tests through its parameters – use child result, aborting, etc. Combination of parameters can be used: When you use always true and negative result, decorator will also execute its child and return false. It's useful in case when you want your branch to return false, but execute child node in any case.
Test Variable	Decorator checking provided variable for assignment, comparation against value, or check for value change. Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Parameters: Test value: Specific value to test. Test type: Check if value is: Assigned Variable equals value Variable bigger than value Variable lower than value Variable was changed Inputs: Variable
Test Entity	Various tests on entity. Decorator checks validity of entity, either connected through variable, or according to its name. Can test other conditions like life state. Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Parameters: Entity name TEST: Space for selecting new kinds of tests, not working at the moment. Input: Entity
Test Distance to Entity	Checks distance of entity with treshold value. Returns true if distance is smaller than treshold by default. Check for ditance larger than treshold can be done with Use Negative Value parameter. Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Parameters: Entity name: Search entity by name. Distance treshold: Until what distance result will return true Inputs: Entity Position Distance
Danger Event	Checks agent if he has any danger events. Test can be performed against any or specified danger event. Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Parameters: Has Any: check for any type of danger event Danger event type: list of available danger events to check Distance treshold: Limit search for danger events to certain radius. Default 0 = range not limited.	Is there possibility to test several possible danger events in one decorator? (projectile hit + damage taken) Danger event is type of event about threat to entity, like someone fired, someone was killed, etc. They all have specified position in world.
Test Order	Tests if agent has order, or has specific order according to parameters. Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Parameters: Has Any Order Type
Aiming	Tests aiming Returns: Success: The child node returned success or when negating the result is selected and the child returns fail Fail: The child node returned fail or when negating the result is selected and the child returns success	Parameters: Test type: What test to run Is aimed Is aiming in limits Aim Threshold: Value for testing

Scripted Decorators

Decorators created in script, inherited from Scripted Decorator.

Name	Description	Parameters/Input/Output	Notes
Scripted Decorator	Scripted base class of decorator, used for inheritence of other scripted decorators.	Common decorator params: Negative result: Decorator will return negative value of the test. Use child result: Decorator will execute the child and return its result. Always true: Decorator will execute child node and then return true. Abort type: None: Do not abort anything Abort children branch: Abort all children under this node. Abort parent node with children: Abort self and all children under this node. Abort parent node further children: Abort parent node and its children, but proceed with children nodes.	Does not contain any new functionality than basic decorator.

Tasks

Leaf nodes tasked to perform specific operation. They can return true, false and running.

Name	Description	Parameters/Input/Output	Notes
Get Controlled Entity	Finds character entity controlled by agent running Behavior tree. Return: True: Entity was found False: Entity was not found	Parameters: Character Only: If true, accepts only character as controlled entity, not vehicle for example. Output: Entity	AI is composed of two entities, character and AI Agent. This is common way how to access character from Agent in Behavior tree.
Create Position	Creates position according to specifie vector or position of entity. It's possible to randomise the position from its given center. Return: True: Position was created. False: Failed to create position.	Parameters: Entity name: Calculate vector according to entity Offset Vector: Random Offset Multiplier: Input: Root vector Offset vector Entity Output: Position	Position output has to be saved as variable, it cannot be used directly as input node.
Follow Path	Follow given path Return: True: Move was completed False: Path couldn't be found or move is invalid Running: Movement on the path in progress	Parameters: Path points: Custom array of points to follow, optional Input Target Location
Move to Entity	Requests move to position of entity. This position is regularly updated, it should be used to move to target which can move. Return: True: Move was completed. False: Failed to add action on entity. Running: Movement to entity in progress.	Parameters: Precision XZ: Precision of ground position. Target object name: Name of the entity to find and follow. Entity update precision: How far away needs the entity to be to update the move request. Input: Entity
Move	Request move to specific position. Use to move to a static target. Return: True: Move was completed. False: Failed to add action on entity. Running: Movement in progress.	Parameters: Target location: In world location to go to Precision XZ: Precision of ground position. Precision Y: Height precision. Target rotation: Rotation of entity during action. Target rotation to: Rotation related to specified entity (sun for example). Rotation precision: Angle in degrees Time to complete: Desired time to move completion (default: -1: Unlimited time) Enable avoidance: Avoid obstacles during the action. Input: Target location Target rotation
Aim	Requests aiming on entity, position or specified direction. Returns: True – task succesfully finished Running – task is ongoing False – request failed	Parameters: Precision XZ Precision Y Input: Direction Aim at position Entity
Get in Vehicle	Moves character into vehicle. Return: True: Entity can get into vehicle False: Unit is in vehicle already or cannot board	Parameters: Position: Pilot Gunner Turret Cargo Vehicle Name: Select vehicle by name Input: Vehicle
Land	Realizes movement over landing position and descend into position. Return: True: Land was completed. False: Agent failed landing or cannot move. Running: Landing in progress.	Parameters: Target location Precision XZ: Precision of ground position. Precision Y: Height precision. Target rotation: Rotation of entity during action. Target rotation to: Rotation related to specified entity (sun for example). Rotation precision Time to complete: Desired time to move completion (default: -1: Unlimited time) Enable avoidance: Avoid obstacles during the action. Input: Target location Target rotation
Stop	Cancel movement and/or aiming of entity. Return: True: Entity can be stopped False: Stopping failed	Parameters: Stop flags: Movements Aiming
Get Out Vehicle	Request disembarking from vehicle. Return: True: Unit is in vehicle False: Unit is outside vehicle
Set Movement Speed	Request change of movement speed of controlled entity. Return: True: Movement speed set. False: Failed to set movement speed.	Parameters: Speed: Wanted movement speed (m/s)
Orient	Requests change of orientation of controlled entity. Return: True: Request completed. False: Request failed. Running: During orientation change.	Parameters: Rotation precision Target rotation to: Rotation related to specified entity (sun for example). Input: Target location
Enable Obstacle Avoidance	Allows or disables obstacle avoidance for controlled character. Return: True: Change of obstacle avoidance succeeded. False: Change of obstacle avoidance failed.	Parameters: Obstacle avoidance Input: Obstacle avoidance
Get Aiming Position	Calculate the position of the target. It's possible to predict target's position in future using parameter Lead movement time. This node will not calculate any ballistics, just tracks the position of the target and interpolate the result. Return: True: Position found. False: Failed to find position.	Parameters: Lead movement time - Predict position in future, using current velocity Input: Entity Output: Position
Send Order	Creates order and add it to order list. Can be used on any entity, controlled entity is selected by default. Any entity can be also selected as sender. Return: True: Order was added to target entity. False: Order failed to add.	Parameters: Order type None Hold Move Follow Rearm Defend Get In Highest priority - If true, order will be first one in queue. If false will be queued. Input: Sender Receiver Position Entity Order type
Idle	Wait for given seconds. Waiting time can be randomised. Return: True: Timer is finished Running: Timer is active	Parameters: Period - For how long to idle Period random - Random dispersion Input: Period key
Current Order	Get data about current order. Return: True: Current order data received. False: Failed to receive current order data.	Output: Order object Order position Order type
Finish Order	Finishes current order. Return: True – if there was order and it was finished False – test failed or order was not finished

Utility Tasks

Tasks handling very basic functions as operations with variables.

Name	Description	Parameters/Input/Output	Notes
Set/Clear Variable	Allows for setting value or clearing variable. Return: True: Value set or cleared successfully. False: Failed to set/clear variable.	Parameters: Set value - What value should variable have Clear variable - If value should be cleared (deassigned)
Find Entity	Find entity by name or class name. Return: True: Entity found. False: Entity not found.	Parameters: Entity name - Search by entity name Entity class name - Search by class name Distance test - if bigger than 0, returns entity only if closer than this distance Output: Entity

Scripted Tasks

Scripted variants of Task, inherited from scriptedTask.

Name	Description	Parameters/Input/Output	Notes
Find Target	Example scripted node for finding target in certain radius. For now enemy is any character entity other than BT agent or player character. Return: True: Target found. False: Target not found.	Input: Radius: In what distance should target be searched. Output: Target: Target character. Outputs null if entity not found.

Character Tasks

Tasks that can be used only on characters. They will not work on vehicles, turrets, etc.

Name	Description	Parameters/Input/Output	Notes
Fire	Request fire action on controlled character. Return: True: Action was requested False: Requester is not a character
Change Stance	Request stance change on character. Return: True: Action request succeeded False: Action request failed	Parameters: Stance - Wanted Stance Prone Crouch Stand Input: Stance
Throw Grenade	Request throw grenade action on controlled character. Return: True: Action was requested False: Requester is not a character		This node might be obsoleted in future, depends on implementation of grenade throwing.
Character Raise Weapon	Request action to raise or lower weapon. Return: True: Action was requested False: Requester is not a character	Parameters: Raise True False
Character Set Movement Speed	Request change of movement type on controlled entity. Return: True: Action was requested False: Requester is not a character	Parameters: Movement type - Wanted movement speed Idle Walk Run Sprint
Play Gesture	Attempts to find a gesture by name and request it. Returns: True: If succeeded False: Gesture not found	Parameters: Gesture: Pick gesture type from the list Greeting Point finger Thumb up Thumb down Silence Middle finger Timeout Heart Facepalm Watching Hold Listening Point at myself Look at me Play: Play gesture if TRUE; Stop gesture if FALSE
Perform Object Action	Finds and performs action on object, for example open door. Returns: True: Action found and attempted False: no object, no character or no action	Input Action Entity

Waypoints

Tasks related for handling waypoints.

Name	Description	Parameters/Input/Output	Notes
Get Waypoint	Finds and returns waypoint with selected index.	Parameters: Index - From 0 up, index of waypoint in current queue Input: Index Output: Waypoint Behavior Contact behavior Danger behavior

Group

Tasks related to group management.

Name	Description	Parameters/Input/Output	Notes
Get Group children	Iterates through array of group children, and output child of current index as variable. It can be specified which indexes should be iterated through. Return: True: Entity found False: Invalid or empty group	Parameters: Index from: Which should be starting index in an array. (Default: 0) Index to: Which should be max index to select. (-1 by default, to go through whole array) Return controlled entity: Return controlled entity, if false, return AI Agent. Output: Entity	Example: Behavior tree that will cause all children of the group stop. This BT has to be called multiple times, as Get Group children only stores correct index of array, but cannot call anything multiple times. Note: This handling of "forEach" might change in the future.
Create Group			This seems to be WIP node.

Perception

Tasks related to AI Agent perception, which is basic source for finding threats and targets.

Name	Description	Parameters/Input/Output	Notes
Pick Target	Picks one target from known target list, and output it as variable. Return: True: Target found and assigned False: No target found	Output: Entity

Action Tasks

Task nodes helping with performing actions.

Name	Description	Parameters/Input/Output	Notes
Request Action	Attempt to request specified action on controlled entity. Return: True: Action requested succesfully False: Invalid action requested, or unable to complete request.	Parameters: Action name - as defined by input configuration Action value Input: Action name Action value

Smart Actions

Tasks related to smart actions. Smart actions are objects in world, with which AI can interact. Bench can have smart action for sitting.

Name	Description	Parameters/Input/Output	Notes
Perform Smart Action	Makes controlled entity to perform smart action Return: True: Smart action assigned to entity. False: Smart action assignment failed.	Input: Smart action
Find Smart Action	Allows finding smart object in the world which support smart action and save it into variable. If multiple smart actions found, random is selected. Return: True: Smart action found. False: Smart action not found.	Parameters Radius: The radius to search for actions within. Tags: Tags of smart action Tags test: Way of testing tags Output: Smart action
Get Current Smart Action	Get smart action object currently realised by Agent. Return: True: Always.	Output: Smart action
Get Smart Action Pos	Get position of given smart action. Return: True: Always.	Input: Smart action Output: Action pos
Get Smart Action BT	Returns behavior tree for given smart action. Return: True: Always.	Input: Smart action Output: Behavior

Experimental / Work in Progress

These nodes might not be finished or are used in some experimental or unfinished systems. These nodes are changed often, so it's not recommended to use them.

Name	Description	Parameters	Notes
Flocking	Implements features	Parameters: Separation distance Neighborhood radius Accumulation type Ground Aerial
Get Random Point
Scripted Target	Allows for overriding in scripts