NodeCanvas | Visual Behaviour Trees and State Machines for Unity

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Learn how to use NodeCanvas

17.5.Creating a Behaviour in Code

This is obviously an advanced topic, but it is very possible to create a graph completely in code. In the example below, a simple BehaviourTree is created.

using UnityEngine;

using NodeCanvas.Framework;

using NodeCanvas.BehaviourTrees;

using NodeCanvas.Tasks.Actions;

//Attach this component on a gameobject that has a BehaviourTreeOwner already attached.

public class Example : MonoBehaviour {

void Awake() {

//Create the Behaviour Tree

var bt = ScriptableObject.CreateInstance<BehaviourTree>();

//Sequencer root

var sequencer = bt.AddNode<Sequencer>();

//First ActionNode

var action1 = sequencer.AddChild<ActionNode>();

action1.task = Task.Create<Wait>(bt);

//Second ActionNode

var action2 = sequencer.AddChild<ActionNode>();

action2.task = Task.Create<Wait>(bt);

//Assign the BehaviourTree to the owner and enable it

var owner = GetComponent<BehaviourTreeOwner>();

owner.StartBehaviour(bt);

}

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