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Your guide to using NodeCanvas in Unity

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;

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);

//Start the behaviour tree with a target agent (this in this case),

//and an optional parent blackboard (null in this case, so only the local graph blackboard is used.

//Update mode determines when the graph updates (can be Manual).

bt.StartGraph(this, null, Graph.UpdateMode.NormalUpdate);

}

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Last updated on April 4, 2025

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