---
title: "Nodes"
content_type: tutorial
url: "https://learn.unity.com/tutorial/nodes-jxw?language=en"
language: en
difficulty: intermediate
duration_minutes: 15
unity_version:
  - "2021.3"
supported_unity_versions:
  - name: "2021.3"
    url: "https://learn.unity.com/tutorial/nodes-jxw.md?language=en&version=2021.3"
  - name: "2021.1"
    url: "https://learn.unity.com/tutorial/nodes-jxw.md?language=en&version=2021.1"
  - name: "2020.3"
    url: "https://learn.unity.com/tutorial/nodes-jxw.md?language=en&version=2020.3"
  - name: "2020.2"
    url: "https://learn.unity.com/tutorial/nodes-jxw.md?language=en&version=2020.2"
available_languages:
  - name: "en"
    url: "https://learn.unity.com/tutorial/nodes-jxw.md?language=en"
  - name: "ja"
    url: "https://learn.unity.com/tutorial/nodo-wuy2.md?language=ja"
last_updated: "2026-08-04T14:23:50.000Z"
---

# Nodes

Write the initial class for a behavior tree system that will support most of the technique’s functionality.

In this lecture students will write the first class for the behaviour tree system that will underwrite the majority of the functionality for the technique.

## Materials

- [GalleryStarter.zip](https://unity-connect-prd.storage.googleapis.com/20210331/e8d15093-139b-42d5-9c56-88a69588d8d9/GalleryStarter.zip)

## 1. Nodes

[Video](https://connect-mediagw.unity.com/h1/20220916/videos/34cac846-5066-41d6-b01e-32a4743888f0_S1102.mp4) ([Transcript (en)](https://connect-mediagw.unity.com/h1/20221012/5dd7d65b-726a-4425-b68b-e13aaf010abe_S1102.vtt))