Behavior Trees In Unity

Creating a Behavior Tree with Scriptable Objects

Source: https://thekiwicoder.com/wp-content/uploads/2021/07/behaviour_tree-2.jpg

Behavior Tree Concept

Creating the Behavior Tree

The Node

State Enum
Has the Node Started
Node Abstract Methods
Pseudo Code for Update Method
Completed Update Method
Invert If Statement
Abstract Node Unity Object

The Behavior Tree

Create Behavior Tree
Create Asset Menu
Root Node
State of Tree
Behavior Tree Update Method

Node Sub-types.

Decorator Node
Composite Node
Action Node
Debug Log Action Node
Debug Log Node completed.

Creating and running the Tree

Behavior Tree Runner
Behavior Tree Runner Update Method
Behavior Tree Runner Start Method for Testing
Behavior Tree Runner Game Object

Make things more interesting.

Repeat Node
Behavior Tree Runner Start Method for Testing Added Repeat Node
Repeat Decorator Node Running
Sequencer Node
Sequencer Node On Update
On Update if pattern and switch expression explained
Behavior Tree Runner Start Method for Testing Added Sequencer Node
Sequencer Composite Node Running
Wait Action Node
Behavior Tree Runner Start Method for Testing Added Wait Node

What’s Next

Get The Code.

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James Lafritz

Excited about changing my hobby into a new carer with GameDevHQ course.