November 2018
Beginner
246 pages
5h 23m
English
book
Unity Artificial Intelligence Programming - Fourth Edition
by Dr. Davide Aversa, Aung Sithu Kyaw, Clifford Peters
Content preview from Unity Artificial Intelligence Programming - Fourth Edition
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Introduction to Behavior Trees
A Behavior Tree is a hierarchical tree of Nodes that controls the flow of the AI character's behavior. When we execute a Node, the node can return three states: success, failure, or running (if the node's execution is spread over multiple frames, for instance, if it plays an animation). When the BT executor runs a tree, it starts from the root and starts executing every node in order, according to rules written in the nodes themselves.
A Node can be of three types:
- A leaf (a node without children)
- A decorator (a node with a single child)
- A composite node (a node with multiple children)
In general, leaves represent the Action that the characters can do or know (that is why they are commonly called an Action ...
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