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When to use an Utility AI ?

While utility-based systems can be used in many types of games, they are more appropriate in situations where there are a large number of potentially competing actions the AI can take—often with no obvious “right answer.” In those times, the mathematical approach that utility-based systems employ is necessary to ferret out what the most reasonable action to take is. Aside from The Sims, other common areas where utility-based systems are appropriate are in RPGs, RTS, and simulations.

Source : http://intrinsicalgorithm.com/IAonAI/2012/11/ai-architectures-a-culinary-guide-gdmag-article/

How to start using xNodeUtilityAI

• Firstly, download the last release and import it into your Unity Project.
• Create a script MyAIBrain inheriting from AbstractAIBrain.
• Create a script MyAIComponent inheriting from AbstractAIComponent and add it to your GameObject.
• Create scripts inheriting from SimpleActionNode, SimpleEntryNode or CollectionEntryNode.
• Create a MyAIBrain using Unity ScriptableObject contextual menu.
• Add your custom nodes on the Node graph with UtilityFunctionNode and OptionNode.