Combining FSMs and decision trees

Given the previous recipes' ease of implementation and learning, we can combine them to develop a powerful decision-making system with benefits from both worlds, making it a very powerful technique in many different scenarios.

Getting ready

We will learn how to make modifications and develop child classes in order to create a finite-state machine that is capable of creating complex transitions based on decision trees.

How to do it...

This recipe relies on creating a couple of child classes from the one we already know and making a little modification:

1. Create a new action class that holds a reference to a state:

   using UnityEngine;
   using System.Collections;
   
   public class ActionState : DecisionTreeNode
   {
       public State state;
   
       public override DecisionTreeNode MakeDecision()
       {
           return this;
       }
   }

2. Implement a transition class that is able to hold a decision tree:

   using UnityEngine;
   using System.Collections;
   
   public class TransitionDecision :...