OnlyNPC:Part1

Assets/Scripts/AI NPC/BehavourTreeCore.cs

@@ -0,0 +1,44 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+public enum NodeState
+{
+    Success, Failure, Running
+}
+
+public abstract class Node
+{
+    protected NodeState state;
+    public NodeState State => state;
+    public abstract NodeState Evaluate();
+}
+
+public class Selector : Node
+{
+    protected List<Node> nodes = new List<Node>(); // children nodes
+    
+    public Selector(List<Node> nodes)
+    {
+        this.nodes = nodes;
+    }
+    
+    public override NodeState Evaluate()
+    {
+        foreach (var node in nodes)
+        {
+            switch (node.Evaluate())
+            {
+                case NodeState.Failure:
+                    continue;
+                case NodeState.Success:
+                    state = NodeState.Success;
+                    return state;
+                case NodeState.Running:
+                    state = NodeState.Running;
+                    return state;
+            }
+        }
+        state = NodeState.Failure;
+        return state;
+    }
+}