add unity project

add FSM examples

AI/Assets/Scripts/FSM/ChasePlayerState.cs

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+using UnityEngine;
+
+namespace DefaultNamespace.FSM
+{
+    public class ChasePlayerState : IState
+    {
+        private GameObject _owner;
+        private PlayerController _player;
+
+        public ChasePlayerState(GameObject owner, PlayerController player)
+        {
+            _owner = owner;
+            _player = player;
+        }
+        
+        public void Enter(IFiniteStateMachine ctx)
+        {
+            Debug.Log("CHASE: Enter");
+        }
+
+        public void Update(IFiniteStateMachine ctx)
+        {
+            Debug.Log("CHASE: Update");
+            
+            // player visibility check
+            if (Physics.Raycast(_owner.transform.position, _owner.transform.forward, out RaycastHit hit))
+            {
+                if (hit.transform.GetComponent<PlayerController>() != _player)
+                {
+                    ctx.SetState(new IdleState(_owner, _player, 60.0f));
+                }
+            }
+            else
+            {
+                ctx.SetState(new IdleState(_owner, _player, 60.0f));
+            }
+        }
+
+        public void Exit(IFiniteStateMachine ctx)
+        {
+            Debug.Log("CHASE: Exit");
+        }
+    }
+}

AI/Assets/Scripts/FSM/ChasePlayerState.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c7b0823b31e24c109b472e77ec48bf3b
+timeCreated: 1744128282

AI/Assets/Scripts/FSM/ChaseSystem.cs

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+using System;
+using UnityEngine;
+
+namespace DefaultNamespace.FSM
+{
+    public class ChaseSystem : MonoBehaviour, IFiniteStateMachine
+    {
+        [SerializeField] private IState _defaultState;
+        [SerializeField] private PlayerController _player;
+
+        private IState _currentState = null;
+
+        private void Awake()
+        {
+            // _currentState = _defaultState; // isn't working, because an interface can't be serialized by the Unity Serializer
+            _currentState = new IdleState(gameObject, _player, 60.0f);
+        }
+
+        private void Start()
+        {
+            _currentState?.Enter(this);
+        }
+
+        private void Update()
+        {
+            // if (_currentState == null) return;
+            _currentState?.Update(this);
+        }
+
+        public void SetState(IState state)
+        {
+            _currentState.Exit(this);
+            _currentState = state;
+            _currentState.Enter(this);
+        }
+    }
+}

AI/Assets/Scripts/FSM/ChaseSystem.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 99c993fa1e7746fa8c1f19ca160390c5
+timeCreated: 1744126665

AI/Assets/Scripts/FSM/IFiniteStateMachine.cs

@@ -0,0 +1,7 @@
+namespace DefaultNamespace.FSM
+{
+    public interface IFiniteStateMachine
+    {
+        void SetState(IState state);
+    }
+}

AI/Assets/Scripts/FSM/IFiniteStateMachine.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: a3f7abcc3bb1468dacaf26771b1a8641
+timeCreated: 1744127058

AI/Assets/Scripts/FSM/IState.cs

@@ -0,0 +1,26 @@
+namespace DefaultNamespace.FSM
+{
+    public interface IState
+    {
+        void Enter(IFiniteStateMachine ctx);
+        // IState Update(); // option 1 next state as return value
+        void Update(IFiniteStateMachine ctx); // option 2 we call setState when we want to change
+        void Exit(IFiniteStateMachine ctx);
+    }
+    
+    // alternative
+    // public interface IStateEnter
+    // {
+    //     void Enter(IFiniteStateMachine ctx);
+    // }
+    //
+    // public interface IStateUpdate
+    // {
+    //     void Update(IFiniteStateMachine ctx);
+    // }
+    //
+    // public interface IStateExit
+    // {
+    //     void Exit(IFiniteStateMachine ctx);
+    // }
+}

AI/Assets/Scripts/FSM/IState.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 575dd241edb84a3492106b17ba18fad8
+timeCreated: 1744126750

AI/Assets/Scripts/FSM/IdleState.cs

@@ -0,0 +1,48 @@
+using UnityEngine;
+
+namespace DefaultNamespace.FSM
+{
+    public class IdleState : IState
+    {
+        private GameObject _owner;
+        private PlayerController _player;
+
+        private float _viewAngle;
+        private float _cosViewAngle;
+
+        public IdleState(GameObject owner, PlayerController player, float viewAngle)
+        {
+            _owner = owner;
+            _player = player;
+            _cosViewAngle = Mathf.Cos(viewAngle * Mathf.Deg2Rad);
+        }
+        
+        public void Enter(IFiniteStateMachine ctx)
+        {
+            Debug.Log("IDLE: Enter");
+        }
+
+        public void Update(IFiniteStateMachine ctx)
+        {
+            Debug.Log("IDLE: Update");
+            
+            float angle = Vector3.Angle(_owner.transform.forward, _player.transform.position - _owner.transform.position);
+            // if (angle > _viewAngle)
+            // if (cosAngle > _cosViewAngle)
+            
+            // player visibility check
+            if (Physics.Raycast(_owner.transform.position, _owner.transform.forward, out RaycastHit hit))
+            {
+                if (hit.transform.GetComponent<PlayerController>() == _player)
+                {
+                    ctx.SetState(new ChasePlayerState(_owner, _player));
+                }
+            }
+        }
+
+        public void Exit(IFiniteStateMachine ctx)
+        {
+            Debug.Log("IDLE: Exit");
+        }
+    }
+}

AI/Assets/Scripts/FSM/IdleState.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 503155bb57a0476b8588d29f0b2be6a3
+timeCreated: 1744127402