敵AI Ver.1

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Assets/Scripts/EnemyAI.cs

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+using UnityEngine;
+using UnityEngine.AI;
+using System.Collections;
+
+[RequireComponent(typeof(NavMeshAgent))]
+public class EnemyAI : MonoBehaviour
+{
+    // 敵の状態を定義する列挙型（FSM）
+    public enum AIState { Wander, Chase }
+
+    [Header("現在の状態")]
+    [SerializeField] private AIState currentState = AIState.Wander;
+
+    [Header("索敵設定")]
+    [Tooltip("プレイヤーを検知する距離")]
+    [SerializeField] private float detectionRange = 10f;
+    [Tooltip("プレイヤーを見失う距離（検知距離より広く設定するのがコツ）")]
+    [SerializeField] private float loseRange = 15f;
+    [Tooltip("プレイヤーのタグ名")]
+    [SerializeField] private string playerTag = "Player";
+
+    [Header("徘徊（Wander）設定")]
+    [SerializeField] private float wanderRadius = 8f;
+    [SerializeField] private float minWaitTime = 0.1f;
+    [SerializeField] private float maxWaitTime = 1f;
+
+    [Tooltip("目的地に向けて移動を開始してから、何秒で諦めるか")]
+    [SerializeField] private float wanderTimeout = 7f;
+
+    private NavMeshAgent agent;
+    private Transform playerTransform;
+    private bool isWandering = false;
+
+    void Start()
+    {
+        agent = GetComponent<NavMeshAgent>();
+
+        // 負荷軽減のため、AIの思考ループをコルーチンで開始（毎フレーム Update で処理しない）
+        StartCoroutine(AILoop());
+    }
+
+    // AIの意思決定を行うメインループ（0.2秒ごとに実行して負荷を劇的に下げる）
+    private IEnumerator AILoop()
+    {
+        while (true)
+        {
+            // 1. プレイヤーを探す（まだ見つけていない場合のみ）
+            if (playerTransform == null)
+            {
+                FindPlayer();
+            }
+
+            // 2. 現在のステート（状態）に応じて処理を分岐
+            switch (currentState)
+            {
+                case AIState.Wander:
+                    WanderBehavior();
+                    break;
+
+                case AIState.Chase:
+                    ChaseBehavior();
+                    break;
+            }
+
+            // 毎フレームではなく、0.2秒（1秒に5回）だけ実行する（Quest 3向けの最適化）
+            yield return new WaitForSeconds(0.2f);
+        }
+    }
+
+    // シーン内からプレイヤー（タグ付き）を探すメソッド
+    private void FindPlayer()
+    {
+        GameObject playerObj = GameObject.FindGameObjectWithTag(playerTag);
+        if (playerObj != null)
+        {
+            playerTransform = playerObj.transform;
+        }
+    }
+
+    // ─── 【徘徊状態】の行動 ───
+    private void WanderBehavior()
+    {
+        if (playerTransform != null)
+        {
+            // プレイヤーとの距離を計算
+            float distanceToPlayer = Vector3.Distance(transform.position, playerTransform.position);
+            
+            // 索敵範囲内に入ったら「追跡状態」へ遷移
+            if (distanceToPlayer <= detectionRange)
+            {
+                currentState = AIState.Chase;
+                isWandering = false;
+                agent.ResetPath(); // 徘徊の目的地をリセット
+                Debug.Log($"👁️ {gameObject.name}: プレイヤーを発見！ 追跡します。");
+                return;
+            }
+        }
+
+        // 徘徊の移動ロジック
+        if (!isWandering)
+        {
+            StartCoroutine(WanderMoveRoutine());
+        }
+    }
+
+    private IEnumerator WanderMoveRoutine()
+    {
+        isWandering = true;
+
+        // ランダムな目的地を取得して移動開始
+        Vector3 newPos = GetRandomNavMeshPoint(transform.position, wanderRadius);
+        agent.SetDestination(newPos);
+
+        float elapsedTime = 0f; // 経過時間を計るカウンター
+
+        // 目的地に到着するまで待つ（ただしタイムアウト時間を超えたらループを抜ける）
+        while (agent.remainingDistance > agent.stoppingDistance)
+        {
+            // 0.5秒ごとにチェック
+            yield return new WaitForSeconds(0.5f);
+            elapsedTime += 0.5f;
+
+            // 【スタック対策】設定した制限時間を超えた場合
+            if (elapsedTime >= wanderTimeout)
+            {
+                Debug.Log($"⚠️ {gameObject.name}: 目的地（{newPos}）に到達できないため諦めました。");
+                
+                agent.ResetPath(); // 動けない経路（バグ目的地）を一旦クリアする
+                break;             // whileループを強制終了して次の目的地設定へ進める
+            }
+        }
+
+        // 到着後（または諦めた後）、ランダムな時間だけその場で待機して次の徘徊へ
+        yield return new WaitForSeconds(Random.Range(minWaitTime, maxWaitTime));
+        isWandering = false;
+    }
+
+    // ─── 【追跡状態】の行動 ───
+    private void ChaseBehavior()
+    {
+        if (playerTransform == null)
+        {
+            currentState = AIState.Wander;
+            return;
+        }
+
+        float distanceToPlayer = Vector3.Distance(transform.position, playerTransform.position);
+
+        // 見失う距離（loseRange）を超えたら「徘徊状態」に戻る
+        if (distanceToPlayer > loseRange)
+        {
+            currentState = AIState.Wander;
+            agent.ResetPath();
+            Debug.Log($"❓ {gameObject.name}: プレイヤーを見失った。徘徊に戻ります。");
+            return;
+        }
+
+        // プレイヤーの位置を目的地に設定（0.2秒ごとに更新されるため、滑らかに追従します）
+        agent.SetDestination(playerTransform.position);
+    }
+
+    // NavMesh上のランダムな座標を取得する補助メソッド
+    private Vector3 GetRandomNavMeshPoint(Vector3 center, float radius)
+    {
+        Vector3 randomDirection = Random.insideUnitSphere * radius;
+        randomDirection += center;
+        NavMeshHit hit;
+        if (NavMesh.SamplePosition(randomDirection, out hit, radius, NavMesh.AllAreas))
+        {
+            return hit.position;
+        }
+        return center;
+    }
+
+    // 【視覚的なデバッグ用】エディタ上で索敵範囲を線で表示する
+    private void OnDrawGizmosSelected()
+    {
+        // 索敵範囲（赤）
+        Gizmos.color = Color.red;
+        Gizmos.DrawWireSphere(transform.position, detectionRange);
+
+        // 見失う範囲（黄）
+        Gizmos.color = Color.yellow;
+        Gizmos.DrawWireSphere(transform.position, loseRange);
+    }
+}

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+  openxrExtensionStrings: XR_ANDROID_trackables XR_ANDROID_device_anchor_persistence
   company: Unity Technologies
   priority: 0
   targetOpenXRApiVersion: