HPbarzissou

Assets/_Scripts/EnemyHealthBar.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+public class EnemyHealthBar : MonoBehaviour
+{
+    [Header("UI設定")]
+    [SerializeField] private Slider hpSlider;
+    [SerializeField] private EnemyHealth targetEnemyHealth;
+
+    [Header("追従設定")]
+    [Tooltip("敵の原点から頭上へどれだけ浮かせるか（メートル）")]
+    [SerializeField] private Vector3 offset = new Vector3(0, 2.0f, 0);
+
+    private Transform targetTransform;
+    private Transform mainCameraTransform;
+
+    private void Start()
+    {
+        // ターゲットのEnemyHealthを自動検索
+        if (targetEnemyHealth == null)
+        {
+            targetEnemyHealth = GetComponentInParent<EnemyHealth>();
+        }
+
+        if (targetEnemyHealth != null)
+        {
+            targetTransform = targetEnemyHealth.transform;
+            targetEnemyHealth.OnHealthChanged += UpdateHp;
+            targetEnemyHealth.OnDeath += HandleDeath;
+
+            UpdateHp(targetEnemyHealth.CurrentHealth, targetEnemyHealth.MaxHealth);
+        }
+
+        if (Camera.main != null)
+        {
+            mainCameraTransform = Camera.main.transform;
+        }
+    }
+
+    private void OnDestroy()
+    {
+        if (targetEnemyHealth != null)
+        {
+            targetEnemyHealth.OnHealthChanged -= UpdateHp;
+            targetEnemyHealth.OnDeath -= HandleDeath;
+        }
+    }
+
+    private void LateUpdate()
+    {
+        if (targetTransform == null || mainCameraTransform == null) return;
+
+        // 1. 敵の頭上に位置を追従
+        transform.position = targetTransform.position + offset;
+
+        // 2. 常にカメラの向きへ正対（ビルボード処理：鏡像反転を防ぐためカメラの向きと平行にする）
+        transform.forward = mainCameraTransform.forward;
+    }
+
+    private void UpdateHp(float current, float max)
+    {
+        if (hpSlider != null)
+        {
+            hpSlider.maxValue = max;
+            hpSlider.value = current;
+        }
+    }
+
+    private void HandleDeath()
+    {
+        // 敵が死んだらバーを即座に非表示
+        gameObject.SetActive(false);
+    }
+}