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unity/Assets/Light/scripts/SceneInteraction.cs

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+using UnityEngine;
+using System.Collections;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 场景交互点 —— 玩家走到指定物体附近，按 Q 触发过场。
+    /// 触发后主角的光圈逐渐扩大，最终点亮整个场景（PPT式过渡）。
+    ///
+    /// 挂载位置：场景中的交互物件（如祭坛、机关、特殊NPC等）
+    /// 需要：物体上有 Collider + 勾选 IsTrigger
+    /// 玩家需要 Tag = "Player"
+    /// </summary>
+    public class SceneInteraction : MonoBehaviour
+    {
+        [Header("交互设置")]
+        [SerializeField] private KeyCode interactKey = KeyCode.Q;
+        [Tooltip("玩家进入此范围才能交互")]
+        [SerializeField] private float interactionRadius = 3f;
+
+        [Header("过场参数")]
+        [Tooltip("光圈扩大的持续时间（秒），类似PPT过场")]
+        [SerializeField] private float transitionDuration = 5f;
+
+        [Tooltip("最终光圈半径（要覆盖整个场景的话设大一点）")]
+        [SerializeField] private float finalLightRadius = 60f;
+
+        [Tooltip("最终全局最小亮度（0.6=全场景可见但偏暗, 1.0=全亮）")]
+        [SerializeField, Range(0f, 1f)] private float finalMinBrightness = 0.7f;
+
+        [Header("引用")]
+        [Tooltip("玩家的 LightSource 组件（必须已挂载）")]
+        [SerializeField] private LightSource playerLightSource;
+
+        [Tooltip("交互提示 UI（可选，玩家靠近时显示）")]
+        [SerializeField] private GameObject interactionPrompt;
+
+        [Header("音效（可选）")]
+        [SerializeField] private AudioSource interactionSFX;
+
+        // 状态
+        private bool _triggered = false;
+        private bool _playerInRange = false;
+        private Transform _player;
+
+        private void Start()
+        {
+            // 自动查找玩家
+            GameObject playerObj = GameObject.FindGameObjectWithTag("Player");
+            if (playerObj != null)
+            {
+                _player = playerObj.transform;
+                if (playerLightSource == null)
+                    playerLightSource = playerObj.GetComponent<LightSource>();
+            }
+
+            if (interactionPrompt != null)
+                interactionPrompt.SetActive(false);
+        }
+
+        private void Update()
+        {
+            if (_triggered) return;
+
+            // 检测玩家是否在范围内
+            if (_player != null)
+            {
+                float dist = Vector3.Distance(transform.position, _player.position);
+                _playerInRange = dist <= interactionRadius;
+            }
+
+            // 显示/隐藏交互提示
+            if (interactionPrompt != null)
+                interactionPrompt.SetActive(_playerInRange);
+
+            // 检测 Q 键
+            if (_playerInRange && Input.GetKeyDown(interactKey))
+            {
+                StartCoroutine(ExpandLightTransition());
+            }
+        }
+
+        /// <summary>
+        /// 过场协程：光圈逐渐扩大 + 全局亮度提升
+        /// </summary>
+        private IEnumerator ExpandLightTransition()
+        {
+            _triggered = true;
+
+            // 隐藏交互提示
+            if (interactionPrompt != null)
+                interactionPrompt.SetActive(false);
+
+            // 播放音效
+            if (interactionSFX != null)
+                interactionSFX.Play();
+
+            // 记录初始值
+            float startRadius = playerLightSource != null ? playerLightSource.Radius : 5f;
+            float startBrightness = LightMaskSystem.Instance != null ? 0f : 0f;
+
+            float elapsed = 0f;
+
+            // 过程：平滑插值扩大
+            while (elapsed < transitionDuration)
+            {
+                elapsed += Time.deltaTime;
+                float t = elapsed / transitionDuration;
+
+                // SmoothStep 插值（开始和结束都柔和）
+                float smoothT = t * t * (3f - 2f * t);
+
+                // 扩大玩家光圈半径
+                if (playerLightSource != null)
+                    playerLightSource.SetRadius(Mathf.Lerp(startRadius, finalLightRadius, smoothT));
+
+                // 提升全局最小亮度（让黑暗区域也逐渐可见）
+                if (LightMaskSystem.Instance != null)
+                    LightMaskSystem.Instance.SetMinBrightness(Mathf.Lerp(startBrightness, finalMinBrightness, smoothT));
+
+                yield return null;
+            }
+
+            // 确保最终值
+            if (playerLightSource != null)
+                playerLightSource.SetRadius(finalLightRadius);
+
+            if (LightMaskSystem.Instance != null)
+                LightMaskSystem.Instance.SetMinBrightness(finalMinBrightness);
+
+            Debug.Log("[SceneInteraction] 过场完成，场景已全部点亮");
+        }
+
+        // ===== 编辑器可视化 =====
+
+        private void OnDrawGizmosSelected()
+        {
+            Gizmos.color = new Color(0f, 1f, 0f, 0.3f);
+            Gizmos.DrawWireSphere(transform.position, interactionRadius);
+        }
+    }
+}