摄像机区域的架构改动

Assets/_Game/Scripts/World/Liquid/UnderwaterPostProcessingController.cs

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+// Assets/Scripts/World/Liquid/UnderwaterPostProcessingController.cs
+using System.Collections;
+using BaseGames.Core.Events;
+using UnityEngine;
+using UnityEngine.Rendering;
+
+namespace BaseGames.World.Liquid
+{
+    public class UnderwaterPostProcessingController : MonoBehaviour
+    {
+        [SerializeField] private Volume               _underwaterVolume;    // 水下专属 Volume（WeightMode）
+        [SerializeField] private float                _blendInDuration  = 0.3f;
+        [SerializeField] private float                _blendOutDuration = 0.3f;
+        [SerializeField] private LiquidEventChannelSO _onLiquidEntered;    // EVT_LiquidEntered
+        [SerializeField] private LiquidEventChannelSO _onLiquidExited;     // EVT_LiquidExited
+
+        private Coroutine _blendCoroutine;
+        private readonly CompositeDisposable _subs = new();
+
+        private void OnEnable()
+        {
+            _onLiquidEntered?.Subscribe(OnLiquidEntered).AddTo(_subs);
+            _onLiquidExited?.Subscribe(OnLiquidExited).AddTo(_subs);
+        }
+
+        private void OnDisable() => _subs.Clear();
+
+        private void OnLiquidEntered(LiquidEvent evt)
+        {
+            if (evt.LiquidType != LiquidType.Water) return;
+            BlendVolume(1f, _blendInDuration);
+        }
+
+        private void OnLiquidExited(LiquidEvent evt)
+        {
+            if (evt.LiquidType != LiquidType.Water) return;
+            BlendVolume(0f, _blendOutDuration);
+        }
+
+        private void BlendVolume(float target, float duration)
+        {
+            if (_blendCoroutine != null) StopCoroutine(_blendCoroutine);
+            _blendCoroutine = StartCoroutine(BlendRoutine(target, duration));
+        }
+
+        private IEnumerator BlendRoutine(float target, float duration)
+        {
+            if (_underwaterVolume == null) yield break;
+            float start   = _underwaterVolume.weight;
+            float elapsed = 0f;
+            while (elapsed < duration)
+            {
+                elapsed += Time.deltaTime;
+                _underwaterVolume.weight = Mathf.Lerp(start, target, elapsed / duration);
+                yield return null;
+            }
+            _underwaterVolume.weight = target;
+        }
+    }
+}