diff --git a/Assets/Scripts/umamusume/Gallop/Live/Director.cs b/Assets/Scripts/umamusume/Gallop/Live/Director.cs
index b250a1d..4a2dca8 100644
--- a/Assets/Scripts/umamusume/Gallop/Live/Director.cs
+++ b/Assets/Scripts/umamusume/Gallop/Live/Director.cs
@@ -445,7 +445,7 @@ namespace Gallop.Live
                 _uvScrollAccum[data.name] = Vector2.zero;
             _uvScrollAccum[data.name] += new Vector2(keyData.scrollSpeedX, keyData.scrollSpeedY) * Time.deltaTime;
             Vector2 totalOffset = new Vector2(keyData.scrollOffsetX, keyData.scrollOffsetY) + _uvScrollAccum[data.name];
-            foreach (var r in _stageController.GetComponentsInChildren<Renderer>())
+            foreach (var r in _stageController.GetComponentsInChildren<Renderer>(true))
             {
                 foreach (var mat in r.materials)
                 {
diff --git a/Assets/Scripts/umamusume/Gallop/Live/StageController.cs b/Assets/Scripts/umamusume/Gallop/Live/StageController.cs
index 3dd6a05..46072de 100644
--- a/Assets/Scripts/umamusume/Gallop/Live/StageController.cs
+++ b/Assets/Scripts/umamusume/Gallop/Live/StageController.cs
@@ -42,6 +42,14 @@ namespace Gallop.Live
             }
         }
 
+        // Objects controlled by timeline handlers (BlinkLight / WashLight / Spotlight3d / Laser)
+        // start inactive; their handlers call SetActive(true) when the track fires.
+        private static bool IsTimelineControlledLight(string name) =>
+            name.Contains("blinklight") ||
+            name.Contains("spotlight3d") ||
+            name.Contains("_wash_") ||
+            name.Contains("laser");
+
         public void InitializeStage()
         {
             foreach (GameObject stage_part in _stageObjects)
@@ -51,8 +59,8 @@ namespace Gallop.Live
                 {
                     if (!StageObjectMap.ContainsKey(child.name))
                     {
-                        if (child.name.Contains("light"))
-                            child.gameObject.SetActive(false);  // hidden by default, handlers activate as needed
+                        if (IsTimelineControlledLight(child.name))
+                            child.gameObject.SetActive(false);
                         var tmp_name = child.name.Replace("(Clone)", "");
                         StageObjectMap.Add(tmp_name, child.gameObject);
                         StageParentMap.TryAdd(tmp_name, child.gameObject.transform.parent);
diff --git a/CLAUDE.md b/CLAUDE.md
index e079e9c..c4bef89 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -56,7 +56,7 @@ StageController.cs        ← manages stage GameObjects, StageObjectMap
 
 **Important:** `LiveTimelineKeyWithInterpolate` already declares `frame`, `attribute`, `interpolateType`, `curve`, `easingType` — do NOT redeclare these in subclasses.
 
-**StageObjectMap:** Stage child GameObjects are indexed by name. Objects with "light" in their name start `SetActive(false)` but ARE registered — handlers call `SetActive(true)` as needed.
+**StageObjectMap:** Stage child GameObjects are indexed by name. Objects whose names match `IsTimelineControlledLight()` (`blinklight`, `spotlight3d`, `_wash_`, `laser`) start `SetActive(false)` — their handlers call `SetActive(true)` when the track fires. All other objects (neonsigns, glow meshes, UV scroll objects, etc.) keep their prefab default state.
 
 ## Currently Implemented Tracks
 
@@ -66,7 +66,8 @@ StageController.cs        ← manages stage GameObjects, StageObjectMap
 | CharaMotionSequence | existing | |
 | Facial / LipSync / FormationOffset | existing | |
 | GlobalLight (48) | existing | sets rim light shader props on characters |
-| BgColor1/2 | existing | sets toon shader color props |
+| BgColor1 | existing | sets toon shader color props on characters (`_CharaColor`, `_ToonDarkColor`, etc.) |
+| BgColor2 | existing | sets `_AmbientColor` on stage renderers via `Lerp(color1, color2, value)` |
 | Transform / Object | existing | handled by `StageController.cs` |
 | Effect (60) | `LiveTimelineEffectData` | loads prefab from `3d/effect/live/pfb_{name}` |
 | GlobalFog (49) | `LiveTimelineGlobalFogData` | sets `RenderSettings.fog*` |
diff --git a/LIVE_DEV_MAP.md b/LIVE_DEV_MAP.md
index d6ccfb6..cf67dc5 100644
--- a/LIVE_DEV_MAP.md
+++ b/LIVE_DEV_MAP.md
@@ -58,7 +58,7 @@ Toon shader 已移植，卡住的主要是全屏后处理和几个逆向未完
 | 轨道 | 状态 |
 |------|------|
 | GlobalFog (49) | ✅ fogColor / fogMode / fogDensity / fogStart / fogEnd |
-| BgColor2 (9) | ⚠️ 接线完成，`RenderSettings.ambient*` 打错目标（见卡点） |
+| BgColor2 (9) | ✅ 写含 `_AmbientColor` 属性的舞台材质，`Lerp(color1, white, value)` |
 
 ### URP Volume / RendererFeature
 | 轨道 | 状态 |
@@ -91,7 +91,6 @@ Toon shader 已移植，卡住的主要是全屏后处理和几个逆向未完
 
 | 轨道 | 不明白什么 |
 |------|-----------|
-| BgColor2 (9) | entry 名 `BgWashA`～`J` 在所有 bundle 里找不到；舞台 shader 不响应 `RenderSettings.ambient`（15/58 首）|
 | MonitorControl (10) | `dispID` 0–15 不对应 monitor 材质索引，内容资源路径未知；颜色/UV 控制可先做（★★/58 首）|
 | AdditionalLight (82) | 字段未 dump，结构未知（22/58 首）|
 
@@ -127,7 +126,7 @@ Toon shader 已移植，卡住的主要是全屏后处理和几个逆向未完
 | `Assets/Scripts/umamusume/Gallop/Live/Cutt/LiveTimelineControl.cs` | 每帧插值 + 事件触发 |
 | `Assets/Scripts/umamusume/Gallop/Live/Cutt/LiveTimelineWorkSheet.cs` | 所有轨道字段声明 |
 | `Assets/Scripts/umamusume/Gallop/Live/Cutt/LiveTimelineDataList/` | 各轨道数据类 |
-| `Assets/Scripts/umamusume/Gallop/Live/StageController.cs` | StageObjectMap（按名字查舞台对象）|
+| `Assets/Scripts/umamusume/Gallop/Live/StageController.cs` | StageObjectMap（按名字查舞台对象）；`IsTimelineControlledLight()` 决定哪些对象默认 inactive（`blinklight`/`spotlight3d`/`_wash_`/`laser`）|
 | `Assets/Resources/RenderPipeline/UMAUniversalRenderPipelineAsset_Renderer.asset` | RendererFeature 注册位置 |
 | `LIVE_TRACKS.md` | 103 条轨道全览（ID/覆盖率/状态/Bug）|
 | `live-shader-todo.md` | 后处理轨道实现细节 |
diff --git a/LIVE_TRACKS.md b/LIVE_TRACKS.md
index e413b38..47ba37f 100644
--- a/LIVE_TRACKS.md
+++ b/LIVE_TRACKS.md
@@ -32,7 +32,7 @@ originSessionId: 319ae839-0292-4b1e-80de-2f3c91b1f40e
 | 6 | Event | 时间轴触发事件 | ❌ | — |
 | 7 | CharaMotionSequence ★(5) | 角色动作序列切换 | ✅ | — |
 | 8 | BgColor1 ★(13) | 角色色调/轮廓/阴影颜色 | ✅ | — |
-| 9 | BgColor2 ★(1) | 背景渐变/环境色（两色混合）【15/58首】 | ⚠️ | 当前用RenderSettings.ambient*近似，但舞台shader不响应Unity实时光照，实际shader属性名待确认 |
+| 9 | BgColor2 ★(1) | 背景渐变/环境色（两色混合）【15/58首】 | ✅ | 写含 `_AmbientColor` 属性的舞台材质，颜色 = `Lerp(color1, color2, value)`；color2 恒为白色 |
 | 10 | MonitorControl ★(2) | LED舞台屏幕内容控制 | ❌ | — |
 | 11 | CameraSwitcher | 切换活动摄像机 | ✅ | — |
 | 12 | LipSync | 口型同步 | ✅ | — |
@@ -90,7 +90,7 @@ originSessionId: 319ae839-0292-4b1e-80de-2f3c91b1f40e
 | 43 | WashLight | 洗光灯 SetActive+颜色亮度 | ⚠️ | RaycastDistance/CameraProjectionSide/MulColor0未使用 |
 | 44 | Laser | 激光灯变换+SetActive | ⚠️ | blinkRate/blinkOffset/rotateFollowCamera/RaycastDistance未实现 |
 | 45 | BlinkLight ★(9) | 频闪灯亮灭周期/颜色/亮度 | ⚠️ | color1Array/LightBlendMode/isReverseHueArray未使用 |
-| 46 | UVScrollLight ★(1) | 材质UV滚动灯光效果 | ⚠️ | scrollSpeedX/Y误用SetTextureScale（应每帧累积offset）；mulColor1/ColorType/CharacterIndex等未使用 |
+| 46 | UVScrollLight ★(1) | 材质UV滚动灯光效果 | ⚠️ | mulColor1/ColorType/CharacterIndex等未使用 |
 | 47 | FacialToon | 角色卡通着色参数 | ❌ | — |
 | 48 | GlobalLight ★(2) | 全局光方向/RimLight参数 | ✅ | — |
 | 49 | GlobalFog ★(1) | 全局雾效（颜色/密度/范围） | ✅ | — |