# 5.5中Lumen在SceneCapture2D中的表现似乎明显有问题 

**URL:** <https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591>\
**Category:** 简体中文 (Simplified Chinese)\
**Tags:** unreal-engine, Epic-Pro-Support, question\
**Created:** [September 25, 2025, 3:15am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591 "2025-09-25T03:15:00Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![anonymous-edc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\
**Post date:** [September 25, 2025, 3:15am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/1 "2025-09-25T03:15:00Z")

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官方5.5引擎，Lumen在SceneCapture2D中的表现似乎明显有问题，SceneCapture2D设置中是开启了Lumen的，这个可能是什么原因？

[Image Removed]

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**Author:** ![anonymous-edc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\
**Post date:** [September 25, 2025, 3:15am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/2 "2025-09-25T03:15:05Z")

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**重现步骤**  
1、启动附件项目

2、对比关卡编辑器中的Lumen效果与SceneCapture2D的RT中的Lumen效果

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**Author:** ![Wenlei.Li](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Wenlei.Li](https://forums.unrealengine.com/u/Wenlei.Li)\
**Post date:** [September 25, 2025, 9:17am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/3 "2025-09-25T09:17:42Z")

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Scenecapture中这个开了吗

[Image Removed]另外我试了下5.6应该是没有问题的

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**Author:** ![Wenlei.Li](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Wenlei.Li](https://forums.unrealengine.com/u/Wenlei.Li)\
**Post date:** [September 25, 2025, 11:26am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/4 "2025-09-25T11:26:46Z")

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应该是个bug，5.6看起来已经修复了可以支持软光追和SurfaceCache，暂时没有找到对应的​修复changelist，我可以再问问。5.5可能就得硬件光追+Hitlighting了

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**Author:** ![anonymous-edc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\
**Post date:** [September 25, 2025, 9:31am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/5 "2025-09-25T09:31:35Z")

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开关这个似乎没有效果，我这边测试得到需要把这个CaptureSource改为FinalColor这几种才比较正常，未使用FinalColor模式时EyeAdaptation不生效，这里的ViewExposure为0，导致LumenDirectLighting全黑。[Image Removed]

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**Author:** ![Wenlei.Li](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Wenlei.Li](https://forums.unrealengine.com/u/Wenlei.Li)\
**Post date:** [September 25, 2025, 10:29am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/6 "2025-09-25T10:29:26Z")

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恩，我也发现FinalColor会好些。但这应该不是问题的原因，自动曝光后虽然暗部变亮了但周围区域就过爆了，这就像强行提亮了效果。我看了下应该是只有屏幕空间的GI。

我又在5.5里测试了下，开启硬件光锥，并使用HitLighting就OK了，同时要开启上面提到的Use Raytracing if Enalbe。我再看下是个bug还是本来就不支持软追踪

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**Author:** ![Liu.Wei](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Liu.Wei](https://forums.unrealengine.com/u/Liu.Wei)\
**Post date:** [September 30, 2025, 1:33am UTC](https://forums.unrealengine.com/t/5-5-lumen-scenecapture2d/2669591/7 "2025-09-30T01:33:26Z")

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Hi，

我觉得应该是这个改动的修复，可以试一下 [https://github.com/EpicGames/UnrealEngine/commit/17b7f4149e98369371194b3f14e1dd1675eabfb6](https://github.com/EpicGames/UnrealEngine/commit/17b7f4149e98369371194b3f14e1dd1675eabfb6)