# Squarish Flickering on translucent and reflective materials

**URL:** <https://forums.unrealengine.com/t/squarish-flickering-on-translucent-and-reflective-materials/2127894>\
**Category:** Rendering\
**Tags:** Reflections, unreal-engine, flickering\
**Created:** [November 16, 2024, 1:26pm UTC](https://forums.unrealengine.com/t/squarish-flickering-on-translucent-and-reflective-materials/2127894 "2024-11-16T13:26:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Erikwong](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Erikwong](https://forums.unrealengine.com/u/Erikwong)\
**Post date:** [November 16, 2024, 1:26pm UTC](https://forums.unrealengine.com/t/squarish-flickering-on-translucent-and-reflective-materials/2127894/1 "2024-11-16T13:26:03Z")

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Hi, I would like to ask about the lumen flickering issue I have this time is in squarish shape and mostly on translucent and reflective materials. I’ve set the Lumen final gather quality in PostProcessVolume to 32 did not help at all. I hope someone can help me to solve this weird problem with 5.3.2. Thanks. You may watch the sample video here: [UE5\_Flicker.mp4 - Google Drive](https://drive.google.com/file/d/1uA-TF-ywpwf0HWNp9UFx7zJEx7aVgcBd/view?usp=sharing)

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**Author:** ![Krzysztof.N](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Krzysztof.N](https://forums.unrealengine.com/u/Krzysztof.N)\
**Post date:** [November 16, 2024, 9:14pm UTC](https://forums.unrealengine.com/t/squarish-flickering-on-translucent-and-reflective-materials/2127894/2 "2024-11-16T21:14:37Z")

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Never saw anything like that. I would try to reset all CVars and PPV settings. Likely one of them is causing this. Is this only on translucency? If yes, then maybe you have some z-fighting layers?

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**Author:** ![Erikwong](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Erikwong](https://forums.unrealengine.com/u/Erikwong)\
**Post date:** [November 27, 2024, 12:35pm UTC](https://forums.unrealengine.com/t/squarish-flickering-on-translucent-and-reflective-materials/2127894/3 "2024-11-27T12:35:58Z")

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> [@Krzysztof.N](#):
>
> reset all CVars and PPV

Hi Krzysztof, thanks for your reply. After I’ve changed to Unreal 5.4, most of the flickering is gone, but there are still some on reflective surfaces, like in chrome or mirror.