# Flickering Volumetric Fog

**URL:** <https://forums.unrealengine.com/t/flickering-volumetric-fog/474734>\
**Category:** Rendering\
**Tags:** unreal-engine, flickering, volumetric-fog, question\
**Created:** [November 19, 2020, 5:54pm UTC](https://forums.unrealengine.com/t/flickering-volumetric-fog/474734 "2020-11-19T17:54:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![eco\_bach2](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@eco\_bach2](https://forums.unrealengine.com/u/eco_bach2)\
**Post date:** [November 19, 2020, 5:54pm UTC](https://forums.unrealengine.com/t/flickering-volumetric-fog/474734/1 "2020-11-19T17:54:34Z")

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Searched but not really a solid answer.

I am using Volumetric Fog in a Exponential height Fog Component.

If I set Viewport Type to Cinematic Viewport and view thru a placed camera, the result is flickering volumetric fog in the distance.  
I can disable it by simply unchecking Volumetric Fog in my Exponential Height Fog or viewing thru the Default Viewport.

Is there a command console setting perhaps I can try?

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**Author:** ![eco\_bach2](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@eco\_bach2](https://forums.unrealengine.com/u/eco_bach2)\
**Post date:** [November 29, 2020, 1:33am UTC](https://forums.unrealengine.com/t/flickering-volumetric-fog/474734/2 "2020-11-29T01:33:58Z")

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The solution seems to be indirectly related to Ray Tracing as if I disable DX12 it seems to go away.

At least this setting was removed in my DefaultEngine.ini settings  
DefaultGraphicsRHI=DefaultGraphicsRHI\_DX12

Also the issue is not simply Volumetric Fog by itself bu the interaction of Spotlights and Volumetric Fog.

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**Author:** ![nikolaiMurzin](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@nikolaiMurzin](https://forums.unrealengine.com/u/nikolaiMurzin)\
**Post date:** [June 28, 2023, 4:11pm UTC](https://forums.unrealengine.com/t/flickering-volumetric-fog/474734/3 "2023-06-28T16:11:49Z")

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Hey! I fixed it by increase r.ScreenPercentage to 200 in console variables in Movie Render Queue settings, it’s for rendering of course. For viewport I don’t know how to fix it

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**Author:** ![XavierAlbertStudio](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/xavieralbertstudio/32/1153633_2.png) [@XavierAlbertStudio](https://forums.unrealengine.com/u/XavierAlbertStudio)\
**Post date:** [October 5, 2024, 2:11pm UTC](https://forums.unrealengine.com/t/flickering-volumetric-fog/474734/4 "2024-10-05T14:11:36Z")

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The command “r.VolumetricFog.GridSizeZ 1024” can give you thinner rendering of volumetrics. Use with precaution. Crank up to get better looking fog.