# Atmospheric Fog graphic glith \[4.12\]

**URL:** <https://forums.unrealengine.com/t/atmospheric-fog-graphic-glith-4-12/360782>\
**Category:** Rendering\
**Tags:** error, Fog, UE4-12, unreal-engine, question\
**Created:** [June 14, 2016, 6:50pm UTC](https://forums.unrealengine.com/t/atmospheric-fog-graphic-glith-4-12/360782 "2016-06-14T18:50:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![luki9914](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@luki9914](https://forums.unrealengine.com/u/luki9914)\
**Post date:** [June 14, 2016, 6:50pm UTC](https://forums.unrealengine.com/t/atmospheric-fog-graphic-glith-4-12/360782/1 "2016-06-14T18:50:20Z")

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Hi i have wired glithes on atmospheric fog in this wersion UE, you know how to fix this?

 ![94634-highresscreenshot00000.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/e/d/9ed0a47f61a3c0af1cf23221d8c862eed8205c9e.png)

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**Author:** ![anonymous\_user\_0df12f74](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_0df12f74](https://forums.unrealengine.com/u/anonymous_user_0df12f74)\
**Post date:** [June 16, 2016, 4:18pm UTC](https://forums.unrealengine.com/t/atmospheric-fog-graphic-glith-4-12/360782/2 "2016-06-16T16:18:59Z")

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Hey there,

I noticed the same issue the other day. While this is not a permanent fix (I still get some black pixels randomly) it does help.

In the details panel change the “Ground Offset” value to either 0 or the z-axis height of your landscape. I am not sure why it is set to -100000 by default, might be a bug, but adjusting it should help.

I’ve moved this thread over to Bug Reports so Epic is aware of the issue. Reproducing this is as simple as opening a new project with a blank level and adding an AtmosphericFog actor to the world. Changing the GroundOffset does help while the camera is near the surface, but there is still some issues when rotating or moving the camera up/down.

Thanks

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [June 16, 2016, 8:44pm UTC](https://forums.unrealengine.com/t/atmospheric-fog-graphic-glith-4-12/360782/3 "2016-06-16T20:44:49Z")

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Hi Luki,

This has already been reported with UE-30844.

If your comfortable editing .usf files this can be done locally on your machine in a Binary or Source build. It doesn’t require a recompile of the engine only the shaders will recompile when you re-open the project.

This post contains the information you need to make the adjustments.

> **[Atmospheric fog colour material expression broken](https://forums.unrealengine.com/questions/429830/atmospheric-fog-colour-material-expression-broken.html)**
>
> The atmospheric fog colour material expression is broken in 4.12. I’m using it to light my scene so it looks extremely messed up right now. This is an example of how I use it in a material: https://i.imgur.com/JrPmc60.png In 4.11:...

Thank you!