# Exponential height fog rendering issue in 4.11

**URL:** <https://forums.unrealengine.com/t/exponential-height-fog-rendering-issue-in-4-11/343169>\
**Category:** Rendering\
**Tags:** Fog, unreal-engine, Rendering, question\
**Created:** [January 5, 2016, 11:20am UTC](https://forums.unrealengine.com/t/exponential-height-fog-rendering-issue-in-4-11/343169 "2016-01-05T11:20:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![zeOrb](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@zeOrb](https://forums.unrealengine.com/u/zeOrb)\
**Post date:** [January 5, 2016, 11:20am UTC](https://forums.unrealengine.com/t/exponential-height-fog-rendering-issue-in-4-11/343169/1 "2016-01-05T11:20:40Z")

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I’m getting weird flickering issue whenever I add exponential height fog to the scene. I’ve read about issues with having atmospheric AND height fog, but my issue is not related to this.

**What is happening:**

- Whole screen is flickering with black color every 10-20ms
- Flickering remains in Lit and Unlit mode, every other mode is safe
- Manual creation of fog in Blendable using SceneDepth channel is working okay, so not related to this.

**How to reproduce:**

Create a basic scene, delete atmospheric fog, delete atmospheric fog and then add exponential height fog.

**My PC:**

- Intel Core i7-4770K

- NVIDIA GeForce GTX 760

- OS version: Windows 10 Build 10586

- Driver Version: 361.43

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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:** [January 5, 2016, 2:41pm UTC](https://forums.unrealengine.com/t/exponential-height-fog-rendering-issue-in-4-11/343169/2 "2016-01-05T14:41:55Z")

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Hi zeOrb,

This has already been reported and is being tracked with UE-24810.

Thanks for taking the time to post!

Tim

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**Author:** ![anonymous\_user\_d84f67e9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_d84f67e9](https://forums.unrealengine.com/u/anonymous_user_d84f67e9)\
**Post date:** [June 4, 2017, 8:35pm UTC](https://forums.unrealengine.com/t/exponential-height-fog-rendering-issue-in-4-11/343169/3 "2017-06-04T20:35:42Z")

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Hello, was this issue ever resolved? I’m encountering the same issue with version the current version 4.17… it seems that distance, height, density settings don’t affect the issue. I am using sequencer to output a landscape video, when the camera pans through a larger vista we get flickering that is really intense in the darker areas at a distance ( black and white, lunar type looking video ). Any custom settings to consider ? Thanks.