# Volumetric Fog in lights getting odd artifacts

**URL:** <https://forums.unrealengine.com/t/volumetric-fog-in-lights-getting-odd-artifacts/2282267>\
**Category:** Rendering\
**Tags:** light, unreal-engine, volumetric-fog, question\
**Created:** [January 17, 2025, 10:03am UTC](https://forums.unrealengine.com/t/volumetric-fog-in-lights-getting-odd-artifacts/2282267 "2025-01-17T10:03:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lindkvast](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/lindkvast/32/1016248_2.png) [@lindkvast](https://forums.unrealengine.com/u/lindkvast)\
**Post date:** [January 17, 2025, 10:03am UTC](https://forums.unrealengine.com/t/volumetric-fog-in-lights-getting-odd-artifacts/2282267/1 "2025-01-17T10:03:16Z")

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Hello!

I get odd artifacts in my volumetric fog coming out of my spotlights. They are inside a blueprint. There are “spots” where the volume isn’t visible. See screenshot (never mind the different colors of the lights):

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/a/7/3a71c2bc3cfdb26052dd61852eba2fdbb7deef0e.jpeg)

I’ve tried increasing the grid pixel size and other console commands, nothing has changed what’s happening so far. Removing all lighting-related actors (height fog, lights, atmo, pp volume etc) and rebuilding them from scratch does not remove the problem. Any suggestions appreciated if you’ve seen this error before! I haven’t.

EDIT: These “splotch” artifacts also appear further out in the light fog, not just at the “start”. Almost like there was a soft noise being applied at world scale or something.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/b/a/8ba68284d13d938b7dadaa2d1a6727368f92371e.jpeg)

This is in UE 5.5.1.

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<div class="post-metadata">

**Author:** ![lindkvast](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/lindkvast/32/1016248_2.png) [@lindkvast](https://forums.unrealengine.com/u/lindkvast)\
**Post date:** [January 17, 2025, 3:10pm UTC](https://forums.unrealengine.com/t/volumetric-fog-in-lights-getting-odd-artifacts/2282267/2 "2025-01-17T15:10:47Z")

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Not what I wished for, but downgrading to DirectX 11 fixed it for now.