# Height Fog invisible in Ray Traced Reflections.

**URL:** <https://forums.unrealengine.com/t/height-fog-invisible-in-ray-traced-reflections/1895517>\
**Category:** Rendering\
**Tags:** Fog, unreal-engine, Ray-Tracing, Lumen, Rendering, question\
**Created:** [June 8, 2024, 7:07pm UTC](https://forums.unrealengine.com/t/height-fog-invisible-in-ray-traced-reflections/1895517 "2024-06-08T19:07:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Online\_Learner\_KPoqc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Online\_Learner\_KPoqc](https://forums.unrealengine.com/u/Online_Learner_KPoqc)\
**Post date:** [June 8, 2024, 7:07pm UTC](https://forums.unrealengine.com/t/height-fog-invisible-in-ray-traced-reflections/1895517/1 "2024-06-08T19:07:50Z")

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I’m using Raytracing with a simple glass material. For some reason, the fog doesn’t show up in the glass reflection. I tried using \<r.RayTracing.Reflections.HeightFog 1\> but it doesn’t affect the scene.

Can someone please help me out? Thanks!

 ![fog](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/1/e/81ec24ff841d647b0de86256163b8c1cb7bc4d60.jpeg)

Post Process Volume Settings:

![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/e/7/9e717ba2ca5d31f8185f5f710b7afb26fc0fee13.png)

![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/b/8/fb8dc3f1facc9b4d97a55de4f60a577b0825933b.png)

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<div class="post-metadata">

**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:** [June 8, 2024, 8:35pm UTC](https://forums.unrealengine.com/t/height-fog-invisible-in-ray-traced-reflections/1895517/2 "2024-06-08T20:35:05Z")

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You have selected Lumen as your ray tracing method, so Standalone Ray Traced Reflection settings won’t affect anything.

Use `r.Lumen.SampleFog 1` if you want to enable height fog in Lumen (ray traced) Reflections.

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<div class="post-metadata">

**Author:** ![Online\_Learner\_KPoqc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Online\_Learner\_KPoqc](https://forums.unrealengine.com/u/Online_Learner_KPoqc)\
**Post date:** [June 9, 2024, 3:44am UTC](https://forums.unrealengine.com/t/height-fog-invisible-in-ray-traced-reflections/1895517/3 "2024-06-09T03:44:39Z")

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Thanks for your response, for some reason this doesn’t seem to work in my case. I could not observe any visible changes after executing it.

This is how it looks in Path Tracing mode.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/3/4/f340e5ae85b1a759379d1272267c7d7bd1da9718.jpeg)

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<div class="post-metadata">

**Author:** ![EnDrX](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/endrx/32/538237_2.png) [@EnDrX](https://forums.unrealengine.com/u/EnDrX)\
**Post date:** [August 9, 2025, 9:49pm UTC](https://forums.unrealengine.com/t/height-fog-invisible-in-ray-traced-reflections/1895517/4 "2025-08-09T21:49:11Z")

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Have you found a solution?