# Concerns Regarding the Phasing Out of Raytracing in Favor of Lumen in Future Unreal 5.4+

**URL:** <https://forums.unrealengine.com/t/concerns-regarding-the-phasing-out-of-raytracing-in-favor-of-lumen-in-future-unreal-5-4/1812324>\
**Category:** Feedback & Requests\
**Tags:** Reflections, Raytracing, unreal-engine, Lumen\
**Created:** [April 20, 2024, 9:44am UTC](https://forums.unrealengine.com/t/concerns-regarding-the-phasing-out-of-raytracing-in-favor-of-lumen-in-future-unreal-5-4/1812324 "2024-04-20T09:44:01Z")\
**Posts on this page:** 1\
**Showing post:** 23

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**Author:** ![RenyV](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@RenyV](https://forums.unrealengine.com/u/RenyV)\
**Post date:** [June 17, 2024, 8:57pm UTC](https://forums.unrealengine.com/t/concerns-regarding-the-phasing-out-of-raytracing-in-favor-of-lumen-in-future-unreal-5-4/1812324/23 "2024-06-17T20:57:51Z")

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As i commented in this post [PLEASE ! - Don't remove Raytracing Reflection (Deprecated) in 5.4 - #15 by RenyV](https://forums.unrealengine.com/t/please-dont-remove-raytracing-reflection-deprecated-in-5-4/1646182/15)  
the combination of these 2 variables makes reflections a lot better when roughness is 0  
r.Lumen.Reflections.DownsampleFactor 0  
r.Lumen.Reflections.Temporal 0  
but that it introduces a lot of noise if roughness isn’t 0. for those  
r.Lumen.Reflections.Temporal has to be set to 1 to look better  
so, it’s a trade off if you have different roughness in the scene. at least for realtime and interactive solutions.  
renders can be improved with more samples and a good post denoiser

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