# Lumen GI and Reflections feedback thread

**URL:** <https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108>\
**Category:** Rendering\
**Tags:** Staff-Pick-UE, unreal-engine, Lumen\
**Created:** [February 22, 2022, 9:01pm UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108 "2022-02-22T21:01:05Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![Lex4art](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/lex4art/32/1179098_2.png) [@Lex4art](https://forums.unrealengine.com/u/Lex4art)\
**Post date:** [February 24, 2022, 10:20am UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108/20 "2022-02-24T10:20:50Z")

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Hi everyone. I did some tests with Preview 1 and with many neat improvements I’ve run into a problem with my metal materials package. How did they look on UE4:

 ![HighresScreenshot00003](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/6/5/3651781ab9fc876b4cd5d0ef1496e0f613d5ebf1.jpeg)  
 ![HighresScreenshot00001](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/2/3/d23c0a7701f24fe965c75a56962aa18391dc48ae.jpeg)  
 ![HighresScreenshot00002](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/2/5/0257d59bbbe3ef679d7904af4098cd0b316144e8.jpeg)

And how they looks in UE5 Preview 1:

 ![HighresScreenshot00002](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/8/7/387591c70e3a4da33fa74235a71f840d7f3f65eb.jpeg)  
 ![HighresScreenshot00000](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/5/7/95757687dab922353504e4014fc7fe1cd4714614.jpeg)  
 ![HighresScreenshot00001](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/3/4/734d9a4c882fa7a2f86e33c31baad0e00c4da431.jpeg)

Anything that was not fully matte now appears so blurry…

Switching back to Screen Space Reflections in UE5 Preview 1 works brings sharpness back but at some roughness values material becomes black for some reason:

 ![Roughness issues in UE5 preview 1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/a/d/4adf70349a37381769fe67ac11feb7d586ddc8c6.jpeg)  
So I have tons of black artifacts from my roughness maps in random places.

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