# HDRI backdrop reflect lower black hemisphere in UE5.5

**URL:** <https://forums.unrealengine.com/t/hdri-backdrop-reflect-lower-black-hemisphere-in-ue5-5/2133117>\
**Category:** Rendering\
**Tags:** unreal-engine, Rendering, question\
**Created:** [November 18, 2024, 4:00pm UTC](https://forums.unrealengine.com/t/hdri-backdrop-reflect-lower-black-hemisphere-in-ue5-5/2133117 "2024-11-18T16:00:13Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![RobertSmith3d](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@RobertSmith3d](https://forums.unrealengine.com/u/RobertSmith3d)\
**Post date:** [January 23, 2025, 3:22am UTC](https://forums.unrealengine.com/t/hdri-backdrop-reflect-lower-black-hemisphere-in-ue5-5/2133117/3 "2025-01-23T03:22:42Z")

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Hi,

I’m having a similar issue with the HDRBackdrop in 5.5.1. I do have Lumen and Hit lighting for reflections enabled, as well as Screen Traces option on.  
It’s been quite inconsistent within the same projects - it usually works in the beginning, but it stops working randomly later on. I can’t say that I’m doing something specific that makes it break, but it does.

Once thing I’ve done today is to change the mesh type from Dome to EnviroBox soft - the reflections came back when I did this, but then they went away when I re-opened the same project.

If anyone has any insight into this, it would be appreciated, as the randomness of it makes it hard to figure out what’s going on.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/6/7/d679eefa4f84e66547038c51c1130f83127c10d7.png)

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/5/f/15fb783b6eac45ef4892102f9286865f66226ba2.jpeg)

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