Strange Reflection in UE5


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Does anyone know what’s causing this strange reflection effect? It looks a bit blurry and dispersed. (I’m using Lumen)
Below is a real-life reference image I found.
I would really appreciate it if someone could help me resolve this. Thanks a lot!

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If you switch your renderer to reflections-only mode, what does it look like is casting the lighting?

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thanks for your help.

By the looks of it, your rock geometry is so far away that it’s not being encorporated into the lumen scene, so it can’t cast reflections. To get reflections that distance, you’ll need to use lumen’s far-field, which requires you having an HLOD. Have you built HLOD in your project?

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Yes, I’ve already built the HLOD, and I also replaced the rock model, making sure that it correctly generates reflections. However, the issue still persisted. In the end, I adjusted the material’s roughness to 0, and that seemed to fix it!
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But since I’m not too familiar with rendering, In your opinion, was it the right move to set the roughness to 0 in this situation?