Lumen issue for particle refraction in UE 5.3

Development Rendering
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Hi everybody!
I have some issue with Niagara and particle reflection. If I use Unreal 5.1.1 the reflection works. But using Unreal 5.3.1 particles don’t reflect on the floor. This happens when I use sprite particles. Mesh particles works also in Unreal 5.3.1.
I also changed the settings following these instructions but nothing works: Lumen Global Illumination and Reflections in Unreal Engine | Unreal Engine 5.0 Documentation

The first picture is on Unreal 5.1 and the second is 5.3.

unreal5.1.PNG
unreal5.1.PNG554×640 60.1 KB

unreal5.3

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Translucency with lumen has been disabled due to a wide series of failure cases. Masked should work as expected, but translucency basically got cut from my knowledge.

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Thanks for the answer. Yes, I settled my particle sprites material blend mode to “mask” and it works. Do you see any downside to use this blend mode?

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None that I would be aware of, although I’m not very familiar with Niagara so I couldn’t tell you about potential behavior/bugs.

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I was having this problem too, and it was two particle light sources colliding. I turned the one source into a Single Sample Shadow and it stopped the conflict…done :slight_smile:

  1. Click on your particle effect, mine was a P_Torch_Fire, from the Dungeon Modular set available for free on Epic Games Store
  2. In the Details panel, search “shadow”
  3. Under Lighting, click on Single Sample Shadow from Stationary Lighting
    Should solve your problem

Cheers

DD

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Changing the material translucency pass to Before DOF fixes it also, if you don’t want to use opaque or masked blend modes.
24-07-11

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