Dark scene gets illuminated when looking through Fire particles

Development Rendering
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1

Hi everyone, I am working on a horror game where lighting is a major feature. I have this issue with the scene in UE5 and honestly don’t know what is happening. My scene is completely dark and I have fire elements in the scene with small attenuation radius just for the atmosphere. However, when I look through the fire, the objects behind that are supposed to be in complete in the darkness suddenly light up and are clearly visible. Effect happens both with Niagara system and Particle systems:

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Completely dark scene with fire element (particle system) in the front

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Objects in background get illuminated if I move to the left.

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Here is looking around with candle (Niagara). Scene is dark.

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Just moving camera a little and now whole back wall is illuminated.

Unreal version 5.0.3
Unbound post-process volume with Min/Max exposure =1.0

I’d appreciate any help on this!

2

Does the material for your fire particles include something where it is removing the Eye Adaption?
Something like this?

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That would cause your fire to never adjust with the eye adaption and everything else to adjust.

3

No, checked both, didn’t see anything close to that. The first fire material I am using is the P_Fire from the starter pack btw.

4

HI there! Maybe the lighting in the room shouldn’t be coming from the particle materials, but from a point light. That will give you more control. You can even make the light blink, change colours etc.

5

hi, no luck. the candle doesn’t have a light source attached, only emissive color available and it still gives me this weird effect.

6

It’s lumen (i guess it’s a screen traces bug). Noticed same effect, when tested lumen performance.

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7

apparently it is lumen. as soon as I went ahead and disabled Lumen it all went away. but now the scene looks kinda dull. Lumen was giving it a kick it seems, but it REALLY needs to be fixed.

8

Hello! This issue still occurs in UE5.1 and is quite disruptive for my project, because it affects the particle effect on the player’s torch they carry around. You can see the glow affecting all objects behind it.
Does anyone know if there’s a fix with the latest version (project setting?) or is there anyway we can raise this issue to the Epic team so they have it on their radar as a bug to fix?
EDIT: Is there a way to ‘unresolve’ this thread ? If not, I’ll make a new thread :slight_smile:

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