UE5 Lumen GI Scale Bug?

Development Rendering
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1

I am working on a kitchen scene for cinematic use.
I am trying to use the full capacity of Lumen but I am having a hard time troubleshooting this error with Lighting
Description:
Several Meshes have no Lumen Scene representation thus not contributing to GI when off screen. This is also creating a lot of flickering in reflection on the final render.

LumenScene
LumenScene1622×1075 71.6 KB

“Lumen Scene1” is a cube with a red material and a light reflecting light on it. As you can see it is black on the Lumen Scene and when it is off screen there is no red bounce Lighting.

“Lumen Scene 2” is the same cube with a bigger scale. It is working properly as you can see there is bounce lighting when off screen.

There are several meshes in my scene with similar sizes. Some are contributing to GI and some aren’t. I can’t go scaling everything up.

What is causing this lack of Lumen Scene representation and What might I do to fix it?

1 Like
2

Can I bump this?
It’s still happening. Think it is just a bug that will be ironed out on the official release?

3

Hi, old thread, but I just started learning Lumen - and I remember one tutorial by Mathew Wadstein mentioning, that Distance Field Resolution is based on the imported scale of a mesh, so importing small meshes and scaling up in scene might cause troubles.
Found the tutorial here - around 4:20 on setting distance field resolution.
I hope, this is helpful to you.

4

Hey, thanks for helping!
Since posting I have found it to be that way and have been doing this with varying results.
Surface cache seems to roughly work the same way.