HLOD generates black/invalid textures

Development Rendering
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1

Hi,

when generating HLODs with “approximated mesh” setting some meshes are rendered wrong to the textures. They appear black with invalid normals.

In this case there is a simple blueprint with some meshes (all the same)

[Image Removed]

The generated mesh looks like this:

[Image Removed]

I’ve testet it with UE 5.4.4 and UE 5.5.4.

The reproduction project is attached.

Is there any known workaround for this issue? Most of our world is generated quite good but some meshes are black.

Thanks

2

Steps to Reproduce
Open the project

Unload world partition region

Show HLODs

You can see the invalid/black parts of the generated HLOD

Rebuilding the HLOD doesn’t fix it.

3

Hello,

We’re currently unsure what the issue might be and will need some additional time to take a look.

Thanks,

Ryan

4

Hi Mathias!

We finally figured out what the issue was… During the texture capture, it was possible for components to be distanced culled…

You can find the fix here (which will be in UE 5.7)

https://github.com/EpicGames/UnrealEngine/commit/4e950494336877093e559ab7f9cb9a6efc78d303

Regards

Sebastien