Virtual Textures rendering as solid colors

Hi!

When using virtual textures, which I have to do at this point because the scene is getting way too detailed, the textures break in this very weird way.

r/unrealengine - Virtual textures not working

These are, as you can probably see, Quixel megascan assets, but the textures don’t load properly. Even on the one I have selected here one of the textures, the normal map is broken.

On the smooth rock here’s what it looks like in the content browser:

r/unrealengine - Virtual textures not working

All of the textures look right, but the material is just a muddy mess.

When I open the textures it becomes clear though:

r/unrealengine - Virtual textures not working

This is what happens, Unreal treats it as a single color and we’ve got no idea why it does this or how to fix it. I’ve tried searching but I haven’t been able to find anything.

This is on a 4090 with a i9-13900KS with 128 GB RAM.

Bump!

Can anyone please help? It’s a really weird issue and I’ve got no idea what to do next.

Not sure, but my immediate hunch is that it might have something to do with mipmaps. The lowest quality mipmap is typically just a single pixel that is essentially an average of the full image.

Hm, could be. That’s certainly the result I’m getting.

How would I go about changing the quality of the mipmaps?