Preveiw Screens all black in UE5

[Gunslinger86]

I dont know why but all my previews are black, latest version of UE5

actual meshes and preview scene are way brighter:

[Owlree]

They’re not black, but the meshes are shaded with a dark colour. It looks like the new dark checkered backgrounds in the thumbnails don’t really work in this case (both the background and the mesh are dark, so ).

I am not aware of any ways to change the thumbnail preview scene settings UE5 without going into C++ but somebody please correct me if I’m wrong. I tried playing with the theme settings to to no avail.

If you’re willing to look in the engine code to your backgrounds, Engine\Source\Editor\UnrealEd\Public\ThumbnailHelpers.h:125 should be a good place to start.

[Online_Learner_5XZaf (mengyeli)]

I have the same question in UE5.1.1. After reading the code about rendering thumbnails, I found the reason: I had added a new flag in showflag.cpp, which ultimately changed the lighting. In this case, I disabled the flag in this function, and now it works well. Maybe this can help someone.

// for rendering thumbnails, cascade, material editor, static mesh editor
// keeps bloom as material properties with HDR can be better perceived
void DisableAdvancedFeatures()