Build Lighting Shading Problem

Hi, I’m working on a modular level design system and I ran into a problem with lighting. When I build the lighting all faces are shaded different.

I have an empty scene and added a 1x1m plane wich I duplicated several times to create a room. Also I added a directional light set on static. The material has only a texture sample as base color and the model is created in blender were I unwrapped it for texturing. It has 2 UV channels in UE4.

I tried this in different new projects, in different versions of UE4 and with other simple objects like this plane. What could be the problem here?

The problem might be your second UV channel. Unreal uses this channel to make light calculations and draw the result on the texture, if this set of UVs has any problem then there will be problems with this type of lighting. Just so we can discard this issue could you show a screenshot of your second set of UVs?

Your answer should be in this thread.

Thank you for your quick answer!

I already had the same assumption but the two uv channels seam to be okay… The first one looks like the one in blender filling the whole square. The second one wich is created by Unreal has a small margin to the border of the square but I don’t think that this is important…

uv channel 0

uv channel 1