I have a huge problem with lighting in my small project. I have a bathroom with 4 point lights and 2 directional lights one coming from heaven and one from hell. I solved about 90% of my problems but there is one more. I have a problem with strange shadow in corners. I understand that there could be shadow in corner but it’s not acceptable when one wall is covered in shadow and the second one is bright. I would be gratefull if someone could help me Point lights are placed in small gray circles visible of first image. The second image shows my problem.
my first thought is if these pieces of geo are just inter-penetrating this could also have a strange effect on the lighting. I would recommend using a 3d application like maya or 3d studio max to make your walls and make sure your verts are merged. or simply create a large square in unreal 4 additive, and then a smaller square subtractive, and create a room like that. I think you will find if your walls are not just going through each other the lighting will be fixed in that area.
This ones less likely I cant say for sure, but it could be that you have ambient occlusion on. Ambient occlusion is a fake shadow type, you probably know this, but the shadow is made from two objects being close to each other. In your case id guess because the walls are a 90 degree angle the corner would get that shadow.
From a design standpoint its to clean, needs its normal map and a bunch of grunge. maybe a tiny bit of reflection with some blur to it. and a spec layer. good luck