So i had my small project for studies and after playing around with lights this happend. I can’t get things right after whatever made this happen. Shadows got all buggy and i have no clue what to do. Please help!
Thing is most of bugged shadows are on bsp brushes.
Its one of starter content materials.
It’s a normal problem, try to change normals of your mesh a bit, and they will look good. if you are working in 3dsMax try some Auto Smooth in Polygon Smothing group in Editable poly stuff. select the black surface and click Auto Smoth. I have the same problem in UDK and I managed to fix it.
Could changing anything in global post process change things? Or maybe lights casting both dynamic and static shadows.
I already said that problems are with BSP brushes, meshes that are imported from 3ds are fine. Is is possible to change normals of BSP brush? I’m new to UE so i’m still learning a lot.
I don’t think that would be possible to change a bsp normal , check the size of light map that you specify to this brush. and if the problem didn’t solved yet, don’t wast your time with BSP and use a plane mesh instead. 
There is nothing(other meshes) that would product such shadows on this meshes.
3ds models are glass and window frames.
Hi LinQ,
I can take a look for you and give some feedback if you’d like to share any asset that is giving you shadowing issues. You can post here or send to me a private message on the forums (https://forums.unrealengine.com/private.php?do=newpm&u=4894) and I can have a look.
Let me know.