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I'm having an issue with shadows on imported meshes that touch. There's really ugly shadow artifacts in between the meshes. I tried fixing with the world and light settings in my level, including upping the build quality, but nothing worked. Here's a screenshot showing my issue: 

Is there any settings in HammUEr that I can change to fix this?

Try to use a nodraw material for faces that can't be seen, and grouping the walls together.

All the walls on the map or just sections of the walls?

Join the sections that have weird shadows where they intersect, basically