First thing i notice from deleting just the normal map, making diffuse white, removing metal, roughness and displacement… is the lighting gets stupid … I even get ao in lit areas…
This is before i can actually test anything in a brand new scene.
For your info its the tiling white sides of the buildings… thats all it is is white. Just an ao applied.
Why would removing the normal map make it look like crap? Its not like its a baked model from high to low… its modular wall peices that are flat
