Light Leaking walls

Hi guys :slight_smile:

i modeled a scene in Cinema 4D then imported it to UE 4.19 into a blank scene (the default one), I havent touchet to the light or anything. I just clicked on Build to build the lights.

Once inside the ‘‘room’’ there is a lot of light leaking… Known that i have intersected all the walls ceiling and floor to ‘‘seal’’ the room from light leaking :confused:

I want to have a 100% dark room to get the light come from a window :rolleyes:

Any idea?