Light is going through object I don't want it to

[wes_youtuber (AhWes)]

There is this light penetrating through what I intended to be the light barrier. I am confused because its transparency is 0. Can someone please help me?

[crazyferret1231 (caulk)]

If you have room, try and make the walls thicker, and overlapping on the outside so there is no chance of the sunlight bleeding through.

[wes_youtuber (AhWes)]

Dude, I’m trying to make these walls very thick, but it isn’t working

[crazyferret1231 (caulk)]

What is your lighting mode set to? Maybe play around with those if your game isn’t reliant on them.

[syq0a]

When I have this problem, I usually follow 3 main solutions. Make the walls thicker, change the lighting mode or make sure I haven’t switched off CastShadow for anything. Most of the time though, it is the lighting mode.