How to fix "light cracks" in geometry?

Hello, I’m a beginner to using UE4, and I’m having some issues regarding light passing into my buildings through the edges of my geometry. I was adding textures to my geometry surfaces when I started to notice this happening:

You’ll notice on the edges of the stairs that light is peeking through. I tried moving the stairs into the wall and the wall into the stairs, but I’m still getting the same issue. You can even see objects outside if you zoom in close enough to the “cracks”. This is also occurring in several other areas of the interior of my building.

I’m unsure how to solve this. Does anyone have a solution for me?

You’ll get this problem ( mostly ) with single sided geometry. Walls and stairs need thickness, just like in real life :slight_smile:

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Hi!

Maybe your material is reflective and you’ve placed your reflection captures not ideally: you get false reflection from the outside and that looks like “light”…

Okay, I think I see what you’re getting at. Thanks