That s why shadows exist.
Unity light goes through walls.
The real solution would be to create walls with actual depth so it gives the shadow bias some room to work.
The layers are the dropdown box in the upper right of the inspector.
Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling.
Otherwise lights will go right through the backfaces by default.
In that case you ll need to be a bit more clever.
Light going through wall unity answers unity is the ultimate game development platform.
My level has high walls all around it and what i want is for the 1st person controller to just bump into the walls without going through it i created the level before i heard you need to tick the generate colliders so i ticked that doesnt affect the level thats out it will make colliders but i will have to start it all over again.
Published on nov 2 2017 you have a point light source behind some walls.
Shadows are the obvious answer however i assume you are using lite and that s not an option.
You can simulate this in shaders or use raycasts to see if the light is behind a wall.
For his situation and scene what worked best we thought was to simply set a floor2 layer on the other side of the wall and disable that layer for that light.
Unity 5 also made a big change in how it s shadows are rendered be sure to select your object and set cast shadows via the inspector top of mesh renderer component to two sided.
These options have obvious edge cases that can t be easily resolved.
Since you re using unity free put the plane on a specific layer.
Now the light will not affect the object.