Shadows are the obvious answer however i assume you are using lite and that s not an option.
Unity light goes through walls.
These options have obvious edge cases that can t be easily resolved.
Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling.
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That s why shadows exist.
Since you re using unity free put the plane on a specific layer.
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.
Now the light will not affect the object.
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.
Then click on your light click on the culling mask dropdown then uncheck the layer the object is on.
Published on nov 2 2017 you have a point light source behind some walls.
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.
That light should not affect that hallway at all anyways so it works perfectly.
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.