How to fix indirect lights seeping through walls.

Unity point light goes through walls. How much light is reflected depends on the wall. If the wall was made of glass then obviously the light would pass through it. A white painted wall will reflect more of the light than a black painted one. Open window lighting scene and turn the ambient intensity to 0 and reflection intensity to 0 to get rid of the default ambient lighting.

These options have obvious edge cases that can t be easily resolved. In blender there is an option called edge split which makes edges sharp. However the dominant interaction with the wall is probably scattering. Visible light does not pass through most walls.

Place it just behind your wall so that it blocks the light from leaking out. Lights are very easy to use in unity you simply need to create a light of the desired type eg from the menu gameobject light point light and place it where you want it in the scene if you enable scene view lighting the sun button on the toolbar then you can see a preview of how the lighting will look as you move light objects and set their parameters. You can simulate this in shaders or use raycasts to see if the light is behind a wall. Applying that before importing your model means that the faces along that edge are not actually connected and a tiny bit of light will fall through as a result.

On why there is still a slight light in your scene despite the walls that s unity s environment lighting. It s really just a shadow type setting that needs to be set right. Create a unity primitive cube plane etc sized similarly to your wall remove its collider and in the mesh renderer properties set it to shadows only. Here is how to fix it.

You have a point light source behind some walls. Light is also reflected by a wall otherwise you wouldn t be able to see it.

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