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I would like my background made of the same tiles as my foreground but with a filter which makes it appear further away from the camera.
Making the objects smaller is easy, I just have to decrease the scale of the tilemap.
But I also want it to have a "fog effect". So for example if the sky is blue then the tiles will be as blueish as far they are from the camera.
How could I implement this?
Example for fog effect:
If you are only interested in 2D fog, you can simply change the color of the background sprites so it looks like it is behind a fog. In Unity, you can simply change the color of the Image component, or the color of the material (depending how you are drawing them).
For example, try adding a dark grey color to it.
This has the disadvantage that you can't apply light-colors, as white means use the Texture's original color. Instead, you can make a trick shader-wise, if you feel comfortable with that, simply making pixels of an object whiter than they should, the further away they are from the camera.
1f so the texture keeps its original colors. I'm not sure if it's possible to do addition, which would support white as well, that's why I suggested a custom shader, so the user can have total control
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