Seams in walls

[hero622]

I noticed that there are these small seams in seemingly all connecting walls. They become very clear once placing a directional light.

(Picture from Portal 2's sp_a1_intro2)
In this picture I made the light red so you can clearly see it shining through the seams. I'm not sure how to do this, but the faces could be extended by some small value. (Note: I know you can play around with the bias of the light and etc, but even setting it to the smallest value doesn't really fix it, and it would be way nicer if it could be fixed without messing around with those.)

[DeadZoneLuna]

Ahh, yes.. a common engine problem..
Unity doesn't allow offsetting shadows with save direction. (Only in shaders possible.. but its difficult to control that for each light)

At the moment there are no working solution to fix this.. But I'll try to come up with something with it later or if you have any ideas, feel free to suggest :^)