Window'n'wall

[TexasSixShooter]

I am makin' a map where you defendin' a Pavlov's house, that have a lots of window's. Is there anyway to make a hole in wall without makin' a billion of block's?

 

[spruce]

Unfortunately no, unless you make a model which at that point is (in my opinion) far more complicated and if you want to have a modicum of optimization you'd have to place brushes either way

Here's a few window/hole examples with low brush counts:

 

[TexasSixShooter]

Its sad, but, anyway, thanks!