Alright, I have read through this thread, and still cannot wrap my noob head around hint brushes. I understand kind of what you are saying above, my problem is, in my map, the main room visleaf can see into the outside visleafs, ah i dont know how to explain. take a look at my mat_wireframe 1
http://www.nuk3m.net/murderball/mdberror.jpg
it is not only drawing the side room, but also the yard.