so i've made a nice little room. i have well designed windows but i don't know how to make them actual windows. i set the surface flags to "sky", but i want it to act like a window when i shoot it, not just dissapear. basically, i want the illusion of glass when i shoot at a sky surface. can someone help?

![http://i371.photobucket.com/albums/oo151/andrew61987/window.jpg [http://i371.photobucket.com/albums/oo151/andrew61987/window.jpg]](http://i371.photobucket.com/albums/oo151/andrew61987/window.jpg)
