Okay, well I didn't use the search feature before posting this question because I wasn't really sure waht to search for. I want to create a small building on my map but I don't want to have to script a door. I want it to be just an opening. I made a full cube (rectangular prism) and then created a selection and placed it inside the wall, and tried to use a texture such as blank to see if that would make it see-through. None of this actually worked >.> So I was just wondering what I should do.

yo im a newb aswel so soz if this is wrong, but are u saying u made a square room and to make the door u tried to make another brush and placed it where the door will be and tried to make it see through.

i think ur meant to make the door by making a wall with a hole in it if you know what i mean.

Yes, that is what I meant. I have figured this out as well, this topic may be locked or something >.>

Argh, sorry. I have to open this again. This time I'm making a building, like a tower or something maybe an apartment. I need to know how i make a window. Not like a brush or anything, I mean just like... a hole basically. I tried clipping, and I can't seem to make even the doors (just holes/hollowings) without taking out half of the building.

There is a tutorial in the CoD2 tutorial section about making doors and windows. It works in CoD as wel.

is just making the window by having a brush underneath a brush ontop and a brush either side jus as good for windows tho? basically i mean u dont have to use the clipper rite?

correct.. you don't HAVE to use the clipper tool to make a window.. but.. it is much quicker usually.. and.. you'll be needing the clipper tool for other things as wel, like roofs etc. so it's a good thing to familiarise yourself with the use of the clipper tool