Foleyman, I am a noob just starting to map for l4d2, and I thought your mapping tutorials were fantastic. I have started a basic level and was trying to figure out how to make a rolling door. I can't figure out how to make it roll upwards or to the side instead of just rotating like a regular door.
If you could help with this that would be fantastic
Thanks
Forlorn

Try creating a brush that you are going to use for your door. Next tie it to an entity (crtl + t), make it a func_door.

Open its properties and under move direction you should see a drop down menu next to a black circle. Either select "up" or use the line inside the black circle to select your direction. That should give you an upwards opening door.