Hey guys. I just wanted to know how to make portals like the ones that appear in portal one, which are already there, in the first few chambers when you don't have a portal gun. How to swich them with buttons might be helpful too, but I can probably figure that out by myself.

By the way, I've heard tell that those are area portals. I don't believe that, because it would be a lot of work.

Just place a prop_portal.

Did this really need a whole thread?

Probably not, sorry for the noob question!