http://www.youtube.com/watch?v=t7jjkwSy8kc

its pretty obvious what i did if your a good mapper all i did was take one portal and put it on the wall and the other on the ceiling of the same corridor copied over and flipped 90 degrees

ill put up a download to the vmf and the bsp later

msleeper wrote:
That's pretty neat. Could you do it in the same room you're in, IE have a switch instead of a button, and the switch would change the "direction" of the gravity?

maybe ill try it out but it will be pretty hard considering it uses the linked_portal_doors and you have to go through it to change the gravity and the gravity change is only an illusion will be hard to do something like that atleast it would be hard to make it look nice

msleeper wrote:
That's pretty neat. Could you do it in the same room you're in, IE have a switch instead of a button, and the switch would change the "direction" of the gravity?

Because Portal 2 uses mostly dynamic lighting, it wouldn't be out of the question to flip the entire map. As an added bonus, the player will be able to feel the room turning upside down.

Edit: uj2p6FP4oV4

Maybe if you had a trigger just past the "red hallway" entrance that disabled the world portal after you jumped through it, so when you look back into the original room it is now inverted. You then throw a portal into the flipped room and feel like you have changed gravity.

Of course, if you still had an active portal in the first room, you could still achieve a fling in that room as well.

Get what I'm getting at here? If not, I'll see if I can make an example of it. Although, I haven't experimented with world portals yet.

OK, going to spell this out better. (I was confusing myself when I re-read it).

Room 1: normal gravity
Room 2: sideways gravity

Press the button in Room 1, which opens a world portal into the hallway of Room 2. Jump through the portal into Room 2 where then you hit a trigger which disables the world portal. You are now completely in Room 2 and can look back into the main room and shoot a portal to get access to the sideways gravity.

Use similar hallways easily accessible from each gravity direction to get back to different rooms... you know what, fuck it, even though its late this idea has intrigued me and I'm gonna try to make it.

Edit: Nvm I got someones map and figured it out. I'm currently trying to tackle the task of making the portal and connected wall appear/disappear at the right times with the button/trigger. Right now I'm just using brushes and doing enable/disable on them... hope it works.

Edit2: Ok, the whole brush thing didnt work. I got the brush to appear with the button, but the portal was not activate on top of it to get into the next room.

I may have to abandon the whole "falling hallway" from the OP's video for a more simplified wall portal that just leads straight into the next room. Not as nice, and you wont see yourself in the room (obviously), but it could work as intended. Maybe when integrated with an actual puzzle you could pull it off without breaking immersion.

Edit3: OK, now I just look like an idiot. I figured how the portals ACTUALLY work... so yeah this should work just fine.

and here's a "opened up" version to give you an idea of what he did...
http://www.youtube.com/watch?v=4XLaFGPlpT4

not sure if this will relate to what you're trying to do...