Quote from spongylover123 on February 17, 2012, 10:40 pm

Blackbird,
I don't know what version you want.
The Portal 2 Version
or
The Orange Box Version

Portal 2 method:
Make a transition script (nut)
I prefer to edit the sp_transition_list.nut and save it as a different file.
Go in to the elevator entry and exit instance (arrival_departure_transition_ents.vmf". and find the entity "logic_script"
replace the name of the script with yours.
Add map names to the list at your pleasure.

Orange Box method:
In the map, put a trigger brush at the point where you want to change the map.
Tie it to a "trigger_changelevel".
Place an info_landmark in the middle of it.
then on the map you want to transition to. put an info_landmark there.
set the parameters of the trigger_changelevel.
You're done.

Portal 2 method:
Pros:
*You automatically start with a gun.
*You can use elevators easily without editing the logic.
*You have the Aperture Laboratories logo as the background in the transition, and loading indicatior lights, and logo, without the console appearing.
*Wont pull and prop within 50 units of the player's radius.
*Change version of the portal guns fast.

Cons:
*Not for use if you just started or inexperienced with scripting.

Orange Box method:
Pros:
*Easy and convenient.
*Recommended for inexperienced scripters.

Cons:
*Will pull in any prop with in 50 units of the player's radius to the next map.
*No loading image or lights or logo.
*You wont start with the portal gun. You will have to put one.
*You will have to modify the logic of the elevator.

Quote from MasterLagger on February 17, 2012, 10:59 pm

Spam Nugget wrote:

Note with what masterlagger said, if youre using env_globals, do this but use the command changelevel instead of map. This preserves env_global states between the transition.

But that's only if your using env_global, but still, good point. I would imagine if I was making Co-op maps that I would have to use "changelevel" command instead of just "map."

Quote from Spam Nugget on February 18, 2012, 6:24 am

Yes, for coop too. Just thought it was an important point to make.

Quote from BlackBird Studios on February 18, 2012, 6:18 pm

I really can't thank you guys enough. This has helped me out so much and I hope for future purposes, this conversation helps somebody else out. Don't think you're out of the ropes just yet, I'm sure Hammer will screw me over eventually.
Until then, bye.