In vanilla 1.8 using command blocks, is it possible to change a player's spawn point after they first join a server?
When a player first joins a server they are in location "A" When they press a button to leave the spawn point (or use any other trigger) they are sent to location "B" If they die after leaving the spawn they will respawn in location "B"
No mods or plugins 1.8 Vanilla McEdit map editing is OK
Create a new scoreboard objective "new"
/scoreboard objectives add new dummy
Make the world spawn where you want the non-new players to spawn. Put a pressure plate under them (So they spawn on a pressure plate) that triggers a command block with the command
testfor @p[score_new_min=1,score_new=1]
This will test for any player with a score of one in "new" Make that command block connect to a comparator that connects to another command block with the command
tp @p[score_new_min=1,score_new=1] x y z
Where x, y, and z are the coordinates of the place you want new players to spawn.
If you are going to have a lot of new players spawning at once however, this system might teleport the wrong new player. In that case, do this system except make the pressure plate in front of where they spawn, and make it their only option to walk over that pressure plate to get to the main spawn room.
This is one of the cases where using stat objectives on a scoreboard comes in handy, since it is impossible to detect players who don't have a score (i.e. a score of NULL, which is different from a score of 0!). stat objectives increase automatically depending on player actions, making them ideal for this. Set up a timePlayed objective like this:
/scoreboard objectives add timePlayed stat.playOneMinute
Contrary to the name, playOneMinute objectives increase at every game tick (making the value 1200 after one minute). You can use this objective to detect new players using @a[score_timePlayed=1].
To teleport new Players to a fixed point, set up a setblock clock and have it run
/tp @a[score_timePlayed=1] x y z
where x y z are the coordinates of your spawn.
Credit goes to /u/Boxfigs on reddit.
Should you want to re-declare an existing player as new (e.g. for testing), you can use
scoreboard players reset P timePlayed
where P is any valid target selector.
