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So I'm trying to build a custom map, and I don't want people to be entering nether if someone would build a portal.
With only command blocks or just commands, is it be possible for the nether portal not teleport you anywhere, teleport you a few blocks away from it, or just teleport you back into the map's center? (In singleplayer)
First, have a repeating command block set to Always Active testing for a minecraft:portal block(the purple part of the nether portal):
/execute @p ~ ~ ~ testforblock ~ ~ ~ minecraft:portal
It will point into another repeating command block, also Always Active, and it will also be set to Conditional, using /spreadplayers to teleport them 2-4 blocks out of the portal.
/execute @p ~ ~ ~ spreadplayers ~ ~ 2 4 true @p
The reason /execute is used is to teleport them within a 2-4 block range of where they are currently.
/execute @p ~ ~ ~ spreadplayers ~ ~ 2 4 true wrong. Fixed.
/execute @p ~ ~ ~ spreadplayers ~ ~ 2 4 true @p. But your way works too!
@p will not work for multiplayer, since it only targets the player closest to the command block. Use @a and @a[c=1] in the execute and subsequent commands, respectively, instead.
detect scheme instead of testforblock: /execute @a ~ ~ ~ detect ~ ~ ~ minecrat:portal -1 spreadplayers ~ ~ 2 4 true @a[c=1].
