Minecraft – How to select flying arrows by NBT data given to them in item form

minecraft-commandsminecraft-java-edition

On my private (vanilla 1.9) Minecraft server, me and my friends are trying to make custom arrows, such as TNT, ender, high explosive etc. These arrows have NBT data such as a tag "tntarrow" for a TNT arrow. However, when an arrow gets shot, it seems to 'lose' it's NBT data for some reason, so we have no way of telling normal, TNT and ender arrows apart in the air.

Is there any way of working out what kind of arrow (normal, TNT, ender etc) an arrow is while flying, so that when arrows land I can apply my own commands to activate the custom arrow's effects? I'm happy to re-purpose tipped arrows that give buffs (strength, speed, healing etc) if that is possible.

Just to clarify, if I give a player an arrow with a tag "tntarrow", like so:

/give player arrow 1 0 {Tags:["tntarrow"]}

Then, when it's shot, this selector doesn't work:

@e[type=Arrow,tag=tntarrow]

So, I would like to have some way of having only certain arrows being selected.

If it is possible to re-purpose tipped arrows, then I would also like to know how to do that. (For me to re-purpose them, I need to remove potion effects and have a way of selecting them.)

Best Answer

Adding Tags to the item will not be set as the entity's Tags data. All the item data itself will be lost except for Potion and CustomPotionEffects, which are copied to the arrow entity if existent.

Tipped arrows will be necessary, but you can apply custom effects to reduce any issues should it strike a player or mob, such as setting the duration to 0. Currently the Instant Healing effect does not function on tipped arrows, but you may need to switch to something else should it work in the future.

The amplifier would be how you'd differentiate arrows from one another.

Example arrows to provide:

/give @p minecraft:tipped_arrow 64 0 {CustomPotionEffects:[{Id:6b,Duration:0,Amplifier:0b}]}

/give @p minecraft:tipped_arrow 64 0 {CustomPotionEffects:[{Id:6b,Duration:0,Amplifier:1b}]}

Then you'd label those arrows based on the effects it has, with the amplifier making each one unique:

/scoreboard players tag @e[type=Arrow,tag=!tntarrow] add tntarrow {CustomPotionEffects:[{Id:6b,Duration:0,Amplifier:0b}]}

/scoreboard players tag @e[type=Arrow,tag=!custom2] add custom2 {CustomPotionEffects:[{Id:6b,Duration:0,Amplifier:1b}]}

And finally, target based on that label:

/say @e[type=Arrow,tag=tntarrow] is a "tntarrow".

Related Solutions

Minecraft – How to you summon/create player shot arrows using commands

If this is possible, the player who fired the arrow, either by UUID or by username, should be stored somewhere for each arrow.

First I checked the wiki for an arrow entity's NBT data. But as you said, while ThrownEnderpearl, ThrownExpBottle, ThrownPotion, and Snowball all have an ownerName field, Arrow does seem to have anything indicating it would store the player who fired it.

I fired an arrow and checked its NBT in game, as I've noticed the wiki occasionally misses out data tags:

enter image description here

But again there was nothing that stored my player ID. (Note that UUIDMost and UUIDLeast are both for identifying the entity itself, not who fired it)

I wanted to see if the data of who shot an arrow persists through the world closing and opening. To do this, I:

Created a world
Shot an arrow straight up
Closed the world
Opened the world
Quickly opened the world to LAN
Logged in with an account that was on survival, positioned directly below the arrow

When the arrow hit the survival player, not only was no ping sound played for hitting a player, but the message in chat simply showed that the player was shot by "Arrow", rather than me:

enter image description here

(Note that both players were logged on, the one that shot the arrow and the one that got hit by it)

Because of this, I believe that the player who fired an arrow is not actually stored anywhere in an arrow's data.

Thus the answer to "Is there any way to summon arrows that are shot by a player or mob?" unfortunately seems to simply be no.

I suspect death messages and ping sounds are done temporarily in code, rather than stored anywhere that can be manipulated with commands. They are lost when the world reloads, and are not stored anywhere in the individual arrow's data.

Minecraft – make a big explosion when I shoot an arrow

Yes, you can. Here's how:

Execute this command:

/scoreboard objectives add selector dummy

Give yourself a Power 6 and Infinity (optional) bow (impossible to get in survival) and an arrow:
```
/give @p minecraft:bow 1 0 {ench:[{id:48,lvl:6}, {id:51, lvl:1}]}  
/give @p minecraft:arrow 1
```
Power a Repeating Command Block with this command:
```
/scoreboard players add @e[type=Arrow] selector 1 {damage:5.5d,inGround:1b}
```
This will select all arrows fired from a power 6 bow (with damage 5.5) that are in the ground.

Next to the last Command Block place two Chain Command Blocks (in a row) - with a Fireball summon command and arrow killing command (at the edge):

/execute @e[type=Arrow,score_selector_min=1] ~ ~ ~ /summon Fireball ~ ~ ~ {direction:[0.0,-9.0,0.0],ExplosionPower:15}  
/kill @e[type=Arrow,score_selector_min=1]

Go shoot your bow out! Good luck!

P.S. If it lags your Minecraft, lower the ExplosionPower value.

Best Answer

Related Solutions

Minecraft – How to you summon/create player shot arrows using commands

Minecraft – make a big explosion when I shoot an arrow

Related Topic