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I want to summon an arrow with the same velocity as an egg that has just been thrown. I know about the NBT tag Motion:[x,y,z], but I have no idea how to match that with the velocity of another entity.

I tried to just have the arrow be constantly be teleported to the egg, but it doesn't land where the egg lands.

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  • Teleporting does not copy velocity? Now I have to edit my answer to another question in this forum... Jun 22, 2017 at 3:37

2 Answers 2

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You can transfer NBT data from one entity to another in newer versions of minecraft. To replace all eggs with arrows with the same Motion-tag, you could use these three commands, executed in a repeating command block and then two chain command blocks:

/execute at @e[type=egg] run summon minecraft:arrow ~ ~ ~
/execute as @e[type=minecraft:arrow] at @s run data modify entity @s Motion set from entity @e[type=egg,distance=0,limit=1] Motion
/kill @e[type=egg]

The first command summons an arrow at the position of every egg.

The second command sets the Motion-tag of every arrow to the same value as any egg that is in exactly the same position.

The third command kills all eggs.

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The short answer is: you can't.


The longer answer is: You still can't, but here is why:
You can't transfer NBT data from one entity to another. Normally you might be able to work around that by detecting the NBT data in the first entity with a few hardcoded values, and then giving that same tag to the other entity.
This however won't work for the Motion tag since that incorporates three double values, and a typical Motion tag looks something like this: Motion[0.17361829472d,1.38572958294d,0.72483746234d] (good luck finding that one with hardcoded values)

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    Do you think that it will be possible to do the midair-replacement in 1.13 with the ^ ^ ^ coordinates? Jul 9, 2017 at 13:37
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    form what it looks like now, you'll be able to copy the facing but not other NBT data. using ^ ^ ^ you could however teleport the arrows along the way they are supposed to, maybe that will help. But I really can't say anthing for sure yet.
    – Plagiatus
    Jul 11, 2017 at 12:25
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    In 1.14 you can copy NBT. Apr 9, 2019 at 8:26
  • Thanks for the reminder. in 1.13 and 1.14 the answer above wouldn't be correct anymore. I'll try to find the time to edit in the current possibilities
    – Plagiatus
    Apr 10, 2019 at 9:09

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