Particle, execute and summon commands round co-ordinates to nearest block to the nearest block.

Hmmm it works fine for me. Are you wanting the particles to come out of the center of the player? Relative to player is always feet position. That setblock and any command works.

I used this in a command block clock:

execute @a[m=2] ~ ~ ~ particle footstep ~ ~0.1 ~ 0 0 0 1 1

the block box is the particle

See screenshot. Is this not what you are trying to achieve?

he wants it to be centered at the player not the block

He is standing on the edge of the block, and the particle appears in the middle of it, despite him having it spawn directly below him.

Sorry guys. Works perfectly fine with execute. I'll make a video.

Maybe for you, but for me, and evidently FVbico, using /execute makes no difference.

I used execute and it still spawns at the block, not at the player if it works fine for you, try the following:

stand at the edge of a block and look down
enter the particle command in the discription
is it directly at you, or is it at the center of the block?

You know what. I see it now. Apologies. Very specific coordinates. Perhaps clarify your title to explain how particle round up decimals for coordinates.

It's the "nearest block" that confused me. Because the "nearest block" is the one you are standing on. I think a better explanation would be that particle is always being displayed at .5 of the X and Z axis of whatever block you are at.

The more I think about this, the more I believe it is intended. Every other command except teleport, issues the coordinate in the exact center of to X/Z axis of the block. Setblock, summon, spawnpoint, testforblock, etc. I understand particle is a bit different than these, but it should act the same a summon Item.

you can use /summon [mob] ~0.0 ~0.0 ~0.0 to spawn at you, not at the block, same for testfor
all block related commands have to do that
/particle isn't block related, so I think this isn't intended

The ~0.0 didn't work for me, however, in the game, mobs are always spawned in a single block (as far as I know)

Particles are not. Although it is sometimes relative to blocks, it is often relative to entities that particles appear. The effects of the command should reflect that.

Yeah but you can do that with particle too.

FVbico, run this command off a clock

execute @p ~ ~ ~ /summon Creeper ~0.0 ~-3.0 ~0.0

In peaceful it's easier to see, the creeper always summons to the direct center of the X/Z axis.

I think the real bug is that execute doesn't allow for anything outside the direct center of the X/Z axis

just tested, yeey the decimal co-ordinates are all broken since some snapshots, 1.7 works fine
not just execute, all decimal cords

So I think this bug report should be updated for the execute command, not the particle command.

it also does the same for player executed summon, just by typing /summon Zombie ~0.0 ~0.0 ~0.0

The issue effects non-executed particle commands too.

But I'll add that it effects execute commands.

See

/particle heart ~ ~ ~0.5 0 0 0 0

Works to offset the particle

It offsets it from rounded coordinates though.

allright, this is getting weirder and weirder...

It offsets from the center

So we are clear here, particle gets displayed from the block not the person. But execute seems to round any coordinate to the center of the X/Z axis of the block. I positive execute is the real bug here.

But they don't round coordinates to the nearest block. Only if you use execute. I mean they do round up by default, but you can move the location of particle or summon with decimal places. With execute, you cannot.

Notice, you can particle on the corner of a block doing this.

/particle heart ~0.5 ~0.5 ~0.5 0 0 0 0

but the decimals should also work without execute, who don't
so /summon Zombie 0.0 54 0.0 should also work but does /summon Zombie 0.5 54.5 0.5
it didn't do that in 1.7

so the game now adds 0.5 to x, y and z in all commands

nevermind

Summon works fine without execute

summon Creeper ~0.5 ~1 ~0.5

I'm confused. The direct center of a block is X - .5, Z - .5. Summon ~0.0, is summoning no decimals from center. Works fine. Execute only works to the center no matter what you put in.

my bad, I got confused a lot
and everytime the mob moved, so I could not see it correctly

I execute them 2 blocks below me while flying.

Still, this bug should definitely be changed to /execute does not accurately activate for decimal coordinates.

Or execute on relative always activates to direct center of X/Z axis.

both execute and particle 😉

As I was confused, the description still indicates Bryn Macaulay claims the particle command should activate from the player. Which is not the case. That needs to be changed too.

Particle works fine. As I posted (run in a clock)

/particle heart ~0.5 ~0.5 ~0.5 0 0 0 0

Notice:
Relative to the center of the block, particle is being accurately displayed 0.5 from center.

MC-62638 has already stated that particles happen from the command block, not the player.

by adding 0.5 everywere they do not work corectly, depends on your location on the block, mine appeared way over on the other side of the block

using /particle heart ~0.0 ~0.0 ~0.0 0 0 0 0 should always be below you, but it's not

here is a screenshot of your particle command, moved up from that corner

Because particle is activated from the block. Not the player. If you type it in, it will activate from the air block you are standing in.