Often, when asking about command block contraptions, people suggest using a "setblock" or "fill" clock?
What are those and how do I make them?
Minecraft – How to make a setblock or a fill clock
minecraft-commandsminecraft-java-edition
Related Solutions
Try:
/execute <selector> ~ ~ ~ fill <relative coordinates> air 0 replace wool
[EDIT]
If you are wanting the block to disappear after a certain amount of time, say, 30 redstone ticks (60 game ticks), you could summon a WitherSkull below the player and use the execute command on it.
To make the block disappear, you would add a new scoreboard command, lifetime, for instance, and run /scoreboard players add @e[type=WitherSkull] lifetime 1 with a setblock or fill clock, then execute another fill command on every wither skull with a certain lifetime value, like:
/execute @e[type=WitherSkull,score_lifetime_min=31] ~ ~ ~ /fill ~ ~ ~ ~ ~ ~ wool 0 replace air.
Then, you would kill the wither skull: /kill @e[type=WitherSkull,score_lifetime_min=35].
Here is a screenshot of what I did:
/execute @p[rm=6] ~ ~ ~ /say The command worked/execute @p[r=5] ~ ~ ~ /say The command did not work
(both after the /spreadplayers command). The only problem with that is that it will still act as if the command didn't work if a player gets positioned inside the 5 Blocks radius.
EDIT: It is now completely possible with the CommandStat Data Tag:
/blockdataCommand Block Coordinates{CommandStats:{SuccessCountName:"Fake Player Name / Entity / whatever you're gonna use",SuccessCountObjective:"Scoreboard Objective Name"}}
Basically, you can make the SuccessCount output to a scoreboard. See the video below for more info!
.EDIT 2: Maybe I should mention that you can then do some sort of execute on the entity if it has a score of at least 1. Also, you should set the score back to 0 at the end of every tick (/cycle of the clock).
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Best Answer
First off, if you are playing in Minecraft 1.9 or later, you don't need to use these clocks. Repeating and chain command blocks have the same functionality (see below) and more, and are much easier to use. Use them instead.
What are those?
A setblock or fill clock is a command block contraption based on using the
/setblockor/fillcommands to alternately set redstone blocks and regular blocks in the same spot, therefore activating adjacent command blocks 20 times a second. They are therefore also referred to as "20Hz" clocks.They are extremely useful for making command block contraptions for multiple reasons:
This allows you to, for example, set a scoreboard objective to 0 for everyone, and to 1 for certain players directly afterwards, without their score "flickering".
How do I make them?
Both clocks require two command blocks as a base. One to set the redstone blocks, the other to set the regular block.
Setblock clock
A
setblockclock is slightly simpler than it's larger cousin. It creates and destroys a single redstone block between the two command blocks.Place two command blocks in a line, with a single free space in between. Remember what I said about the well-ordered execution earlier? This is based on the (relative) coordinates the command blocks are placed in, so let's find out!
Press F3 to enter the debug screen. If you are playing on 1.8+ and the gamerule
reducedDebugInfois false (the default), your cursor turns into a red green and blue thingy. This tells you the direction of the three major coordinate axes. Red points towards positive X, Green towards positive Y and Blue towards positive Z, that is RGB corresponds to XYZ.No matter how you oriented your command blocks, locate the one at the lower coordinate and set it to
In the other one, put
This example is for the X-axis, for another axis, move the
~1and~-1to the corresponding position in the setblock command, e.g.~ ~ ~1/~-1for the Z-axis. I used smoothstone as my alternate block, but you can use any other solid, non-transparent block (transparent blocks, including air blocks, would cause lighting updates!).Place a redstone block in the center to jump-start the clock. If everything is done correctly, this block is immediately recreated when you break it.
You can now place up to 4 other command blocks next to the redstone block. Command blocks on the same axis activate from lower to higher coordinate. The execution order can be more difficult when working on different axes at the same time though. If more than two of your commands require to be run in a specific order, I suggest using a fill clock instead.
Fill clock
A
fillclock uses the same basic principles as thesetblockclock, but allows for more commands to be run by creating a line of redstone blocks rather than a single block.Instead of the commands above, use (again, command blocks along the X-axis)
This creates a 1 block wide, 5 block long line of redstone blocks along the z-axis. The length is determined by the second set of coordinates.
Place your other commands along this line. The activation order will be along this line: At every redstone block the command block at the lower coordinate will be executed first. Afterwards, this continues at the next redstone block in the line.
Wait, what? How does that work?
The way this works is that at the beginning of every game tick, the game sees a newly created redstone block next to the command blocks, and starts to execute the commands. It always starts at the lower coordinate, so it replaces the redstone block with stone. Directly afterwards, the second command is executed. While the command block is technically not powered at the moment, it was triggered and runs, immediately re-replacing the stone with a redstone block. Rinse and repeat 20 times a second.