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Ticking area

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A ticking area is a player-specified group of chunks that continues to be updated even when there is no player nearby. Because the chunks remain active, processes such as growth, decay, spawning, movement, and redstone operations aren't suspended in them when no players are present, provided at least one player remains somewhere in the dimension.

Behavior[edit | edit source]

Normally, only the chunks closely surrounding a player are updated by the game. These chunks are said to be in the player's chunk update range. As the player moves through the world, new chunks that come into range are added to the list of updated chunks and older chunks that pass out of range are removed. Only the chunks in the list are updated to reflect the passage of time. This means, for instance, that if a player spends a lot of time exploring or in another dimension, his crops won't grow and any cooking, smelting, or automated farming underway when he left will still be unfinished when he returns.

Ticking areas solve this problem by keeping player-designated chunks from being suspended. Each chunk in a ticking area is updated exactly as if it were perpetually in a player's chunk update range.

Events processed[edit | edit source]

The following time-related events occur without interruption in ticking areas, provided there is at least one player in the same dimension (the Overworld, The Nether, or The End) as the ticking area:

Suspended events[edit | edit source]

Many of the above events involve entities moving or spreading, which raises the possibility of updates in a ticking area affecting blocks in outside chunks. If an outside chunk is within any player's chunk update range, of course, the chunk is active and these events will proceed as usual. However, if the outside chunk is inactive the effects are suspended in most cases. Specifically,

  • Flowing water or lava can spread to the first adjacent block in an outside chunk, but the flow becomes suspended there until the outside chunk becomes active.
  • Fire can spread to the first adjacent flammable block outside the ticking area. Like water and lava, it becomes suspended there; although visible, its animation does not run and it cannot spread further until the outside chunk becomes active.
  • Grass and mycelium can spread to the first adjacent block in an outside chunk, but the affected block will not actually change its appearance until its chunk becomes active; it will then change instantly. Grass and mycelium cannot spread beyond the first such block, nor from such a block into the ticking area, until the outside chunk becomes active.
  • Pumpkin and melon stems growing on the edge of a ticking area can place their fruits on an adjacent block in an outside chunk.
  • An entity (mob, minecart, arrow, etc.) that attempts to move into an outside chunk becomes suspended as soon as it leaves the ticking area. It remains visible but motionless. When the outside block becomes active, the entity resumes moving.
  • Exploding TNT can damage or destroy blocks in an inactive chunk, and unlike other events its effects are not limited to adjacent blocks. However, secondary effects in the outside chunk are suspended until the chunk becomes active. For instance, if an explosion destroys a block that supported sand or gravel, the sand or gravel does not fall immediately. The same thing happens with items that were attached to destroyed blocks, such as item frames and redstone torches; they do not drop until the chunk is activated.
  • Primed TNT that has been launched into an inactive chunk is suspended in mid-air within the first outside block it enters. It disappears until the outside chunk becomes active, at which time it resumes its flight and countdown.

Spawning[edit | edit source]

Spawning in ticking area chunks follows the same rules as for chunks within a player's chunk update range. It observes mob caps, light requirements, and rules about where specific types of mobs may spawn and how much overhead space they require. However, if no actual player is within range of a ticking area chunk the rules about distance from a player do not apply: Mobs can spawn anywhere within the ticking area and do not instantly despawn if no player is within 128 blocks. This means that when you return to your ticking area after a journey, you may find a large number of hostile mobs waiting for you, especially in or near unlit areas and areas protected from daylight. To prevent this, special care should be taken to light your ticking areas and to cover surfaces with non-spawnable blocks such as slabs and carpets.

Creation and management[edit | edit source]

A player creates and manages ticking areas by executing a /tickingarea command. Up to ten ticking areas, each containing up to 100 chunks, can exist at one time in a world. Note that commands can only be used in a world if cheats are enabled. This makes the world ineligible for earning achievements, so ticking areas and earning achievements are mutually exclusive.

To create a ticking area, specify its location and size in a /tickingarea add command. There are two forms:

  • In the first form, you specify two pairs of coordinates in the world. The coordinates specify the opposite corners—either northeast and southwest or northwest and southeast—of the ticking area.
  • In the second form, you specify a center coordinate and a radius of 1 to 4 chunks. Although these arguments suggest a circular area, in actuality the ticking area includes all chunks within 'r' chunks, including diagonally, of the chunk containing the center. This defines a square whose sides are twice the given radius + 1. For example, if you specify a radius of 2, the ticking area will be a square 5 chunks on a side.

Optionally, you can also specify a name for the ticking area to identify it in subsequent commands.

Note that the Y coordinate is checked for validity but otherwise ignored. This is because a chunk encompasses an entire column of blocks from the bottom of the world to its top, so it includes every possible Y value.

To display a list of current ticking areas, execute a /tickingarea list command. This shows each ticking area's name (if provided) and corner coordinates (for the first form) or center coordinates and radius (for the second form). The coordinates shown in the list may not match those you entered because the game adjusts them to the actual corner or center coordinates of a chunk. By default, this command only lists ticking areas in your current dimension; you can use the optional all-dimensions argument to see all ticking areas in the world.

To remove a ticking area from the list, execute a /tickingarea remove command specifying either the ticking area's name or the coordinates of a point in the world. If you specify a name, only that ticking area is deleted. If you specify a point, all ticking areas in the current dimension that contain that point are deleted. An optional remove_all argument removes all ticking areas in all dimensions.

Comparison with spawn chunks[edit | edit source]

Instead of ticking areas, Java Edition has a game mechanic called spawn chunks that serves a similar purpose. However, there are a few differences. The following table contrasts spawn chunks and ticking areas.

Property Spawn Chunks Ticking Areas
Number of areas supported 1 10
Position Centered on world spawn point Specified by player
Size 17 x 17 maximum (289 chunks) Specified by player; 1 to 100 chunks
Dimensions where usable Overworld Any
Crops grow No Yes
Leaves decay No Yes
Grass and mycelium spread No Yes
Ice forms and melts No Yes
Hostile mobs spawn >128 blocks from player No Yes
Passive mobs spawn >240 blocks from player No Yes
Explosions break blocks in nearby chunks No Yes

History[edit | edit source]

Bedrock Edition
1.2 build 1 Added ticking areas.

Issues[edit | edit source]

Issues relating to “Ticking area” are maintained on the issue tracker. Report issues there.