ChunkHelper

A small client-side Fabric mod for Minecraft 26.3 that shows which chunks an ender pearl or a player at a given position would keep loaded. Use it when you build pearl stasis chambers, chunk loaders or AFK spots, so you know which chunks around a point really tick.

The outline is drawn in the world in the style of the F3+G chunk borders: three nested squares on the chunk borders, one per load state, plus a beam and a label on the exact point.

Usage

/ch <x> <z> pearl     show the chunks an ender pearl at this position loads
/ch <x> <z> player    show the chunks a player at this position loads
/ch clear             remove the outline
/ch                   short usage hint

/chunkhelper works the same as /ch.

• <x> <z> are block coordinates. ~ is relative to you, so /ch ~ ~ pearl uses your current position and /ch ~10 ~ pearl a point 10 blocks east.
• The point stays fixed where you set it. It does not follow you around.
• There is one point at a time: a new /ch command replaces the previous one.
• The outline only shows in the dimension where you set it, and it is removed when you leave the world or server.

After each command, the chat shows the chunk position and the size of every zone, for example:

[ChunkHelper] Ender pearl at -38 120 (chunk -3 7)
  ■ entity ticking 1x1   ■ block ticking 3x3   ■ loaded 5x5

What the colors mean

Each zone includes the zones inside it. For example, the blue square also contains the yellow and green ones.

How the sizes are calculated

Chunks are loaded through tickets. A ticket gives its chunk a level, and the level goes up by 1 per chunk outwards (square / chessboard distance). Level 31 or lower means entity ticking, 32 means block ticking and 33 means loaded but inactive.

Ender pearl A pearl puts one ticket with radius 2 (level 31) on the chunk it is in:

Player A player gets two kinds of tickets:

• a loading ticket (level 31) on every chunk within the server's view distance
• a simulation ticket on its own chunk at level 31 - simulation distance

Entities only tick where both reach level 31, so the zones are:

The mod uses the view and simulation distance the server sends to the client, not your own video settings. In singleplayer, these are your render distance and simulation distance.

Note: This is a preview of what a pearl or player would load at that point, based on the vanilla rules. It does not check whether those chunks are loaded right now.