Section Blocks Update

Play 0x54, server → client.

play · 0x54 · clientbound (server → client)

Changes multiple blocks inside one 16x16x16 chunk section. The server sends it when several blocks change in the same section in one tick instead of many BlockUpdate packets. Each record packs the block state ID and local position.

Sent by the server, read by the client. Listen for it with client.on("SectionBlocksUpdate", (data) => …) on the receiving side.

Fields

Send it

await client.sendPacket("SectionBlocksUpdate", {
  chunkCoordinates: /* Bitfield */,
  records: /* Array */,
});

Field aliases listed under Notes are accepted as alternative keys when writing.

Source: src/Core/Versions/776/Packets/play/clientbound/SectionBlocksUpdate.ts