Server Packets: Changes to the World / Blocks

Packets used to inform the client about changes to the world / blocks.  These are sent by a variety of different callers, in particular

•         PlayerInstance (for changes to blocks or chunks)
•         WorldServer
•         WorldManager (for animation and sound effects)

They are nearly all processed by WorldClient.

	Typical server origin	NetClientHandler (Client processing)	Called by Client during processing
Packet51MapChunk Send an entire chunk to the client.	PlayerInstance .sendChunkUpdate (if many modified blocks)	.handleMapChunk() Performs full chunk update of blocks, metadata, light levels, and optionally biome data.	WorldClient
Packet52MultiBlockChange Send a number of changed blocks (with metadata) at once.	PlayerInstance .sendChunkUpdate  (for modified blocks)	.handleMultiBlockChange() Change all of the blocks listed in the packet – all must be within a single stack of 16 chunks high (y = 0-256)	WorldClient
Packet53BlockChange Change a single block+metadata	ItemInWorldManager PlayerInstance NetServerHandler (packet 14 & 15)	.handleBlockChange()	WorldClient
Packet54PlayNoteBlock Trigger a BlockEvent on the client (eg play a note, extend/retract a piston)	WorldServer .sendAndApplyBlockEvents	.handleBlockEvent()	WorldClient. addBlockEvent
Packet55BlockDestroy Tell the client to show a block destruction animation.	WorldManager .destroyBlockPartially	.handleBlockDestroy() Doesn’t actually destroy the block, just creates a DestroyBlockProgress at the specified [x,y,z] to control the animation.	WorldClient .destroyBlockInWorldPartially
Packet56MapChunks Send multiple chunks to the client.	EntityPlayerMP . onUpdate()	.handleMapChunks() Performs full chunk update of blocks, metadata, light levels, and optionally biome data.	WorldClient
Packet60Explosion	WorldServer.newExplosion	.handleExplosion() Performs the explosion on the client (sound, move player, destroy blocks, item drop, etc)	Explosion (on WorldClient)
Packet61DoorChange Play a sound on the client	WorldManager .playAuxSFX .broadcastSound	.handleDoorChange() appears limited to one or two specific sounds only	WorldClient .playAuxSFX .playBroadcastSound
Packet62LevelSound	WorldManager CommandPlaySound	.handleLevelSound()	WorldClient .playSound
Packet63WorldParticles Spawn particles on the client	Appears to be unused	.handleWorldParticles()	WorldClient .spawnParticle
Packet70GameEvent Sends various game events to client	EntityPlayerMP WorldServer EntityArrow ServerConfigurationManager	.handleGameEvent() Chat message, raining on/off, game type (survival etc), show “game won” screen, demo mode (?), play a hit sound (by arrow)	WorldClient EntityClientPlayerMP + several others
Packet71Weather Lightning strike	WorldServer	.handleWeather()	WorldClient
Packet130UpdateSign Tells the client the text on a sign.	PlayerInstance EntityPlayerMP	.handleUpdateSign()	TileEntitySign
Packet131MapData Sends the data for the current map to the client, if the player is currently looking at the map in their hands. Also hijacked by Forge for sending other non-map data?	EntityPlayerMP    ItemMap PacketDispatcher .getTinyPacket	.handleMapData()	FMLNetworkHandler .handlePacket131Packet --->ItemMap.getMPMapData (vanilla) Or NetworkRegistry.handleTinyPacket
Packet132TileEntityData Updates a TileEntity with new data, eg TileEntityMobSpawner TileEntityBeacon	Several TileEntityXXXX . getDescriptionPacket (Name is misleading)	.handleTileEntityData() Retrieves the TileEntity at the given [x,y,z]  and calls.readFromNBT (selected vanilla) or .onDataPacket (all others)	TileEntity .readFromNBT .onDataPacket  (FORGE)