Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.8.8, protocol 47]]) to the current pre-release (currently [[Protocol version numbers|15w36d, protocol 70]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.14.4, protocol 498]]) to the current pre-release (currently [[Protocol version numbers|1.15.2, protocol 578]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
__NOTOC__
+
 
 
== Contents ==
 
== Contents ==
 +
 +
<div style="float:right;">__TOC__</div>
  
 
=== Data types ===
 
=== Data types ===
  
* [[#Chunk Section|Chunk Section]]
+
No changes so far.
* [[#Entity Metadata|Entity Metadata]]
 
  
 
=== Packets ===
 
=== Packets ===
Line 15: Line 16:
 
  ! ID
 
  ! ID
 
  ! Packet name
 
  ! Packet name
  ! colspan=2 | Documentation
+
  !colspan="2"| Documentation
 
  |-
 
  |-
! colspan=4 | Handshaking serverbound
+
!colspan="4"| Handshaking serverbound
 
{{PacketList|0x00|Handshake}}
 
{{PacketList|0x00|Handshake}}
 
  |-
 
  |-
! colspan=4 | Play clientbound
+
!colspan="4"| Play clientbound
{{PacketList|{{Change|0x0E|0x00}}|Spawn Object}}
+
{{PacketList|0x03|Spawn Mob}}
{{PacketList|{{Change|0x11|0x01}}|Spawn Experience Orb|pre=unchanged}}
+
{{PacketList|0x05|Spawn Player}}
{{PacketList|{{Change|0x2C|0x02}}|Spawn Global Entity|pre=unchanged}}
+
{{PacketList|{{change|0x5C|0x08}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|{{Change|0x0F|0x03}}|Spawn Mob}}
+
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{Change|0x10|0x04}}|Spawn Painting|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x0A}}|Update Block Entity}}
{{PacketList|{{Change|0x0C|0x05}}|Spawn Player}}
+
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
{{PacketList|{{Change|0x0B|0x06}}|Animation|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
{{PacketList|{{Change|0x37|0x07}}|Statistics|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
{{PacketList|{{Change|0x25|0x08}}|Block Break Animation|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{Change|0x35|0x09}}|Update Block Entity|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x24|0x0A}}|Block Action|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Multi Block Change|pre=unchanged}}
{{PacketList|{{Change|0x23|0x0B}}|Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x11}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|0x0C|Boss Bar|rel=added}}
+
{{PacketList|{{change|0x11|0x12}}|Declare Commands|pre=unchanged}}
{{PacketList|{{Change|0x41|0x0D}}|Server Difficulty|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Confirm Transaction (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x3A|0x0E}}|Tab-Complete|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x02|0x0F}}|Chat Message|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Window Items|pre=unchanged}}
{{PacketList|{{Change|0x22|0x10}}|Multi Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Window Property|pre=unchanged}}
{{PacketList|{{Change|0x32|0x11}}|Confirm Transaction|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Set Slot|pre=unchanged}}
{{PacketList|{{Change|0x2E|0x12}}|Close Window|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{Change|0x2D|0x13}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x30|0x14}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{Change|0x31|0x15}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{Change|0x2F|0x16}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Entity Status|pre=unchanged}}
{{PacketList|0x17|Set Cooldown|rel=added}}
+
{{PacketList|{{change|0x1C|0x1D}}|Explosion|pre=unchanged}}
{{PacketList|{{Change|0x3F|0x18}}|Plugin Message|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1E}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{Change|0x40|0x19}}|Disconnect|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1F}}|Change Game State}}
{{PacketList|0x1A|Entity Status}}
+
{{PacketList|{{change|0x1F|0x20}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{Change|0x27|0x1B}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x21}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|0x1C|Unload Chunk|rel=added}}
+
{{PacketList|{{change|0x21|0x22}}|Chunk Data}}
{{PacketList|{{Change|0x46|0x1D}}|Set Compression|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x23}}|Effect|pre=unchanged}}
{{PacketList|{{Change|0x2B|0x1E}}|Change Game State|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x24}}|Particle}}
{{PacketList|{{Change|0x00|0x1F}}|Keep Alive|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x25}}|Update Light|pre=unchanged}}
{{PacketList|{{Change|0x21|0x20}}|Chunk Data}}
+
{{PacketList|{{change|0x25|0x26}}|Join Game}}
{{PacketList|{{Change|0x28|0x21}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x27}}|Map Data|pre=unchanged}}
{{PacketList|{{Change|0x2A|0x22}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x28}}|Trade List|pre=unchanged}}
{{PacketList|{{Change|0x29|0x23}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x29}}|Entity Relative Move|pre=unchanged}}
{{PacketList|{{Change|0x01|0x24}}|Join Game|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2A}}|Entity Look And Relative Move|pre=unchanged}}
{{PacketList|{{Change|0x34|0x25}}|Map}}
+
{{PacketList|{{change|0x2A|0x2B}}|Entity Look|pre=unchanged}}
{{PacketList|{{Change|0x15|0x26}}|Entity Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x2C}}|Entity|pre=unchanged}}
{{PacketList|{{Change|0x17|0x27}}|Entity Look And Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2D}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x16|0x28}}|Entity Look|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2E}}|Open Book|pre=unchanged}}
{{PacketList|{{Change|0x14|0x29}}|Entity|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2F}}|Open Window|pre=unchanged}}
{{PacketList|{{Change|0x36|0x2A}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x30}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{Change|0x39|0x2B}}|Player Abilities|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x31}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{Change|0x42|0x2C}}|Combat Event}}
+
{{PacketList|{{change|0x31|0x32}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x38|0x2D}}|Player List Item|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x33}}|Combat Event|pre=unchanged}}
{{PacketList|{{Change|0x08|0x2E}}|Player Position And Look|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x34}}|Player Info|pre=unchanged}}
{{PacketList|{{Change|0x0A|0x2F}}|Use Bed|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x35}}|Face Player|pre=unchanged}}
{{PacketList|{{Change|0x13|0x30}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x36}}|Player Position And Look (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x1E|0x31}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x36|0x37}}|Unlock Recipes|pre=unchanged}}
{{PacketList|{{Change|0x48|0x32}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x38}}|Destroy Entities|pre=unchanged}}
{{PacketList|{{Change|0x07|0x33}}|Respawn|pre=unchanged}}
+
{{PacketList|{{change|0x38|0x39}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{Change|0x19|0x34}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x3A}}|Resource Pack Send|pre=unchanged}}
{{PacketList|{{Change|0x44|0x35}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x3A|0x3B}}|Respawn}}
{{PacketList|{{Change|0x43|0x36}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x3B|0x3C}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{Change|0x09|0x37}}|Held Item Change|pre=unchanged}}
+
{{PacketList|{{change|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
{{PacketList|{{Change|0x3D|0x38}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
{{PacketList|{{Change|0x1C|0x39}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x3E|0x3F}}|Camera|pre=unchanged}}
{{PacketList|{{Change|0x1B|0x3A}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x3F|0x40}}|Held Item Change (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x12|0x3B}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
{{PacketList|{{Change|0x04|0x3C}}|Entity Equipment}}
+
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
{{PacketList|{{Change|0x1F|0x3D}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x43}}|Display Scoreboard|pre=unchanged}}
{{PacketList|{{Change|0x06|0x3E}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x43|0x44}}|Entity Metadata|pre=unchanged}}
{{PacketList|{{Change|0x3B|0x3F}}|Scoreboard Objective|pre=unchanged}}
+
{{PacketList|{{change|0x44|0x45}}|Attach Entity|pre=unchanged}}
{{PacketList|{{Change|0x3E|0x40}}|Teams}}
+
{{PacketList|{{change|0x45|0x46}}|Entity Velocity|pre=unchanged}}
{{PacketList|{{Change|0x3C|0x41}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x46|0x47}}|Entity Equipment|pre=unchanged}}
{{PacketList|{{Change|0x05|0x42}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x47|0x48}}|Set Experience|pre=unchanged}}
{{PacketList|{{Change|0x03|0x43}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x48|0x49}}|Update Health|pre=unchanged}}
{{PacketList|{{Change|0x45|0x44}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x49|0x4A}}|Scoreboard Objective|pre=unchanged}}
{{PacketList|{{Change|0x33|0x45}}|Update Sign|pre=unchanged}}
+
{{PacketList|{{change|0x4A|0x4B}}|Set Passengers|pre=unchanged}}
{{PacketList|{{Change|0x47|0x46}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x4B|0x4C}}|Teams|pre=unchanged}}
{{PacketList|{{Change|0x0D|0x47}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x4C|0x4D}}|Update Score|pre=unchanged}}
{{PacketList|{{Change|0x18|0x48}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x4D|0x4E}}|Spawn Position|pre=unchanged}}
{{PacketList|{{Change|0x20|0x49}}|Entity Properties}}
+
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
{{PacketList|{{Change|0x1D|0x4A}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
{{PacketList|0x26|Map Chunk Bulk|pre=removed}}
+
{{PacketList|{{change|0x50|0x51}}|Entity Sound Effect|pre=unchanged}}
{{PacketList|0x49|Update Entity NBT|pre=removed}}
+
{{PacketList|{{change|0x51|0x52}}|Sound Effect|pre=unchanged}}
|-
+
{{PacketList|{{change|0x52|0x53}}|Stop Sound|pre=unchanged}}
! colspan=4 | Play serverbound
+
{{PacketList|{{change|0x53|0x54}}|Player List Header And Footer|pre=unchanged}}
{{PacketList|0x00|Keep Alive|rel=Keep Alive 2|pre=unchanged}}
+
{{PacketList|{{change|0x54|0x55}}|NBT Query Response|pre=unchanged}}
{{PacketList|0x01|Chat Message|rel=Chat Message 2|pre=unchanged}}
+
{{PacketList|{{change|0x55|0x56}}|Collect Item|pre=unchanged}}
{{PacketList|0x02|Use Entity}}
+
{{PacketList|{{change|0x56|0x57}}|Entity Teleport|pre=unchanged}}
{{PacketList|0x03|Player|pre=unchanged}}
+
{{PacketList|{{change|0x57|0x58}}|Advancements|pre=unchanged}}
{{PacketList|0x04|Player Position|pre=unchanged}}
+
{{PacketList|{{change|0x58|0x59}}|Entity Properties|pre=unchanged}}
{{PacketList|0x05|Player Look|pre=unchanged}}
+
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
{{PacketList|0x06|Player Position And Look|rel=Player Position And Look 2|pre=unchanged}}
+
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
{{PacketList|0x07|Player Digging}}
+
{{PacketList|{{change|0x5B|0x5C}}|Tags|pre=unchanged}}
{{PacketList|0x08|Use Item|rel=added}}
 
{{PacketList|{{Change|0x08|0x09}}|Player Block Placement}}
 
{{PacketList|{{Change|0x09|0x0A}}|Held Item Change|rel=Held Item Change 2|pre=unchanged}}
 
{{PacketList|{{Change|0x0A|0x0B}}|Animation|rel=Animation 2}}
 
{{PacketList|{{Change|0x0B|0x0C}}|Entity Action}}
 
{{PacketList|{{Change|0x0C|0x0D}}|Steer Vehicle|pre=unchanged}}
 
{{PacketList|{{Change|0x0D|0x0E}}|Close Window|rel=Close Window 2|pre=unchanged}}
 
{{PacketList|{{Change|0x0E|0x0F}}|Click Window|pre=unchanged}}
 
{{PacketList|{{Change|0x0F|0x10}}|Confirm Transaction|rel=Confirm Transaction 2|pre=unchanged}}
 
{{PacketList|{{Change|0x10|0x11}}|Creative Inventory Action|pre=unchanged}}
 
{{PacketList|{{Change|0x11|0x12}}|Enchant Item|pre=unchanged}}
 
{{PacketList|{{Change|0x12|0x13}}|Update Sign|rel=Update Sign 2}}
 
{{PacketList|{{Change|0x13|0x14}}|Player Abilities|rel=Player Abilities 2|pre=unchanged}}
 
{{PacketList|{{Change|0x14|0x15}}|Tab-Complete|rel=Tab-Complete 2|pre=unchanged}}
 
{{PacketList|{{Change|0x15|0x16}}|Client Settings}}
 
{{PacketList|{{Change|0x16|0x17}}|Client Status}}
 
{{PacketList|{{Change|0x17|0x18}}|Plugin Message|rel=Plugin Message 2|pre=unchanged}}
 
{{PacketList|{{Change|0x18|0x19}}|Spectate|pre=unchanged}}
 
{{PacketList|{{Change|0x19|0x1A}}|Resource Pack Status|pre=unchanged}}
 
|-
 
! colspan=4 | Status clientbound
 
{{PacketList|0x00|Response|pre=unchanged}}
 
{{PacketList|0x01|Pong|pre=unchanged}}
 
|-
 
! colspan=4 | Status serverbound
 
{{PacketList|0x00|Request|pre=unchanged}}
 
{{PacketList|0x01|Ping|pre=unchanged}}
 
|-
 
! colspan=4 | Login clientbound
 
{{PacketList|0x00|Disconnect|rel=Disconnect 2|pre=unchanged}}
 
{{PacketList|0x01|Encryption Request|pre=unchanged}}
 
{{PacketList|0x02|Login Success|pre=unchanged}}
 
{{PacketList|0x03|Set Compression|rel=Set Compression 2|pre=unchanged}}
 
|-
 
! colspan=4 | Login serverbound
 
{{PacketList|0x00|Login Start|pre=unchanged}}
 
{{PacketList|0x01|Encryption Response|pre=unchanged}}
 
 
  |}
 
  |}
  
 
== New/modified data types ==
 
== New/modified data types ==
  
=== Chunk Section ===
+
No changes so far.
  
Format is now:
+
== Entity Metadata ==
  
{| class="wikitable"
+
{{#vardefine:meta_prerelease|1}}{{warning2|Lots of shifts, of course}}
|-
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| Bits Per Block
 
| Unsigned Byte
 
| How many bits per block in Data Array. If 0, the Palette Length and Palette fields are omitted and the global palette (with 13 bits per block) is used.
 
|-
 
| Palette Length
 
| Optional VarInt
 
| Length of the following array
 
|-
 
| Palette
 
| Optional Array of VarInt
 
| Mapping of block state IDs in the {{Minecraft Wiki|Data values#Block IDs|global palette}} (<code>type = x >> 4</code>, <code>meta = x & 15</code>) to indices of this array
 
|-
 
| Data Array Length
 
| VarInt
 
| Number of bytes in the following array, divided by 8 (given as such because Notchian implements Data Array as an Array of Long)
 
|-
 
| Data Array
 
| Byte Array
 
| List of 4096 indices pointing to state IDs in the Palette, followed by padding to round the length up to the next multiple of 8 bytes
 
|-
 
| Block Light
 
| Byte Array
 
| Half byte per block
 
|-
 
| Sky Light
 
| Optional Byte Array
 
| Only if in the Overworld; half byte per block
 
|}
 
 
 
Data Array, Block Light, and Sky Light are given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates.
 
  
=== Entity Metadata ===
+
=== Living ===
  
Format is now an array of entries, each of which looks like the following:
+
{{Metadata inherit|Living|inherits=Entity|start_at=7}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Name
+
  ! Index
 
  ! Type
 
  ! Type
  ! Meaning
+
  !style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Index
+
  |rowspan="5"| {{Metadata id|}}
  | Unsigned Byte
+
  |rowspan="5"| Byte
  | Unique index key determining the meaning of the following value, see the table below. If this is <code>0xff</code> then the it is the end of the Entity Metadata array and no more is read.
+
  |colspan="2"| Hand states, used to trigger blocking/eating/drinking animation.
 +
|rowspan="5"| 0
 
  |-
 
  |-
  | Type
+
  ! Bit mask
  | Optional Byte Enum
+
  ! Meaning
| Only if Index is not <code>0xff</code>; the type of the index, see the table below
 
 
  |-
 
  |-
  | Value
+
  | 0x01
  | Optional ''value of Type''
+
  | Is hand active
| Only if Index is not <code>0xff</code>: the value of the metadata field
 
|}
 
 
 
{| class="wikitable"
 
! Value of Type field
 
! Type of Value field
 
! Notes
 
 
  |-
 
  |-
  | 0
+
  | 0x02
| Byte
+
  | Active hand (0 = main hand, 1 = offhand)
  |  
 
 
  |-
 
  |-
  | 1
+
  | 0x04
| VarInt
+
  | In riptide spin attack
  |  
 
 
  |-
 
  |-
  | 2
+
  | {{Metadata id|}}
 
  | Float
 
  | Float
  |  
+
  |colspan="2"| Health
 +
| 1.0
 
  |-
 
  |-
  | 3
+
  | {{Metadata id|}}
  | String
+
  | VarInt
  |  
+
|colspan="2"| Potion effect color (or 0 if there is no effect)
 +
  | 0
 
  |-
 
  |-
  | 4
+
  | {{Metadata id|}}
| [[Chat]]
 
|
 
|-
 
| 5
 
| [[Slot]]
 
|
 
|-
 
| 6
 
 
  | Boolean
 
  | Boolean
  |  
+
  |colspan="2"| Is potion effect ambient: reduces the number of particles generated by potions to 1/5 the normal amount
 +
| false
 
  |-
 
  |-
  | 7
+
  | {{Metadata id|}}
  | Vector3F (Array of Float)
+
| VarInt
  | 3 elements
+
  |colspan="2"| Number of arrows in entity
  |-  
+
  | 0
  | 8
+
  |- {{Added}}
  | Position
+
| {{Metadata id|added}}
  |  
+
  | VarInt
 +
  |colspan="2"| Health added by absorption (based on the AbsorptionAmount tag)
 +
  | 0
 
  |-
 
  |-
  | 9
+
  | {{Metadata id|}}
| OptPosition (Boolean + Optional Position)
+
  | OptBlockPos
| Position is present if the Boolean is set to true
+
  |colspan="2"| Sleeping location (from SleepingX, SleepingY, SleepingZ tags)
|-
+
  | Absent
  | 10
 
  | Direction (VarInt)
 
| ???
 
|-
 
| 11
 
| OptUUID (Boolean + Optional UUID)
 
  | UUID is present if the Boolean is set to true
 
 
  |}
 
  |}
  
{| class="wikitable"
+
=== Bee ===
! Entity class
+
 
 +
{{Metadata inherit|Bee|inherits=Insentient|start_at=16}}
 +
 
 +
{| class="wikitable" {{added}}
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
  ! Meaning
+
  !style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  |rowspan="5"| Entity
+
  |rowspan="5"| {{Metadata id|}}
  | 0
+
  |rowspan="5"| Byte
  | Byte
+
  |colspan="2"| Flags
  | ''Unknown''
+
  |rowspan="5"| 0
 
  |-
 
  |-
  | 1
+
  | 0x01 || ''Unused''
| VarInt
 
| ''Unknown''
 
 
  |-
 
  |-
  | 2
+
  | 0x02 || Is angry
| String
 
| ''Unknown''
 
 
  |-
 
  |-
  | 3
+
  | 0x04 || Has stung
| Boolean
 
| ''Unknown''
 
 
  |-
 
  |-
  | 4
+
  | 0x08 || Has nectar
| Boolean
 
| ''Unknown''
 
 
  |-
 
  |-
  |rowspan="4"| AreaEffectCloud <sup>extends Entity</sup>
+
  | {{Metadata id|}}
| 5
 
| Float
 
| ''Unknown''
 
|-
 
| 6
 
 
  | VarInt
 
  | VarInt
  | ''Unknown''
+
  | colspan="2"| Anger time in ticks
|-
+
  | 0 (Not angry)
| 7
+
  |}
| Boolean
+
 
| ''Unknown''
+
=== Wolf ===
|-
+
 
| 8
+
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=17|pre_start_at=18}}
| VarInt
+
 
| ''Unknown''
+
{| class="wikitable"
|-
+
  ! Index
| Arrow <sup>extends Entity</sup>
+
  ! Type
| 5
+
  !style="width: 250px;" colspan="2"| Meaning
| Byte
+
  ! Default
| ''Unknown''
+
  |- {{removed}}
|-
+
  | {{Metadata id|removed}}
| TippedArrow <sup>extends Arrow</sup>
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="3"| Boat <sup>extends Entity</sup>
 
  | 5
 
  | VarInt
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| 7
 
| Float
 
| ''Unknown''
 
|-
 
| EnderCrystal <sup>extends Entity</sup>
 
| 5
 
| OptPosition
 
| ''Unknown''
 
|-
 
| Fireball <sup>extends Entity</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| WitherSkull <sup>extends Fireball</sup>
 
| 5
 
| Boolean
 
| ''Unknown''
 
|-
 
| Fireworks <sup>extends Entity</sup>
 
| 5
 
| [[Slot]]
 
| ''Unknown''
 
|-
 
| Hanging <sup>extends Entity</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
|rowspan="2"| ItemFrame <sup>extends Hanging</sup>
 
| 5
 
| [[Slot]]
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| Item <sup>extends Entity</sup>
 
| 5
 
| [[Slot]]
 
| ''Unknown''
 
|-
 
|rowspan="5"| Living <sup>extends Entity</sup>
 
| 5
 
| Byte
 
| ''Unknown''
 
|-
 
| 6
 
| Float
 
| ''Unknown''
 
|-
 
| 7
 
| VarInt
 
| ''Unknown''
 
|-
 
| 8
 
| Boolean
 
| ''Unknown''
 
|-
 
| 9
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="7"| ArmorStand <sup>extends Living</sup>
 
| 10
 
| Byte
 
| ''Unknown''
 
|-
 
| 11
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 12
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 13
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 14
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 15
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 16
 
| Vector3F
 
| ''Unknown''
 
|-
 
| Insentient <sup>extends Living</sup>
 
| 10
 
| Byte
 
| ''Unknown''
 
|-
 
| Ambient <sup>extends Insentient</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| Bat <sup>extends Ambient</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
  |-
 
  | Creature <sup>extends Insentient</sup>
 
  |colspan="3"| ''no additional metadata''
 
|-
 
| Ageable <sup>extends Creature</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| Animal <sup>extends Ageable</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
|rowspan="5"| Horse <sup>extends Animal</sup>
 
| 12
 
| Byte
 
| ''Unknown''
 
|-
 
| 13
 
| VarInt
 
| ''Unknown''
 
|-
 
| 14
 
| VarInt
 
| ''Unknown''
 
|-
 
| 15
 
| OptUUID
 
| ''Unknown''
 
|-
 
| 16
 
| VarInt
 
| ''Unknown''
 
|-
 
| Pig <sup>extends Animal</sup>
 
| 12
 
| Boolean
 
| ''Unknown''
 
|-
 
| Rabbit <sup>extends Animal</sup>
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
| Sheep <sup>extends Animal</sup>
 
| 12
 
| Byte
 
| ''Unknown''
 
|-
 
|rowspan="2"| TameableAnimal <sup>extends Animal</sup>
 
| 12
 
  | Byte
 
| ''Unknown''
 
|-
 
| 13
 
| OptUUID
 
| ''Unknown''
 
  |-
 
  | Ocelot <sup>extends TameableAnimal</sup>
 
| 14
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="3"| Wolf <sup>extends TameableAnimal</sup>
 
| 14
 
 
  | Float
 
  | Float
  | ''Unknown''
+
  |colspan="2"| Damage taken (used for tail rotation)
 +
| Value of health field (1.0)
 
  |-
 
  |-
  | 15
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  | ''Unknown''
+
  |colspan="2"| Is begging
 +
| false
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
 
  | VarInt
 
  | VarInt
| ''Unknown''
+
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
|-
+
  | 14 (Red)
| Villager <sup>extends Ageable</sup>
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
| Golem <sup>extends Creature</sup>
 
  |colspan="3"| ''no additional metadata''
 
|-
 
| IronGolem <sup>extends Golem</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
|rowspan="3"| Shulker <sup>extends Golem</sup>
 
| 11
 
| Direction
 
| ''Unknown''
 
|-
 
| 12
 
| OptPosition
 
| ''Unknown''
 
|-
 
| 13
 
| Byte
 
| ''Unknown''
 
|-
 
| Monster <sup>extends Creature</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| Blaze <sup>extends Monster</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
|rowspan="3"| Creeper <sup>extends Monster</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| 12
 
| Boolean
 
| ''Unknown''
 
|-
 
| 13
 
| Boolean
 
| ''Unknown''
 
|-
 
|rowspan="2"| Guardian <sup>extends Monster</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="2"| Skeleton <sup>extends Monster</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| 12
 
| Boolean
 
| ''Unknown''
 
|-
 
| Spider <sup>extends Monster</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
| Witch <sup>extends Monster</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
|rowspan="4"| Wither <sup>extends Monster</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
| 13
 
| VarInt
 
| ''Unknown''
 
|-
 
  | 14
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="3"| Zombie <sup>extends Monster</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| 12
 
| Boolean
 
| ''Unknown''
 
|-
 
| 13
 
| Boolean
 
| ''Unknown''
 
|-
 
| EnderDragon <sup>extends Insentient</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| Flying <sup>extends Insentient</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| Ghast <sup>extends Flying</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| Slime <sup>extends Insentient</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="6"| Minecart <sup>extends Entity</sup>
 
| 5
 
| VarInt
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| 7
 
| Float
 
| ''Unknown''
 
|-
 
| 8
 
| VarInt
 
| ''Unknown''
 
|-
 
| 9
 
| VarInt
 
| ''Unknown''
 
|-
 
| 10
 
| Boolean
 
| ''Unknown''
 
|-
 
|rowspan="2"| MinecartCommandBlock <sup>extends Minecart</sup>
 
| 11
 
| String
 
| ''Unknown''
 
|-
 
| 12
 
| [[Chat]]
 
| ''Unknown''
 
|-
 
| MinecartFurnace <sup>extends Minecart</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| TNTPrimed <sup>extends Entity</sup>
 
| 5
 
| VarInt
 
| ''Unknown''
 
 
  |}
 
  |}
  
Entity classes also recursively use fields from classes they extend.
+
=== Enderman ===
 
 
== Handshaking ==
 
 
 
=== Clientbound ===
 
  
No changes so far.
+
{{Metadata inherit|Wolf|inherits=Monster|start_at=14|pre_start_at=15}}
 
 
=== Serverbound ===
 
 
 
==== Handshake ====
 
 
 
This causes the server to switch into the target state.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x00
+
  | {{Metadata id|}}
  |rowspan="4"| Handshaking
+
  | Opt BlockID
  |rowspan="4"| Server
+
  |colspan="2"| Carried block
  | Protocol Version
+
  | Absent
| VarInt
 
| See [[protocol version numbers]] (currently {{Change|47|70}})
 
 
  |-
 
  |-
  | Server Address
+
  | {{Metadata id|}}
  | String
+
  | Boolean
  | hostname or IP, e.g. localhost or 127.0.0.1<!-- does this support IPv6? -->
+
  |colspan="2"| Is screaming
  |-
+
  | false
  | Server Port
+
  |- {{added}}
  | Unsigned Short
+
  | {{Metadata id|added}}
| default is 25565
+
  | Boolean
  |-
+
  |colspan="2"| Is stared at
  | Next State
+
  | false
| VarInt Enum
 
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
 
 
  |}
 
  |}
  
== Play ==
+
=== Trident ===
  
=== Clientbound ===
+
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=10}}
 
 
==== Entity Equipment ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x04
+
  | {{Metadata id|}}
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | Entity's EID
+
  |colspan="2"| Loyalty level (enchantment)
|-
+
  | 0
  | Slot
+
  |- {{Added}}
  | {{Change|Short|VarInt}} Enum
+
  | {{Metadata id|}}
  | Equipment slot. 0: main hand, {{Change||1: off hand}}, {{Change|1–4|2–5}}: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
+
  | Boolean
  |-
+
  |colspan="2"| Has enchantment glint
  | Item
+
  | False
| [[Slot Data|Slot]]
 
  |  
 
 
  |}
 
  |}
  
==== Spawn Player ====
+
== Block Actions ==
  
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
+
No changes so far.
  
This packet must be sent after the [[Protocol#Player List Item|Player List Item]] ([[#Play|Play]], 0x38, clientbound) packet that adds the player data for the client to use when spawning a player. If the Player List Item for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player List Item packet includes skin/cape data.
+
== Inventories ==
  
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
+
No changes so far.
  
When in online-mode the UUIDs must be valid and have valid skin blobs, in offline-mode UUID v3 is used.
+
== Plugin Channels ==
  
For NPCs UUID v2 should be used. Note:
+
No changes so far.
  
<+Grum> i will never confirm this as a feature you know that :)
+
== Play ==
 
 
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="9"| 0x0C
 
|rowspan="9"| Play
 
|rowspan="9"| Client
 
| Entity ID
 
| VarInt
 
| Player's EID
 
|-
 
| Player UUID
 
| UUID
 
|
 
|-
 
| X
 
| Int
 
| Player X as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Player Y as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Player Z as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Pitch
 
| Angle
 
|
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Current Item
 
| Short
 
| The item the player is currently holding. Note that this should be 0 for “no item”, unlike -1 used in other packets.
 
|-
 
| Metadata
 
| [[#Entity Metadata|Entity Metadata]]
 
|
 
|}
 
 
 
==== Spawn Object ====
 
 
 
Sent by the server when an object/vehicle is created.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="13"| 0x0E
 
|rowspan="13"| Play
 
|rowspan="13"| Client
 
| Entity ID
 
| VarInt
 
| EID of the object
 
|- style="background-color: #d9ead3;"
 
| Object UUID
 
| UUID
 
|
 
|-
 
| Type
 
| Byte
 
| The type of object (See [[Entities#Objects]])
 
|-
 
| X
 
| Int
 
| X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Yaw
 
| Angle
 
|
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Data
 
| [[Object Data]]
 
|
 
|-  style="background-color: #d9ead3;"
 
| Info
 
| Int
 
| Depends on Type; see [[Object Data#Meaning of int field]]
 
|-  style="background-color: #d9ead3;"
 
| Velocity X
 
| Short
 
|
 
|-  style="background-color: #d9ead3;"
 
| Velocity Y
 
| Short
 
|
 
|-  style="background-color: #d9ead3;"
 
| Velocity Z
 
| Short
 
 
|}
 
  
 +
=== Clientbound ===
 
==== Spawn Mob ====
 
==== Spawn Mob ====
  
Line 889: Line 306:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x0F
+
  |rowspan="13"| 0x03
 
  |rowspan="13"| Play
 
  |rowspan="13"| Play
 
  |rowspan="13"| Client
 
  |rowspan="13"| Client
Line 895: Line 312:
 
  | VarInt
 
  | VarInt
 
  |  
 
  |  
  |- style="background-color: #d9ead3;"
+
  |-
 
  | Entity UUID
 
  | Entity UUID
 
  | UUID
 
  | UUID
Line 901: Line 318:
 
  |-
 
  |-
 
  | Type
 
  | Type
  | Unsigned Byte
+
  | VarInt
 
  | The type of mob. See [[Entities#Mobs]]
 
  | The type of mob. See [[Entities#Mobs]]
 
  |-
 
  |-
 
  | X
 
  | X
  | Int
+
  | Double
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Y
 
  | Y
  | Int
+
  | Double
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Z
 
  | Z
  | Int
+
  | Double
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Yaw
 
  | Yaw
Line 930: Line 347:
 
  | Velocity X
 
  | Velocity X
 
  | Short
 
  | Short
  | Same units as [[Protocol#Entity Velocity|Entity Velocity]]
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
 
  | Velocity Y
 
  | Velocity Y
 
  | Short
 
  | Short
  | Same units as [[Protocol#Entity Velocity|Entity Velocity]]
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
 
  | Velocity Z
 
  | Velocity Z
 
  | Short
 
  | Short
  | Same units as [[Protocol#Entity Velocity|Entity Velocity]]
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
  |-
+
  |- {{removed}}
 
  | Metadata
 
  | Metadata
  | [[#Entity Metadata|Entity Metadata]]
+
  | [[Entities#Entity Metadata Format|Entity Metadata]]
 
  |  
 
  |  
 
  |}
 
  |}
  
==== Entity Status ====
+
==== Spawn Player ====
 +
 
 +
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
 +
 
 +
This packet must be sent after the [[#Player Info|Player Info]] packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.
 +
 
 +
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 955: Line 378:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x1A
+
  |rowspan="8"| 0x05
  |rowspan="2"| Play
+
  |rowspan="8"| Play
  |rowspan="2"| Client
+
  |rowspan="8"| Client
 
  | Entity ID
 
  | Entity ID
  | Int
+
  | VarInt
  |  
+
  | Player's EID
 
  |-
 
  |-
  | Entity Status
+
  | Player UUID
  | Byte Enum
+
  | UUID
  | See below
+
  | See below for notes on {{Minecraft Wiki|Server.properties#online-mode|offline mode}} and NPCs
|}
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
! Entity Status
+
  | X
! Meaning
+
  | Double
|-
 
| 1
 
| Sent when resetting a mob spawn minecart's timer — appears to be unused by the client
 
|-
 
| 2
 
  | Living Entity hurt
 
  |-
 
| 3
 
| Living Entity dead
 
|-
 
| 4
 
| Iron Golem throwing up arms
 
|-
 
| 6
 
| Wolf/Ocelot/Horse taming — Spawn “heart” particles
 
|-
 
| 7
 
| Wolf/Ocelot/Horse tamed — Spawn “smoke” particles
 
|-
 
| 8
 
| Wolf shaking water — Trigger the shaking animation
 
|-
 
| 9
 
| (of self) Eating accepted by server
 
|-
 
| 10
 
| Sheep eating grass
 
|-
 
| 10
 
| Play TNT ignite sound
 
|-
 
| 11
 
| Iron Golem handing over a rose
 
|-
 
| 12
 
| Villager mating — Spawn “heart” particles
 
|-
 
| 13
 
| Spawn particles indicating that a villager is angry and seeking revenge
 
|-
 
| 14
 
| Spawn happy particles near a villager
 
|-
 
| 15
 
| Witch animation — Spawn “magic” particles
 
|-
 
| 16
 
| Play zombie converting into a villager sound
 
|-
 
| 17
 
| Firework exploding
 
|-
 
| 18
 
| Animal in love (ready to mate) — Spawn “heart” particles
 
|-
 
| 19
 
| Reset squid rotation
 
|-
 
| 20
 
| Spawn explosion particle — works for some living entities
 
|-
 
| 21
 
| Play guardian sound — works for every entity
 
|-
 
| 22
 
| Enables reduced {{Minecraft Wiki|Debug screen|debug}} for players
 
|-
 
| 23
 
| Disables reduced {{Minecraft Wiki|Debug screen|debug}} for players
 
|- style="background-color: #d9ead3;"
 
| 24–28
 
| Sets {{Minecraft Wiki|Server.properties#op-permission-level|op permission level}} 0–4 for players
 
|}
 
 
 
==== Entity Properties ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="6"| 0x20
 
|rowspan="6"| Play
 
|rowspan="6"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
 
  |  
 
  |  
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  | Y
|colspan="2"| Int
 
| Number of elements in the following array
 
|-
 
|rowspan="4"| Property
 
| Key
 
|rowspan="4"| Array
 
| String
 
| See below
 
|-
 
| Value
 
 
  | Double
 
  | Double
| See below
 
|-
 
| Number Of Modifiers
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Modifiers
 
| Array of Modifier Data
 
| Modifier Data defined below
 
|}
 
 
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
 
 
{| class="wikitable"
 
|-
 
! Key
 
! Default
 
! Min
 
! Max
 
! Label
 
|-
 
| generic.maxHealth
 
| 20.0
 
| 0.0
 
| {{Change|Double.MaxValue|1024.0}}
 
| Max Health
 
|-
 
| generic.followRange
 
| 32.0
 
| 0.0
 
| 2048.0
 
| Follow Range
 
|-
 
| generic.knockbackResistance
 
| 0.0
 
| 0.0
 
| 1.0
 
| Knockback Resistance
 
|-
 
| generic.movementSpeed
 
| 0.699999988079071
 
| 0.0
 
| {{Change|Double.MaxValue|1024.0}}
 
| Movement Speed
 
|-
 
| generic.attackDamage
 
| 2.0
 
| 0.0
 
| {{Change|Double.MaxValue|2048.0}}
 
| {{Change||Attack Damage}}
 
|- style="background-color: #d9ead3;"
 
| generic.attackSpeed
 
| 4.0
 
| 0.0
 
| 1024.0
 
| Attack Speed
 
|-
 
| horse.jumpStrength
 
| 0.7
 
| 0.0
 
| 2.0
 
| Jump Strength
 
|-
 
| zombie.spawnReinforcements
 
| 0.0
 
| 0.0
 
| 1.0
 
| Spawn Reinforcements Chance
 
|}
 
 
''Modifier Data'' structure:
 
 
{| class="wikitable"
 
|-
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| UUID
 
| UUID
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Amount
+
  | Z
 
  | Double
 
  | Double
 
  |  
 
  |  
 
  |-
 
  |-
  | Operation
+
  | Yaw
  | Byte
+
  | Angle
 
  |  
 
  |  
|}
 
 
==== Chunk Data ====
 
 
Chunk pillars are not unloaded by the client automatically. To unload chunk pillars, {{Change|send this packet with Ground-Up Continuous{{=}}true and no 16^3 chunks (eg. Primary Bit Mask{{=}}0)|send an [[#Unload Chunk|Unload Chunk]] packet with the chunk's X and Z coordinates}}. The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="7"| 0x21
+
  | Pitch
|rowspan="7"| Play
+
  | Angle
|rowspan="7"| Client
+
  |  
| Chunk X
+
  |- {{removed}}
| Int
+
  | Metadata
| Chunk X coordinate
+
  | [[Entities#Entity Metadata Format|Entity Metadata]]
|-
 
| Chunk Z
 
| Int
 
| Chunk Z coordinate
 
|-
 
  | Ground-Up Continuous
 
  | Boolean
 
| This is true if the packet represents all chunk sections in this vertical chunk column, where the Primary Bit Mask specifies exactly which chunk sections are included, and which are air.
 
  |-
 
| Primary Bit Mask
 
| {{Change|Unsigned Short|VarInt}}
 
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data follows in the compressed data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
 
|-
 
| Size
 
  | VarInt
 
| Size of Data in bytes
 
|-
 
| Data
 
| Array of [[#Chunk Section|Chunk Section]]
 
| The length of the array is equal to the number of bits set in Primary Bit Mask.
 
|-
 
| Biomes
 
| Optional Byte Array
 
| Only if Ground-Up Continuous: biome array, byte per XZ coordinate, 256 bytes total.
 
|}
 
 
 
==== {{Change||Unload Chunk}} ====
 
 
 
Tells the client to unload a chunk.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x22
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Chunk X
 
| Int
 
| Chunk X coordinate
 
|-
 
| Chunk Z
 
| Int
 
| Chunk Z coordinate
 
|}
 
 
 
==== Multi Block Change ====
 
 
 
Fired whenever 2 or more blocks are changed within the render distance.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="6"| {{Change|0x22|0x23}}
 
|rowspan="6"| Play
 
|rowspan="6"| Client
 
|colspan="2"| Chunk X
 
|colspan="2"| Int
 
| Chunk X coordinate
 
|-
 
|colspan="2"| Chunk Z
 
|colspan="2"| Int
 
| Chunk Z coordinate
 
|-
 
|colspan="2"| Record Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array, i.e. the number of blocks affected
 
|-
 
|rowspan="3"| Record
 
| Horizontal Position
 
|rowspan="3"| Array
 
| Unsigned Byte
 
| The 4 most significant bits (<code>0xF0</code>) encode the X coordinate, relative to the chunk. The 4 least significant bits (<code>0x0F</code>) encode the Z coordinate, relative to the chunk.
 
|-
 
| Y Coordinate
 
| Unsigned Byte
 
 
  |  
 
  |  
|-
 
| Block ID
 
| VarInt
 
| The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}} (<code>type = x >> 4</code>, <code>meta = x & 15</code>)
 
 
  |}
 
  |}
  
==== Block Change ====
+
When in {{Minecraft Wiki|Server.properties#online-mode|online mode}}, the UUIDs must be valid and have valid skin blobs.
  
Fired whenever a block is changed within the render distance.
+
In offline mode, [[Wikipedia:Universally unique identifier#Versions 3 and 5 (namespace name-based)|UUID v3]] is used with the String <code>OfflinePlayer:&lt;player name&gt;</code>, encoded in UTF-8 (and case-sensitive).
  
{| class="wikitable"
+
For NPCs UUID v2 should be used. Note:
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| {{Change|0x23|0x24}}
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Location
 
| Position
 
| Block Coordinates
 
|-
 
| Block ID
 
| VarInt
 
| The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}} (<code>type = x >> 4</code>, <code>meta = x & 15</code>)
 
|}
 
  
==== Block Action ====
+
<+Grum> i will never confirm this as a feature you know that :)
  
This packet is used for a number of things:
+
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
  
* Chests opening and closing
+
==== Update Block Entity ====
* Pistons pushing and pulling
 
* Note blocks playing
 
* Updating beacons
 
  
See also: [[Block Actions]]
+
Sets the block entity associated with the block at the given location.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,318: Line 436:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
|rowspan="4"| {{Change|0x24|0x25}}
+
  |rowspan="3"| {{change|0x09|0x0A}}
|rowspan="4"| Play
 
|rowspan="4"| Client
 
| Location
 
| Position
 
| Block coordinates
 
|-
 
| Byte 1
 
| Unsigned Byte
 
| Varies depending on block — see [[Block Actions]]
 
|-
 
| Byte 2
 
| Unsigned Byte
 
| Varies depending on block — see [[Block Actions]]
 
|-
 
| Block Type
 
| VarInt
 
|
 
|}
 
 
 
==== Block Break Animation ====
 
 
 
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
 
 
 
You can also set an animation to air! The animation will still be visible.
 
 
 
If you need to display several break animations at the same time you have to give each of them a unique Entity ID.
 
 
 
Also if you set the coordinates to a special block like water etc. it won't show the actual break animation but some other interesting effects. For example, water will lose its transparency.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
  |rowspan="3"| {{Change|0x25|0x26}}
 
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
| Entity ID
 
| VarInt
 
| EID for the animation
 
|-
 
 
  | Location
 
  | Location
 
  | Position
 
  | Position
| Block Position
 
|-
 
| Destroy Stage
 
| Byte
 
| 0–9 to set it, any other value to remove it
 
|}
 
 
==== {{Change|Map Chunk Bulk|}} ====
 
 
Replaced by multiple [[#Chunk Data|Chunk Data]] packets.
 
 
==== Map ====
 
 
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="13"| 0x34
 
|rowspan="13"| Play
 
|rowspan="13"| Client
 
|colspan="2"| Item Damage
 
|colspan="2"| VarInt
 
| The damage value (map ID) of the map being modified
 
|-
 
|colspan="2"| Scale
 
|colspan="2"| Byte
 
| From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 
|- style="background-color: #d9ead3;"
 
|colspan="2" | Tracking Position
 
|colspan="2" | Boolean
 
| Specifies whether the icons are shown
 
|-
 
|colspan="2"| Icon Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
|-
 
|rowspan="3"| Icon
 
| Direction And Type
 
|rowspan="3"| Array
 
| Byte
 
| 0xF0 = Direction, 0x0F = Type
 
|-
 
| X
 
| Byte
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Z
+
  | Action
  | Byte
+
  | Unsigned Byte
  |  
+
  | The type of update to perform, see below
|-
 
|colspan="2"| Columns
 
|colspan="2"| Byte
 
| Number of columns updated
 
 
  |-
 
  |-
  |colspan="2"| Rows
+
  | NBT Data
  |colspan="2"| Optional Byte
+
  | [[NBT|NBT Tag]]
  | Only if Columns is more than 0; number of rows updated
+
  | Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)
|-
 
  |colspan="2"| X
 
|colspan="2"| Optional Byte
 
| Only if Columns is more than 0; x offset of the westernmost column
 
|-
 
|colspan="2"| Z
 
|colspan="2"| Optional Byte
 
| Only if Columns is more than 0; z offset of the northernmost row
 
|-
 
|colspan="2"| Length
 
|colspan="2"| Optional VarInt
 
| Only if Columns is more than 0; length of the following array
 
|-
 
|colspan="2"| Data
 
|colspan="2"| Optional Array of Byte Enum
 
| Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 
 
  |}
 
  |}
  
==== Teams ====
+
''Action'' field:
  
Creates and updates teams.
+
* '''1''': Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
 +
* '''2''': Set command block text (command and last execution status)
 +
* '''3''': Set the level, primary, and secondary powers of a beacon
 +
* '''4''': Set rotation and skin of mob head
 +
* '''5''': Declare a conduit
 +
* '''6''': Set base color and patterns on a banner
 +
* '''7''': Set the data for a Structure tile entity
 +
* '''8''': Set the destination for a end gateway
 +
* '''9''': Set the text on a sign
 +
* '''10''': Unused
 +
* '''11''': Declare a bed
 +
* '''12''': Set data of a jigsaw block
 +
* '''13''': Set items in a campfire
 +
* {{change||'''14''': Beehive information}}
  
{| class="wikitable"
+
==== Change Game State ====
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="11"| 0x3E
 
|rowspan="11"| Play
 
|rowspan="11"| Client
 
| Team Name
 
| String
 
| A unique name for the team. (Shared with scoreboard).
 
|-
 
| Mode
 
| Byte Enum
 
| 0: create team, 1: remove team, 2: update team info; 3: add players to team; 4: remove players from team
 
|-
 
| Team Display Name
 
| Optional String
 
| Only if Mode is 0 or 2.
 
|-
 
| Team Prefix
 
| Optional String
 
| Only if Mode is 0 or 2. Displayed before the players' name that are part of this team.
 
|-
 
| Team Suffix
 
| Optional String
 
| Only if Mode is 0 or 2. Displayed after the players' name that are part of this team.
 
|-
 
| Friendly Fire
 
| Optional Byte
 
| Only if Mode is 0 or 2. 0 for off, 1 for on, 3 for seeing friendly invisibles.
 
|-
 
| Name Tag Visibility
 
| Optional String
 
| Only if Mode is 0 or 2. <code>always</code>, <code>hideForOtherTeams</code>, <code>hideForOwnTeam</code>, <code>never</code>.
 
|- style="background-color: #d9ead3;"
 
| Collision Rule
 
| Optional String
 
| Only if Mode is 0 or 2. <code>always</code>, <code>hideForOtherTeams</code> ''(sic)'', <code>hideForOwnTeam</code> ''(sic)'', <code>never</code>
 
|-
 
| Color
 
| Optional Byte
 
| Only if Mode is 0 or 2. Same as [[Chat]] colors.
 
|-
 
| Player Count
 
| Optional VarInt
 
| Only if Mode is 0 or 3 or 4. Number of players in the array.
 
|-
 
| Players
 
| Optional Array of String
 
| Only if Mode is 0 or 3 or 4. Players to be added/remove from the team. Max 40 characters so may be uuid's later.
 
|}
 
  
==== Combat Event ====
+
Used for a wide variety of game state things, from whether to bed use to gamemode to demo messages.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,512: Line 477:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
!colspan="2"| Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="8"| 0x42
 
|rowspan="8"| Play
 
|rowspan="8"| Client
 
|colspan="2"| Event
 
| VarInt Enum
 
| Determines the layout of the remaining packet
 
|-
 
! Event
 
 
  ! Field Name
 
  ! Field Name
!
 
!
 
|-
 
| 0: enter combat
 
| ''no fields''
 
| ''no fields''
 
|
 
|-
 
|rowspan="2"| 1: end combat
 
| Duration
 
| VarInt
 
|
 
|-
 
| Entity ID
 
| Int
 
|
 
|-
 
|rowspan="3"| 2: entity dead
 
| Player ID
 
| VarInt
 
|
 
|-
 
| Entity ID
 
| Int
 
|
 
|-
 
| Message
 
| {{Change|String|[[Chat]]}}
 
|
 
|}
 
 
==== {{Change|Update Entity NBT|}} ====
 
 
Was only used to update boss bars, replaced by [[#Boss Bar|Boss Bar]] accordingly.
 
 
==== {{Change||Boss Bar}} ====
 
 
This packet replaces Update Entity NBT packet which has been removed.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="15"| 0x49
+
  |rowspan="2"| 0x1F
  |rowspan="15"| Play
+
  |rowspan="2"| Play
  |rowspan="15"| Client
+
  |rowspan="2"| Client
  |colspan="2"| UUID
+
  | Reason
| UUID
 
| Unique ID for this bar
 
|-
 
|colspan="2"| Action
 
| VarInt Enum
 
| Determines the layout of the remaining packet
 
|-
 
! Action
 
! Field Name
 
!
 
!
 
|-
 
|rowspan="5"| 0: add
 
| Title
 
| [[Chat]]
 
|
 
|-
 
| Health
 
| Float
 
| From 0 to 1. Values greater than 1 do not crash the client, and start [https://i.johni0702.de/nA.png rendering part of a second health bar] at around 1.5.
 
|-
 
| Color
 
| VarInt
 
| Color ID (see below)
 
|-
 
| Dividers
 
| VarInt
 
| Number of dividers rendered in the bar
 
|-
 
| Flags
 
 
  | Unsigned Byte
 
  | Unsigned Byte
  | Bit mask: 0x1 should darken sky, 0x2: is dragon bar
+
  | See below
 
  |-
 
  |-
  | 1: remove
+
  | Value
| ''no fields''
 
| ''no fields''
 
| Removes this boss bar
 
|-
 
| 2: update health
 
| Health
 
 
  | Float
 
  | Float
  | as above
+
  | Depends on Reason
|-
 
| 3: update title
 
| Title
 
| [[Chat]]
 
|
 
|-
 
|rowspan="2"| 4: update style
 
| Color
 
| VarInt Enum
 
| Color ID (see below)
 
|-
 
| Dividers
 
| VarInt
 
| as above
 
|-
 
| 5: update flags
 
| Flags
 
| Unsigned Byte
 
| as above
 
|-
 
 
  |}
 
  |}
  
{| class="wikitable"
+
''Reason codes'':
! ID
 
! Color
 
|-
 
| 0
 
| Pink(ish)
 
|-
 
| 1
 
| Cyan
 
|-
 
| 2
 
| Red
 
|-
 
| 3
 
| Lime
 
|-
 
| 4
 
| Yellow
 
|-
 
| 5
 
| Purple
 
|-
 
| 6
 
| White
 
|}
 
 
 
==== {{Change||Set Cooldown}} ====
 
 
 
Applies a cooldown period to an item type.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x4A
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Item ID
 
| VarInt
 
| ID of the item to apply a cooldown to.
 
|-
 
| Cooldown Ticks
 
| VarInt
 
| Number of ticks to apply a cooldown for.
 
|}
 
 
 
=== Serverbound ===
 
 
 
==== Use Entity ====
 
 
 
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
 
 
 
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
 
 
 
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="6"| 0x02
 
|rowspan="6"| Play
 
|rowspan="6"| Server
 
| Target
 
| VarInt
 
|
 
|-
 
| Type
 
| VarInt Enum
 
| 0: interact, 1: attack, 2: interact at
 
|-
 
| Target X
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Target Y
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Target Z
 
| Optional Float
 
| Only if Type is interact at
 
|- style="background-color: #d9ead3;"
 
| Hand
 
| Optional VarInt Enum
 
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
|}
 
 
 
==== Player Digging ====
 
 
 
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius of the player's position.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| 0x07
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Status
 
| Byte Enum
 
| The action the player is taking against the block (see below)
 
|-
 
| Location
 
| Position
 
| Block position
 
|-
 
| Face
 
| Byte Enum
 
| The face being hit (see below)
 
|}
 
 
 
Status can be one of seven values:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Reason
 +
! Effect
 
  ! Value
 
  ! Value
! Meaning
 
! Notes
 
 
  |-
 
  |-
 
  | 0
 
  | 0
  | Started digging
+
  | Invalid Bed
  |  
+
  | Would be used to switch between messages, but the only used message is 0 for invalid bed
 
  |-
 
  |-
 
  | 1
 
  | 1
  | Cancelled digging
+
  | End raining
  | Sent when the player lets go of the Mine Block key (default: left click)
+
  |  
 
  |-
 
  |-
 
  | 2
 
  | 2
  | Finished digging
+
  | Begin raining
  | Sent when the client thinks it is finished
+
  |  
 
  |-
 
  |-
 
  | 3
 
  | 3
  | Drop item stack
+
  | Change gamemode
  | Triggered by using the Drop Item key (default: Q) with the modifier to drop the entire selected stack (default: depends on OS). Location is always set to 0/0/0, Face is always set to -Y.
+
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
 
  |-
 
  |-
 
  | 4
 
  | 4
  | Drop item
+
  | Exit end
  | Triggered by using the Drop Item key (default: Q). Location is always set to 0/0/0, Face is always set to -Y.
+
  | 0: Immediately send Client Status of respawn without showing end credits; 1: Show end credits and respawn at the end (or when esc is pressed). 1 is sent if the player has not yet received the "The end?" advancement, while if they do have it 0 is used.
 
  |-
 
  |-
 
  | 5
 
  | 5
  | Shoot arrow / finish eating
+
  | Demo message
  | Location is always set to 0/0/0, Face is always set to Special.
+
  | 0: Show welcome to demo screen, 101: Tell movement controls, 102: Tell jump control, 103: Tell inventory control
  |- style="background-color: #d9ead3;"
+
  |-  
 
  | 6
 
  | 6
  | Swap item in hand
+
  | Arrow hitting player
  | Used to swap or assign an item to the second hand. Location is always set to 0/0/0, Face is always set to -Y.
+
  | Appears to be played when an arrow strikes another player in Multiplayer
|}
 
 
 
The Face field can be one of the following values, representing the face being hit (or the Special value used for “shoot arrow / finish eating”):
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Value
+
  | 7
  ! Offset
+
  | Fade value
  ! Face
+
  | The current darkness value. 1 = Dark, 0 = Bright, Setting the value higher causes the game to change color and freeze
 
  |-
 
  |-
  | 0
+
  | 8
  | -Y
+
  | Fade time
  | Bottom
+
  | Time in ticks for the sky to fade
 
  |-
 
  |-
  | 1
+
  | 9
  | +Y
+
  | Play pufferfish sting sound
| Top
 
 
  |-
 
  |-
  | 2
+
  | 10
  | -Z
+
  | Play elder guardian mob appearance (effect and sound)
| North
+
  |- {{Added}}
|-
+
  | 11
| 3
+
  | Enable respawn screen
| +Z
+
  | 0: Enable respawn screen, 1: Immediately respawn (sent when the doImmediateRespawn gamerule changes)
| South
 
|-
 
| 4
 
| -X
 
| West
 
|-
 
| 5
 
| +X
 
| East
 
  |-
 
  | 255
 
  |
 
  | Special
 
 
  |}
 
  |}
  
==== {{Change||Use Item}} ====
+
==== Chunk Data ====
 +
{{Main|Chunk Format}}
 +
{{See also|#Unload Chunk}}
  
Sent when pressing the Use Item key (default: right click) with an item in hand.
+
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| 0x08
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Hand
 
| VarInt Enum
 
| Hand used for the animation
 
|}
 
  
==== Player Block Placement ====
+
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
  
 
{| class="wikitable"
 
{| class="wikitable"
|-
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,868: Line 563:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| {{Change|0x08|0x09}}
+
  |rowspan="10"| {{change|0x21|0x22}}
  |rowspan="7"| Play
+
  |rowspan="10"| Play
  |rowspan="7"| Server
+
  |rowspan="10"| Client
  | Location
+
  | Chunk X
  | Position
+
  | Int
  | Block position
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | Face
+
  | Chunk Z
  | {{Change|Byte|VarInt}} Enum
+
  | Int
  | The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Held Item
 
| [[Slot Data|Slot]]
 
|
 
|- style="background-color: #d9ead3;"
 
| Hand
 
| VarInt Enum
 
| The hand from which the block is placed; 0: main hand, 1: off hand
 
 
  |-
 
  |-
  | Cursor Position X
+
  | Full chunk
  | Byte
+
  | Boolean
  | The position of the crosshair on the block
+
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  |-
 
  |-
  | Cursor Position Y
+
  | Primary Bit Mask
  | Byte
+
  | VarInt
  |  
+
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
 
  |-
 
  |-
  | Cursor Position Z
+
  | Heightmaps
  | Byte
+
  | [[NBT]]
  |  
+
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
|}
+
|- {{Added}}
 
+
  | Biomes
In normal operation (i.e. placing a block), this packet is sent once, with the values set normally.
+
  | Optional array of Integer
 
+
  | 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks. Not present if full chunk is false.
This packet has a special case where X, Y, Z, and Direction are all -1. (Note that Y is unsigned so set to 255.) This special packet indicates that the currently held item for the player should have its state updated such as eating food, pulling back bows, using buckets, etc.
 
 
 
Special note on using buckets: When using buckets, the Notchian client might send two packets: first a normal and then a special case. The first normal packet is sent when you're looking at a block (e.g. the water you want to scoop up). This normal packet does not appear to do anything with a Notchian server. The second, special case packet appears to perform the action — based on current position/orientation and with a distance check — it appears that buckets can only be used within a radius of 6 units.
 
 
 
==== Held Item Change ====
 
 
 
Sent when the player changes the slot selection.
 
 
 
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
  ! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x09|0x0A}}
+
  | Size
|rowspan="1"| Play
+
  | VarInt
|rowspan="1"| Server
+
  | Size of Data in bytes
  | Slot
 
  | Short
 
| The slot which the player has selected (0–8)
 
|}
 
 
 
==== Animation ====
 
 
 
Sent when the player's arm swings.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x0A|0x0B}}
+
  | Data
|rowspan="1"| Play
+
  | Byte array
|rowspan="1"| Server
+
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
|style="background-color: #d9ead3;"| Hand
 
  |style="background-color: #d9ead3;"| VarInt Enum
 
  |style="background-color: #d9ead3;"| Hand used for the animation
 
|}
 
 
 
==== Entity Action ====
 
 
 
Sent at least when crouching, leaving a bed, or sprinting. To send action animation to client use 0x28. The client will send this with Action ID = 3 when “Leave Bed” is clicked.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x0B|0x0C}}
+
  | Number of block entities
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | Player ID
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Action ID
+
  | Block entities
  | VarInt Enum
+
  | Array of [[NBT|NBT Tag]]
| The ID of the action, see below
+
  | All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.
|-
 
  | Jump Boost
 
  | VarInt
 
| Horse jump boost. Ranged from 0 to 100.
 
 
  |}
 
  |}
  
Action ID can be one of the following values:
+
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
  
{| class="wikitable"
+
{{Change||To get the biome at a coordinate, use <code>biomes[((y >> 2) & 63) << 4 {{!}} ((z >> 2) & 3) << 2 {{!}} ((x >> 2) & 3)]</code>}}
! ID
 
! Action
 
|-
 
| 0
 
| Crouch
 
|-
 
| 1
 
| Uncrouch
 
|-
 
| 2
 
| Leave bed
 
|-
 
| 3
 
| Start sprinting
 
|-
 
| 4
 
| Stop sprinting
 
|-
 
| 5
 
| Jump with horse
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| 6
 
| Open inventory
 
|}
 
  
“Open inventory” is now sent via the [[#Client Status|Client Status]] packet.
+
===== Data structure =====
  
==== Steer Vehicle ====
+
The data section of the packet contains most of the useful data for the chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
|rowspan="3"| {{Change|0x0C|0x0D}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Sideways
 
| Float
 
| Positive to the left of the player
 
|-
 
| Forward
 
| Float
 
| Positive forward
 
|-
 
| Flags
 
| Unsigned Byte
 
| Bit mask. 0x1: jump, 0x2: unmount
 
|}
 
 
==== Close Window ====
 
 
This packet is sent by the client when closing a window.
 
 
Notchian clients send a Close Window packet with Window ID 0 to close their inventory even though there is never an [[#Open Window|Open Window]] packet for the inventory.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | {{Change|0x0D|0x0E}}
+
  | Data
  |rowspan="1"| Play
+
| Array of [[Chunk Format#Chunk Section structure|Chunk Section]]
  |rowspan="1"| Server
+
  | The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
  | Window ID
+
  |- {{removed}}
  | Unsigned Byte
+
  | Biomes
  | This is the ID of the window that was closed. 0 for player inventory.
+
  | Optional Int Array
 +
  | Only sent if full chunk is true; 256 entries if present
 
  |}
 
  |}
  
==== Click Window ====
+
==== Particle ====
  
This packet is sent by the player when it clicks on a slot in a window.
+
Displays the named particle.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,064: Line 642:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x0E|0x0F}}
+
  |rowspan="11"| {{Change|0x23|0x24}}
  |rowspan="6"| Play
+
  |rowspan="11"| Play
  |rowspan="6"| Server
+
  |rowspan="11"| Client
  | Window ID
+
  | Particle ID
  | Unsigned Byte
+
  | Int
  | The ID of the window which was clicked. 0 for player inventory.
+
  | The particle ID listed in [[#Particle|the particle data type]].
 
  |-
 
  |-
  | Slot
+
  | Long Distance
  | Short
+
  | Boolean
  | The clicked slot number, see below
+
  | If true, particle distance increases from 256 to 65536
 
  |-
 
  |-
  | Button
+
  | X
  | Byte
+
  | {{Change|Float|Double}}
  | The button used in the click, see below
+
  | X position of the particle
 
  |-
 
  |-
  | Action Number
+
  | Y
  | Short
+
  | {{Change|Float|Double}}
  | A unique number for the action, implemented by Notchian as a counter, starting at 1. Used by the server to send back a [[Protocol#Confirm Transaction|Confirm Transaction]].
+
  | Y position of the particle
 
  |-
 
  |-
  | Mode
+
  | Z
  | Byte Enum
+
  | {{Change|Float|Double}}
  | Inventory operation mode, see below
+
  | Z position of the particle
 
  |-
 
  |-
  | Clicked item
+
  | Offset X
  | [[Slot Data|Slot]]
+
  | Float
  | The clicked slot. Has to be empty (item ID = -1) for drop mode.
+
  | This is added to the X position after being multiplied by random.nextGaussian()
|}
 
 
 
See [[Inventory]] for further information about how slots are indexed.
 
 
 
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
 
 
 
The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.
 
 
 
{| class="wikitable"
 
! Mode
 
! Button
 
! Slot
 
! Trigger
 
 
  |-
 
  |-
  !rowspan="2"| 0
+
  | Offset Y
  | 0
+
  | Float
  | Normal
+
  | This is added to the Y position after being multiplied by random.nextGaussian()
| Left mouse click
 
 
  |-
 
  |-
  | 1
+
  | Offset Z
  | Normal
+
  | Float
  | Right mouse click
+
  | This is added to the Z position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  !rowspan="2"| 1
+
  | Particle Data
  | 0
+
  | Float
  | Normal
+
  | The data of each particle
| Shift + left mouse click
 
 
  |-
 
  |-
  | 1
+
  | Particle Count
  | Normal
+
  | Int
  | Shift + right mouse click ''(identical behavior)''
+
  | The number of particles to create
 
  |-
 
  |-
  !rowspan="5"| 2
+
  | Data
  | 0
+
  | Varies
  | Normal
+
  | The variable data listed in [[#Particle|the particle data type]].
| Number key 1
 
|-
 
| 1
 
| Normal
 
| Number key 2
 
|-
 
| 2
 
| Normal
 
| Number key 3
 
|-
 
| ⋮
 
| ⋮
 
| ⋮
 
|-
 
| 8
 
| Normal
 
| Number key 9
 
|-
 
!rowspan="1"| 3
 
| 2
 
| Normal
 
| Middle click
 
|-
 
!rowspan="4"| 4
 
| 0
 
| Normal*
 
| Drop key (Q) (* Clicked item is different, see above)
 
|-
 
| 1
 
| Normal*
 
| Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
 
|-
 
| 0
 
| -999
 
| Left click outside inventory holding nothing ''(no-op)''
 
|-
 
| 1
 
| -999
 
| Right click outside inventory holding nothing ''(no-op)''
 
|-
 
!rowspan="6"| 5
 
| 0
 
| -999
 
| Starting left mouse drag ''(or middle mouse)''
 
|-
 
| 4
 
| -999
 
| Starting right mouse drag
 
|-
 
| 1
 
| Normal
 
| Add slot for left-mouse drag
 
|-
 
| 5
 
| Normal
 
| Add slot for right-mouse drag
 
|-
 
| 2
 
| -999
 
| Ending left mouse drag
 
|-
 
| 6
 
| -999
 
| Ending right mouse drag
 
|-
 
! 6
 
| 0
 
| Normal
 
| Double click
 
 
  |}
 
  |}
  
Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
+
==== Join Game ====
  
# packet with mode 5, slot -999, button (0 for left | 4 for right);
+
See [[Protocol Encryption]] for information on logging in.
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
# packet with mode 5, slot -999, button (2 | 6);
 
 
 
If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
 
 
The server will send back a [[Protocol#Confirm Transaction|Confirm Transaction]] packet. If the click was not accepted, the client must reflect that packet before sending more [[#Click Window|Click Window]] packets, otherwise the server will reject them silently. The Notchian server also sends a [[Protocol#Window Items|Window Items]] packet for the open window and [[Protocol#Set Slot|Set Slot]] packets for the clicked and cursor slot, but only when the click was not accepted, probably to resynchronize client and server.
 
 
 
==== Confirm Transaction ====
 
 
 
<SpaceManiac> noooo idea why the serverbound confirm transaction packet exists
 
<SpaceManiac> I think it's sent as a response to the clientbound confirm transaction in some situations, but it's fuzzy
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,219: Line 702:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x0F|0x10}}
+
  |rowspan="9"| {{change|0x25|0x26}}
  |rowspan="3"| Play
+
  |rowspan="9"| Play
  |rowspan="3"| Server
+
  |rowspan="9"| Client
  | Window ID
+
  | Entity ID
  | Byte
+
  | Int
  | The ID of the window that the action occurred in
+
  | The player's Entity ID (EID)
 
  |-
 
  |-
  | Action Number
+
  | Gamemode
  | Short
+
  | Unsigned Byte
  | Every action that is to be accepted has a unique number. This field corresponds to that number.
+
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
|-
 
| Accepted
 
| Boolean
 
| Whether the action was accepted
 
|}
 
 
 
==== Creative Inventory Action ====
 
 
 
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
 
 
 
Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.
 
 
 
This action can be described as “set inventory slot”. Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2×2 crafting menu, even though they aren't visible in the vanilla client).
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x10|0x11}}
+
  | Dimension
  |rowspan="2"| Play
+
| Int Enum
  |rowspan="2"| Server
+
  | -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
  | Slot
+
  |- {{Added}}
  | Short
+
  | Hashed seed
  | Inventory slot
+
  | Long
 +
  | First 8 bytes of the SHA-256 hash of the world's seed.
 
  |-
 
  |-
  | Clicked Item
+
  | Max Players
| [[Slot Data|Slot]]
+
  | Unsigned Byte
  |  
+
  | Was once used by the client to draw the player list, but now is ignored
  |}
 
 
 
==== Enchant Item ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x11|0x12}}
+
  | Level Type
|rowspan="2"| Play
+
  | String Enum (16)
  |rowspan="2"| Server
+
  | default, flat, largeBiomes, amplified, customized, buffet, default_1_1
  | Window ID
 
| Byte
 
| The ID of the enchantment table window sent by [[Protocol#Open Window|Open Window]]
 
 
  |-
 
  |-
  | Enchantment
+
  | View Distance
  | Byte
+
  | VarInt
  | The position of the enchantment on the enchantment table window, starting with 0 as the topmost one
+
  | Render distance (2-32)
|}
 
 
 
==== Update Sign ====
 
 
 
This message is sent from the client to the server when the “Done” button is pushed after placing a sign.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="5"| {{Change|0x12|0x13}}
+
  | Reduced Debug Info
|rowspan="5"| Play
+
  | Boolean
  |rowspan="5"| Server
+
  | If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}. For servers in development, this should almost always be false.
  | Location
+
  |- {{Added}}
| Position
+
  | Enable respawn screen
| Block Coordinates
 
|-
 
| Line 1
 
| {{Change|[[Chat]]|String}}
 
| First line of text in the sign
 
|-
 
| Line 2
 
| {{Change|[[Chat]]|String}}
 
| Second line of text in the sign
 
|-
 
| Line 3
 
| {{Change|[[Chat]]|String}}
 
| Third line of text in the sign
 
|-
 
| Line 4
 
| {{Change|[[Chat]]|String}}
 
  | Fourth line of text in the sign
 
|}
 
 
 
==== Player Abilities ====
 
 
 
The latter 2 bytes are used to indicate the walking and flying speeds respectively, while the first byte is used to determine the value of 4 booleans.
 
 
 
The vanilla client sends this packet when the player starts/stops flying with the second parameter changed accordingly. All other parameters are ignored by the vanilla server.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{Change|0x13|0x14}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Flags
 
| Byte
 
| Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
 
|-
 
| Flying Speed
 
| Float
 
|
 
|-
 
| Walking Speed
 
| Float
 
|
 
|}
 
 
 
==== Tab-Complete ====
 
 
 
Sent when the user presses ''tab'' while writing text.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
  |-
 
|rowspan="3"| {{Change|0x14|0x15}}
 
  |rowspan="3"| Play
 
|rowspan="3"| Server
 
| Text
 
| String
 
| All text behind the cursor
 
|-
 
| Has Position
 
 
  | Boolean
 
  | Boolean
  |  
+
  | Set to false when the doImmediateRespawn gamerule is true
|-
 
| Looked At Block
 
| Optional Position
 
| The position of the block being looked at. Only sent if Has Position is true.
 
 
  |}
 
  |}
  
==== Client Settings ====
+
==== Respawn ====
  
Sent when the player connects, or when settings are changed.
+
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,391: Line 754:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x15|0x16}}
+
  |rowspan="4"| {{change|0x3A|0x3B}}
  |rowspan="6"| Play
+
  |rowspan="4"| Play
  |rowspan="6"| Server
+
  |rowspan="4"| Client
  | Locale
+
  | Dimension
  | String
+
  | Int Enum
  | e.g. en_GB
+
  | -1: The Nether, 0: The Overworld, 1: The End
 +
|- {{Added}}
 +
| Hashed seed
 +
| Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 
  |-
 
  |-
  | View Distance
+
  | Gamemode
  | Byte
+
  | Unsigned Byte
  | Client-side render distance, in chunks
+
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 
  |-
 
  |-
  | Chat Mode
+
  | Level Type
  | {{Change|Byte|VarInt}} Enum
+
  | String (16)
| 0: enabled, 1: commands only, 2: hidden
+
  | Same as [[#Join Game|Join Game]]
  |-
 
| Chat Colors
 
| Boolean
 
| “Colors” multiplayer setting
 
|-
 
| Displayed Skin Parts
 
| Unsigned Byte
 
| Skin parts, see note below
 
|- style="background-color: #d9ead3;"
 
| Main Hand
 
| VarInt Enum
 
| 0: Left, 1: Right
 
 
  |}
 
  |}
  
''Displayed Skin Parts'' flags:
+
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
  
* Bit 0 (0x01): Cape enabled
+
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
* Bit 1 (0x02): Jacket enabled
 
* Bit 2 (0x04): Left Sleeve enabled
 
* Bit 3 (0x08): Right Sleeve enabled
 
* Bit 4 (0x10): Left Pants Leg enabled
 
* Bit 5 (0x20): Right Pants Leg enabled
 
* Bit 6 (0x40): Hat enabled
 
  
The most significant bit (bit 7, 0x80) appears to be unused.
+
=== Serverbound ===
  
==== Client Status ====
+
No changes so far.
  
Sent when the client is ready to complete login and when the client is ready to respawn after death.
+
== Handshaking ==
  
{| class="wikitable"
+
=== Clientbound ===
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| {{Change|0x16|0x17}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Action ID
 
| VarInt Enum
 
| See below
 
|}
 
  
''Action ID'' values:
+
There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.
  
{| class="wikitable"
+
=== Serverbound ===
|-
 
! Action ID
 
! Action
 
|-
 
| 0
 
| Perform respawn
 
|-
 
| 1
 
| Request stats
 
|-
 
| 2
 
| {{Change|''Taking Inventory'' achievement|Open Inventory}}
 
|}
 
  
==== Plugin Message ====
+
==== Handshake ====
  
Mods and plugins can use this to send their data. Minecraft itself uses a number of [[plugin channel]]s. These internal channels are prefixed with <code>MC|</code>.
+
This causes the server to switch into the target state.
 
 
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 
 
 
Note that the length of Data is known from the packet length, so there is no need for a length field of any kind.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,484: Line 802:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x17|0x18}}
+
  |rowspan="4"| 0x00
  |rowspan="2"| Play
+
  |rowspan="4"| Handshaking
  |rowspan="2"| Server
+
  |rowspan="4"| Server
  | Channel
+
  | Protocol Version
  | String
+
  | VarInt
  | Name of the [[plugin channel]] used to send the data
+
  | See [[protocol version numbers]] (currently {{change|498|578}})
 
  |-
 
  |-
  | Data
+
  | Server Address
| Byte Array
 
| Any data, depending on the channel. <code><nowiki>MC|</nowiki></code> channels are documented [[plugin channel|here]].
 
|}
 
 
 
==== Spectate ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| {{Change|0x18|0x19}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Target Player
 
| UUID
 
|
 
|}
 
 
 
==== Resource Pack Status ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| {{Change|0x19|0x1A}}
 
|rowspan="2"| Play
 
|rowspan="2"| Server
 
| Hash
 
 
  | String
 
  | String
  | The hash sent in the [[Protocol#Resource Pack Send|Resource Pack Send]] packet.
+
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
 +
|-
 +
| Server Port
 +
| Unsigned Short
 +
| Default is 25565.  The Notchian server does not use this information.
 
  |-
 
  |-
  | Result
+
  | Next State
 
  | VarInt Enum
 
  | VarInt Enum
  | 0: successfully loaded, 1: declined, 2: failed download, 3: accepted
+
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
 
  |}
 
  |}
  
Line 2,555: Line 841:
  
 
No changes so far.
 
No changes so far.
 +
 +
 +
[[Category:Minecraft Modern]]

Latest revision as of 18:36, 22 January 2020

This page documents the changes from the last stable Minecraft release (currently 1.14.4, protocol 498) to the current pre-release (currently 1.15.2, protocol 578). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes so far.

Packets

ID Packet name Documentation
Handshaking serverbound
0x00 Handshake Current Pre
Play clientbound
0x03 Spawn Mob Current Pre
0x05 Spawn Player Current Pre
0x5C 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Update Block Entity Current Pre
0x0A 0x0B Block Action Current (unchanged)
0x0B 0x0C Block Change Current (unchanged)
0x0C 0x0D Boss Bar Current (unchanged)
0x0D 0x0E Server Difficulty Current (unchanged)
0x0E 0x0F Chat Message (clientbound) Current (unchanged)
0x0F 0x10 Multi Block Change Current (unchanged)
0x10 0x11 Tab-Complete (clientbound) Current (unchanged)
0x11 0x12 Declare Commands Current (unchanged)
0x12 0x13 Confirm Transaction (clientbound) Current (unchanged)
0x13 0x14 Close Window (clientbound) Current (unchanged)
0x14 0x15 Window Items Current (unchanged)
0x15 0x16 Window Property Current (unchanged)
0x16 0x17 Set Slot Current (unchanged)
0x17 0x18 Set Cooldown Current (unchanged)
0x18 0x19 Plugin Message (clientbound) Current (unchanged)
0x19 0x1A Named Sound Effect Current (unchanged)
0x1A 0x1B Disconnect (play) Current (unchanged)
0x1B 0x1C Entity Status Current (unchanged)
0x1C 0x1D Explosion Current (unchanged)
0x1D 0x1E Unload Chunk Current (unchanged)
0x1E 0x1F Change Game State Current Pre
0x1F 0x20 Open Horse Window Current (unchanged)
0x20 0x21 Keep Alive (clientbound) Current (unchanged)
0x21 0x22 Chunk Data Current Pre
0x22 0x23 Effect Current (unchanged)
0x23 0x24 Particle Current Pre
0x24 0x25 Update Light Current (unchanged)
0x25 0x26 Join Game Current Pre
0x26 0x27 Map Data Current (unchanged)
0x27 0x28 Trade List Current (unchanged)
0x28 0x29 Entity Relative Move Current (unchanged)
0x29 0x2A Entity Look And Relative Move Current (unchanged)
0x2A 0x2B Entity Look Current (unchanged)
0x2B 0x2C Entity Current (unchanged)
0x2C 0x2D Vehicle Move (clientbound) Current (unchanged)
0x2D 0x2E Open Book Current (unchanged)
0x2E 0x2F Open Window Current (unchanged)
0x2F 0x30 Open Sign Editor Current (unchanged)
0x30 0x31 Craft Recipe Response Current (unchanged)
0x31 0x32 Player Abilities (clientbound) Current (unchanged)
0x32 0x33 Combat Event Current (unchanged)
0x33 0x34 Player Info Current (unchanged)
0x34 0x35 Face Player Current (unchanged)
0x35 0x36 Player Position And Look (clientbound) Current (unchanged)
0x36 0x37 Unlock Recipes Current (unchanged)
0x37 0x38 Destroy Entities Current (unchanged)
0x38 0x39 Remove Entity Effect Current (unchanged)
0x39 0x3A Resource Pack Send Current (unchanged)
0x3A 0x3B Respawn Current Pre
0x3B 0x3C Entity Head Look Current (unchanged)
0x3C 0x3D Select Advancement Tab Current (unchanged)
0x3D 0x3E World Border Current (unchanged)
0x3E 0x3F Camera Current (unchanged)
0x3F 0x40 Held Item Change (clientbound) Current (unchanged)
0x40 0x41 Update View Position Current (unchanged)
0x41 0x42 Update View Distance Current (unchanged)
0x42 0x43 Display Scoreboard Current (unchanged)
0x43 0x44 Entity Metadata Current (unchanged)
0x44 0x45 Attach Entity Current (unchanged)
0x45 0x46 Entity Velocity Current (unchanged)
0x46 0x47 Entity Equipment Current (unchanged)
0x47 0x48 Set Experience Current (unchanged)
0x48 0x49 Update Health Current (unchanged)
0x49 0x4A Scoreboard Objective Current (unchanged)
0x4A 0x4B Set Passengers Current (unchanged)
0x4B 0x4C Teams Current (unchanged)
0x4C 0x4D Update Score Current (unchanged)
0x4D 0x4E Spawn Position Current (unchanged)
0x4E 0x4F Time Update Current (unchanged)
0x4F 0x50 Title Current (unchanged)
0x50 0x51 Entity Sound Effect Current (unchanged)
0x51 0x52 Sound Effect Current (unchanged)
0x52 0x53 Stop Sound Current (unchanged)
0x53 0x54 Player List Header And Footer Current (unchanged)
0x54 0x55 NBT Query Response Current (unchanged)
0x55 0x56 Collect Item Current (unchanged)
0x56 0x57 Entity Teleport Current (unchanged)
0x57 0x58 Advancements Current (unchanged)
0x58 0x59 Entity Properties Current (unchanged)
0x59 0x5A Entity Effect Current (unchanged)
0x5A 0x5B Declare Recipes Current (unchanged)
0x5B 0x5C Tags Current (unchanged)

New/modified data types

No changes so far.

Entity Metadata

Warning.png Lots of shifts, of course

Living

Extends Entity.

Index Type Meaning Default
7 Byte Hand states, used to trigger blocking/eating/drinking animation. 0
Bit mask Meaning
0x01 Is hand active
0x02 Active hand (0 = main hand, 1 = offhand)
0x04 In riptide spin attack
8 Float Health 1.0
9 VarInt Potion effect color (or 0 if there is no effect) 0
10 Boolean Is potion effect ambient: reduces the number of particles generated by potions to 1/5 the normal amount false
11 VarInt Number of arrows in entity 0
12 VarInt Health added by absorption (based on the AbsorptionAmount tag) 0
12 13 OptBlockPos Sleeping location (from SleepingX, SleepingY, SleepingZ tags) Absent

Bee

Extends Insentient.

Index Type Meaning Default
16 Byte Flags 0
0x01 Unused
0x02 Is angry
0x04 Has stung
0x08 Has nectar
17 VarInt Anger time in ticks 0 (Not angry)

Wolf

Extends TameableAnimal.

Index Type Meaning Default
17 Float Damage taken (used for tail rotation) Value of health field (1.0)
18 Boolean Is begging false
19 VarInt Collar color (values are those used with dyes) 14 (Red)

Enderman

Extends Monster.

Index Type Meaning Default
14 15 Opt BlockID Carried block Absent
15 16 Boolean Is screaming false
17 Boolean Is stared at false

Trident

Extends TameableAnimal.

Index Type Meaning Default
10 VarInt Loyalty level (enchantment) 0
11 Boolean Has enchantment glint False

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Spawn Mob

Sent by the server when a mob entity is spawned.

Packet ID State Bound To Field Name Field Type Notes
0x03 Play Client Entity ID VarInt
Entity UUID UUID
Type VarInt The type of mob. See Entities#Mobs
X Double
Y Double
Z Double
Yaw Angle
Pitch Angle
Head Pitch Angle
Velocity X Short Same units as Entity Velocity
Velocity Y Short Same units as Entity Velocity
Velocity Z Short Same units as Entity Velocity
Metadata Entity Metadata

Spawn Player

This packet is sent by the server when a player comes into visible range, not when a player joins.

This packet must be sent after the Player Info packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.

Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Entity ID VarInt Player's EID
Player UUID UUID See below for notes on offline mode and NPCs
X Double
Y Double
Z Double
Yaw Angle
Pitch Angle
Metadata Entity Metadata

When in online mode, the UUIDs must be valid and have valid skin blobs.

In offline mode, UUID v3 is used with the String OfflinePlayer:<player name>, encoded in UTF-8 (and case-sensitive).

For NPCs UUID v2 should be used. Note:

<+Grum> i will never confirm this as a feature you know that :)

In an example UUID, xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx, the UUID version is specified by Y. So, for UUID v3, Y will always be 3, and for UUID v2, Y will always be 2.

Update Block Entity

Sets the block entity associated with the block at the given location.

Packet ID State Bound To Field Name Field Type Notes
0x09 0x0A Play Client Location Position
Action Unsigned Byte The type of update to perform, see below
NBT Data NBT Tag Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)

Action field:

  • 1: Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
  • 2: Set command block text (command and last execution status)
  • 3: Set the level, primary, and secondary powers of a beacon
  • 4: Set rotation and skin of mob head
  • 5: Declare a conduit
  • 6: Set base color and patterns on a banner
  • 7: Set the data for a Structure tile entity
  • 8: Set the destination for a end gateway
  • 9: Set the text on a sign
  • 10: Unused
  • 11: Declare a bed
  • 12: Set data of a jigsaw block
  • 13: Set items in a campfire
  • 14: Beehive information

Change Game State

Used for a wide variety of game state things, from whether to bed use to gamemode to demo messages.

Packet ID State Bound To Field Name Field Type Notes
0x1F Play Client Reason Unsigned Byte See below
Value Float Depends on Reason

Reason codes:

Reason Effect Value
0 Invalid Bed Would be used to switch between messages, but the only used message is 0 for invalid bed
1 End raining
2 Begin raining
3 Change gamemode 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
4 Exit end 0: Immediately send Client Status of respawn without showing end credits; 1: Show end credits and respawn at the end (or when esc is pressed). 1 is sent if the player has not yet received the "The end?" advancement, while if they do have it 0 is used.
5 Demo message 0: Show welcome to demo screen, 101: Tell movement controls, 102: Tell jump control, 103: Tell inventory control
6 Arrow hitting player Appears to be played when an arrow strikes another player in Multiplayer
7 Fade value The current darkness value. 1 = Dark, 0 = Bright, Setting the value higher causes the game to change color and freeze
8 Fade time Time in ticks for the sky to fade
9 Play pufferfish sting sound
10 Play elder guardian mob appearance (effect and sound)
11 Enable respawn screen 0: Enable respawn screen, 1: Immediately respawn (sent when the doImmediateRespawn gamerule changes)

Chunk Data

Main article: Chunk Format
See also: #Unload Chunk
Huh.png The following information needs to be added to this page:
How do biomes work now? The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed... (/r/mojira discussion which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)

The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent. This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with Update Block Entity later).

Packet ID State Bound To Field Name Field Type Notes
0x21 0x22 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes Optional array of Integer 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Not present if full chunk is false.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

Note that the Notchian client requires an Update View Position packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.

To get the biome at a coordinate, use biomes[((y >> 2) & 63) << 4 | ((z >> 2) & 3) << 2 | ((x >> 2) & 3)]

Data structure

The data section of the packet contains most of the useful data for the chunk.

Field Name Field Type Notes
Data Array of Chunk Section The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
Biomes Optional Int Array Only sent if full chunk is true; 256 entries if present

Particle

Displays the named particle.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x24 Play Client Particle ID Int The particle ID listed in the particle data type.
Long Distance Boolean If true, particle distance increases from 256 to 65536
X Float Double X position of the particle
Y Float Double Y position of the particle
Z Float Double Z position of the particle
Offset X Float This is added to the X position after being multiplied by random.nextGaussian()
Offset Y Float This is added to the Y position after being multiplied by random.nextGaussian()
Offset Z Float This is added to the Z position after being multiplied by random.nextGaussian()
Particle Data Float The data of each particle
Particle Count Int The number of particles to create
Data Varies The variable data listed in the particle data type.

Join Game

See Protocol Encryption for information on logging in.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x26 Play Client Entity ID Int The player's Entity ID (EID)
Gamemode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
Dimension Int Enum -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Max Players Unsigned Byte Was once used by the client to draw the player list, but now is ignored
Level Type String Enum (16) default, flat, largeBiomes, amplified, customized, buffet, default_1_1
View Distance VarInt Render distance (2-32)
Reduced Debug Info Boolean If true, a Notchian client shows reduced information on the debug screen. For servers in development, this should almost always be false.
Enable respawn screen Boolean Set to false when the doImmediateRespawn gamerule is true

Respawn

To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.

Packet ID State Bound To Field Name Field Type Notes
0x3A 0x3B Play Client Dimension Int Enum -1: The Nether, 0: The Overworld, 1: The End
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
Level Type String (16) Same as Join Game

Warning.png Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).

If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.

Serverbound

No changes so far.

Handshaking

Clientbound

There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.

Serverbound

Handshake

This causes the server to switch into the target state.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 498 578)
Server Address String Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.