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|1.15.2, protocol 578]]) to the current pre-release (currently [[Protocol version numbers|1.16.1, protocol 736]]). 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|1.16.5, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|21w07a, protocol {{Snapshot PVN|1073741839}}]]). 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.
Line 9: Line 9:
 
=== Data types ===
 
=== Data types ===
  
The UUID type is now also sometimes encoded by the Notchian server as an array of four 32-bit integers, from most significant to least significant (matching the new format used on entity NBT).  This representation is identical to using 16 bytes, two 64-bit integers, or one 128-bit integers.
+
No changes so far.
  
 
=== Packets ===
 
=== Packets ===
Line 17: Line 17:
 
  ! Packet name
 
  ! Packet name
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
|-
 
!colspan="4"| Handshaking serverbound
 
{{PacketList|0x00|Handshake}}
 
 
  |-
 
  |-
 
!colspan="4"| Play clientbound
 
!colspan="4"| Play clientbound
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
+
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
+
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
+
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
+
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
+
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x11}}|Declare Commands|pre=unchanged}}
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
+
{{PacketList|{{change|0x11|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x10|0x0F}}|Multi Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x11|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
{{PacketList|{{change|0x12|0x11}}|Declare Commands|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
{{PacketList|{{change|0x13|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
{{PacketList|{{change|0x14|0x13}}|Close Window (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{change|0x15|0x14}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x16|0x15}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x17|0x16}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{change|0x18|0x17}}|Set Cooldown|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
{{PacketList|{{change|0x19|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
{{PacketList|{{change|0x1A|0x19}}|Named Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{change|0x1B|0x1A}}|Disconnect (play)|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
{{PacketList|{{change|0x1C|0x1B}}|Entity Status|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{change|0x1D|0x1C}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x1E|0x1D}}|Unload Chunk|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
{{PacketList|{{change|0x1F|0x1E}}|Change Game State|pre=unchanged}}
+
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
{{PacketList|{{change|0x20|0x1F}}|Open Horse Window|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x23}}|Particle|pre=unchanged}}
{{PacketList|{{change|0x21|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x24}}|Update Light}}
{{PacketList|{{change|0x22|0x21}}|Chunk Data}}
+
{{PacketList|{{change|0x24|0x25}}|Join Game|pre=unchanged}}
{{PacketList|{{change|0x23|0x22}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x26}}|Map Data}}
{{PacketList|{{change|0x24|0x23}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x27}}|Trade List|pre=unchanged}}
{{PacketList|{{change|0x25|0x24}}|Update Light}}
+
{{PacketList|{{change|0x27|0x28}}|Entity Position|pre=unchanged}}
{{PacketList|{{change|0x26|0x25}}|Join Game}}
+
{{PacketList|{{change|0x28|0x29}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{change|0x27|0x26}}|Map Data|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2A}}|Entity Rotation|pre=unchanged}}
{{PacketList|{{change|0x28|0x27}}|Trade List|pre=unchanged}}
+
{{PacketList|{{change|0x2A|0x2B}}|Entity Movement|pre=unchanged}}
{{PacketList|{{change|0x29|0x28}}|Entity Position|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x2A|0x29}}|Entity Position and Rotation|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
{{PacketList|{{change|0x2B|0x2A}}|Entity Rotation|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
{{PacketList|{{change|0x2C|0x2B}}|Entity Movement|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{change|0x2D|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{change|0x2E|0x2D}}|Open Book|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x2F|0x2E}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x32}}|Combat Event|pre=unchanged}}
{{PacketList|{{change|0x30|0x2F}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x33}}|Player Info|pre=unchanged}}
{{PacketList|{{change|0x31|0x30}}|Craft Recipe Response|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x34}}|Face Player|pre=unchanged}}
{{PacketList|{{change|0x32|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x35}}|Player Position And Look (clientbound)}}
{{PacketList|{{change|0x33|0x32}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x36}}|Unlock Recipes|pre=unchanged}}
{{PacketList|{{change|0x34|0x33}}|Player Info|pre=unchanged}}
+
{{PacketList|{{change|0x36|0x37}}|Destroy Entities|pre=unchanged}}
{{PacketList|{{change|0x35|0x34}}|Face Player|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x38}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{change|0x36|0x35}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x38|0x39}}|Resource Pack Send}}
{{PacketList|{{change|0x37|0x36}}|Unlock Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x3A}}|Respawn|pre=unchanged}}
{{PacketList|{{change|0x38|0x37}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x3A|0x3B}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{change|0x39|0x38}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x3B|0x3C}}|Multi Block Change|pre=unchanged}}
{{PacketList|{{change|0x3A|0x39}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
{{PacketList|{{change|0x3B|0x3A}}|Respawn}}
+
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
{{PacketList|{{change|0x3C|0x3B}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x3E|0x3F}}|Camera|pre=unchanged}}
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
+
{{PacketList|{{change|0x3F|0x40}}|Held Item Change (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x43}}|Spawn Position|pre=unchanged}}
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
+
{{PacketList|{{change|0x43|0x44}}|Display Scoreboard|pre=unchanged}}
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
+
{{PacketList|{{change|0x44|0x45}}|Entity Metadata|pre=unchanged}}
{{PacketList|0x47|Entity Equipment}}
+
{{PacketList|{{change|0x45|0x46}}|Attach Entity|pre=unchanged}}
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x46|0x47}}|Entity Velocity|pre=unchanged}}
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x47|0x48}}|Entity Equipment|pre=unchanged}}
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x48|0x49}}|Set Experience|pre=unchanged}}
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x49|0x4A}}|Update Health|pre=unchanged}}
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x4A|0x4B}}|Scoreboard Objective|pre=unchanged}}
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
+
{{PacketList|{{change|0x4B|0x4C}}|Set Passengers|pre=unchanged}}
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x4C|0x4D}}|Teams|pre=unchanged}}
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
+
{{PacketList|{{change|0x4D|0x4E}}|Update Score|pre=unchanged}}
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x50|0x51}}|Entity Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
+
{{PacketList|{{change|0x51|0x52}}|Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x52|0x53}}|Stop Sound|pre=unchanged}}
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
+
{{PacketList|{{change|0x53|0x54}}|Player List Header And Footer|pre=unchanged}}
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
+
{{PacketList|{{change|0x54|0x55}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x56}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x57}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x58}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x59}}|Entity Properties|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5C}}|Tags}}
 
  |-
 
  |-
 
!colspan="4"| Play serverbound
 
!colspan="4"| Play serverbound
{{PacketList|0x0E|Interact Entity}}
+
{{PacketList|0x05|Client Settings}}
{{PacketList|0x0F|Generate Structure|rel=added}}
 
{{PacketList|{{change|0x0F|0x10}}|Keep Alive (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x10|0x11}}|Lock Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x11|0x12}}|Player Position|pre=unchanged}}
 
{{PacketList|{{change|0x12|0x13}}|Player Position And Rotation (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x13|0x14}}|Player Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x14|0x15}}|Player Movement|pre=unchanged}}
 
{{PacketList|{{change|0x15|0x16}}|Vehicle Move (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x16|0x17}}|Steer Boat|pre=unchanged}}
 
{{PacketList|{{change|0x17|0x18}}|Pick Item|pre=unchanged}}
 
{{PacketList|{{change|0x18|0x19}}|Craft Recipe Request|pre=unchanged}}
 
{{PacketList|{{change|0x19|0x1A}}|Player Abilities (serverbound)}}
 
{{PacketList|{{change|0x1A|0x1B}}|Player Digging|pre=unchanged}}
 
{{PacketList|{{change|0x1B|0x1C}}|Entity Action|pre=unchanged}}
 
{{PacketList|{{change|0x1C|0x1D}}|Steer Vehicle|pre=unchanged}}
 
{{PacketList|{{change|0x1D|0x1E}}|Recipe Book Data|pre=unchanged}}
 
{{PacketList|{{change|0x1E|0x1F}}|Name Item|pre=unchanged}}
 
{{PacketList|{{change|0x1F|0x20}}|Resource Pack Status|pre=unchanged}}
 
{{PacketList|{{change|0x20|0x21}}|Advancement Tab|pre=unchanged}}
 
{{PacketList|{{change|0x21|0x22}}|Select Trade|pre=unchanged}}
 
{{PacketList|{{change|0x22|0x23}}|Set Beacon Effect|pre=unchanged}}
 
{{PacketList|{{change|0x23|0x24}}|Held Item Change (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x24|0x25}}|Update Command Block|pre=unchanged}}
 
{{PacketList|{{change|0x25|0x26}}|Update Command Block Minecart|pre=unchanged}}
 
{{PacketList|{{change|0x26|0x27}}|Creative Inventory Action|pre=unchanged}}
 
{{PacketList|{{change|0x27|0x28}}|Update Jigsaw Block}}
 
{{PacketList|{{change|0x28|0x29}}|Update Structure Block|pre=unchanged}}
 
{{PacketList|{{change|0x29|0x2A}}|Update Sign|pre=unchanged}}
 
{{PacketList|{{change|0x2A|0x2B}}|Animation (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x2B|0x2C}}|Spectate|pre=unchanged}}
 
{{PacketList|{{change|0x2C|0x2D}}|Player Block Placement|pre=unchanged}}
 
{{PacketList|{{change|0x2D|0x2E}}|Use Item|pre=unchanged}}
 
 
  |-
 
  |-
!colspan="4"| Login clientbound
+
!colspan="4"| Handshaking serverbound
{{PacketList|0x02|Login Success}}
+
{{PacketList|0x00|Handshake}}
 
  |}
 
  |}
  
Line 151: Line 123:
 
{{#vardefine:meta_prerelease|1}}
 
{{#vardefine:meta_prerelease|1}}
  
=== FishingHook ===
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  
{{Metadata inherit|FishingHook|inherits=Entity|start_at=7}}
+
=== Entity ===
  
{| class="wikitable"
+
{{metadata inherit|Entity}}
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Hooked entity id + 1, or 0 if there is no hooked entity
 
| 0
 
|- {{Added}}
 
| {{Metadata id|added}}
 
| Boolean
 
|colspan="2"| Is catchable
 
| False
 
|}
 
 
 
=== Abstract Arrow ===
 
 
 
{{Metadata inherit|Abstract Arrow|inherits=Entity|start_at=7}}
 
 
 
Abstract base class for [[#Tipped Arrow|Tipped Arrow]] (which is used for regular arrows as well as tipped ones) and [[#Spectral Arrow|Spectral Arrow]].
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 184: Line 135:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | rowspan="3" | {{Metadata id|}}
+
  |rowspan="9"| {{Metadata id|}}
  | rowspan="3" | Byte
+
  |rowspan="9"| Byte
 
  ! Bit mask
 
  ! Bit mask
 
  ! Meaning
 
  ! Meaning
  | rowspan="3" | 0
+
  |rowspan="9"| 0
 
  |-
 
  |-
 
  | 0x01
 
  | 0x01
  | Is critical
+
  | Is on fire
 
  |-
 
  |-
 
  | 0x02
 
  | 0x02
  | Is noclip (used by loyalty tridents when returning)
+
  | Is crouching
|- {{removed}}
 
| {{Metadata id|removed}}
 
| OptUUID
 
|colspan="2"| Unused
 
| Empty
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x04
| Byte
+
  | Unused (previously riding)
|colspan="2"| Peircing level
 
| 0
 
|}
 
 
 
=== Tipped Arrow ===
 
 
 
{{Metadata inherit|Tipped Arrow|inherits=Abstract Arrow}}
 
 
 
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Color (-1 for no particles)
 
| -1
 
|}
 
 
 
=== Spectral Arrow ===
 
 
 
{{Metadata inherit|Spectral Arrow|inherits=Abstract Arrow}}
 
 
 
No additional metadata.
 
 
 
=== Trident ===
 
 
 
{{Metadata inherit|Trident|inherits=Abstract Arrow}}
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
  | {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Loyalty level (enchantment)
 
| 0
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Has enchantment glint
 
| False
 
|}
 
 
 
=== Strider ===
 
 
 
{{Metadata inherit|Strider|inherits=Animal|start_at=16}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x08
| VarInt
+
  | Is sprinting
|colspan="2"| Total time to "boost" with warped fungus on a stick for
 
  | 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x10
| Boolean
+
  | Is swimming
  |colspan="2"| Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava))
 
| false
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x20
| Boolean
+
  | Is invisible
|colspan="2"| Has saddle
 
| false
 
|}
 
 
 
=== Hoglin ===
 
 
 
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
  ! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x40
| Boolean
+
  | has glowing effect
|colspan="2"| Is immune to zombification
 
| false
 
|}
 
 
 
=== Zoglin ===
 
 
 
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
  ! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x80
  | Boolean
+
  | Is flying with an {{Minecraft Wiki|elytra}}
|colspan="2"| Is baby
 
| false
 
|}
 
 
 
=== Piglin ===
 
 
 
{{Metadata inherit|Piglin|inherits=Monster|start_at=15}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | VarInt
  |colspan="2"| Is baby
+
  |colspan="2"| Air ticks
  | false
+
  | 300
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | OptChat
  |colspan="2"| Is immune to zombification
+
  |colspan="2"| Custom name
  | false
+
  | empty
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is charging crossbow
+
  |colspan="2"| Is custom name visible
 
  | false
 
  | false
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is dancing
+
  |colspan="2"| Is silent
 
  | false
 
  | false
|}
 
 
=== Wolf ===
 
 
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is begging
+
  |colspan="2"| Has no gravity
 
  | false
 
  | false
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 +
| Pose
 +
|colspan="2"| Pose
 +
| STANDING
 +
|- {{added}}
 +
| {{Metadata id|added}}
 
  | VarInt
 
  | VarInt
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
+
  |colspan="2"| Ticks frozen in powdered snow
| 14 (Red)
 
|- {{Added}}
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Anger time
 
 
  | 0
 
  | 0
 
  |}
 
  |}
 
=== {{Change|Zombie Pigman|Zombified Piglin}} ===
 
 
{{Metadata inherit|{{Change|Zombie Pigman|Zombified Piglin}}|inherits=Zombie|start_at=18}}
 
 
No additional metadata.
 
  
 
== Block Actions ==
 
== Block Actions ==
Line 389: Line 217:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Chat Message (clientbound) ====  
+
==== Sculk Vibration Signal ====
 
 
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options.  See [[Chat#Processing chat|processing chat]] for more info about these positions.
 
 
 
{{warning2|Game info accepts json formatting but does not display it, although the deprecated §-based formatting works.  This is not an issue when using the [[#Title|Title]] packet, so prefer that packet for displaying information in that slot.  See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.}}
 
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 403: Line 227:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{change|0x0F|0x0E}}
+
  |rowspan="4"| 0x05
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Client
+
  |rowspan="4"| Client
  | JSON Data
+
  | Source Position
  | [[Chat]]
+
| Position
  | Limited to 32767 bytes
+
| Source position for the vibration.
 +
|-
 +
| Destination Identifier
 +
| Identifier
 +
| Identifier of the destination codec type.
 +
  |-
 +
| Destination
 +
| Varies
 +
  | Vanilla default destinations are a block position encoded as a [https://wiki.vg/Protocol#Data_types Position] for "block" or an entity id encoded as a VarInt for "entity".
 
  |-
 
  |-
  | Position
+
  | Arrival Ticks
  | Byte
+
  | VarInt
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
+
  | Ticks for the signal to arrive at the destination.
|- {{added}}
 
| Sender
 
| UUID
 
| Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
 
 
  |}
 
  |}
 +
This packet shows a permanent particle.
  
 
==== Chunk Data ====
 
==== Chunk Data ====
Line 425: Line 254:
 
{{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)}}
 
{{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)}}
  
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).
+
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimension 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"
Line 435: Line 264:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x22|0x21}}
+
  |rowspan="13"| {{change|0x20|0x21}}
  |rowspan="11"| Play
+
  |rowspan="13"| Play
  |rowspan="11"| Client
+
  |rowspan="13"| Client
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
Line 445: Line 274:
 
  | Int
 
  | Int
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
  |-
+
  |- {{removed}}
 
  | Full chunk
 
  | Full chunk
 
  | Boolean
 
  | Boolean
 
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  | See [[Chunk Format#Full chunk|Chunk Format]]
  |- {{Added}}
+
  |- {{removed}}
| Ignore old data
 
| Boolean
 
| If false, the client will recalculate lighting based on the old/new chunk data
 
|-
 
 
  | Primary Bit Mask
 
  | Primary Bit Mask
 
  | VarInt
 
  | 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).
 
  | 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).
 +
|- {{added}}
 +
| Bit Mask Length
 +
| VarInt
 +
| Length of the following array
 +
|- {{added}}
 +
| Primary Bit Mask
 +
| Array of Long
 +
| BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
 
  |-
 
  |-
 
  | Heightmaps
 
  | Heightmaps
 
  | [[NBT]]
 
  | [[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.
 
  | 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.
 +
|-
 +
| Biomes length
 +
| {{change|Optional|}} VarInt
 +
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 
  |-
 
  |-
 
  | Biomes
 
  | Biomes
  | Optional array of Integer
+
  | {{change|Optional|}} Array of VarInt
  | 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  Not present if full chunk is false.
+
  | 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  {{change|Not present if full chunk is false.|}}  See [[Chunk Format#Biomes|Chunk Format § Biomes]].
 
  |-  
 
  |-  
 
  | Size
 
  | Size
Line 485: Line 322:
 
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.
 
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.
  
{{Change||The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.}}
+
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
 +
 
 +
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
 +
 
 +
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
 +
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
  
 
==== Update Light ====
 
==== Update Light ====
Line 499: Line 341:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x25|0x24}}
+
  |rowspan="21"| {{change|0x23|0x24}}
  |rowspan="11"| Play
+
  |rowspan="21"| Play
  |rowspan="11"| Client
+
  |rowspan="21"| Client
 
  |colspan="2"| Chunk X
 
  |colspan="2"| Chunk X
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)  
 
  |-
 
  |-
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)  
  |- {{added}}
+
  |-
 
  |colspan="2"| Trust Edges
 
  |colspan="2"| Trust Edges
 
  |colspan="2"| Boolean
 
  |colspan="2"| Boolean
 
  | If edges should be trusted for light updates.
 
  | If edges should be trusted for light updates.
|
+
  |- {{removed}}
  |-
 
 
  |colspan="2"| Sky Light Mask
 
  |colspan="2"| Sky Light Mask
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
 
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
 
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
  |-
+
  |- {{removed}}
 
  |colspan="2"| Block Light Mask
 
  |colspan="2"| Block Light Mask
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
 
  | Mask containing 18 bits, with the same order as sky light
 
  | Mask containing 18 bits, with the same order as sky light
  |-
+
  |- {{removed}}
 
  |colspan="2"| Empty Sky Light Mask
 
  |colspan="2"| Empty Sky Light Mask
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
 
  | Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 
  | Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
  |-
+
  |- {{removed}}
 
  |colspan="2"| Empty Block Light Mask
 
  |colspan="2"| Empty Block Light Mask
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
 
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 +
|- {{Added}}
 +
|colspan="2"| Length 1
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
 +
|- {{Added}}
 +
|colspan="2"| Length 2
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2, same order as sky light
 +
|- {{Added}}
 +
|colspan="2"| Length 3
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
 +
|- {{Added}}
 +
|colspan="2"| Length 4
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
 +
|- {{added}}
 +
|colspan="2"| Sky Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 
  |-
 
  |-
 
  |rowspan="2"| Sky Light arrays
 
  |rowspan="2"| Sky Light arrays
Line 540: Line 417:
 
  | Array of 2048 bytes
 
  | Array of 2048 bytes
 
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 +
|- {{added}}
 +
|colspan="2"| Block Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 
  |-
 
  |-
 
  |rowspan="2"| Block Light arrays
 
  |rowspan="2"| Block Light arrays
Line 552: Line 433:
 
  |}
 
  |}
  
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
 
  
==== Join Game ====
+
==== Map Data ====
  
See [[Protocol Encryption]] for information on logging in.
+
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 562: Line 442:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="16"| {{change|0x26|0x25}}
+
  |rowspan="18"| {{change|0x25|0x26}}
  |rowspan="16"| Play
+
  |rowspan="18"| Play
  |rowspan="16"| Client
+
  |rowspan="18"| Client
  | Entity ID
+
  |colspan="2"| Map ID
  | Int
+
  |colspan="2"| VarInt
  | The player's Entity ID (EID)
+
  | Map ID of the map being modified
 
  |-
 
  |-
  | Gamemode
+
  |colspan="2"| Scale
| Unsigned Byte
+
  |colspan="2"| Byte
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
+
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
|- {{Added}}
+
  |- {{removed}}
| Previous Gamemode
+
  |colspan="2"| Tracking Position
| Unsigned Byte
+
  |colspan="2"| Boolean
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
+
  | Specifies whether player and item frame icons are shown
  |- {{Added}}
 
  | World Count
 
| VarInt
 
  | Size of the following array
 
|- {{Added}}
 
  | World Names
 
| Array of Identifier
 
| Identifiers for all worlds on the server
 
|- {{Added}}
 
| Dimension Codec
 
| [[NBT|NBT Tag Compound]]
 
| This CompoundTag contains a ListTag named "dimension". The ListTag should contain CompoundTags with named StringTags "key" and "element". The full extent of these is still unknown, but the tag represents a dimension registry. See below for the vanilla default.
 
 
  |-
 
  |-
  | Dimension
+
  |colspan="2"| Locked
  | {{change|Int Enum|Identifier}}
+
  |colspan="2"| Boolean
  | {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent before this}}
+
| True if the map has been locked in a cartography table
  |- {{Added}}
+
  |-  
  | World Name
+
  |- {{added}}
  | Identifier
+
  |colspan="2"| Tracking Position
  | Name of the world being spawned into
+
  |colspan="2"| Boolean
 +
  | Specifies whether player and item frame icons are shown
 
  |-
 
  |-
  | Hashed seed
+
  |colspan="2"| Icon Count
  | Long
+
  |colspan="2"| VarInt
  | First 8 bytes of the SHA-256 hash of the world's seed.
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 
  |-
 
  |-
  | Max Players
+
  |rowspan="6"| Icon
| Unsigned Byte
+
  | Type
  | Was once used by the client to draw the player list, but now is ignored
+
  |rowspan="6"| Array
  |- {{Removed}}
+
  | VarInt enum
| Level Type
+
  | See below
  | String Enum (16)
 
  | default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
 
  |-
 
  |-
  | View Distance
+
  | X
| VarInt
 
| Render distance (2-32)
 
|-
 
| Reduced Debug Info
 
| Boolean
 
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|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
 
|- {{Added}}
 
| Is Debug
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 
|- {{Added}}
 
| Is Flat
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
|}
 
Example of Dimension codec CompoundTag sent by the server:
 
    ListTag (Type: CompoundTag) "dimension":
 
        CompoundTag:
 
            StringTag "name" value: 'minecraft:overworld'
 
            ByteTag "natural": 1
 
            Some more attributes ...
 
 
 
Known attributes :
 
 
 
{| class="wikitable"
 
! Name
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Values
 
|-
 
| name
 
| String
 
|colspan="2"| Dimension's name
 
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 
|-
 
| natural
 
 
  | Byte
 
  | Byte
  |colspan="2"| Is it a standard overworld like dimension
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
| 1: true, 0: false
 
|-
 
| ambient_light
 
| Float
 
|colspan="2"| Ambient light
 
| 0.0 to 1.0
 
 
  |-
 
  |-
  | has_ceiling
+
  | Z
 
  | Byte
 
  | Byte
  |colspan="2"| Does the dimension have blocks on top ? Like the nether
+
  | Map coordinates: -128 for highest, +127 for lowest
| 1: true, 0: false
 
 
  |-
 
  |-
  | has_skylight
+
  | Direction
 
  | Byte
 
  | Byte
  |colspan="2"| Does the dimension have natural sky light
+
  | 0-15
| 1: true, 0: false
 
 
  |-
 
  |-
  | fixed_time
+
  | Has Display Name
  | Long
+
  | Boolean
  |colspan="2"| Set fixed minecraft clock time
+
  |
| 0 to 12000
 
 
  |-
 
  |-
  | shrunk
+
  | Display Name
  | Byte
+
  | Optional [[Chat]]
  |colspan="2"| ?
+
| Only present if previous Boolean is true
  | 1: true, 0: false
+
|-
 +
|colspan="2"| Columns
 +
  |colspan="2"| Unsigned Byte
 +
  | Number of columns updated
 
  |-
 
  |-
  | ultrawarm
+
  |colspan="2"| Rows
| Byte
+
  |colspan="2"| Optional Byte
  |colspan="2"| ?
+
  | Only if Columns is more than 0; number of rows updated
  | 1: true, 0: false
 
 
  |-
 
  |-
  | has_raids
+
  |colspan="2"| X
| Byte
+
  |colspan="2"| Optional Byte
  |colspan="2"| ?
+
  | Only if Columns is more than 0; x offset of the westernmost column
  | 1: true, 0: false
 
 
  |-
 
  |-
  | respawn_anchor_works
+
  |colspan="2"| Z
| Byte
+
  |colspan="2"| Optional Byte
  |colspan="2"| Wether or not respawn anchor can be used
+
  | Only if Columns is more than 0; z offset of the northernmost row
  | 1: true, 0: false
 
 
  |-
 
  |-
  | bed_works
+
  |colspan="2"| Length
| Byte
+
  |colspan="2"| Optional VarInt
  |colspan="2"| Wether or not beds can be used
+
  | Only if Columns is more than 0; length of the following array
  | 1: true, 0: false
 
 
  |-
 
  |-
| piglin_safe
+
  |colspan="2"| Data
| Byte
+
  |colspan="2"| Optional Array of Unsigned Byte
  |colspan="2"| ?
+
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
| 1: true, 0: false
 
|-
 
| logical_height
 
| Int
 
  |colspan="2"| Maybe the world's max height in blocks ?
 
  | 0-256
 
|-
 
| infiniburn
 
| String
 
|colspan="2"| ?
 
| "" or minecraft resource "minecraft:..."
 
 
  |}
 
  |}
  
==== Respawn ====
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
  
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.
+
Types are based off of rows and columns in <code>map_icons.png</code>:
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="9"| {{Change|0x3B|0x3A}}
+
  ! Icon type
  |rowspan="9"| Play
+
  ! Result
|rowspan="9"| Client
 
| Dimension
 
| {{change|Int Enum|Identifier}}
 
| {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent in [[#Join Game|Join Game]]}}
 
|- {{Added}}
 
| World Name
 
| Identifier
 
| Name of the world being spawned into
 
 
  |-
 
  |-
  | Hashed seed
+
  | 0
  | Long
+
  | White arrow (players)
| First 8 bytes of the SHA-256 hash of the world's seed.
 
 
  |-
 
  |-
  | Gamemode
+
  | 1
| Unsigned Byte
+
  | Green arrow (item frames)
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 
|- {{Added}}
 
| Previous Gamemode
 
| Unsigned Byte
 
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
 
|- {{Removed}}
 
| Level Type
 
| String (16)
 
| Same as [[#Join Game|Join Game]]
 
|- {{Added}}
 
| Is Debug
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 
|- {{Added}}
 
| Is Flat
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
|- {{added}}
 
  | Copy metadata
 
| Boolean
 
| If false, metadata is reset on the respawned player entity.  Set to true for dimension changes (including the dimension change triggered by sending client status perform respawn to exit the end poem/credits), and false for normal respawns.
 
|}
 
 
 
{{Need Info|Does the new World Name field resolve this same-dimension issue?}}
 
 
 
{{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).
 
 
 
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.}}
 
 
 
==== Entity Properties ====
 
 
 
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| {{change|0x59|0x58}}
+
  | 2
|rowspan="6"| Play
+
  | Red arrow
|rowspan="6"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
  |  
 
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  | 3
|colspan="2"| Int
+
  | Blue arrow
  | Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="4"| Property
+
  | 4
| Key
+
  | White cross
|rowspan="4"| Array
 
| {{Change|String (64)|Identifier}}
 
  | See below
 
 
  |-
 
  |-
  | Value
+
  | 5
  | Double
+
  | Red pointer
| See below
 
 
  |-
 
  |-
  | Number Of Modifiers
+
  | 6
| VarInt
+
  | White circle (off-map players)
| Number of elements in the following array
 
  |-
 
| Modifiers
 
| Array of Modifier Data
 
| See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 
|}
 
 
 
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Key
+
  | 7
  ! Default
+
  | Small white circle (far-off-map players)
! Min
 
! Max
 
! Label
 
 
  |-
 
  |-
  | {{change|generic.maxHealth|generic.max_health}}
+
  | 8
| 20.0
+
  | Mansion
| 0.0
 
| 1024.0
 
  | Max Health
 
 
  |-
 
  |-
  | {{change|generic.followRange|generic.follow_range}}
+
  | 9
| 32.0
+
  | Temple
| 0.0
 
| 2048.0
 
  | Follow Range
 
 
  |-
 
  |-
  | {{change|generic.knockbackResistance|generic.knockback_resistance}}
+
  | 10
| 0.0
+
  | White Banner
| 0.0
 
| 1.0
 
  | Knockback Resistance
 
 
  |-
 
  |-
  | {{change|generic.movementSpeed|generic.movement_speed}}
+
  | 11
| 0.7
+
  | Orange Banner
| 0.0
 
| 1024.0
 
  | Movement Speed
 
 
  |-
 
  |-
  | {{change|generic.attackDamage|generic.attack_damage}}
+
  | 12
| 2.0
+
  | Magenta Banner
| 0.0
 
| 2048.0
 
  | Attack Damage
 
 
  |-
 
  |-
  | {{change|generic.attackSpeed|generic.attack_speed}}
+
  | 13
| 4.0
+
  | Light Blue Banner
| 0.0
 
| 1024.0
 
  | Attack Speed
 
 
  |-
 
  |-
  | {{change|generic.flyingSpeed|generic.flying_speed}}
+
  | 14
| 0.4
+
  | Yellow Banner
| 0.0
 
| 1024.0
 
  | Flying Speed
 
 
  |-
 
  |-
  | generic.armor
+
  | 15
  | 0.0
+
  | Lime Banner
| 0.0
 
| 30.0
 
| Armor
 
 
  |-
 
  |-
  | {{change|generic.armorToughness|generic.armor_toughness}}
+
  | 16
| 0.0
+
  | Pink Banner
| 0.0
 
| 20.0
 
  | Armor Toughness
 
 
  |-
 
  |-
  | {{change|generic.attackKnockback|generic.attack_knockback}}
+
  | 17
| 0.0
+
  | Gray Banner
| 0.0
 
| 5.0
 
  | &mdash;
 
 
  |-
 
  |-
  | generic.luck
+
  | 18
  | 0.0
+
  | Light Gray Banner
| -1024.0
 
| 1024.0
 
| Luck
 
 
  |-
 
  |-
  | {{change|horse.jumpStrength|horse.jump_strength}}
+
  | 19
| 0.7
+
  | Cyan Banner
| 0.0
 
| 2.0
 
  | Jump Strength
 
 
  |-
 
  |-
  | {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
+
  | 20
| 0.0
+
  | Purple Banner
| 0.0
 
| 1.0
 
  | Spawn Reinforcements Chance
 
 
  |-
 
  |-
  | generic.reachDistance
+
  | 21
  | 5.0
+
  | Blue Banner
| 0.0
 
| 1024.0
 
| Player Reach Distance (Forge only)
 
 
  |-
 
  |-
  | forge.swimSpeed
+
  | 22
  | 1.0
+
  | Brown Banner
| 0.0
 
| 1024.0
 
| Swimming Speed (Forge only)
 
|}
 
 
 
Unknown attributes will cause a game crash ([https://bugs.mojang.com/browse/MC-150405 MC-150405]) due to the default minimum being larger than the default value.
 
 
 
''Modifier Data'' structure:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Field Name
+
  | 23
  ! Field Type
+
  | Green Banner
! Notes
 
 
  |-
 
  |-
  | UUID
+
  | 24
| UUID
+
  | Red Banner
  |  
 
 
  |-
 
  |-
  | Amount
+
  | 25
  | Double
+
  | Black Banner
| May be positive or negative
 
 
  |-
 
  |-
  | Operation
+
  | 26
  | Byte
+
  | Treasure marker
| See below
 
 
  |}
 
  |}
  
The operation controls how the base value of the modifier is changed.
+
==== Player Position And Look (clientbound) ====
 +
 
 +
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
 +
 
 +
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
  
* 0: Add/subtract amount
+
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
* 1: Add/subtract amount percent of the current value
 
* 2: Multiply by amount percent
 
  
All of the 0's are applied first, and then the 1's, and then the 2's.
+
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
  
==== Declare Recipes ====
+
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 957: Line 632:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| {{change|0x5B|0x5A}}
+
  |rowspan="8"| {{change|0x34|0x35}}
  |rowspan="4"| Play
+
  |rowspan="8"| Play
  |rowspan="4"| Client
+
  |rowspan="8"| Client
  |colspan="2"| Num Recipes
+
  | X
  |colspan="2"| VarInt
+
  | Double
  | Number of elements in the following array
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
  |rowspan="3"| Recipe
+
  | Y
| Recipe ID
+
  | Double
|rowspan="3"| Array
+
  | Absolute or relative position, depending on Flags.
  | Identifier
 
  |
 
 
  |-
 
  |-
  | Type
+
  | Z
  | String
+
  | Double
  | The recipe type, see below
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
  | Data
+
  | Yaw
  | Optional, varies
+
  | Float
  | Additional data for the recipe.  For some types, there will be no data.
+
  | Absolute or relative rotation on the X axis, in degrees.
|}
 
 
 
Recipe types:
 
 
 
{| class="wikitable"
 
! Type
 
! Description
 
! Data
 
 
  |-
 
  |-
  | <code>crafting_shapeless</code>
+
  | Pitch
  | Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
+
  | Float
  | As follows:
+
  | Absolute or relative rotation on the Y axis, in degrees.
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredient count
 
    | VarInt
 
    | Number of elements in the following array
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>crafting_shaped</code>
+
  | Flags
  | Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
+
  | Byte
| As follows:
+
  | Bit field, see below.
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Width
 
    | VarInt
 
    |
 
    |-
 
    | Height
 
    | VarInt
 
    |
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    | Length is width * height.  Indexed by x + (y * width).
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>crafting_special_armordye</code>
+
  | Teleport ID
| Recipe for dying leather armor
 
|rowspan="13"| None
 
|-
 
| <code>crafting_special_bookcloning</code>
 
| Recipe for copying contents of written books
 
|-
 
| <code>crafting_special_mapcloning</code>
 
| Recipe for copying maps
 
|-
 
| <code>crafting_special_mapextending</code>
 
| Recipe for adding paper to maps
 
|-
 
| <code>crafting_special_firework_rocket</code>
 
| Recipe for making firework rockets
 
|-
 
| <code>crafting_special_firework_star</code>
 
| Recipe for making firework stars
 
|-
 
| <code>crafting_special_firework_star_fade</code>
 
| Recipe for making firework stars fade between multiple colors
 
|-
 
| <code>crafting_special_repairitem</code>
 
| Recipe for repairing items via crafting
 
|-
 
| <code>crafting_special_tippedarrow</code>
 
| Recipe for crafting tipped arrows
 
|-
 
| <code>crafting_special_bannerduplicate</code>
 
| Recipe for copying banner patterns
 
|-
 
| <code>crafting_special_banneraddpattern</code>
 
| Recipe for adding patterns to banners
 
|-
 
| <code>crafting_special_shielddecoration</code>
 
| Recipe for applying a banner's pattern to a shield
 
|-
 
| <code>crafting_special_shulkerboxcoloring</code>
 
| Recipe for recoloring a shulker box
 
|-
 
| <code>smelting</code>
 
| Smelting recipe
 
|rowspan="4"| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.
 
    |-
 
    | Ingredient
 
    | Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |-
 
    | Experience
 
    | Float
 
    |
 
    |-
 
    | Cooking time
 
    | VarInt
 
    |
 
    |}
 
|-
 
| <code>blasting</code>
 
| Blast furnace recipe
 
|-
 
| <code>smoking</code>
 
| Smoker recipe
 
|-
 
| <code>campfire_cooking</code>
 
| Campfire recipe
 
|-
 
| <code>stonecutting</code>
 
| Stonecutter recipe
 
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredient
 
    | Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
|- {{Added}}
 
| <code>smithing</code>
 
| Smithing table recipe
 
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Base
 
    | Ingredient
 
    | First item
 
    |-
 
    | Addition
 
    | Ingredient
 
    | Second item
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
|}
 
 
 
Ingredient is defined as:
 
 
 
{| class="wikitable"
 
! Name
 
! Type
 
! Description
 
|-
 
| Count
 
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID.
  |-
+
  |- {{added}}
  | Items
+
  | Dismount Vehicle
  | Array of [[Slot]]
+
  | Boolean
  | Any item in this array may be used for the recipe.  The count of each item should be 1.
+
  | True if the player should dismount their vehicle.
 
  |}
 
  |}
  
=== Serverbound ===
+
About the Flags field:
  
==== Interact Entity ====
+
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
 
 
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"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="7"| 0x0E
+
  ! Field
  |rowspan="7"| Play
+
  ! Bit
|rowspan="7"| Server
 
| Entity ID
 
| VarInt
 
| The ID of the entity to interact
 
 
  |-
 
  |-
  | Type
+
  | X
  | VarInt Enum
+
  | 0x01
| 0: interact, 1: attack, 2: interact at
 
 
  |-
 
  |-
  | Target X
+
  | Y
  | Optional Float
+
  | 0x02
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Y
+
  | Z
  | Optional Float
+
  | 0x04
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Z
+
  | Y_ROT
  | Optional Float
+
  | 0x08
| Only if Type is interact at
 
 
  |-
 
  |-
  | Hand
+
  | X_ROT
  | Optional VarInt Enum
+
  | 0x10
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
|- {{Added}}
 
| Sneaking
 
| Boolean
 
| If the client is sneaking.
 
 
  |}
 
  |}
  
==== Generate Structure ====
+
==== Resource Pack Send ====  
  
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
+
{| class="wikitable"
 
 
{| class="wikitable" {{added}}
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,243: Line 707:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x0F
+
  |rowspan="3"| {{change|0x38|0x39}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
  |rowspan="3"| Server
+
  |rowspan="3"| Client
  | Location
+
  | URL
  | Position
+
  | String (32767)
  | Block entity location
+
  | The URL to the resource pack.
 
  |-
 
  |-
  | Levels
+
  | Hash
  | VarInt
+
  | String (40)
  | Value of the levels slider/max depth to generate
+
  | A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
  |-
+
  |- {{Added}}
  | Keep Jigsaws
+
  | Forced
 
  | Boolean
 
  | Boolean
  |
+
  | The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
 
  |}
 
  |}
  
==== Player Abilities (serverbound) ====
+
==== Tags ====
 
 
{{change|The latter 2 fields are used to indicate the walking and flying speeds respectively, while the first field is used to determine the value of 4 booleans.}}
 
 
 
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. {{change|All other parameters are ignored by the vanilla server.}}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,269: Line 729:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{change|0x19|0x1A}}
+
  |rowspan="8"| {{change|0x5B|0x5C}}
  |rowspan="3"| Play
+
  |rowspan="8"| Play
  |rowspan="3"| Server
+
  |rowspan="8"| Client
  | Flags
+
  |- {{removed}}
  | Byte
+
  | colspan="2"| Block Tags
  | Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
+
  | colspan="2"| (See below)
 +
| IDs are block IDs
 +
|- {{removed}}
 +
| colspan="2"| Item Tags
 +
| colspan="2"| (See below)
 +
| IDs are item IDs
 
  |- {{removed}}
 
  |- {{removed}}
  | Flying Speed
+
  | colspan="2"| Fluid Tags
  | Float
+
  | colspan="2"| (See below)
  |  
+
  | IDs are fluid IDs
 
  |- {{removed}}
 
  |- {{removed}}
  | Walking Speed
+
  | colspan="2"| Entity Tags
  | Float
+
| colspan="2"| (See below)
 +
| IDs are entity IDs
 +
|- {{added}}
 +
| colspan="2"| Length of the array
 +
  | colspan="2"| VarInt
 
  |  
 
  |  
 +
|- {{added}}
 +
|rowspan="2"| Array of tags
 +
| Tag type
 +
|rowspan="2"| Array
 +
| Identifier
 +
| Tag identifier (Vanilla required tags are <code>minecraft:block</code>, <code>minecraft:item</code>, <code>minecraft:fluid</code>, <code>minecraft:entity_type</code>, and <code>minecraft:game_event</code>)
 +
|-
 +
| Array of Tag
 +
| (See below)
 +
|
 
  |}
 
  |}
  
==== Update Jigsaw Block ====
+
Tags look like:
 
 
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  !colspan="2"| Field Name
! State
+
  !colspan="2"| Field Type
! Bound To
 
! Field Name
 
  ! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| {{Change|0x27|0x28}}
+
  |colspan="2"| Length
  |rowspan="7"| Play
+
  |colspan="2"| VarInt
  |rowspan="7"| Server
+
  | Number of elements in the following array
  | Location
+
  |-
  | Position
+
  |rowspan="3"| Tags
  | Block entity location
+
  | Tag name
  |- {{Removed}}
+
  |rowspan="3"| Array
| Attachment type
 
 
  | Identifier
 
  | Identifier
  |  
+
  |
  |- {{Added}}
+
  |-
  | Name
+
  | Count
  | Identifier
+
  | VarInt
|
+
  | Number of elements in the following array
|- {{Added}}
 
| Target
 
| Identifier
 
|
 
|-
 
| {{Change|Target pool|Pool}}
 
| Identifier
 
  |  
 
 
  |-
 
  |-
  | Final state
+
  | Entries
  | String
+
  | Array of VarInt
  | "Turns into" on the GUI, <code>final_state</code> in NBT
+
  | Numeric ID of the given type (block, item, etc.).
|- {{Added}}
 
| Joint type
 
| String
 
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 
 
  |}
 
  |}
  
==== Entity Equipment ====
+
 
 +
=== Serverbound ===
 +
 
 +
==== Client Settings ====
 +
 
 +
Sent when the player connects, or when settings are changed.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,339: Line 805:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x47
+
  |rowspan="7"| 0x05
  |rowspan="5"| Play
+
  |rowspan="7"| Play
  |rowspan="5"| Client
+
  |rowspan="7"| Server
  |colspan="2"| Entity ID
+
| Locale
  |colspan="2"| VarInt
+
  | String (16)
  | Entity's EID
+
| e.g. <code>en_GB</code>.
  |- {{Removed}}
+
  |-
  |colspan="2"| Slot
+
| View Distance
  |colspan="2"| VarInt Enum
+
  | Byte
  | Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
+
  | Client-side render distance, in chunks.
  |- {{Removed}}
+
  |-
  |colspan="2"| Item
+
| Chat Mode
  |colspan="2"| [[Slot Data|Slot]]
+
  | VarInt Enum
  |  
+
  | 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
 +
  |-
 +
  | Chat Colors
 +
  | Boolean
 +
  | “Colors” multiplayer setting.
 
  |-
 
  |-
  |rowspan="2"| Equipment
+
  | Displayed Skin Parts
| Slot
+
  | Unsigned Byte
|rowspan="2"| Array
+
  | Bit mask, see below.
  | Byte Enum
 
  | Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet).  Also has the top bit set if another entry follows, and otherwise unset if this is the last item in the array.
 
 
  |-
 
  |-
  | Item
+
  | Main Hand
  | [[Slot Data|Slot]]
+
  | VarInt Enum
  |
+
| 0: Left, 1: Right.
 +
|- {{Added}}
 +
| Disable text filtering
 +
| Boolean
 +
  | Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 
  |}
 
  |}
 +
 +
''Displayed Skin Parts'' flags:
 +
 +
* Bit 0 (0x01): Cape enabled
 +
* 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.
  
 
== Handshaking ==
 
== Handshaking ==
Line 1,394: Line 878:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|578|736}})
+
  | See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
Line 1,423: Line 907:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Login Success ====
+
No changes so far.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x02
 
|rowspan="2"| Login
 
|rowspan="2"| Client
 
| UUID
 
| {{Change|String (36)|UUID}}
 
| {{Change|Unlike in other packets, this field contains the UUID as a string with hyphens}}.
 
|-
 
| Username
 
| String (16)
 
|
 
|}
 
 
 
This packet switches the connection state to [[#Play|play]].
 
  
 
=== Serverbound ===
 
=== Serverbound ===

Latest revision as of 00:28, 2 April 2021

This page documents the changes from the last stable Minecraft release (currently 1.16.5, protocol 754) to the current pre-release (currently 21w07a, protocol Snapshot 15). 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
Play clientbound
0x05 Sculk Vibration Signal Pre
0x05 0x06 Entity Animation (clientbound) Current (unchanged)
0x06 0x07 Statistics Current (unchanged)
0x07 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Block Entity Data Current (unchanged)
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 Tab-Complete (clientbound) Current (unchanged)
0x10 0x11 Declare Commands Current (unchanged)
0x11 0x12 Window Confirmation (clientbound) Current (unchanged)
0x12 0x13 Close Window (clientbound) Current (unchanged)
0x13 0x14 Window Items Current (unchanged)
0x14 0x15 Window Property Current (unchanged)
0x15 0x16 Set Slot Current (unchanged)
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Plugin Message (clientbound) Current (unchanged)
0x18 0x19 Named Sound Effect Current (unchanged)
0x19 0x1A Disconnect (play) Current (unchanged)
0x1A 0x1B Entity Status Current (unchanged)
0x1B 0x1C Explosion Current (unchanged)
0x1C 0x1D Unload Chunk Current (unchanged)
0x1D 0x1E Change Game State Current (unchanged)
0x1E 0x1F Open Horse Window Current (unchanged)
0x1F 0x20 Keep Alive (clientbound) Current (unchanged)
0x20 0x21 Chunk Data Current Pre
0x21 0x22 Effect Current (unchanged)
0x22 0x23 Particle Current (unchanged)
0x23 0x24 Update Light Current Pre
0x24 0x25 Join Game Current (unchanged)
0x25 0x26 Map Data Current Pre
0x26 0x27 Trade List Current (unchanged)
0x27 0x28 Entity Position Current (unchanged)
0x28 0x29 Entity Position and Rotation Current (unchanged)
0x29 0x2A Entity Rotation Current (unchanged)
0x2A 0x2B Entity Movement Current (unchanged)
0x2B 0x2C Vehicle Move (clientbound) Current (unchanged)
0x2C 0x2D Open Book Current (unchanged)
0x2D 0x2E Open Window Current (unchanged)
0x2E 0x2F Open Sign Editor Current (unchanged)
0x2F 0x30 Craft Recipe Response Current (unchanged)
0x30 0x31 Player Abilities (clientbound) Current (unchanged)
0x31 0x32 Combat Event Current (unchanged)
0x32 0x33 Player Info Current (unchanged)
0x33 0x34 Face Player Current (unchanged)
0x34 0x35 Player Position And Look (clientbound) Current Pre
0x35 0x36 Unlock Recipes Current (unchanged)
0x36 0x37 Destroy Entities Current (unchanged)
0x37 0x38 Remove Entity Effect Current (unchanged)
0x38 0x39 Resource Pack Send Current Pre
0x39 0x3A Respawn Current (unchanged)
0x3A 0x3B Entity Head Look Current (unchanged)
0x3B 0x3C Multi Block Change 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 Spawn Position Current (unchanged)
0x43 0x44 Display Scoreboard Current (unchanged)
0x44 0x45 Entity Metadata Current (unchanged)
0x45 0x46 Attach Entity Current (unchanged)
0x46 0x47 Entity Velocity Current (unchanged)
0x47 0x48 Entity Equipment Current (unchanged)
0x48 0x49 Set Experience Current (unchanged)
0x49 0x4A Update Health Current (unchanged)
0x4A 0x4B Scoreboard Objective Current (unchanged)
0x4B 0x4C Set Passengers Current (unchanged)
0x4C 0x4D Teams Current (unchanged)
0x4D 0x4E Update Score 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 Pre
Play serverbound
0x05 Client Settings Current Pre
Handshaking serverbound
0x00 Handshake Current Pre

New/modified data types

No changes so far.

Entity Metadata

Warning.png Note that other entities have had metadata shifts due to these changes, not shown here.

Entity

The base class.

Index Type Meaning Default
0 Byte Bit mask Meaning 0
0x01 Is on fire
0x02 Is crouching
0x04 Unused (previously riding)
0x08 Is sprinting
0x10 Is swimming
0x20 Is invisible
0x40 has glowing effect
0x80 Is flying with an elytra
1 VarInt Air ticks 300
2 OptChat Custom name empty
3 Boolean Is custom name visible false
4 Boolean Is silent false
5 Boolean Has no gravity false
6 Pose Pose STANDING
7 VarInt Ticks frozen in powdered snow 0

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Sculk Vibration Signal

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Source Position Position Source position for the vibration.
Destination Identifier Identifier Identifier of the destination codec type.
Destination Varies Vanilla default destinations are a block position encoded as a Position for "block" or an entity id encoded as a VarInt for "entity".
Arrival Ticks VarInt Ticks for the signal to arrive at the destination.

This packet shows a permanent particle.

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 dimension 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
0x20 0x21 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).
Bit Mask Length VarInt Length of the following array
Primary Bit Mask Array of Long BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
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 length Optional VarInt Size of the following array; should always be 1024. Not present if full chunk is false.
Biomes Optional Array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Not present if full chunk is false. See Chunk Format § Biomes.
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.

The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.

New format, 5 bits per block, containing the following references to blocks in a palette (not shown): 122344566480743131516914101202

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x24 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask VarInt Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
Empty Sky Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their sky light values. If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the sky light arrays.
Empty Block Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their block light values. If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the block light arrays.
Length 1 VarInt Length of the following array
Sky Light Mask Array of Long BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
Length 2 VarInt Length of the following array
Block Light Mask Array of Long BitSet containing bits for each sections in the world + 2, same order as sky light
Length 3 VarInt Length of the following array
Empty Sky Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
Length 4 VarInt Length of the following array
Empty Block Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
Sky Light array count VarInt Number of entries in the following array
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
Block Light array count VarInt Number of entries in the following array
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.


Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x26 Play Client Map ID VarInt Map ID of the map being modified
Scale 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)
Tracking Position Boolean Specifies whether player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Tracking Position Boolean Specifies whether player and item frame icons are shown
Icon Count VarInt Number of elements in the following array. Only present if "Tracking Position" is true.
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned Byte Number of columns updated
Rows Optional Byte Only if Columns is more than 0; number of rows updated
X Optional Byte Only if Columns is more than 0; x offset of the westernmost column
Z Optional Byte Only if Columns is more than 0; z offset of the northernmost row
Length Optional VarInt Only if Columns is more than 0; length of the following array
Data Optional Array of Unsigned Byte Only if Columns is more than 0; see Map item format

For icons, a direction of 0 is a vertical icon and increments by 22.5° (360/16).

Types are based off of rows and columns in map_icons.png:

Icon type Result
0 White arrow (players)
1 Green arrow (item frames)
2 Red arrow
3 Blue arrow
4 White cross
5 Red pointer
6 White circle (off-map players)
7 Small white circle (far-off-map players)
8 Mansion
9 Temple
10 White Banner
11 Orange Banner
12 Magenta Banner
13 Light Blue Banner
14 Yellow Banner
15 Lime Banner
16 Pink Banner
17 Gray Banner
18 Light Gray Banner
19 Cyan Banner
20 Purple Banner
21 Blue Banner
22 Brown Banner
23 Green Banner
24 Red Banner
25 Black Banner
26 Treasure marker

Player Position And Look (clientbound)

Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.

If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.

Also if the fixed-point number of X or Z is set greater than 3.2E7D the client will be kicked for “Illegal position”.

Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

Packet ID State Bound To Field Name Field Type Notes
0x34 0x35 Play Client X Double Absolute or relative position, depending on Flags.
Y Double Absolute or relative position, depending on Flags.
Z Double Absolute or relative position, depending on Flags.
Yaw Float Absolute or relative rotation on the X axis, in degrees.
Pitch Float Absolute or relative rotation on the Y axis, in degrees.
Flags Byte Bit field, see below.
Teleport ID VarInt Client should confirm this packet with Teleport Confirm containing the same Teleport ID.
Dismount Vehicle Boolean True if the player should dismount their vehicle.

About the Flags field:

<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
Field Bit
X 0x01
Y 0x02
Z 0x04
Y_ROT 0x08
X_ROT 0x10

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 0x39 Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
Forced Boolean The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.

Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x5C Play Client
Block Tags (See below) IDs are block IDs
Item Tags (See below) IDs are item IDs
Fluid Tags (See below) IDs are fluid IDs
Entity Tags (See below) IDs are entity IDs
Length of the array VarInt
Array of tags Tag type Array Identifier Tag identifier (Vanilla required tags are minecraft:block, minecraft:item, minecraft:fluid, minecraft:entity_type, and minecraft:game_event)
Array of Tag (See below)

Tags look like:

Field Name Field Type Notes
Length VarInt Number of elements in the following array
Tags Tag name Array Identifier
Count VarInt Number of elements in the following array
Entries Array of VarInt Numeric ID of the given type (block, item, etc.).


Serverbound

Client Settings

Sent when the player connects, or when settings are changed.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Locale String (16) e.g. en_GB.
View Distance Byte Client-side render distance, in chunks.
Chat Mode VarInt Enum 0: enabled, 1: commands only, 2: hidden. See processing chat for more information.
Chat Colors Boolean “Colors” multiplayer setting.
Displayed Skin Parts Unsigned Byte Bit mask, see below.
Main Hand VarInt Enum 0: Left, 1: Right.
Disable text filtering Boolean Disables filtering of text on signs and written book titles. Currently always true (i.e. the filtering is disabled)

Displayed Skin Parts flags:

  • Bit 0 (0x01): Cape enabled
  • 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.

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 754 Snapshot 15)
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.