Difference between revisions of "Pre-release protocol"

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(Chunk light packet changes)
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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|1.16.2-pre3, protocol 748]]). 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|1.16.4, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|20w49a, protocol 1073741832]]). 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"| Play clientbound
 +
{{PacketList|0x05|Sculk Sensor Signal|rel=added}}
 +
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
 +
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
 +
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
 +
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
 +
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x0F|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x11}}|Declare Commands|pre=unchanged}}
 +
{{PacketList|{{change|0x11|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
 +
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Update Light}}
 +
{{PacketList|{{change|0x24|0x25}}|Join Game|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Map Data}}
 +
{{PacketList|{{change|0x26|0x27}}|Trade List|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Entity Movement|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Combat Event|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Player Info|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Face Player|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Player Position And Look (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Unlock Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Destroy Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x38}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x39}}|Resource Pack Send}}
 +
{{PacketList|{{change|0x39|0x3A}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3B}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3C}}|Multi Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3F}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x40}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x43}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x44}}|Display Scoreboard|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x45}}|Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x46}}|Attach Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x47}}|Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x48}}|Entity Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x49}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4A}}|Update Health|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4B}}|Scoreboard Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4C}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4D}}|Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4E}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x51}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x52}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x53}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x54}}|Player List Header And Footer|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|pre=unchanged}}
 
  |-
 
  |-
 
!colspan="4"| Handshaking serverbound
 
!colspan="4"| Handshaking serverbound
 
{{PacketList|0x00|Handshake}}
 
{{PacketList|0x00|Handshake}}
|-
 
!colspan="4"| Play clientbound
 
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
 
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
 
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
 
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
 
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
 
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
 
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
 
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
 
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
 
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
 
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
 
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
 
{{PacketList|{{change|0x11|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
 
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
 
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
 
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
 
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
 
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
 
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
 
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
 
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
 
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
 
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
 
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
 
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
 
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
 
{{PacketList|{{change|0x25|0x23}}|Update Light}}
 
{{PacketList|{{change|0x26|0x24}}|Join Game}}
 
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
 
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
 
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
 
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
 
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
 
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
 
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
 
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
 
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
 
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
 
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
 
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
 
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
 
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
 
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
 
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
 
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
 
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
 
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
 
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
 
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
 
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
 
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
 
{{PacketList|0x47|Entity Equipment}}
 
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
 
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
 
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
 
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
 
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
 
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
 
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
 
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
 
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
 
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
 
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
 
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
 
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
 
|-
 
!colspan="4"| Play serverbound
 
{{PacketList|0x0E|Interact Entity}}
 
{{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|0x1D|Recipe Book Data|pre=removed}}
 
{{PacketList|0x1E|Set Displayed Recipe|rel=added}}
 
{{PacketList|0x1F|Set Recipe Book State|rel=added}}
 
{{PacketList|{{change|0x1E|0x20}}|Name Item|pre=unchanged}}
 
{{PacketList|{{change|0x1F|0x21}}|Resource Pack Status|pre=unchanged}}
 
{{PacketList|{{change|0x20|0x22}}|Advancement Tab|pre=unchanged}}
 
{{PacketList|{{change|0x21|0x23}}|Select Trade|pre=unchanged}}
 
{{PacketList|{{change|0x22|0x24}}|Set Beacon Effect|pre=unchanged}}
 
{{PacketList|{{change|0x23|0x25}}|Held Item Change (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x24|0x26}}|Update Command Block|pre=unchanged}}
 
{{PacketList|{{change|0x25|0x27}}|Update Command Block Minecart|pre=unchanged}}
 
{{PacketList|{{change|0x26|0x28}}|Creative Inventory Action|pre=unchanged}}
 
{{PacketList|{{change|0x27|0x29}}|Update Jigsaw Block}}
 
{{PacketList|{{change|0x28|0x2A}}|Update Structure Block|pre=unchanged}}
 
{{PacketList|{{change|0x29|0x2B}}|Update Sign|pre=unchanged}}
 
{{PacketList|{{change|0x2A|0x2C}}|Animation (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x2B|0x2D}}|Spectate|pre=unchanged}}
 
{{PacketList|{{change|0x2C|0x2E}}|Player Block Placement|pre=unchanged}}
 
{{PacketList|{{change|0x2D|0x2F}}|Use Item|pre=unchanged}}
 
|-
 
!colspan="4"| Login clientbound
 
{{PacketList|0x02|Login Success}}
 
 
  |}
 
  |}
  
Line 153: Line 120:
 
{{#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 186: Line 132:
 
  ! 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|}}
+
  | 0x08
| VarInt
+
  | Is sprinting
|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|}}
+
  | 0x10
| VarInt
+
  | Is swimming
|colspan="2"| Loyalty level (enchantment)
 
  | 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x20
| Boolean
+
  | Is invisible
|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|}}
+
  | 0x40
| VarInt
+
  | has glowing effect
|colspan="2"| Total time to "boost" with warped fungus on a stick for
 
  | 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x80
| Boolean
+
  | Is flying with an {{Minecraft Wiki|elytra}}
  |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|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | VarInt
  |colspan="2"| Has saddle
+
  |colspan="2"| Air ticks
  | false
+
  | 300
|}
 
 
 
=== Hoglin ===
 
 
 
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | OptChat
  |colspan="2"| Is immune to zombification
+
  |colspan="2"| Custom name
  | false
+
  | empty
|}
 
 
 
=== Zoglin ===
 
 
 
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is baby
+
  |colspan="2"| Is custom name visible
 
  | false
 
  | false
|}
 
 
=== Base Piglin ===
 
 
{{Metadata inherit|Base Piglin|inherits=Monster|start_at=15}}
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is immune to zombification
+
  |colspan="2"| Is silent
 
  | false
 
  | false
|}
 
 
=== Piglin ===
 
 
{{Metadata inherit|Piglin|inherits=Base Piglin}}
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is baby
+
  |colspan="2"| Has no gravity
 
  | false
 
  | false
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | Pose
  |colspan="2"| Is charging crossbow
+
  |colspan="2"| Pose
  | false
+
  | STANDING
|-
+
  |- {{added}}
| {{Metadata id|}}
+
  | {{Metadata id|added}}
| Boolean
 
|colspan="2"| Is dancing
 
| false
 
|}
 
 
 
=== Piglin Brute ===
 
 
 
{{Metadata inherit|Piglin Brute|inherits=Base Piglin}}
 
 
 
No additional metadata.
 
 
 
=== Wolf ===
 
 
 
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Is begging
 
| false
 
|-
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
 
| 14 (Red)
 
  |- {{Added}}
 
  | {{Metadata id|}}
 
 
  | VarInt
 
  | VarInt
  |colspan="2"| Anger time
+
  |colspan="2"| Ticks frozen in powdered snow
 
  | 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 408: Line 214:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Chat Message (clientbound) ====  
+
==== Sculk Sensor 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.
+
{| class="wikitable" {{Added}}
 
 
{{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"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 422: Line 224:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{change|0x0F|0x0E}}
+
  |rowspan="4"| 0x05
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Client
+
  |rowspan="4"| Client
  | JSON Data
+
  | Position
  | [[Chat]]
+
| Position
  | Limited to 32767 bytes
+
|
 +
|-
 +
|
 +
| Identifier
 +
|
 +
|-
 +
|
 +
  | Unknown
 +
  | Varies, may be a different data structure in different contexts
 
  |-
 
  |-
  | Position
+
  |
  | Byte
+
  | VarInt
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
+
  |
|- {{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.
 
 
  |}
 
  |}
  
Line 444: Line 250:
 
{{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 454: Line 260:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x22|0x20}}
+
  |rowspan="11"| {{change|0x20|0x21}}
 
  |rowspan="11"| Play
 
  |rowspan="11"| Play
 
  |rowspan="11"| Client
 
  |rowspan="11"| Client
Line 464: Line 270:
 
  | 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
Line 476: Line 282:
 
  | [[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.
  |- {{Added}}
+
  |-  
 
  | Biomes length
 
  | Biomes length
 
  | Optional VarInt
 
  | Optional VarInt
Line 482: Line 288:
 
  |-
 
  |-
 
  | Biomes
 
  | Biomes
  | Optional array of {{change|Integer|VarInt}}
+
  | Optional array of VarInt
  | {{change|1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.|Possibly something else.}} Not present if full chunk is false.
+
  | <s>1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.</s>Possibly something else.  Not present if full chunk is false.
 
  |-  
 
  |-  
 
  | Size
 
  | Size
Line 504: Line 310:
 
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 518: Line 331:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x25|0x23}}
+
  |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 559: Line 407:
 
  | 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 571: Line 423:
 
  |}
 
  |}
  
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 581: Line 432:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="17"| {{change|0x26|0x24}}
+
  |rowspan="18"| {{change|0x25|0x26}}
  |rowspan="17"| Play
+
  |rowspan="18"| Play
  |rowspan="17"| 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
 
  |-
 
  |-
  | Is hardcore
+
  |colspan="2"| Scale
  | Boolean
+
|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)
 +
|- {{removed}}
 +
|colspan="2"| Tracking Position
 +
  |colspan="2"| Boolean
 +
  | Specifies whether player and item frame icons are shown
 
  |-
 
  |-
  | Gamemode
+
  |colspan="2"| Locked
| Unsigned Byte
+
  |colspan="2"| Boolean
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. {{change|Bit 3 (0x8) is the hardcore flag.}}
+
  | True if the map has been locked in a cartography table
|- {{Added}}
+
  |-  
| Previous Gamemode
+
  |- {{added}}
  | Unsigned Byte
+
  |colspan="2"| Tracking Position
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
+
  |colspan="2"| Boolean
|- {{Added}}
+
  | Specifies whether player and item frame icons are shown
| 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]]
 
  | The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
 
 
  |-
 
  |-
  | Dimension
+
  |colspan="2"| Icon Count
  | {{change|Int Enum|[[NBT|NBT Tag Compound]]}}
+
  |colspan="2"| VarInt
  | {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent before this}}
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
|- {{Added}}
 
| World Name
 
| Identifier
 
| Name of the world being spawned into
 
 
  |-
 
  |-
  | Hashed seed
+
  |rowspan="6"| Icon
| Long
+
  | Type
| First 8 bytes of the SHA-256 hash of the world's seed.
+
  |rowspan="6"| Array
|-
+
  | VarInt enum
| Max Players
+
  | See below
| Unsigned Byte
 
| Was once used by the client to draw the player list, but now is ignored
 
|- {{Removed}}
 
| 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 {{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
 
|}
 
 
 
{{Need Info|The format has changed in 20w28a}}
 
 
 
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
 
|colspan="2"| Is it a standard overworld like dimension
 
| 1: true, 0: false
 
|-
 
| ambient_light
 
| Float
 
|colspan="2"| Ambient light
 
| 0.0 to 1.0
 
|-
 
| has_ceiling
 
| Byte
 
|colspan="2"| Does the dimension have blocks on top ? Like the nether
 
| 1: true, 0: false
 
|-
 
| has_skylight
 
| Byte
 
|colspan="2"| Does the dimension have natural sky light
 
| 1: true, 0: false
 
|-
 
| fixed_time
 
| Long
 
|colspan="2"| Set fixed minecraft clock time
 
| 0 to 12000
 
|-
 
| shrunk
 
| Byte
 
|colspan="2"| Used to set how Cords are scaled for the dimension.
 
| 1: true, 0: false
 
|-
 
| ultrawarm
 
| Byte
 
|colspan="2"| Sets if Ice and Water evaporate. (Like in the nether)
 
  | 1: true, 0: false
 
 
  |-
 
  |-
  | has_raids
+
  | X
 
  | Byte
 
  | Byte
  |colspan="2"| ?
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
| 1: true, 0: false
 
 
  |-
 
  |-
  | respawn_anchor_works
+
  | Z
 
  | Byte
 
  | Byte
  |colspan="2"| Wether or not respawn anchor can be used
+
  | Map coordinates: -128 for highest, +127 for lowest
| 1: true, 0: false
 
 
  |-
 
  |-
  | bed_works
+
  | Direction
 
  | Byte
 
  | Byte
  |colspan="2"| Wether or not beds can be used
+
  | 0-15
| 1: true, 0: false
 
|-
 
| piglin_safe
 
| Byte
 
|colspan="2"| ?
 
| 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:..."
 
|}
 
 
 
==== Unlock Recipes ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="14"| {{Change|0x37|0x35}}
 
|rowspan="14"| Play
 
|rowspan="14"| Client
 
|-
 
| Action
 
| VarInt
 
| 0: init, 1: add, 2: remove
 
 
  |-
 
  |-
  | Crafting Recipe Book Open
+
  | Has Display Name
 
  | Boolean
 
  | Boolean
| If true, then the crafting recipe book will be open when the player opens its inventory.
 
|-
 
| Crafting Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|-
 
| Smelting Recipe Book Open
 
| Boolean
 
| If true, then the smelting recipe book will be open when the player opens its inventory.
 
|-
 
| Smelting Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|- {{added}}
 
| Blast Furance Recipe Book Open
 
| Boolean
 
| If true, then the blast furnace recipe book will be open when the player opens its inventory.
 
|- {{added}}
 
| Blast Furance Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|- {{added}}
 
| Smoker Recipe Book Open
 
| Boolean
 
| If true, then the smoker recipe book will be open when the player opens its inventory.
 
|- {{added}}
 
| Smoker Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|-
 
| Array size 1
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Recipe IDs
 
| Array of Identifier
 
 
  |
 
  |
 
  |-
 
  |-
  | Array size 2
+
  | Display Name
  | Optional VarInt
+
  | Optional [[Chat]]
  | Number of elements in the following array, only present if mode is 0 (init)
+
  | Only present if previous Boolean is true
  |-
+
  |-  
  | Recipe IDs
+
  |colspan="2"| Columns
| Optional Array of Identifier, only present if mode is 0 (init)
+
  |colspan="2"| Unsigned Byte
|
+
  | Number of columns updated
  |}
 
Action:
 
* 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification.
 
* 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
 
* 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.
 
 
 
==== 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.
 
 
 
{| class="wikitable"
 
  ! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="10"| {{Change|0x3B|0x39}}
+
  |colspan="2"| Rows
  |rowspan="10"| Play
+
  |colspan="2"| Optional Byte
  |rowspan="10"| Client
+
  | Only if Columns is more than 0; number of rows updated
| Dimension
 
| {{change|Int Enum|[[NBT|NBT Tag Compound]]}}
 
| {{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
+
  |colspan="2"| X
| Long
+
  |colspan="2"| Optional Byte
  | First 8 bytes of the SHA-256 hash of the world's seed.
+
  | Only if Columns is more than 0; x offset of the westernmost column
|- {{Added}}
 
| Gamemode
 
| Unsigned Byte
 
| 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.}}
 
 
 
==== Multi Block Change ====
 
 
 
{| class="wikitable" {{added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| {{Change|0x10|0x3B}}
+
  |colspan="2"| Z
|rowspan="4"| Play
+
  |colspan="2"| Optional Byte
  |rowspan="4"| Client
+
  | Only if Columns is more than 0; z offset of the northernmost row
  |
 
| Long
 
| Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 
|- {{added}}
 
|
 
| Boolean
 
|
 
 
  |-
 
  |-
  | Array size
+
  |colspan="2"| Length
  | VarInt
+
  |colspan="2"| Optional VarInt
  | Number of elements in the following array
+
  | Only if Columns is more than 0; length of the following array
 
  |-
 
  |-
  |  
+
  |colspan="2"| Data
  | Array of VarLong
+
  |colspan="2"| Optional Array of Unsigned Byte
  | Each entry is composed of the block id, shifted right by 12, and the relative block position in the chunk section (4 bits for x, z, and y, from left to right).
+
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 
  |}
 
  |}
  
==== Entity Properties ====
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
  
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
+
Types are based off of rows and columns in <code>map_icons.png</code>:
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| {{change|0x59|0x58}}
+
  ! Icon type
  |rowspan="6"| Play
+
  ! Result
|rowspan="6"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
|
 
 
  |-
 
  |-
|colspan="2"| Number Of Properties
+
  | 0
|colspan="2"| Int
+
  | White arrow (players)
| Number of elements in the following array
 
|-
 
|rowspan="4"| Property
 
| Key
 
|rowspan="4"| Array
 
| {{Change|String (64)|Identifier}}
 
| See below
 
|-
 
| Value
 
| Double
 
| See below
 
|-
 
| Number Of Modifiers
 
| VarInt
 
| 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
 
! Default
 
! Min
 
! Max
 
! Label
 
|-
 
| {{change|generic.maxHealth|generic.max_health}}
 
| 20.0
 
| 0.0
 
| 1024.0
 
| Max Health
 
|-
 
| {{change|generic.followRange|generic.follow_range}}
 
| 32.0
 
| 0.0
 
| 2048.0
 
| Follow Range
 
|-
 
| {{change|generic.knockbackResistance|generic.knockback_resistance}}
 
| 0.0
 
| 0.0
 
| 1.0
 
| Knockback Resistance
 
|-
 
| {{change|generic.movementSpeed|generic.movement_speed}}
 
| 0.7
 
| 0.0
 
| 1024.0
 
| Movement Speed
 
|-
 
| {{change|generic.attackDamage|generic.attack_damage}}
 
| 2.0
 
| 0.0
 
| 2048.0
 
| Attack Damage
 
|-
 
| {{change|generic.attackSpeed|generic.attack_speed}}
 
| 4.0
 
| 0.0
 
| 1024.0
 
| Attack Speed
 
|-
 
| {{change|generic.flyingSpeed|generic.flying_speed}}
 
| 0.4
 
| 0.0
 
| 1024.0
 
| Flying Speed
 
|-
 
| generic.armor
 
| 0.0
 
| 0.0
 
| 30.0
 
| Armor
 
|-
 
| {{change|generic.armorToughness|generic.armor_toughness}}
 
| 0.0
 
  | 0.0
 
  | 20.0
 
| Armor Toughness
 
|-
 
| {{change|generic.attackKnockback|generic.attack_knockback}}
 
| 0.0
 
| 0.0
 
| 5.0
 
| &mdash;
 
|-
 
| generic.luck
 
| 0.0
 
| -1024.0
 
| 1024.0
 
| Luck
 
|-
 
| {{change|horse.jumpStrength|horse.jump_strength}}
 
| 0.7
 
| 0.0
 
| 2.0
 
| Jump Strength
 
|-
 
| {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
 
| 0.0
 
| 0.0
 
| 1.0
 
| Spawn Reinforcements Chance
 
|-
 
| generic.reachDistance
 
| 5.0
 
| 0.0
 
| 1024.0
 
| Player Reach Distance (Forge only)
 
|-
 
| forge.swimSpeed
 
| 1.0
 
| 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
 
! Field Type
 
! Notes
 
|-
 
| UUID
 
| UUID
 
|
 
|-
 
| Amount
 
| Double
 
| May be positive or negative
 
|-
 
| Operation
 
| Byte
 
| See below
 
|}
 
 
 
The operation controls how the base value of the modifier is changed.
 
 
 
* 0: Add/subtract amount
 
* 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.
 
 
 
==== Declare Recipes ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="4"| {{change|0x5B|0x5A}}
 
|rowspan="4"| Play
 
|rowspan="4"| Client
 
|colspan="2"| Num Recipes
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
|-
 
|rowspan="3"| Recipe
 
| Recipe ID
 
|rowspan="3"| Array
 
| Identifier
 
|
 
|-
 
| Type
 
| String
 
| The recipe type, see below
 
|-
 
| Data
 
| Optional, varies
 
| Additional data for the recipe.  For some types, there will be no data.
 
|}
 
 
 
Recipe types:
 
 
 
{| class="wikitable"
 
! Type
 
! Description
 
! Data
 
|-
 
| <code>crafting_shapeless</code>
 
| Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
 
| 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 count
 
    | VarInt
 
    | Number of elements in the following array
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
|-
 
| <code>crafting_shaped</code>
 
| Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
 
| As follows:
 
  {| 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>
+
  | 1
  | Recipe for dying leather armor
+
  | Green arrow (item frames)
|rowspan="13"| None
 
 
  |-
 
  |-
  | <code>crafting_special_bookcloning</code>
+
  | 2
  | Recipe for copying contents of written books
+
  | Red arrow
 
  |-
 
  |-
  | <code>crafting_special_mapcloning</code>
+
  | 3
  | Recipe for copying maps
+
  | Blue arrow
 
  |-
 
  |-
  | <code>crafting_special_mapextending</code>
+
  | 4
  | Recipe for adding paper to maps
+
  | White cross
 
  |-
 
  |-
  | <code>crafting_special_firework_rocket</code>
+
  | 5
  | Recipe for making firework rockets
+
  | Red pointer
 
  |-
 
  |-
  | <code>crafting_special_firework_star</code>
+
  | 6
  | Recipe for making firework stars
+
  | White circle (off-map players)
 
  |-
 
  |-
  | <code>crafting_special_firework_star_fade</code>
+
  | 7
  | Recipe for making firework stars fade between multiple colors
+
  | Small white circle (far-off-map players)
 
  |-
 
  |-
  | <code>crafting_special_repairitem</code>
+
  | 8
  | Recipe for repairing items via crafting
+
  | Mansion
 
  |-
 
  |-
  | <code>crafting_special_tippedarrow</code>
+
  | 9
  | Recipe for crafting tipped arrows
+
  | Temple
 
  |-
 
  |-
  | <code>crafting_special_bannerduplicate</code>
+
  | 10
  | Recipe for copying banner patterns
+
  | White Banner
 
  |-
 
  |-
  | <code>crafting_special_banneraddpattern</code>
+
  | 11
  | Recipe for adding patterns to banners
+
  | Orange Banner
 
  |-
 
  |-
  | <code>crafting_special_shielddecoration</code>
+
  | 12
  | Recipe for applying a banner's pattern to a shield
+
  | Magenta Banner
 
  |-
 
  |-
  | <code>crafting_special_shulkerboxcoloring</code>
+
  | 13
  | Recipe for recoloring a shulker box
+
  | Light Blue Banner
 
  |-
 
  |-
  | <code>smelting</code>
+
  | 14
  | Smelting recipe
+
  | Yellow Banner
|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>
+
  | 15
  | Blast furnace recipe
+
  | Lime Banner
|-
 
| <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
+
  | 16
  | VarInt
+
  | Pink Banner
| Number of elements in the following array
 
 
  |-
 
  |-
  | Items
+
  | 17
  | Array of [[Slot]]
+
  | Gray Banner
| Any item in this array may be used for the recipe.  The count of each item should be 1.
 
|}
 
 
 
=== Serverbound ===
 
 
 
==== Interact 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="7"| 0x0E
+
  | 18
|rowspan="7"| Play
+
  | Light Gray Banner
|rowspan="7"| Server
 
| Entity ID
 
| VarInt
 
  | The ID of the entity to interact
 
 
  |-
 
  |-
  | Type
+
  | 19
  | VarInt Enum
+
  | Cyan Banner
| 0: interact, 1: attack, 2: interact at
 
 
  |-
 
  |-
  | Target X
+
  | 20
  | Optional Float
+
  | Purple Banner
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Y
+
  | 21
  | Optional Float
+
  | Blue Banner
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Z
+
  | 22
  | Optional Float
+
  | Brown Banner
| Only if Type is interact at
 
 
  |-
 
  |-
  | Hand
+
  | 23
  | Optional VarInt Enum
+
  | Green Banner
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
|- {{Added}}
 
| Sneaking
 
| Boolean
 
| If the client is sneaking.
 
|}
 
 
 
==== Generate Structure ====
 
 
 
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 
 
 
{| class="wikitable" {{added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x0F
+
  | 24
|rowspan="3"| Play
+
  | Red Banner
|rowspan="3"| Server
 
| Location
 
| Position
 
  | Block entity location
 
 
  |-
 
  |-
  | Levels
+
  | 25
  | VarInt
+
  | Black Banner
| Value of the levels slider/max depth to generate
 
 
  |-
 
  |-
  | Keep Jigsaws
+
  | 26
| Boolean
+
  | Treasure marker
  |
 
 
  |}
 
  |}
  
==== Player Abilities (serverbound) ====
 
  
{{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.}}
+
==== Resource Pack Send ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,400: Line 618:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{change|0x19|0x1A}}
+
  |rowspan="3"| {{change|0x38|0x39}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
  |rowspan="3"| Server
+
  |rowspan="3"| Client
  | Flags
+
  | URL
  | Byte
+
  | String (32767)
| Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
+
  | The URL to the resource pack.
  |- {{removed}}
 
| Flying Speed
 
| Float
 
|
 
|- {{removed}}
 
| Walking Speed
 
| Float
 
|
 
|}
 
 
 
==== Set Displayed Recipe ====
 
 
 
Replaces Recipe Book Data, type 0.
 
 
 
{| class="wikitable" {{Added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x1E
+
  | Hash
  |rowspan="1"| Play
+
  | String (40)
  |rowspan="1"| Server
+
  | 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
| Recipe ID
+
|- {{Added}}
| Identifier
+
  | Forced
|
 
|}
 
 
 
==== Set Recipe Book State ====
 
 
 
Replaces Recipe Book Data, type 1.
 
 
 
{| class="wikitable" {{Added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| 0x1F
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Book ID
 
| VarInt enum
 
| 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
 
|-
 
  | Book Open
 
 
  | Boolean
 
  | Boolean
  |
+
  | The notchian client will be forced to use the ressource pack from the server. If they decline they will be kicked from the server.
|-
 
| Filter Active
 
| Boolean
 
|
 
 
  |}
 
  |}
  
==== Update Jigsaw Block ====
 
  
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
+
=== Serverbound ===
  
{| class="wikitable"
+
No changes so far.
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="7"| {{Change|0x27|0x28}}
 
|rowspan="7"| Play
 
|rowspan="7"| Server
 
| Location
 
| Position
 
| Block entity location
 
|- {{Removed}}
 
| Attachment type
 
| Identifier
 
|
 
|- {{Added}}
 
| Name
 
| Identifier
 
|
 
|- {{Added}}
 
| Target
 
| Identifier
 
|
 
|-
 
| {{Change|Target pool|Pool}}
 
| Identifier
 
|
 
|-
 
| Final state
 
| String
 
| "Turns into" on the GUI, <code>final_state</code> in NBT
 
|- {{Added}}
 
| Joint type
 
| String
 
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 
|}
 
 
 
==== Entity Equipment ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="5"| 0x47
 
|rowspan="5"| Play
 
|rowspan="5"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
| Entity's EID
 
|- {{Removed}}
 
|colspan="2"| Slot
 
|colspan="2"| VarInt Enum
 
| Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
 
|- {{Removed}}
 
|colspan="2"| Item
 
|colspan="2"| [[Slot Data|Slot]]
 
|
 
|-
 
|rowspan="2"| Equipment
 
| Slot
 
|rowspan="2"| Array
 
| 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
 
| [[Slot Data|Slot]]
 
|
 
|}
 
  
 
== Handshaking ==
 
== Handshaking ==
Line 1,569: Line 664:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|578|748}})
+
  | See [[protocol version numbers]] (currently {{change|754|1073741832}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
Line 1,598: Line 693:
 
=== 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 ===

Revision as of 20:56, 4 December 2020

This page documents the changes from the last stable Minecraft release (currently 1.16.4, protocol 754) to the current pre-release (currently 20w49a, protocol 1073741832). 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 Sensor 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 (unchanged)
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 (unchanged)
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 Sensor Signal

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Position Position
Identifier
Unknown Varies, may be a different data structure in different contexts
VarInt

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).
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. 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.Possibly something else. 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.

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


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 ressource pack from the server. If they decline they will be kicked from the server.


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 754 1073741832)
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.