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|1.16.4-pre2, protocol 1073741826]]). 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|0x10|Clear Titles|rel=added}}
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x11}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
+
{{PacketList|{{change|0x10|0x12}}|Declare Commands|pre=unchanged}}
{{PacketList|{{change|0x11|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
+
{{PacketList|0x11|Window Confirmation (clientbound)|pre=removed}}
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
+
{{PacketList|0x20|Initialize World Border|rel=added}}
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x21}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x22}}|Chunk Data}}
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
+
{{PacketList|{{change|0x21|0x23}}|Effect|pre=unchanged}}
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x24}}|Particle|pre=unchanged}}
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x25}}|Update Light}}
{{PacketList|{{change|0x25|0x23}}|Update Light}}
+
{{PacketList|{{change|0x24|0x26}}|Join Game|pre=unchanged}}
{{PacketList|{{change|0x26|0x24}}|Join Game}}
+
{{PacketList|{{change|0x25|0x27}}|Map Data}}
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x28}}|Trade List|pre=unchanged}}
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x29}}|Entity Position|pre=unchanged}}
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x2A}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2B}}|Entity Rotation|pre=unchanged}}
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
+
{{PacketList|0x2A|Entity Movement|pre=removed}}
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|0x31|Combat Event|pre=removed}}
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
+
{{PacketList|0x32|End Combat Event|rel=added}}
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
+
{{PacketList|0x33|Enter Combat Event|rel=added}}
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
+
{{PacketList|0x34|Death Combat Event|rel=added}}
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x35}}|Player Info|pre=unchanged}}
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
+
{{PacketList|{{change|0x33|0x36}}|Face Player|pre=unchanged}}
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|0x36|Destroy Entities}}|rel=removed}}
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x37}}|Player Position And Look (clientbound)}}
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x38}}|Unlock Recipes|pre=unchanged}}
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
+
{{PacketList|0x39|Destroy Entity}}|rel=added}}
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x3A}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
+
{{PacketList|{{change|0x38|0x3B}}|Resource Pack Send}}
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x3C}}|Respawn|pre=unchanged}}
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x3A|0x3D}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x3B|0x3E}}|Multi Block Change|pre=unchanged}}
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x3C|0x3F}}|Select Advancement Tab|pre=unchanged}}
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
+
{{PacketList|0x40|Action Bar|rel=added}}
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
+
{{PacketList|0x41|World Border Center|rel=added}}
{{PacketList|0x47|Entity Equipment}}
+
{{PacketList|0x42|World Border Lerp Size|rel=added}}
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
+
{{PacketList|0x43|World Border Size |rel=added}}
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
+
{{PacketList|0x44|World Border Warning Delay|rel=added}}
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
+
{{PacketList|0x45|World Border Warning Reach|rel=added}}
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x3E|0x46}}|Camera|pre=unchanged}}
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x3F|0x47}}|Held Item Change (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
+
{{PacketList|{{change|0x40|0x48}}|Update View Position|pre=unchanged}}
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x41|0x49}}|Update View Distance|pre=unchanged}}
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x4A}}|Spawn Position|pre=unchanged}}
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x43|0x4B}}|Display Scoreboard|pre=unchanged}}
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x44|0x4C}}|Entity Metadata|pre=unchanged}}
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x45|0x4D}}|Attach Entity|pre=unchanged}}
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
+
{{PacketList|{{change|0x46|0x4E}}|Entity Velocity|pre=unchanged}}
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x47|0x4F}}|Entity Equipment|pre=unchanged}}
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
+
{{PacketList|0x4F|Title|rel=removed}}
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
+
{{PacketList|{{change|0x48|0x50}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x51}}|Update Health|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x52}}|Scoreboard Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x53}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x54}}|Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x55}}|Update Score|pre=unchanged}}
 +
{{PacketList|0x56|Set Title SubTitle|rel=added}}
 +
{{PacketList|0x57|Time Update|pre=unchanged}}
 +
{{PacketList|0x58|Set Title Text|rel=added}}
 +
{{PacketList|0x59|Set Title Time|rel=added}}
 +
{{PacketList|{{change|0x50|0x5A}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x5B}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x5C}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x5D}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x5E}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x5F}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x60}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x61}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x62}}|Entity Properties|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x63}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x64}}|Declare Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x65}}|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|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
+
!colspan="4"| Handshaking serverbound
{{PacketList|0x02|Login Success}}
+
{{PacketList|0x00|Handshake}}
 
  |}
 
  |}
  
Line 153: Line 137:
 
{{#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}}
 
 
 
{| class="wikitable"
 
! 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}}
+
=== Entity ===
  
Abstract base class for [[#Tipped Arrow|Tipped Arrow]] (which is used for regular arrows as well as tipped ones) and [[#Spectral Arrow|Spectral Arrow]].
+
{{metadata inherit|Entity}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 186: Line 149:
 
  ! 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|}}
 
| Byte
 
|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|}}
+
  | 0x04
| VarInt
+
  | Unused (previously riding)
  |colspan="2"| Loyalty level (enchantment)
 
| 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x08
| Boolean
+
  | Is sprinting
|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|}}
+
  | 0x10
| VarInt
+
  | Is swimming
|colspan="2"| Total time to "boost" with warped fungus on a stick for
 
  | 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x20
| Boolean
+
  | Is invisible
  |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|}}
+
  | 0x40
| Boolean
+
  | has glowing effect
|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|}}
+
  | 0x80
  | Boolean
+
  | Is flying with an {{Minecraft Wiki|elytra}}
|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|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | VarInt
  |colspan="2"| Is baby
+
  |colspan="2"| Air ticks
  | false
+
  | 300
|}
 
 
 
=== 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|}}
 
| Boolean
 
|colspan="2"| Is immune to zombification
 
| 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
+
  | OptChat
  |colspan="2"| Is baby
+
  |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
|}
 
 
=== 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|}}
 
  | {{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 408: Line 231:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Chat Message (clientbound) ====  
+
==== Sculk Vibration Signal ====
 +
 
 +
{| class="wikitable" {{Added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="4"| 0x05
 +
|rowspan="4"| Play
 +
|rowspan="4"| 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 [https://wiki.vg/Protocol#Data_types 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.
 +
 
 +
==== Clear Titles====
  
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}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|- {{ Added }}
 +
|rowspan="4"| 0x10
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
|- {{ Added }}
 +
| Reset
 +
| Boolean
 +
|
 +
|-
 +
  |}
  
{{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.}}
+
==== Initialize World Border ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 421: Line 291:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="3"| {{change|0x0F|0x0E}}
+
  |rowspan="8"| 0x20
  |rowspan="3"| Play
+
  |rowspan="8"| Play
  |rowspan="3"| Client
+
  |rowspan="8"| Client
  | JSON Data
+
  | X
  | [[Chat]]
+
  | Double
  | Limited to 32767 bytes
+
|
  |-
+
|- {{ Added }}
  | Position
+
| Z
  | Byte
+
| Double
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
+
  |  
  |- {{added}}
+
  |- {{ Added }}
  | Sender
+
  | Old Diameter
  | UUID
+
  | Double
  | Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
+
  | Current length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters.
 +
  |- {{ Added }}
 +
  | Speed
 +
  | VarLong
 +
  | Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 +
|- {{ Added }}
 +
| Portal Teleport Boundary
 +
| VarInt
 +
| Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
 +
|- {{ Added }}
 +
| Warning Blocks
 +
| VarInt
 +
| In meters.
 +
|- {{ Added }}
 +
| Warning Time
 +
| VarInt
 +
| In seconds as set by <code>/worldborder warning time</code>.
 +
|- {{ Added }}
 
  |}
 
  |}
 +
 +
The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:
 +
 +
<syntaxhighlight lang="java">
 +
distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
 +
if (playerDistance < distance) {
 +
    warning = 1.0 - playerDistance / distance;
 +
} else {
 +
    warning = 0.0;
 +
}
 +
</syntaxhighlight>
  
 
==== Chunk Data ====
 
==== Chunk Data ====
Line 444: Line 346:
 
{{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 356:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x22|0x20}}
+
  |rowspan="13"| {{change|0x20|0x22}}
  |rowspan="11"| Play
+
  |rowspan="13"| Play
  |rowspan="11"| Client
+
  |rowspan="13"| Client
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
Line 464: Line 366:
 
  | 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]]
  |-
+
  |- {{removed}}
 
  | 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.
  |- {{Added}}
+
  |-  
 
  | Biomes length
 
  | Biomes length
  | Optional VarInt
+
  | {{change|Optional|}} VarInt
  | Size of the following array.  Not present if full chunk is false.
+
  | Size of the following array; should always be 1024{{change|Not present if full chunk is false.|}}
 
  |-
 
  |-
 
  | Biomes
 
  | Biomes
  | Optional array of {{change|Integer|VarInt}}
+
  | {{change|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.
+
  | 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 504: Line 414:
 
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>
 
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>
Line 510: Line 420:
 
<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>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>
 
<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>
 +
 +
==== Entity Movement ====
 +
 +
This packet may be used to initialize an entity.
 +
 +
For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|- {{removed}}
 +
| 0x2A
 +
| Play
 +
| Client
 +
| Entity ID
 +
| VarInt
 +
|
 +
|}
  
 
==== Update Light ====
 
==== Update Light ====
Line 523: Line 455:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x25|0x23}}
+
  |rowspan="21"| {{change|0x23|0x25}}
  |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 564: Line 531:
 
  | 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 576: Line 547:
 
  |}
 
  |}
  
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 586: Line 556:
 
  ! 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|0x27}}
  |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
 +
|-
 +
|colspan="2"| Scale
 +
|colspan="2"| Byte
 +
| From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 +
|- {{removed}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Locked
 +
|colspan="2"| Boolean
 +
| True if the map has been locked in a cartography table
 +
|-
 +
|- {{added}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Icon Count
 +
|colspan="2"| VarInt
 +
| Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 +
|-
 +
|rowspan="6"| Icon
 +
| Type
 +
|rowspan="6"| 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
 
  |-
 
  |-
  | Is hardcore
+
  | Has Display Name
 
  | Boolean
 
  | Boolean
 
  |
 
  |
 
  |-
 
  |-
  | Gamemode
+
  | Display Name
| Unsigned Byte
+
  | Optional [[Chat]]
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. {{change|Bit 3 (0x8) is the hardcore flag.}}
+
  | Only present if previous Boolean is true
|- {{Added}}
+
  |-  
| Previous Gamemode
+
  |colspan="2"| Columns
| Unsigned Byte
+
  |colspan="2"| Unsigned Byte
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
+
  | Number of columns updated
|- {{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]]
 
  | The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
 
  |-
 
  | 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 before this}}
 
  |- {{Added}}
 
| World Name
 
| Identifier
 
| Name of the world being spawned into
 
 
  |-
 
  |-
  | Hashed seed
+
  |colspan="2"| Rows
  | 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; number of rows updated
 
  |-
 
  |-
  | Max Players
+
  |colspan="2"| X
  | {{change|Unsigned Byte|VarInt}}
+
  |colspan="2"| Optional Byte
  | Was once used by the client to draw the player list, but now is ignored
+
  | Only if Columns is more than 0; x offset of the westernmost column
|- {{Removed}}
 
| Level Type
 
| String Enum (16)
 
| default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
 
  |-
 
  |-
  | View Distance
+
  |colspan="2"| Z
  | VarInt
+
  |colspan="2"| Optional Byte
  | Render distance (2-32)
+
  | Only if Columns is more than 0; z offset of the northernmost row
 
  |-
 
  |-
  | Reduced Debug Info
+
  |colspan="2"| Length
  | Boolean
+
  |colspan="2"| Optional VarInt
  | If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
+
  | Only if Columns is more than 0; length of the following array
 
  |-
 
  |-
  | Enable respawn screen
+
  |colspan="2"| Data
| Boolean
+
  |colspan="2"| Optional Array of Unsigned Byte
  | Set to false when the doImmediateRespawn gamerule is true
+
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
|- {{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|Lay out and explain the format}}
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
 
 
'''[https://paste.gg/p/KennyTV/ad46ef552c6443cc808385f060564550 Default Vanilla Dimension/Biome Codec]'''
 
  
Known dimension attributes:
+
Types are based off of rows and columns in <code>map_icons.png</code>:
  
 
{| class="wikitable"
 
{| class="wikitable"
! Name
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Values
 
 
  |-
 
  |-
  | name
+
! Icon type
  | String
+
! Result
  |colspan="2"| Dimension's name
+
|-
  | "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
+
| 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
 
  |-
 
  |-
  | piglin_safe
+
  | 13
  | Byte
+
  | Light Blue Banner
|colspan="2"| Whether piglins shake and transform to zombified piglins.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | natural
+
  | 14
  | Byte
+
  | Yellow Banner
|colspan="2"| When false, compasses spin randomly. When true, nether portals can spawn zombified piglins.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | ambient_light
+
  | 15
  | Float
+
  | Lime Banner
|colspan="2"| How much light the dimension has.
 
| 0.0 to 1.0
 
 
  |-
 
  |-
  | fixed_time
+
  | 16
  | Long
+
  | Pink Banner
|colspan="2"| If this is set to a number, the time of the day is the specified value.
 
| false, or 0 to 24000
 
 
  |-
 
  |-
  | infiniburn
+
  | 17
  | String
+
  | Gray Banner
|colspan="2"| A resource location defining what block tag to use for infiniburn.
 
| "" or minecraft resource "minecraft:..."
 
 
  |-
 
  |-
  | respawn_anchor_works
+
  | 18
  | Byte
+
  | Light Gray Banner
|colspan="2"| Whether players can charge and use respawn anchors.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | has_skylight
+
  | 19
  | Byte
+
  | Cyan Banner
|colspan="2"| Whether the dimension has skylight access or not.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | bed_works
+
  | 20
  | Byte
+
  | Purple Banner
|colspan="2"| Whether players can use a bed to sleep.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | effects
+
  | 21
  | String
+
  | Blue Banner
|colspan="2"| ?
 
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 
 
  |-
 
  |-
  | has_raids
+
  | 22
  | Byte
+
  | Brown Banner
|colspan="2"| Whether players with the Bad Omen effect can cause a raid.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | logical_height
+
  | 23
  | Int
+
  | Green Banner
|colspan="2"| The maximum height to which chorus fruits and nether portals can bring players within this dimension.
 
| 0-256
 
 
  |-
 
  |-
  | coordinate_scale
+
  | 24
  | Float
+
  | Red Banner
|colspan="2"| The multiplier applied to coordinates when traveling to the dimension.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | ultrawarm
+
  | 25
  | Byte
+
  | Black Banner
|colspan="2"| Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner.
 
| 1: true, 0: false
 
 
  |-
 
  |-
  | has_ceiling
+
  | 26
  | Byte
+
  | Treasure marker
|colspan="2"| Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster.
 
| 1: true, 0: false
 
 
  |}
 
  |}
  
==== Unlock Recipes ====
+
==== Combat Event ====
 +
 
 +
Originally used for metadata for twitch streaming circa 1.8.  Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 756: Line 738:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{Removed}}
  |rowspan="14"| {{Change|0x37|0x35}}
+
  |rowspan="8"| 0x31
  |rowspan="14"| Play
+
  |rowspan="8"| Play
  |rowspan="14"| Client
+
  |rowspan="8"| Client
  |-
+
|colspan="2"| Event
  | Action
+
| VarInt Enum
 +
| Determines the layout of the remaining packet.
 +
  |- {{Removed}}
 +
! Event
 +
! Field Name
 +
!
 +
!
 +
|- {{Removed}}
 +
| 0: enter combat
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|- {{Removed}}
 +
|rowspan="2"| 1: end combat
 +
  | Duration
 
  | VarInt
 
  | VarInt
  | 0: init, 1: add, 2: remove
+
  | Length of the combat in ticks.
|-
+
  |- {{Removed}}
| Crafting Recipe Book Open
+
  | Entity ID
| Boolean
+
  | Int
| If true, then the crafting recipe book will be open when the player opens its inventory.
+
  | ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
|-
+
  |- {{Removed}}
| Crafting Recipe Book Filter Active
+
  |rowspan="3"| 2: entity dead
| Boolean
+
  | Player ID
| 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
 
  | VarInt
  | Number of elements in the following array
+
  | Entity ID of the player that died (should match the client's entity ID).
  |-
+
  |- {{Removed}}
  | Recipe IDs
+
  | Entity ID
| Array of Identifier
+
  | Int
  |
+
  | The killing entity's ID, or -1 if there is no obvious killer.
  |-
+
  |- {{Removed}}
| Array size 2
+
  | Message
| Optional VarInt
+
  | [[Chat]]
| Number of elements in the following array, only present if mode is 0 (init)
+
  | The death message.
  |-
 
  | Recipe IDs
 
  | Optional Array of Identifier, only present if mode is 0 (init)
 
  |
 
 
  |}
 
  |}
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 ====
+
==== End Combat Event ====
  
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.
+
Unused by the Notchain client.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 829: Line 790:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
|-
 
|rowspan="10"| {{Change|0x3B|0x39}}
 
|rowspan="10"| Play
 
|rowspan="10"| Client
 
| 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}}
 
  |- {{Added}}
  | World Name
+
  |rowspan="8"| 0x32
  | Identifier
+
  |rowspan="8"| Play
  | Name of the world being spawned into
+
  |rowspan="8"| Client
|-
+
  | Duration
  | Hashed seed
+
  | VarInt
  | Long
+
  | Length of the combat in ticks.
  | First 8 bytes of the SHA-256 hash of the world's seed.
 
 
  |- {{Added}}
 
  |- {{Added}}
  | Gamemode
+
  | Entity ID
  | Unsigned Byte
+
  | Int
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
+
  | ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
 
  |- {{Added}}
 
  |- {{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)
+
==== Enter Combat Event ====
|- {{Removed}}
+
 
| Level Type
+
Unused by the Notchain client.
  | String (16)
+
 
  | Same as [[#Join Game|Join Game]]
+
{| class="wikitable"
  |- {{Added}}
+
  ! Packet ID
  | Is Debug
+
  ! State
  | Boolean
+
  ! Bound To
  | True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
+
  !colspan="2"| Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |- {{Added}}
 
  |- {{Added}}
  | Is Flat
+
  |rowspan="8"| 0x33
| Boolean
+
  |rowspan="8"| Play
  | 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
+
  |rowspan="8"| Client
|- {{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).
+
==== Death Combat Event ====
  
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.}}
+
Used to send a respawn screen.
  
==== Multi Block Change ====
+
{| class="wikitable"
 
 
{| class="wikitable" {{added}}
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{Added}}
  |rowspan="4"| {{Change|0x10|0x3B}}
+
  |rowspan="8"| 0x34
  |rowspan="4"| Play
+
  |rowspan="8"| Play
  |rowspan="4"| Client
+
  |rowspan="8"| Client
  |
+
  | Player ID
| 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
 
| Always inverse the preceding Update Light packet's "Trust Edges" bool
 
|
 
|-
 
| Array size
 
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | Entity ID of the player that died (should match the client's entity ID).
  |-
+
  |- {{Added}}
  |  
+
  | Entity ID
  | Array of VarLong
+
  | Int
  | 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).
+
  | The killing entity's ID, or -1 if there is no obvious killer.
 +
|- {{Added}}
 +
| Message
 +
| [[Chat]]
 +
| The death message.
 
  |}
 
  |}
  
==== Entity Properties ====
+
==== 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 <code>3.2E7D</code> 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.
  
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
+
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 918: Line 869:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{change|0x59|0x58}}
+
  |rowspan="8"| {{change|0x34|0x38}}
  |rowspan="6"| Play
+
  |rowspan="8"| Play
  |rowspan="6"| Client
+
  |rowspan="8"| Client
  |colspan="2"| Entity ID
+
  | X
  |colspan="2"| VarInt
+
| 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.
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  | Yaw
  |colspan="2"| Int
+
  | Float
  | Number of elements in the following array
+
  | Absolute or relative rotation on the X axis, in degrees.
 
  |-
 
  |-
  |rowspan="4"| Property
+
  | Pitch
| Key
+
  | Float
|rowspan="4"| Array
+
  | Absolute or relative rotation on the Y axis, in degrees.
  | {{Change|String (64)|Identifier}}
 
  | See below
 
 
  |-
 
  |-
  | Value
+
  | Flags
  | Double
+
  | Byte
  | See below
+
  | Bit field, see below.
 
  |-
 
  |-
  | Number Of Modifiers
+
  | Teleport ID
 
  | 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}}
  | Modifiers
+
  | Dismount Vehicle
  | Array of Modifier Data
+
  | Boolean
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
+
  | True if the player should dismount their vehicle.
 
  |}
 
  |}
  
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
+
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.
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  |-
 
  |-
  ! Key
+
  ! Field
  ! Default
+
  ! Bit
! Min
 
! Max
 
! Label
 
 
  |-
 
  |-
  | {{change|generic.maxHealth|generic.max_health}}
+
  | X
| 20.0
+
  | 0x01
| 0.0
 
| 1024.0
 
  | Max Health
 
 
  |-
 
  |-
  | {{change|generic.followRange|generic.follow_range}}
+
  | Y
| 32.0
+
  | 0x02
| 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}}
+
  | Z
| 0.7
+
  | 0x04
| 0.0
 
| 2.0
 
  | Jump Strength
 
 
  |-
 
  |-
  | {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
+
  | Y_ROT
| 0.0
+
  | 0x08
| 0.0
 
| 1.0
 
  | Spawn Reinforcements Chance
 
 
  |-
 
  |-
  | generic.reachDistance
+
  | X_ROT
  | 5.0
+
  | 0x10
| 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.
+
==== Destroy Entity ====
  
''Modifier Data'' structure:
+
Sent by the server when {{change|a list of entities|an entity}} is to be destroyed on the client.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
 +
|rowspan="4"| 0x36
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
|- {{removed}}
 +
| Count
 +
| VarInt
 +
| Number of elements in the following array.
 +
|- {{Removed}}
 +
| Array of VarInt
 +
| The list of entities of destroy.
 +
|- {{Added}}
 +
| Entity ID
 +
| VarInt
 +
|}
 +
 +
==== Resource Pack Send ====
 +
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | UUID
+
  |rowspan="4"| {{change|0x38|0x3B}}
  | UUID
+
|rowspan="4"| Play
  |  
+
|rowspan="4"| Client
 +
| URL
 +
  | String (32767)
 +
  | The URL to the resource pack.
 
  |-
 
  |-
  | Amount
+
  | Hash
  | Double
+
  | String (40)
  | May be positive or negative
+
  | 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}}
  | Operation
+
| Forced
  | Byte
+
| Boolean
  | See below
+
| The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
 +
  |- {{Added}}
 +
  | Forced Message
 +
  | [[Chat]]
 +
  | This is sent with the force resourcepack popup.
 
  |}
 
  |}
 +
==== Title ====
  
The operation controls how the base value of the modifier is changed.
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
! Field Type
 +
! Notes
 +
|- {{ Removed }}
 +
|rowspan="10"| 0x4F
 +
|rowspan="10"| Play
 +
|rowspan="10"| Client
 +
|colspan="2"| Action
 +
| VarInt Enum
 +
|
 +
|- {{ Removed }}
 +
! Action
 +
! Field Name
 +
!
 +
!
 +
|- {{ Removed }}
 +
| 0: set title
 +
| Title Text
 +
| [[Chat]]
 +
|
 +
|- {{ Removed }}
 +
| 1: set subtitle
 +
| Subtitle Text
 +
| [[Chat]]
 +
|
 +
|- {{ Removed }}
 +
| 2: set action bar
 +
| Action bar text
 +
| [[Chat]]
 +
| Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]].
 +
|- {{ Removed }}
 +
|rowspan="3"| 3: set times and display
 +
| Fade In
 +
| Int
 +
| Ticks to spend fading in.
 +
|- {{ Removed }}
 +
| Stay
 +
| Int
 +
| Ticks to keep the title displayed.
 +
|- {{ Removed }}
 +
| Fade Out
 +
| Int
 +
| Ticks to spend out, not when to start fading out.
 +
|- {{ Removed }}
 +
| 4: hide
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|- {{ Removed }}
 +
| 5: reset
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|}
  
* 0: Add/subtract amount
+
“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.
* 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.
+
The title is visible on screen for Fade In + Stay + Fade Out ticks.
  
==== Declare Recipes ====
+
==== Action Bar ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,090: Line 1,061:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="4"| {{change|0x5B|0x5A}}
+
  |rowspan="4"| 0x40
 
  |rowspan="4"| Play
 
  |rowspan="4"| Play
 
  |rowspan="4"| Client
 
  |rowspan="4"| Client
  |colspan="2"| Num Recipes
+
  | Action bar text
  |colspan="2"| VarInt
+
  | [[Chat]]
  | Number of elements in the following array
+
  | Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]].
|-
+
  |- {{ Added }}
|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.
 
 
  |}
 
  |}
 +
==== World Border Center ====
  
Recipe types:
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|- {{ Added }}
 +
|rowspan="18"| 0x41
 +
|rowspan="18"| Play
 +
|rowspan="18"| Client
 +
| X
 +
| Double
 +
|
 +
|- {{ Added }}
 +
| Z
 +
| Double
 +
|
 +
|- {{ Added }}
 +
|}
 +
==== World Border Lerp Size ====
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Type
+
  ! Packet ID
  ! Description
+
! State
  ! Data
+
! Bound To
 +
! Field Name
 +
! Field Type
 +
  ! Notes
 +
|- {{ Added }}
 +
|rowspan="4"| 0x42
 +
|rowspan="4"| Play
 +
  |rowspan="4"| Client
 +
| Old Diameter
 +
| Double
 +
| Current length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| Speed
 +
| VarLong
 +
| Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 
  |-
 
  |-
  | <code>crafting_shapeless</code>
+
  |}
| Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
+
==== World Border Size ====
| As follows:
+
 
  {| class="wikitable"
+
{| class="wikitable"
    ! Name
+
! Packet ID
    ! Type
+
! State
    ! Description
+
! Bound To
    |-
+
  ! Field Name
    | Group
+
! Field Type
    | String
+
! Notes
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
+
  |- {{ Added }}
    |-
+
  |rowspan="4"| 0x43
    | Ingredient count
+
  |rowspan="4"| Play
    | VarInt
+
|rowspan="4"| Client
    | Number of elements in the following array
+
  | Diameter
    |-
+
  | Double
    | Ingredients
+
  | Length of a single side of the world border, in meters.
    | Array of Ingredient
+
  |- {{ Added }}
    |
 
    |-
 
    | 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>
 
| 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:
+
==== World Border Warning Delay====
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Name
+
  ! Packet ID
  ! Type
+
! State
  ! Description
+
! Bound To
  |-
+
! Field Name
  | Count
+
  ! Field Type
 +
  ! Notes
 +
  |- {{ Added }}
 +
|rowspan="4"| 0x44
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
  | Warning Time
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | In seconds as set by <code>/worldborder warning time</code>.
  |-
+
  |- {{ Added }}
| Items
 
| Array of [[Slot]]
 
| Any item in this array may be used for the recipe.  The count of each item should be 1.
 
 
  |}
 
  |}
  
=== Serverbound ===
+
==== World Border Warning Reach====  
 
 
==== 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"
 
{| class="wikitable"
Line 1,331: Line 1,168:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="7"| 0x0E
+
  |rowspan="4"| 0x45
  |rowspan="7"| Play
+
  |rowspan="4"| Play
  |rowspan="7"| Server
+
  |rowspan="4"| Client
  | Entity ID
+
  | Warning Blocks
 
  | VarInt
 
  | VarInt
  | The ID of the entity to interact
+
  | In meters.
|-
+
  |- {{ Added }}
| Type
 
| VarInt Enum
 
| 0: interact, 1: attack, 2: interact at
 
|-
 
| Target X
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Target Y
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Target Z
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Hand
 
| Optional VarInt Enum
 
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
  |- {{Added}}
 
| Sneaking
 
| Boolean
 
| If the client is sneaking.
 
 
  |}
 
  |}
  
==== Generate Structure ====
+
==== Set Title SubTitle ====  
  
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
+
{| class="wikitable"
 
 
{| class="wikitable" {{added}}
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,375: Line 1,187:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="3"| 0x0F
+
  |rowspan="4"| 0x56
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Server
+
  |rowspan="4"| Client
  | Location
+
  | Subtitle Text
  | Position
+
  | [[Chat]]
| Block entity location
+
  |- {{ Added }}
  |-
 
| Levels
 
| VarInt
 
| Value of the levels slider/max depth to generate
 
|-
 
| Keep Jigsaws
 
| Boolean
 
|
 
 
  |}
 
  |}
  
==== 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.}}
+
==== Set Title Text ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,405: Line 1,206:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="3"| {{change|0x19|0x1A}}
+
  |rowspan="4"| 0x58
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Server
+
  |rowspan="4"| Client
  | Flags
+
  | Title Text
  | Byte
+
  | [[Chat]]
| Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
+
  |- {{ Added }}
  |- {{removed}}
 
| Flying Speed
 
| Float
 
|
 
|- {{removed}}
 
| Walking Speed
 
| Float
 
|
 
 
  |}
 
  |}
  
==== Set Displayed Recipe ====
+
==== Set Title Time====  
  
Replaces Recipe Book Data, type 0.
+
{| class="wikitable"
 
 
{| class="wikitable" {{Added}}
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,433: Line 1,224:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="1"| 0x1E
+
  |rowspan="4"| 0x59
  |rowspan="1"| Play
+
  |rowspan="4"| Play
  |rowspan="1"| Server
+
  |rowspan="4"| Client
  | Recipe ID
+
  | Fade In
  | Identifier
+
  | Int
  |
+
  | Ticks to spend fading in.
 +
|- {{ Added }}
 +
| Stay
 +
| Int
 +
| Ticks to keep the title displayed.
 +
|- {{ Added }}
 +
| Fade Out
 +
| Int
 +
| Ticks to spend out, not when to start fading out.
 
  |}
 
  |}
  
==== Set Recipe Book State ====
 
  
Replaces Recipe Book Data, type 1.
+
==== Tags ====
  
{| class="wikitable" {{Added}}
+
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1F
+
  |rowspan="8"| {{change|0x5B|0x65}}
  |rowspan="3"| Play
+
  |rowspan="8"| Play
  |rowspan="3"| Server
+
  |rowspan="8"| Client
  | Book ID
+
|- {{removed}}
  | VarInt enum
+
| colspan="2"| Block Tags
  | 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
+
| colspan="2"| (See below)
 +
| IDs are block IDs
 +
|- {{removed}}
 +
| colspan="2"| Item Tags
 +
| colspan="2"| (See below)
 +
| IDs are item IDs
 +
|- {{removed}}
 +
| colspan="2"| Fluid Tags
 +
| colspan="2"| (See below)
 +
| IDs are fluid IDs
 +
|- {{removed}}
 +
| colspan="2"| Entity Tags
 +
| 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>)
 
  |-
 
  |-
  | Book Open
+
  | Array of Tag
  | Boolean
+
  | (See below)
 
  |
 
  |
 +
|}
 +
 +
Tags look like:
 +
 +
{| class="wikitable"
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 +
|-
 +
|colspan="2"| Length
 +
|colspan="2"| VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | Filter Active
+
  |rowspan="3"| Tags
  | Boolean
+
| Tag name
 +
|rowspan="3"| Array
 +
  | Identifier
 
  |
 
  |
 +
|-
 +
| Count
 +
| VarInt
 +
| Number of elements in the following array
 +
|-
 +
| Entries
 +
| Array of VarInt
 +
| Numeric ID of the given type (block, item, etc.).
 
  |}
 
  |}
  
==== Update Jigsaw Block ====
 
  
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
+
=== Serverbound ===
 +
 
 +
==== Client Settings ====
 +
 
 +
Sent when the player connects, or when settings are changed.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,482: Line 1,328:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| {{Change|0x27|0x28}}
+
  |rowspan="7"| 0x05
 
  |rowspan="7"| Play
 
  |rowspan="7"| Play
 
  |rowspan="7"| Server
 
  |rowspan="7"| Server
  | Location
+
  | Locale
  | Position
+
  | String (16)
  | Block entity location
+
  | e.g. <code>en_GB</code>.
  |- {{Removed}}
+
  |-
  | Attachment type
+
  | View Distance
  | Identifier
+
  | Byte
  |  
+
  | Client-side render distance, in chunks.
  |- {{Added}}
+
  |-
  | Name
+
  | Chat Mode
  | Identifier
+
  | VarInt Enum
  |  
+
  | 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
  |- {{Added}}
+
  |-
  | Target
+
  | Chat Colors
  | Identifier
+
  | Boolean
  |  
+
  | “Colors” multiplayer setting.
  |-  
+
  |-
  | {{Change|Target pool|Pool}}
+
  | Displayed Skin Parts
  | Identifier
+
  | Unsigned Byte
  |  
+
  | Bit mask, see below.
 
  |-
 
  |-
  | Final state
+
  | Main Hand
  | String
+
  | VarInt Enum
  | "Turns into" on the GUI, <code>final_state</code> in NBT
+
  | 0: Left, 1: Right.
 
  |- {{Added}}
 
  |- {{Added}}
  | Joint type
+
  | Disable text filtering
  | String
+
  | Boolean
  | <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
+
  | Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 
  |}
 
  |}
  
==== Entity Equipment ====
+
''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.
 +
 
 +
 
 +
==== Window Confirmation (serverbound) ====
 +
 
 +
If a confirmation sent by the client was not accepted, the server will reply with a [[#Window Confirmation (clientbound)|Window Confirmation (clientbound)]] packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,520: Line 1,381:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Removed }}
  |rowspan="5"| 0x47
+
  |rowspan="3"| 0x07
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Client
+
  |rowspan="3"| Server
  |colspan="2"| Entity ID
+
  | Window ID
  |colspan="2"| VarInt
+
  | Byte
  | Entity's EID
+
  | The ID of the window that the action occurred in.
  |- {{Removed}}
+
  |- {{ Removed }}
  |colspan="2"| Slot
+
  | Action Number
  |colspan="2"| VarInt Enum
+
  | Short
  | Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
+
  | Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
  |- {{Removed}}
+
  |- {{ Removed }}
  |colspan="2"| Item
+
  | Accepted
|colspan="2"| [[Slot Data|Slot]]
+
  | Boolean
  |  
+
  | Whether the action was accepted.
  |-
 
|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 1,575: Line 1,425:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|578|1073741826}})
+
  | See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
Line 1,604: Line 1,454:
 
=== 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 02:28, 6 May 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)
0x10 Clear Titles Pre
0x0F 0x11 Tab-Complete (clientbound) Current (unchanged)
0x10 0x12 Declare Commands Current (unchanged)
0x11 Window Confirmation (clientbound) Current
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)
0x20 Initialize World Border Pre
0x1F 0x21 Keep Alive (clientbound) Current (unchanged)
0x20 0x22 Chunk Data Current Pre
0x21 0x23 Effect Current (unchanged)
0x22 0x24 Particle Current (unchanged)
0x23 0x25 Update Light Current Pre
0x24 0x26 Join Game Current (unchanged)
0x25 0x27 Map Data Current Pre
0x26 0x28 Trade List Current (unchanged)
0x27 0x29 Entity Position Current (unchanged)
0x28 0x2A Entity Position and Rotation Current (unchanged)
0x29 0x2B Entity Rotation Current (unchanged)
0x2A Entity Movement Current
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 Combat Event Current
0x32 End Combat Event Pre
0x33 Enter Combat Event Pre
0x34 Death Combat Event Pre
0x32 0x35 Player Info Current (unchanged)
0x33 0x36 Face Player Current (unchanged)
0x36 Destroy Entities Current Pre|rel=removed}}
0x34 0x37 Player Position And Look (clientbound) Current Pre
0x35 0x38 Unlock Recipes Current (unchanged)
0x39 Destroy Entity Current Pre|rel=added}}
0x37 0x3A Remove Entity Effect Current (unchanged)
0x38 0x3B Resource Pack Send Current Pre
0x39 0x3C Respawn Current (unchanged)
0x3A 0x3D Entity Head Look Current (unchanged)
0x3B 0x3E Multi Block Change Current (unchanged)
0x3C 0x3F Select Advancement Tab Current (unchanged)
0x40 Action Bar Pre
0x41 World Border Center Pre
0x42 World Border Lerp Size Pre
0x43 World Border Size Pre
0x44 World Border Warning Delay Pre
0x45 World Border Warning Reach Pre
0x3E 0x46 Camera Current (unchanged)
0x3F 0x47 Held Item Change (clientbound) Current (unchanged)
0x40 0x48 Update View Position Current (unchanged)
0x41 0x49 Update View Distance Current (unchanged)
0x42 0x4A Spawn Position Current (unchanged)
0x43 0x4B Display Scoreboard Current (unchanged)
0x44 0x4C Entity Metadata Current (unchanged)
0x45 0x4D Attach Entity Current (unchanged)
0x46 0x4E Entity Velocity Current (unchanged)
0x47 0x4F Entity Equipment Current (unchanged)
0x4F Title Current Pre
0x48 0x50 Set Experience Current (unchanged)
0x49 0x51 Update Health Current (unchanged)
0x4A 0x52 Scoreboard Objective Current (unchanged)
0x4B 0x53 Set Passengers Current (unchanged)
0x4C 0x54 Teams Current (unchanged)
0x4D 0x55 Update Score Current (unchanged)
0x56 Set Title SubTitle Pre
0x57 Time Update Current (unchanged)
0x58 Set Title Text Pre
0x59 Set Title Time Pre
0x50 0x5A Entity Sound Effect Current (unchanged)
0x51 0x5B Sound Effect Current (unchanged)
0x52 0x5C Stop Sound Current (unchanged)
0x53 0x5D Player List Header And Footer Current (unchanged)
0x54 0x5E NBT Query Response Current (unchanged)
0x55 0x5F Collect Item Current (unchanged)
0x56 0x60 Entity Teleport Current (unchanged)
0x57 0x61 Advancements Current (unchanged)
0x58 0x62 Entity Properties Current (unchanged)
0x59 0x63 Entity Effect Current (unchanged)
0x5A 0x64 Declare Recipes Current (unchanged)
0x5B 0x65 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.

Clear Titles

Packet ID State Bound To Field Name Field Type Notes
0x10 Play Client
Reset Boolean

Initialize World Border

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Client X Double
Z Double
Old Diameter Double Current length of a single side of the world border, in meters.
New Diameter Double Target length of a single side of the world border, in meters.
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
Portal Teleport Boundary VarInt Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
Warning Blocks VarInt In meters.
Warning Time VarInt In seconds as set by /worldborder warning time.

The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:

distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
if (playerDistance < distance) {
    warning = 1.0 - playerDistance / distance;
} else {
    warning = 0.0;
}

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 0x22 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
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

Entity Movement

This packet may be used to initialize an entity.

For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.

Packet ID State Bound To Field Name Field Type Notes
0x2A Play Client Entity ID VarInt

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x25 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 0x27 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

Combat Event

Originally used for metadata for twitch streaming circa 1.8. Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)

Packet ID State Bound To Field Name Field Type Notes
0x31 Play Client Event VarInt Enum Determines the layout of the remaining packet.
Event Field Name
0: enter combat no fields no fields
1: end combat Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
2: entity dead Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message.

End Combat Event

Unused by the Notchain client.

Packet ID State Bound To Field Name Field Type Notes
0x32 Play Client Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.

Enter Combat Event

Unused by the Notchain client.

Packet ID State Bound To Field Name Field Type Notes
0x33 Play Client


Death Combat Event

Used to send a respawn screen.

Packet ID State Bound To Field Name Field Type Notes
0x34 Play Client Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message.

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 0x38 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

Destroy Entity

Sent by the server when a list of entities an entity is to be destroyed on the client.

Packet ID State Bound To Field Name Field Type Notes
0x36 Play Client
Count VarInt Number of elements in the following array.
Array of VarInt The list of entities of destroy.
Entity ID VarInt

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 0x3B 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.
Forced Message Chat This is sent with the force resourcepack popup.

Title

Packet ID State Bound To Field Name Field Type Notes
0x4F Play Client Action VarInt Enum
Action Field Name
0: set title Title Text Chat
1: set subtitle Subtitle Text Chat
2: set action bar Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound).
3: set times and display Fade In Int Ticks to spend fading in.
Stay Int Ticks to keep the title displayed.
Fade Out Int Ticks to spend out, not when to start fading out.
4: hide no fields no fields
5: reset no fields no fields

“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.

The title is visible on screen for Fade In + Stay + Fade Out ticks.

Action Bar

Packet ID State Bound To Field Name Field Type Notes
0x40 Play Client Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound).

World Border Center

Packet ID State Bound To Field Name Field Type Notes
0x41 Play Client X Double
Z Double

World Border Lerp Size

Packet ID State Bound To Field Name Field Type Notes
0x42 Play Client Old Diameter Double Current length of a single side of the world border, in meters.
New Diameter Double Target length of a single side of the world border, in meters.
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.

World Border Size

Packet ID State Bound To Field Name Field Type Notes
0x43 Play Client Diameter Double Length of a single side of the world border, in meters.

World Border Warning Delay

Packet ID State Bound To Field Name Field Type Notes
0x44 Play Client Warning Time VarInt In seconds as set by /worldborder warning time.

World Border Warning Reach

Packet ID State Bound To Field Name Field Type Notes
0x45 Play Client Warning Blocks VarInt In meters.

Set Title SubTitle

Packet ID State Bound To Field Name Field Type Notes
0x56 Play Client Subtitle Text Chat


Set Title Text

Packet ID State Bound To Field Name Field Type Notes
0x58 Play Client Title Text Chat

Set Title Time

Packet ID State Bound To Field Name Field Type Notes
0x59 Play Client Fade In Int Ticks to spend fading in.
Stay Int Ticks to keep the title displayed.
Fade Out Int Ticks to spend out, not when to start fading out.


Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x65 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.


Window Confirmation (serverbound)

If a confirmation sent by the client was not accepted, the server will reply with a Window Confirmation (clientbound) packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.

Packet ID State Bound To Field Name Field Type Notes
0x07 Play Server Window ID Byte The ID of the window that the action occurred in.
Action Number Short Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
Accepted Boolean Whether the action was accepted.

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.