Difference between revisions of "Pre-release protocol"

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m (Update cat types)
(→‎Entity Metadata: Merge changes from stable docs to incorporate new metadata type templates. Fix my earlier mistake on Pose in the process.)
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.13.2, protocol 404]]) to the current pre-release (currently [[Protocol version numbers|18w44a, protocol 443]]). 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|1.20.4, protocol 765]]) to the current pre-release (currently [[Protocol version numbers|24w03b, protocol {{Snapshot PVN|1073741996}}]]). 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 ===
  
==== Position ====
+
No changes so far.
 
 
64-bit value split in to three parts
 
 
 
* x: 26 MSBs
 
* z: 26 {{change|LSBs|middle bits}}
 
* y: 12 {{change|bits between them|LSBs}}
 
 
 
Encoded as followed:
 
 
 
((x & 0x3FFFFFF) << 38) | {{change|((y & 0xFFF) << 26) {{!}} (z & 0x3FFFFFF)|((z & 0x3FFFFFF) << 12) {{!}} (y & 0xFFF)}}
 
 
 
And decoded as:
 
 
 
val = read_unsigned_long();
 
x = val >> 38;
 
y = {{change|(val >> 26) & 0xFFF|val & 0xFFF}};
 
z = {{change|val << 38 >> 38|(val << 38 >> 38) >> 12}};
 
 
 
Note: The details of bit shifting are rather language dependent; the above may work in Java but probably won't in other languages without some tweaking. In particular, you will usually receive positive numbers even if the actual coordinates are negative. This can be fixed by adding something like the following:
 
 
 
if x >= 2^25 { x -= 2^26 }
 
if y >= 2^11 { y -= 2^12 }
 
if z >= 2^25 { z -= 2^26 }
 
  
 
=== Packets ===
 
=== Packets ===
Line 41: Line 18:
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 
  |-
 
  |-
!colspan="4"| Handshaking serverbound
+
!colspan="4"| Handshake serverbound
{{PacketList|0x00|Handshake}}
+
{{PacketList|0x00|Handshake}}
 +
|-
 +
!colspan="4"| Login clientbound
 +
{{PacketList|0x05|Cookie Request (login)|rel=added}}
 +
|-
 +
!colspan="4"| Login serverbound
 +
{{PacketList|0x04|Cookie Response (login)|rel=added}}
 +
|-
 +
!colspan="4"| Configuration clientbound
 +
{{PacketList|0x00|Cookie Request (configuration)|rel=added}}
 +
{{PacketList|{{change|0x00|0x01}}|Clientbound Plugin Message (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x01|0x02}}|Disconnect (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x03|0x04}}|Clientbound Keep Alive (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x04|0x05}}|Ping (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x05|0x06}}|Registry Data|pre=unchanged}}
 +
{{PacketList|{{change|0x06|0x07}}|Remove Resource Pack (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x08}}|Add Resource Pack (configuration)|pre=unchanged}}
 +
{{PacketList|0x09|Store Cookie (configuration)|rel=added}}
 +
{{PacketList|0x0A|Transfer (configuration)|rel=added}}
 +
{{PacketList|{{change|0x08|0x0B}}|Feature Flags|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0C}}|Update Tags (configuration)|pre=unchanged}}
 +
 
 +
|-
 +
!colspan="4"| Configuration serverbound
 +
{{PacketList|0x01|Cookie Response (configuration)|rel=added}}
 +
{{PacketList|{{change|0x01|0x02}}|Serverbound Plugin Message (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x03|0x04}}|Serverbound Keep Alive (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x04|0x05}}|Pong (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x05|0x06}}|Resource Pack Response (configuration)|pre=unchanged}}
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x16|Cookie Request (Play)|rel=added}}
 +
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Chat Suggestions|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Clientbound Plugin Message (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Damage Event|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Delete Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Disguised Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Entity Event|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Game Event|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x22}}|Open Horse Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Hurt Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Initialize World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x25}}|Clientbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Chunk Data and Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x27}}|World Event|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Login (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Map Data|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Merchant Offers|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Update Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Update Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Update Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Open Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Ping (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Ping Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Place Ghost Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x38}}|Player Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x39}}|End Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x39|0x3A}}|Enter Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3B}}|Combat Death|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3C}}|Player Info Remove|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3D}}|Player Info Update|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3E}}|Look At|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3F}}|Synchronize Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x40}}|Update Recipe Book|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x41}}|Remove Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x42}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x43}}|Reset Score|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x44}}|Remove Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x45}}|Add Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x46}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x47}}|Set Head Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x48}}|Update Section Blocks|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x49}}|Select Advancements Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4A}}|Server Data|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4B}}|Set Action Bar Text|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4C}}|Set Border Center|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4D}}|Set Border Lerp Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4E}}|Set Border Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x4F}}|Set Border Warning Delay|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x50}}|Set Border Warning Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x51}}|Set Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x52}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x53}}|Set Center Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x54}}|Set Render Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x55}}|Set Default Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x56}}|Display Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x57}}|Set Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x58}}|Link Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x59}}|Set Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5A}}|Set Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5B}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5C}}|Set Health|pre=unchanged}}
 +
{{PacketList|{{change|0x5C|0x5D}}|Update Objectives|pre=unchanged}}
 +
{{PacketList|{{change|0x5D|0x5E}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x5E|0x5F}}|Update Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x5F|0x60}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x60|0x61}}|Set Simulation Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x61|0x62}}|Set Subtitle Text|pre=unchanged}}
 +
{{PacketList|{{change|0x62|0x63}}|Update Time|pre=unchanged}}
 +
{{PacketList|{{change|0x63|0x64}}|Set Title Text|pre=unchanged}}
 +
{{PacketList|{{change|0x64|0x65}}|Set Title Animation Times|pre=unchanged}}
 +
{{PacketList|{{change|0x65|0x66}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x66|0x67}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x67|0x68}}|Start Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x68|0x69}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|0x6A|Store Cookie (Play)|rel=added}}
 +
{{PacketList|{{change|0x69|0x6B}}|System Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x6A|0x6C}}|Set Tab List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x6B|0x6D}}|Tag Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x6C|0x6E}}|Pickup Item|pre=unchanged}}
 +
{{PacketList|{{change|0x6D|0x6F}}|Teleport Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x6E|0x70}}|Set Ticking State|pre=unchanged}}
 +
{{PacketList|{{change|0x6F|0x71}}|Step Tick|pre=unchanged}}
 +
{{PacketList|0x72|Transfer (Play)|rel=added}}
 +
{{PacketList|{{change|0x70|0x73}}|Update Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x71|0x74}}|Update Attributes}}
 +
{{PacketList|{{change|0x72|0x75}}|Entity Effect}}
 +
{{PacketList|{{change|0x73|0x76}}|Update Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x74|0x77}}|Update Tags (play)|pre=unchanged}}
 
  |-
 
  |-
!colspan="4"| Play clientbound
+
!colspan="4"| Play serverbound
{{PacketList|0x22|Chunk Data}}
+
{{PacketList|0x10|Cookie Response (play)|rel=added}}
{{PacketList|0x4E|Entity Sound Effect|rel=added}}
+
{{PacketList|{{change|0x10|0x11}}|Serverbound Plugin Message (play)|pre=unchanged}}
{{PacketList|{{change|0x4E|0x4F}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x12}}|Edit Book|pre=unchanged}}
{{PacketList|{{change|0x4F|0x50}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Query Entity Tag|pre=unchanged}}
{{PacketList|{{change|0x50|0x51}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Interact|pre=unchanged}}
{{PacketList|{{change|0x51|0x52}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Jigsaw Generate|pre=unchanged}}
{{PacketList|{{change|0x52|0x53}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Serverbound Keep Alive (play)|pre=unchanged}}
{{PacketList|{{change|0x53|0x54}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Lock Difficulty|pre=unchanged}}
{{PacketList|{{change|0x54|0x55}}|Declare Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Set Player Position|pre=unchanged}}
{{PacketList|{{change|0x55|0x56}}|Tags}}
+
{{PacketList|{{change|0x18|0x19}}|Set Player Position and Rotation|pre=unchanged}}
{{PacketList|0x57|Update Light|rel=added}}
+
{{PacketList|{{change|0x19|0x1A}}|Set Player Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Set Player On Ground|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Paddle Boat|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Pick Item|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Ping Request (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Place Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x22}}|Player Action|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Player Command|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Player Input|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x25}}|Pong (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Change Recipe Book Settings|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x27}}|Set Seen Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Rename Item|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Resource Pack Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Seen Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Select Trade|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Set Beacon Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Program Command Block|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Program Command Block Minecart|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Set Creative Mode Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Program Jigsaw Block|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Program Structure Block|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Update Sign|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Swing Arm|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Teleport To Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Use Item On|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Use Item|pre=unchanged}}
 
  |}
 
  |}
  
Line 64: Line 200:
 
== Entity Metadata ==
 
== Entity Metadata ==
  
=== Mobs ===
+
{{#vardefine: meta_prerelease | 1}}
  
Entity IDs have shifted with the addition of some new mobs.
+
{{Metadata type definition/begin}}
 +
! Value
 +
! Notes
 +
{{Metadata type definition|Byte}}
 +
| {{Type|Byte}}
 +
|
 +
{{Metadata type definition|VarInt}}
 +
| {{Type|VarInt}}
 +
|
 +
{{Metadata type definition|VarLong}}
 +
| {{Type|VarLong}}
 +
|
 +
{{Metadata type definition|Float}}
 +
| {{Type|Float}}
 +
|
 +
{{Metadata type definition|String}}
 +
| {{Type|String}}
 +
|
 +
{{Metadata type definition|Text Component}}
 +
| {{Type|Text Component}}
 +
|
 +
{{Metadata type definition|Optional Text Component}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Text Component}})
 +
| Text Component is present if the Boolean is set to true.
 +
{{Metadata type definition|Slot}}
 +
| {{Type|Slot}}
 +
|
 +
{{Metadata type definition|Boolean}}
 +
| {{Type|Boolean}}
 +
|
 +
{{Metadata type definition|Rotations}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| rotation on x, rotation on y, rotation on z
 +
{{Metadata type definition|Position}}
 +
| {{Type|Position}}
 +
|
 +
{{Metadata type definition|Optional Position}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Position}})
 +
| Position is present if the Boolean is set to true.
 +
{{Metadata type definition|Direction}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
 +
{{Metadata type definition|Optional UUID}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|UUID}})
 +
| UUID is present if the Boolean is set to true.
 +
{{Metadata type definition|Block State}}
 +
| {{Type|VarInt}}
 +
| An ID in the block state registry.
 +
{{Metadata type definition|Optional Block State}}
 +
| {{Type|VarInt}}
 +
| 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
 +
{{Metadata type definition|NBT}}
 +
| {{Type|NBT}}
 +
|
 +
{{Metadata type definition|Particle}}
 +
| ({{Type|VarInt}}, Varies)
 +
| particle type (an ID in the <code>minecraft:particle_type</code> registry), particle data (See [[Particles]].)
 +
{{Metadata type definition|Villager Data}}
 +
| ({{Type|VarInt}}, {{Type|VarInt}}, {{Type|VarInt}})
 +
| villager type, villager profession, level (See below.)
 +
{{Metadata type definition|Optional VarInt}}
 +
| {{Type|VarInt}}
 +
| 0 for absent; 1 + actual value otherwise. Used for entity IDs.
 +
{{Metadata type definition|Pose}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14{{change||2=, SLIDING = 15, SHOOTING = 16, INHALING = 17}}
 +
{{Metadata type definition|Cat Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:cat_variant</code> registry.
 +
{{Metadata type definition|Frog Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:frog_variant</code> registry.
 +
{{Metadata type definition|Optional Global Position}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Identifier}}, {{Type|Optional}} {{Type|Position}})
 +
| dimension identifier, position; only if the Boolean is set to true.
 +
{{Metadata type definition|Painting Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:painting_variant</code> registry.
 +
{{Metadata type definition|Sniffer State}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
 +
{{Metadata type definition|Armadillo State|rel=added}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| IDLE = 0, ROLLING = 1, SCARED = 2
 +
{{Metadata type definition|Vector3}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| x, y, z
 +
{{Metadata type definition|Quaternion}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| x, y, z, w
 +
|}
  
=== Arrow ===
+
=== Armadillo ===
  
Extends [[#Entity|Entity]].
+
{{Metadata inherit|Armadillo|inherits=Animal|start_at=17}}
 
+
{| class="wikitable" {{added}}
Abstract base class for [[#TippedArrow|TippedArrow]] (which is used for regular arrows as well as tipped ones) and Spectral Arrow.
 
 
 
{| class="wikitable"
 
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
Line 80: Line 303:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | rowspan="2" | 6
+
  | {{Metadata id|added}}
| rowspan="2" | Byte
+
  | {{Metadata type|Armadillo State}}
! Bit mask
+
  |colspan="2"| Armadillo State
! Meaning
+
  | IDLE
| rowspan="2" | 0
 
|-
 
| 0x01
 
| Is critical
 
|-
 
| 7
 
| OptUUID
 
|colspan="2"| Shooter UUID
 
| Empty
 
|- {{added}}
 
  | 8
 
| Byte
 
  |colspan="2"| Unknown
 
  | 0
 
 
  |}
 
  |}
  
=== TippedArrow ===
+
== Block Actions ==
  
Extends [[#Arrow|Arrow]].
+
No changes so far.
  
Used for both tipped and regular arrows. If not tipped, then color is set to -1 and no tipped arrow particles are used.
+
== Inventories ==
 +
 
 +
No changes so far.
 +
 
 +
== Plugin Channels ==
 +
 
 +
No changes so far.
 +
 
 +
== Handshake ==
 +
 
 +
=== Serverbound ===
 +
 
 +
==== Handshake ====
 +
 
 +
This causes the server to switch into the target state.
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Index
+
  ! Packet ID
  ! Type
+
  ! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  ! Default
+
! Field Name
 +
! Field Type
 +
  ! Notes
 +
|-
 +
| rowspan="4"| 0x00
 +
| rowspan="4"| Handshaking
 +
| rowspan="4"| Server
 +
| Protocol Version
 +
  | [[#Definitions:varint|VarInt]]
 +
| See [[protocol version numbers]] (currently 765 in Minecraft 1.20.4).
 +
|-
 +
| Server Address
 +
| [[#Definitions:string|String]] (255)
 +
| 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 simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide example.org as server address in addition to connecting to it.
 +
|-
 +
| Server Port
 +
| [[#Definitions:unsigned-short|Unsigned Short]]
 +
| Default is 25565. The Notchian server does not use this information.
 
  |-
 
  |-
  | {{change|8|9}}
+
  | Next State
  | VarInt
+
  | [[#Definitions:varint|VarInt]] [[#Definitions:enum|Enum]]
  |colspan="2"| Color (-1 for no particles)
+
  | 1 for [[#Status|Status]], 2 for [[#Login|Login]]{{change||, 3 for [[#Login|Transfer]]}}.
| -1
 
 
  |}
 
  |}
  
=== Trident ===
+
== Status ==
  
Extends [[#Arrow|Arrow]].
+
=== Clientbound ===
  
{| class="wikitable"
+
No changes so far.
  ! Index
+
 
  ! Type
+
=== Serverbound ===
  !style="width: 250px;" colspan="2"| Meaning
+
 
  ! Default
+
No changes so far.
 +
 
 +
== Login ==
 +
 
 +
=== Clientbound ===
 +
 
 +
==== Cookie Request (login) ====
 +
 
 +
Requests a cookie that was previously stored.
 +
 
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
  ! Notes
 
  |-
 
  |-
  | {{change|8|9}}
+
  | rowspan="1"| 0x05
  | VarInt
+
| rowspan="1"| Login
  |colspan="2"| Loyalty level (enchantment)
+
| rowspan="1"| Client
  | 0
+
  | colspan="2"| Key
 +
  | colspan="2"| Identifier
 +
  | The identifier of the cookie.
 
  |}
 
  |}
  
=== Fireworks ===
+
=== Serverbound ===
 +
 
 +
==== Cookie Response (login) ====
  
Extends [[#Entity|Entity]].
+
Response to a [[#Cookie_Request_(login)|Cookie Request (login)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
  ! Index
+
  ! Packet ID
  ! Type
+
  ! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  ! Default
+
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
  ! Notes
 +
|-
 +
| rowspan="3"| 0x04
 +
| rowspan="3"| Login
 +
| rowspan="3"| Server
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
  | The identifier of the cookie.
 
  |-
 
  |-
  | 6
+
  | colspan="2"| Has Payload
| [[Slot]]
+
  | colspan="2"| Boolean
  |colspan="2"| Firework info
+
  | The payload is only present if the cookie exists on the client.
  | empty
 
 
  |-
 
  |-
| 7
+
  | colspan="2"| Payload
| VarInt
+
  | colspan="2"| Optional ByteArray(5120)
  |colspan="2"| Entity ID of entity which used firework (for elytra boosting)
+
  | The data of the cookie, if any.
| 0
 
|- {{Added}}
 
| 8
 
| Boolean
 
  |colspan="2"| Unknown
 
  | false
 
 
  |}
 
  |}
  
=== Panda ===
+
== Configuration ==
  
Extends [[#Animal|Animal]].
+
=== Clientbound ===
 +
 
 +
==== Cookie Request (configuration) ====
 +
 
 +
Requests a cookie that was previously stored.
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
  ! Index
+
  ! Packet ID
  ! Type
+
  ! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  ! Default
+
  ! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
  ! Notes
 
  |-
 
  |-
  | 13
+
  | rowspan="1"| 0x00
| Integer
+
  | rowspan="1"| Configuration
|colspan="2"| Unknown
+
  | rowspan="1"| Client
  | 0
+
  | colspan="2"| Key
|-
+
  | colspan="2"| Identifier
| 14
+
  | The identifier of the cookie.
| Integer
 
|colspan="2"| Unknown
 
| 0
 
|-
 
| 15
 
  | Integer
 
|colspan="2"| Unknown
 
| 0
 
|-
 
| 16
 
| Byte
 
|colspan="2"| Unknown
 
| 0
 
|-
 
| 17
 
| Byte
 
  |colspan="2"| Unknown
 
| 0
 
|-
 
| 18
 
| Byte
 
  |colspan="2"| Unknown
 
  | 0
 
 
  |}
 
  |}
  
=== Pillager ===
+
==== Store Cookie (configuration) ====
  
Extends [[#Abstract Illager|Abstract Illlager]].
+
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
  ! Index
+
  ! Packet ID
  ! Type
+
  ! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  ! Default
+
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
  ! Notes
 +
|-
 +
| rowspan="2"| 0x09
 +
| rowspan="2"| Configuration
 +
| rowspan="2"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
  | The identifier of the cookie.
 
  |-
 
  |-
  | 13
+
  | colspan="2"| Payload
| Boolean
+
  | colspan="2"| ByteArray(5120)
  | colspan="2"| Unknown
+
  | The data of the cookie.
  | false
 
 
  |}
 
  |}
  
=== Ocelot ===
+
==== Transfer (configuration) ====
  
Extends {{change|[[#TameableAnimal|TameableAnimal]]|[[#Ageable|Ageable]]}}.
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
  ! Index
+
  ! Packet ID
  ! Type
+
  ! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  ! Default
+
  ! colspan="2"| Field Name
  |- {{removed}}
+
! colspan="2"| Field Type
  | 15
+
  ! Notes
  | VarInt
+
  |-
  |colspan="2"| Type (0 = untamed, 1 = tuxedo, 2 = tabby, 3 = siamese).  Used to render regardless as to whether it is tamed or not.
+
  | rowspan="2"| 0x0A
  | 0
+
| rowspan="2"| Configuration
  |- {{added}}
+
  | rowspan="2"| Client
  | 13
+
  | colspan="2"| Host
| Boolean
+
| colspan="2"| String
  |colspan="2"| Unknown
+
  | The hostname of IP of the server.
  | false
+
  |-
 +
  | colspan="2"| Port
 +
  | colspan="2"| VarInt
 +
  | The port of the server.
 
  |}
 
  |}
  
=== Cat ===
+
=== Serverbound ===
 +
 
 +
==== Cookie Response (configuration) ====
  
Extends [[#TameableAnimal|TameableAnimal]].
+
Response to a [[#Cookie_Request_(configuration)|Cookie Request (configuration)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
  
 
{| class="wikitable" {{added}}
 
{| class="wikitable" {{added}}
  ! Index
+
  ! Packet ID
  ! Type
+
  ! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  ! Default
+
  ! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
  ! Notes
 
  |-
 
  |-
  | 15
+
  | rowspan="3"| 0x01
  | VarInt
+
| rowspan="3"| Configuration
  |colspan="2"| Type (0 = tabby, 1 = black, 2 = red, 3 = siamese, 4 = british_shorthair, 5 = calico, 6 = persian, 7 = ragdoll, 8 = white, 9 = all_black)
+
  | rowspan="3"| Server
  | 1
+
  | colspan="2"| Key
 +
| colspan="2"| Identifier
 +
  | The identifier of the cookie.
 
  |-
 
  |-
  | 16
+
  | colspan="2"| Has Payload
| Boolean
+
  | colspan="2"| Boolean
  |colspan="2"| Unknown
+
  | The payload is only present if the cookie exists on the client.
  | false
 
 
  |-
 
  |-
| 17
+
  | colspan="2"| Payload
| Boolean
+
  | colspan="2"| Optional ByteArray(5120)
  |colspan="2"| Unknown
+
  | The data of the cookie, if any.
| false
 
|-
 
| 18
 
| VarInt
 
  |colspan="2"| Unknown
 
  | unknown
 
 
  |}
 
  |}
 
== Block Actions ==
 
 
No changes so far.
 
  
 
== Play ==
 
== Play ==
Line 277: Line 527:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Chunk Data ====
+
==== Cookie Request (play) ====
{{Main|Chunk Format}}
 
{{See also|#Unload Chunk}}
 
  
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).
+
Requests a cookie that was previously stored.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! 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="9"| 0x22
+
  | rowspan="1"| 0x16
  |rowspan="9"| Play
+
  | rowspan="1"| Play
  |rowspan="9"| Client
+
  | rowspan="1"| Client
  | Chunk X
+
  | colspan="2"| Key
  | Int
+
  | colspan="2"| Identifier
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
| The identifier of the cookie.
 +
  |}
 +
 
 +
==== Store Cookie (play) ====
 +
 
 +
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
 +
 
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | Chunk Z
+
  | rowspan="2"| 0x6A
  | Int
+
| rowspan="2"| Play
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
| rowspan="2"| Client
 +
  | colspan="2"| Key
 +
| colspan="2"| Identifier
 +
  | The identifier of the cookie.
 
  |-
 
  |-
  | Ground-Up Continuous
+
  | colspan="2"| Payload
| Boolean
+
  | colspan="2"| ByteArray(5120)
  | See [[Chunk Format#Ground-up continuous|Chunk Format]]
+
  | The data of the cookie.
|-
 
| 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).
 
  |- {{Added}}
 
| Unknown
 
| [[NBT]]
 
|
 
|-
 
| Size
 
| VarInt
 
| Size of Data in bytes
 
|-
 
| Data
 
| Byte array
 
| See [[Chunk Format#Data structure|data structure]] in Chunk Format
 
|-
 
| Number of block entities
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Block entities
 
| Array of [[NBT]]
 
| All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
 
  |}
 
  |}
  
===== Data structure =====
+
==== Transfer (play) ====
  
The data section of the packet contains most of the useful data for the chunk.
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
  |-
+
  ! Packet ID
  ! Field Name
+
! State
  ! Field Type
+
! Bound To
 +
  ! colspan="2"| Field Name
 +
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Data
+
  | rowspan="2"| 0x72
  | Array of [[#Chunk Section structure|Chunk Section]]
+
| rowspan="2"| Play
  | The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
+
| rowspan="2"| Client
 +
  | colspan="2"| Host
 +
| colspan="2"| String
 +
  | The hostname of IP of the server.
 
  |-
 
  |-
  | Biomes
+
  | colspan="2"| Port
  | Optional Int Array
+
  | colspan="2"| VarInt
  | Only sent if Ground-Up Continuous is true; 256 entries if present
+
  | The port of the server.
 
  |}
 
  |}
  
===== Chunk Section structure =====
+
==== Update Attributes ====
  
A Chunk Section is defined in terms of other [[data types]]. A Chunk Section consists of the following fields:
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="6"| 0x71
 +
| rowspan="6"| Play
 +
| rowspan="6"| Client
 +
| colspan="2"| Entity ID
 +
| colspan="2"| VarInt
 +
|
 
  |-
 
  |-
  ! Field Name
+
  | colspan="2"| Number Of Properties
! Field Type
+
  | colspan="2"| VarInt
! Notes
+
  | Number of elements in the following array.
|- {{added}}
 
  | Block count
 
| Short
 
  | Number of non-air blocks present in the chunk section, for lighting purposes.  "Non-air" is defined as any block other than air, cave air, and void air (in particular, note that fluids such as water are still counted).
 
 
  |-
 
  |-
  | Bits Per Block
+
  | rowspan="4"| Property
  | Unsigned Byte
+
| {{change|Key|Id}}
  | Determines how many bits are used to encode a block. Note that not all numbers are valid here.
+
| rowspan="4"| Array
 +
  | {{change|Identifier|VarInt Enum}}
 +
  | See below.
 
  |-
 
  |-
  | Palette
+
  | Value
  | Varies
+
  | Double
  | See below for the format.
+
  | See below.
 
  |-
 
  |-
  | Data Array Length
+
  | Number Of Modifiers
 
  | VarInt
 
  | VarInt
  | Number of longs in the following array
+
  | Number of elements in the following array.
 
  |-
 
  |-
  | Data Array
+
  | Modifiers
  | Array of Long
+
  | Array of Modifier Data
  | Compacted list of 4096 indices pointing to state IDs in the Palette
+
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
|- {{removed}}
 
| Block Light
 
| Byte Array
 
| Half byte per block
 
|- {{removed}}
 
| Sky Light
 
| Optional Byte Array
 
| Only if in the Overworld; half byte per block
 
 
  |}
 
  |}
  
Data Array{{change|, Block Light, and Sky Light are|is}} given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates.  {{change|For the half-byte light arrays, even-indexed items (those with an even x coordinate, starting at 0) are packed into the ''low bits'', odd-indexed into the ''high bits''.}}
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
 
 
==== Entity Sound Effect ====
 
 
 
Plays a sound effect from an entity.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="5"| 0x4E
+
! Id
  |rowspan="5"| Play
+
! Key
  |rowspan="5"| Client
+
! Default
  | Sound ID
+
! Min
  | VarInt
+
! Max
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.13.2.html#sounds events] as of 1.13.2)
+
! Label
 +
|-
 +
| 0
 +
| generic.armor
 +
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor.
 +
|-
 +
| 1
 +
| generic.armor_toughness
 +
| 0.0
 +
| 0.0
 +
| 20.0
 +
| Armor Toughness.
 +
|-
 +
| 2
 +
| generic.attack_damage
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage.
 +
|-
 +
| 3
 +
| generic.attack_knockback
 +
| 0.0
 +
| 0.0
 +
  | 5.0
 +
| Attack Knockback.
 +
|-
 +
| 4
 +
| generic.attack_speed
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed.
 +
|- {{added}}
 +
  | 5
 +
| generic.block_interaction_range
 +
  | 4.5
 +
| 0.0
 +
  | 64.0
 +
| Block Interaction Range.
 +
|- {{added}}
 +
| 6
 +
| generic.entity_interaction_range
 +
| 3.0
 +
| 0.0
 +
| 64.0
 +
| Entity Interaction Range.
 +
|-
 +
| 7
 +
| generic.flying_speed
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed.
 +
|-
 +
| 8
 +
| generic.follow_range
 +
| 32.0
 +
| 0.0
 +
  | 2048.0
 +
  | Follow Range.
 +
|-
 +
| 9
 +
| horse.jump_strength
 +
| 0.7
 +
| 0.0
 +
| 2.0
 +
| Jump Strength.
 +
|-
 +
| 10
 +
| generic.knockback_resistance
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Knockback Resistance.
 +
|-
 +
| 11
 +
| generic.luck
 +
| 0.0
 +
| -1024.0
 +
| 1024.0
 +
| Luck.
 
  |-
 
  |-
  | Sound Category
+
  | 12
  | VarInt Enum
+
  | generic.max_absorption
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
| 0.0
 +
| 0.0
 +
  | 2048.0
 +
| Max Absorption.
 
  |-
 
  |-
  | Entity ID
+
  | 13
  | VarInt
+
  | generic.max_health
  |
+
  | 20.0
 +
| 1.0
 +
| 1024.0
 +
| Max Health.
 
  |-
 
  |-
  | Volume
+
  | 14
  | Float
+
  | generic.movement_speed
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
+
  | 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed.
 +
|- {{added}}
 +
| 15
 +
| generic.scale
 +
| 1.0
 +
| 0.0625
 +
| 16.0
 +
| Scale.
 
  |-
 
  |-
  | Pitch
+
  | 16
  | Float
+
  | zombie.spawn_reinforcements
  | Float between 0.5 and 2.0 by Notchian clients
+
| 0.0
 +
  | 0.0
 +
| 1.0
 +
| Spawn Reinforcements Chance.
 +
|- {{added}}
 +
| 17
 +
| generic.step_height
 +
| 0.6
 +
| 0.0
 +
| 10.0
 +
| Step Height.
 
  |}
 
  |}
  
==== Tags ====
+
''Modifier Data'' structure:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  |-
! State
 
! Bound To
 
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| {{Change|0x55|0x56}}
+
  | UUID
|rowspan="4"| Play
+
  | UUID
|rowspan="4"| Client
+
  |
| Block Tags
 
  | (See below)
 
  | IDs are block IDs
 
 
  |-
 
  |-
  | Item Tags
+
  | Amount
  | (See below)
+
  | Double
  | IDs are item IDs
+
  | May be positive or negative.
 
  |-
 
  |-
  | Fluid Tags
+
  | Operation
  | (See below)
+
  | Byte
| IDs are fluid IDs
+
  | See below.
|- {{added}}
 
| Entity Tags
 
  | (See below)
 
| IDs are entity type IDs
 
 
  |}
 
  |}
  
==== Update Light ====
+
The operation controls how the base value of the modifier is changed.
 +
 
 +
* 0: Add/subtract amount
 +
* 1: Add/subtract amount percent of the current value
 +
* 2: Multiply by amount percent
 +
 
 +
All of the 0's are applied first, and then the 1's, and then the 2's.
  
Updates light levels for a chunk.
+
==== Entity Effect ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 469: Line 814:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x57
+
  | rowspan="7"| 0x72
  |rowspan="8"| Play
+
  | rowspan="7"| Play
  |rowspan="8"| Client
+
  | rowspan="7"| Client
  | Chunk X
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  |
 
  |-
 
  |-
  | Chunk Z
+
  | Effect ID
 
  | VarInt
 
  | VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | See {{Minecraft Wiki|Status effect#Effect list|this table}}.
 
  |-
 
  |-
  | Sky Light Mask
+
  | Amplifier
 +
| Byte
 +
| Notchian client displays effect level as Amplifier + 1.
 +
|-
 +
| Duration
 
  | VarInt
 
  | 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)
+
  | Duration in ticks. (-1 for infinite)
 +
|-
 +
| Flags
 +
| Byte
 +
| Bit field, see below.
 +
|- {{removed}}
 +
| Has Factor Data
 +
| Boolean
 +
| Used in DARKNESS effect
 +
|- {{removed}}
 +
| Factor Codec
 +
| NBT Tag
 +
| See below
 +
|}
 +
 
 +
{{Need Info|What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?}}
 +
 
 +
Within flags:
 +
 
 +
* 0x01: Is ambient - was the effect spawned from a beacon?  All beacon-generated effects are ambient.  Ambient effects use a different icon in the HUD (blue border rather than gray).  If all effects on an entity are ambient, the [[Entity_metadata#Living Entity|"Is potion effect ambient" living metadata field]] should be set to true.  Usually should not be enabled.
 +
* 0x02: Show particles - should all particles from this effect be hidden?  Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory).  Usually should be enabled.
 +
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
 +
* {{change||0x08: Blend - should the effect's hard-coded blending be applied?  Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.}}
 +
 
 +
{{change|Factor Data|}}
 +
{| class="wikitable" {{removed}}
 +
!Name
 +
!Type
 +
!style="width: 250px;" colspan="2"| Notes
 
  |-
 
  |-
  | Block Light Mask
+
  | padding_duration
  | VarInt
+
  | TAG_INT
  | Mask containing 18 bits, with the same order as sky light
+
|
 +
|-
 +
| factor_start
 +
| TAG_FLOAT
 +
  |
 
  |-
 
  |-
  | Unknown 1
+
  | factor_target
  | VarInt
+
  | TAG_FLOAT
 
  |
 
  |
 
  |-
 
  |-
  | Unknown 2
+
  | factor_current
  | VarInt
+
  | TAG_FLOAT
 
  |
 
  |
 
  |-
 
  |-
  | Sky Light arrays
+
  | effect_changed_timestamp
  | Array of arrays of 2048 bytes
+
  | TAG_INT
| 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 arrays
+
  | factor_previous_frame
  | Array of arrays of 2048 bytes
+
  | TAG_FLOAT
  | 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.
+
  |-
 +
  | had_effect_last_tick
 +
| TAG_BOOLEAN
 
  |}
 
  |}
 
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.
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
No changes so far.
+
==== Cookie Response (play) ====
  
== Handshaking ==
+
Response to a [[#Cookie_Request_(play)|Cookie Request (play)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
  
=== Clientbound ===
+
{| class="wikitable" {{added}}
 
 
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.
 
 
 
{| 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="4"| 0x00
+
  | rowspan="3"| 0x6A
  |rowspan="4"| Handshaking
+
  | rowspan="3"| Play
  |rowspan="4"| Server
+
  | rowspan="3"| Server
  | Protocol Version
+
  | colspan="2"| Key
  | VarInt
+
  | colspan="2"| Identifier
  | See [[protocol version numbers]] (currently {{change|404|443}})
+
  | The identifier of the cookie.
 
  |-
 
  |-
  | Server Address
+
  | colspan="2"| Has Payload
| String
+
  | colspan="2"| Boolean
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect.  The Notchian server does not use this information.
+
  | The payload is only present if the cookie exists on the client.
|-
 
  | Server Port
 
| Unsigned Short
 
| Default is 25565.  The Notchian server does not use this information.
 
 
  |-
 
  |-
  | Next State
+
  | colspan="2"| Payload
  | VarInt Enum
+
  | colspan="2"| Optional ByteArray(5120)
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
+
  | The data of the cookie, if any.
 
  |}
 
  |}
 
== Status ==
 
 
=== Clientbound ===
 
 
No changes so far.
 
 
=== Serverbound ===
 
 
No changes so far.
 
 
== Login ==
 
 
=== Clientbound ===
 
 
No changes so far.
 
 
=== Serverbound ===
 
 
No changes so far.
 
 
  
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Revision as of 05:25, 26 February 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.4, protocol 765) to the current pre-release (currently 24w03b, protocol Snapshot 172). 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
Handshake serverbound
0x00 Handshake Current Pre
Login clientbound
0x05 Cookie Request (login) Pre
Login serverbound
0x04 Cookie Response (login) Pre
Configuration clientbound
0x00 Cookie Request (configuration) Pre
0x00 0x01 Clientbound Plugin Message (configuration) Current (unchanged)
0x01 0x02 Disconnect (configuration) Current (unchanged)
0x02 0x03 Finish Configuration Current (unchanged)
0x03 0x04 Clientbound Keep Alive (configuration) Current (unchanged)
0x04 0x05 Ping (configuration) Current (unchanged)
0x05 0x06 Registry Data Current (unchanged)
0x06 0x07 Remove Resource Pack (configuration) Current (unchanged)
0x07 0x08 Add Resource Pack (configuration) Current (unchanged)
0x09 Store Cookie (configuration) Pre
0x0A Transfer (configuration) Pre
0x08 0x0B Feature Flags Current (unchanged)
0x09 0x0C Update Tags (configuration) Current (unchanged)
Configuration serverbound
0x01 Cookie Response (configuration) Pre
0x01 0x02 Serverbound Plugin Message (configuration) Current (unchanged)
0x02 0x03 Finish Configuration Current (unchanged)
0x03 0x04 Serverbound Keep Alive (configuration) Current (unchanged)
0x04 0x05 Pong (configuration) Current (unchanged)
0x05 0x06 Resource Pack Response (configuration) Current (unchanged)
Play clientbound
0x16 Cookie Request (Play) Pre
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Chat Suggestions Current (unchanged)
0x18 0x19 Clientbound Plugin Message (play) Current (unchanged)
0x19 0x1A Damage Event Current (unchanged)
0x1A 0x1B Delete Message Current (unchanged)
0x1B 0x1C Disconnect (play) Current (unchanged)
0x1C 0x1D Disguised Chat Message Current (unchanged)
0x1D 0x1E Entity Event Current (unchanged)
0x1E 0x1F Explosion Current (unchanged)
0x1F 0x20 Unload Chunk Current (unchanged)
0x20 0x21 Game Event Current (unchanged)
0x21 0x22 Open Horse Screen Current (unchanged)
0x22 0x23 Hurt Animation Current (unchanged)
0x23 0x24 Initialize World Border Current (unchanged)
0x24 0x25 Clientbound Keep Alive (play) Current (unchanged)
0x25 0x26 Chunk Data and Update Light Current (unchanged)
0x26 0x27 World Event Current (unchanged)
0x27 0x28 Particle Current (unchanged)
0x28 0x29 Update Light Current (unchanged)
0x29 0x2A Login (play) Current (unchanged)
0x2A 0x2B Map Data Current (unchanged)
0x2B 0x2C Merchant Offers Current (unchanged)
0x2C 0x2D Update Entity Position Current (unchanged)
0x2D 0x2E Update Entity Position and Rotation Current (unchanged)
0x2E 0x2F Update Entity Rotation Current (unchanged)
0x2F 0x30 Move Vehicle Current (unchanged)
0x30 0x31 Open Book Current (unchanged)
0x31 0x32 Open Screen Current (unchanged)
0x32 0x33 Open Sign Editor Current (unchanged)
0x33 0x34 Ping (play) Current (unchanged)
0x34 0x35 Ping Response (play) Current (unchanged)
0x35 0x36 Place Ghost Recipe Current (unchanged)
0x36 0x37 Player Abilities Current (unchanged)
0x37 0x38 Player Chat Message Current (unchanged)
0x38 0x39 End Combat Current (unchanged)
0x39 0x3A Enter Combat Current (unchanged)
0x3A 0x3B Combat Death Current (unchanged)
0x3B 0x3C Player Info Remove Current (unchanged)
0x3C 0x3D Player Info Update Current (unchanged)
0x3D 0x3E Look At Current (unchanged)
0x3E 0x3F Synchronize Player Position Current (unchanged)
0x3F 0x40 Update Recipe Book Current (unchanged)
0x40 0x41 Remove Entities Current (unchanged)
0x41 0x42 Remove Entity Effect Current (unchanged)
0x42 0x43 Reset Score Current (unchanged)
0x43 0x44 Remove Resource Pack (play) Current (unchanged)
0x44 0x45 Add Resource Pack (play) Current (unchanged)
0x45 0x46 Respawn Current (unchanged)
0x46 0x47 Set Head Rotation Current (unchanged)
0x47 0x48 Update Section Blocks Current (unchanged)
0x48 0x49 Select Advancements Tab Current (unchanged)
0x49 0x4A Server Data Current (unchanged)
0x4A 0x4B Set Action Bar Text Current (unchanged)
0x4B 0x4C Set Border Center Current (unchanged)
0x4C 0x4D Set Border Lerp Size Current (unchanged)
0x4D 0x4E Set Border Size Current (unchanged)
0x4E 0x4F Set Border Warning Delay Current (unchanged)
0x4F 0x50 Set Border Warning Distance Current (unchanged)
0x50 0x51 Set Camera Current (unchanged)
0x51 0x52 Set Held Item Current (unchanged)
0x52 0x53 Set Center Chunk Current (unchanged)
0x53 0x54 Set Render Distance Current (unchanged)
0x54 0x55 Set Default Spawn Position Current (unchanged)
0x55 0x56 Display Objective Current (unchanged)
0x56 0x57 Set Entity Metadata Current (unchanged)
0x57 0x58 Link Entities Current (unchanged)
0x58 0x59 Set Entity Velocity Current (unchanged)
0x59 0x5A Set Equipment Current (unchanged)
0x5A 0x5B Set Experience Current (unchanged)
0x5B 0x5C Set Health Current (unchanged)
0x5C 0x5D Update Objectives Current (unchanged)
0x5D 0x5E Set Passengers Current (unchanged)
0x5E 0x5F Update Teams Current (unchanged)
0x5F 0x60 Update Score Current (unchanged)
0x60 0x61 Set Simulation Distance Current (unchanged)
0x61 0x62 Set Subtitle Text Current (unchanged)
0x62 0x63 Update Time Current (unchanged)
0x63 0x64 Set Title Text Current (unchanged)
0x64 0x65 Set Title Animation Times Current (unchanged)
0x65 0x66 Entity Sound Effect Current (unchanged)
0x66 0x67 Sound Effect Current (unchanged)
0x67 0x68 Start Configuration Current (unchanged)
0x68 0x69 Stop Sound Current (unchanged)
0x6A Store Cookie (Play) Pre
0x69 0x6B System Chat Message Current (unchanged)
0x6A 0x6C Set Tab List Header And Footer Current (unchanged)
0x6B 0x6D Tag Query Response Current (unchanged)
0x6C 0x6E Pickup Item Current (unchanged)
0x6D 0x6F Teleport Entity Current (unchanged)
0x6E 0x70 Set Ticking State Current (unchanged)
0x6F 0x71 Step Tick Current (unchanged)
0x72 Transfer (Play) Pre
0x70 0x73 Update Advancements Current (unchanged)
0x71 0x74 Update Attributes Current Pre
0x72 0x75 Entity Effect Current Pre
0x73 0x76 Update Recipes Current (unchanged)
0x74 0x77 Update Tags (play) Current (unchanged)
Play serverbound
0x10 Cookie Response (play) Pre
0x10 0x11 Serverbound Plugin Message (play) Current (unchanged)
0x11 0x12 Edit Book Current (unchanged)
0x12 0x13 Query Entity Tag Current (unchanged)
0x13 0x14 Interact Current (unchanged)
0x14 0x15 Jigsaw Generate Current (unchanged)
0x15 0x16 Serverbound Keep Alive (play) Current (unchanged)
0x16 0x17 Lock Difficulty Current (unchanged)
0x17 0x18 Set Player Position Current (unchanged)
0x18 0x19 Set Player Position and Rotation Current (unchanged)
0x19 0x1A Set Player Rotation Current (unchanged)
0x1A 0x1B Set Player On Ground Current (unchanged)
0x1B 0x1C Move Vehicle Current (unchanged)
0x1C 0x1D Paddle Boat Current (unchanged)
0x1D 0x1E Pick Item Current (unchanged)
0x1E 0x1F Ping Request (play) Current (unchanged)
0x1F 0x20 Place Recipe Current (unchanged)
0x20 0x21 Player Abilities Current (unchanged)
0x21 0x22 Player Action Current (unchanged)
0x22 0x23 Player Command Current (unchanged)
0x23 0x24 Player Input Current (unchanged)
0x24 0x25 Pong (play) Current (unchanged)
0x25 0x26 Change Recipe Book Settings Current (unchanged)
0x26 0x27 Set Seen Recipe Current (unchanged)
0x27 0x28 Rename Item Current (unchanged)
0x28 0x29 Resource Pack Response (play) Current (unchanged)
0x29 0x2A Seen Advancements Current (unchanged)
0x2A 0x2B Select Trade Current (unchanged)
0x2B 0x2C Set Beacon Effect Current (unchanged)
0x2C 0x2D Set Held Item Current (unchanged)
0x2D 0x2E Program Command Block Current (unchanged)
0x2E 0x2F Program Command Block Minecart Current (unchanged)
0x2F 0x30 Set Creative Mode Slot Current (unchanged)
0x30 0x31 Program Jigsaw Block Current (unchanged)
0x31 0x32 Program Structure Block Current (unchanged)
0x32 0x33 Update Sign Current (unchanged)
0x33 0x34 Swing Arm Current (unchanged)
0x34 0x35 Teleport To Entity Current (unchanged)
0x35 0x36 Use Item On Current (unchanged)
0x36 0x37 Use Item Current (unchanged)

New/modified data types

No changes so far.

Entity Metadata

Type Name Value Notes
0 Byte Byte
1 VarInt VarInt
2 VarLong VarLong
3 Float Float
4 String String
5 Text Component Text Component
6 Optional Text Component (Boolean, Optional Text Component) Text Component is present if the Boolean is set to true.
7 Slot Slot
8 Boolean Boolean
9 Rotations (Float, Float, Float) rotation on x, rotation on y, rotation on z
10 Position Position
11 Optional Position (Boolean, Optional Position) Position is present if the Boolean is set to true.
12 Direction VarInt Enum Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
13 Optional UUID (Boolean, Optional UUID) UUID is present if the Boolean is set to true.
14 Block State VarInt An ID in the block state registry.
15 Optional Block State VarInt 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
16 NBT NBT
17 Particle (VarInt, Varies) particle type (an ID in the minecraft:particle_type registry), particle data (See Particles.)
18 Villager Data (VarInt, VarInt, VarInt) villager type, villager profession, level (See below.)
19 Optional VarInt VarInt 0 for absent; 1 + actual value otherwise. Used for entity IDs.
20 Pose VarInt Enum STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14, SLIDING = 15, SHOOTING = 16, INHALING = 17
21 Cat Variant VarInt An ID in the minecraft:cat_variant registry.
22 Frog Variant VarInt An ID in the minecraft:frog_variant registry.
23 Optional Global Position (Boolean, Optional Identifier, Optional Position) dimension identifier, position; only if the Boolean is set to true.
24 Painting Variant VarInt An ID in the minecraft:painting_variant registry.
25 Sniffer State VarInt Enum IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
26 Armadillo State VarInt Enum IDLE = 0, ROLLING = 1, SCARED = 2
26 27 Vector3 (Float, Float, Float) x, y, z
27 28 Quaternion (Float, Float, Float, Float) x, y, z, w

Armadillo

Extends Animal.

Index Type Meaning Default
17 Armadillo State (26) Armadillo State IDLE

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Handshake

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 765 in Minecraft 1.20.4).
Server Address String (255) 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 simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide 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, 3 for Transfer.

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

Cookie Request (login)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x05 Login Client Key Identifier The identifier of the cookie.

Serverbound

Cookie Response (login)

Response to a Cookie Request (login) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x04 Login Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Optional ByteArray(5120) The data of the cookie, if any.

Configuration

Clientbound

Cookie Request (configuration)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x00 Configuration Client Key Identifier The identifier of the cookie.

Store Cookie (configuration)

Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x09 Configuration Client Key Identifier The identifier of the cookie.
Payload ByteArray(5120) The data of the cookie.

Transfer (configuration)

Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.

Packet ID State Bound To Field Name Field Type Notes
0x0A Configuration Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

Serverbound

Cookie Response (configuration)

Response to a Cookie Request (configuration) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x01 Configuration Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Optional ByteArray(5120) The data of the cookie, if any.

Play

Clientbound

Cookie Request (play)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x16 Play Client Key Identifier The identifier of the cookie.

Store Cookie (play)

Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x6A Play Client Key Identifier The identifier of the cookie.
Payload ByteArray(5120) The data of the cookie.

Transfer (play)

Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.

Packet ID State Bound To Field Name Field Type Notes
0x72 Play Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

Update Attributes

Sets attributes on the given entity.

Packet ID State Bound To Field Name Field Type Notes
0x71 Play Client Entity ID VarInt
Number Of Properties VarInt Number of elements in the following array.
Property Key Id Array Identifier VarInt Enum See below.
Value Double See below.
Number Of Modifiers VarInt Number of elements in the following array.
Modifiers Array of Modifier Data See Attribute#Modifiers. Modifier Data defined below.

Known Key values (see also Attribute#Modifiers):

Id Key Default Min Max Label
0 generic.armor 0.0 0.0 30.0 Armor.
1 generic.armor_toughness 0.0 0.0 20.0 Armor Toughness.
2 generic.attack_damage 2.0 0.0 2048.0 Attack Damage.
3 generic.attack_knockback 0.0 0.0 5.0 Attack Knockback.
4 generic.attack_speed 4.0 0.0 1024.0 Attack Speed.
5 generic.block_interaction_range 4.5 0.0 64.0 Block Interaction Range.
6 generic.entity_interaction_range 3.0 0.0 64.0 Entity Interaction Range.
7 generic.flying_speed 0.4 0.0 1024.0 Flying Speed.
8 generic.follow_range 32.0 0.0 2048.0 Follow Range.
9 horse.jump_strength 0.7 0.0 2.0 Jump Strength.
10 generic.knockback_resistance 0.0 0.0 1.0 Knockback Resistance.
11 generic.luck 0.0 -1024.0 1024.0 Luck.
12 generic.max_absorption 0.0 0.0 2048.0 Max Absorption.
13 generic.max_health 20.0 1.0 1024.0 Max Health.
14 generic.movement_speed 0.7 0.0 1024.0 Movement Speed.
15 generic.scale 1.0 0.0625 16.0 Scale.
16 zombie.spawn_reinforcements 0.0 0.0 1.0 Spawn Reinforcements Chance.
17 generic.step_height 0.6 0.0 10.0 Step Height.

Modifier Data structure:

Field Name Field Type Notes
UUID UUID
Amount Double May be positive or negative.
Operation Byte See below.

The operation controls how the base value of the modifier is changed.

  • 0: Add/subtract amount
  • 1: Add/subtract amount percent of the current value
  • 2: Multiply by amount percent

All of the 0's are applied first, and then the 1's, and then the 2's.

Entity Effect

Packet ID State Bound To Field Name Field Type Notes
0x72 Play Client Entity ID VarInt
Effect ID VarInt See this table.
Amplifier Byte Notchian client displays effect level as Amplifier + 1.
Duration VarInt Duration in ticks. (-1 for infinite)
Flags Byte Bit field, see below.
Has Factor Data Boolean Used in DARKNESS effect
Factor Codec NBT Tag See below
Huh.png The following information needs to be added to this page:
What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?

Within flags:

  • 0x01: Is ambient - was the effect spawned from a beacon? All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray). If all effects on an entity are ambient, the "Is potion effect ambient" living metadata field should be set to true. Usually should not be enabled.
  • 0x02: Show particles - should all particles from this effect be hidden? Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory). Usually should be enabled.
  • 0x04: Show icon - should the icon be displayed on the client? Usually should be enabled.
  • 0x08: Blend - should the effect's hard-coded blending be applied? Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.

Factor Data

Name Type Notes
padding_duration TAG_INT
factor_start TAG_FLOAT
factor_target TAG_FLOAT
factor_current TAG_FLOAT
effect_changed_timestamp TAG_INT
factor_previous_frame TAG_FLOAT
had_effect_last_tick TAG_BOOLEAN

Serverbound

Cookie Response (play)

Response to a Cookie Request (play) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x6A Play Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Optional ByteArray(5120) The data of the cookie, if any.