Pre-release protocol

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Revision as of 06:56, 7 March 2013 by Thinkofdeath (talk | contribs) (→‎New Packets: Added new particle packet)
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This page documents the changes from the last stable Minecraft release (currently 1.4.6, protocol 51) to the current pre-release (or weekly release). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

New Packets

Particle (0x3F)

Server to Client

This displays the named particle

Packet ID Field Name Field Type Example Notes
0x3F Particle name string hugeexplosion The name of the particle to create
X float 0 X position of the particle
Y float 0 Y position of the particle
Z float 0 Z position of the particle
Offset X float 0 This is added to the X position after being multiplied by random.nextGaussian()
Offset Y float 0 This is added to the Y position after being multiplied by random.nextGaussian()
Offset Z float 0 This is added to the Z position after being multiplied by random.nextGaussian()
Particle speed float 0 The speed of each particle
Number of particles int 0 The number of particles to create
Total Size: 34 bytes + length of string

Create Scoreboard (0xCE)

Server to Client

This is sent to the client when it should create a new scoreboard or remove one.

Packet ID Field Name Field Type Example Notes
0xCE Scoreboard Name string deaths An unique name for the scoreboard.
Scoreboard Display Text string Deaths The text to be displayed for the score.
Create/Remove byte 0 0 to create the scoreboard. 1 to remove the scoreboard .
Total Size: 5 bytes + length of string

Update Score (0xCF)

Server to Client

This is sent to the client when it should update a scoreboard item.

Packet ID Field Name Field Type Example Notes
0xCF Item Name string Bob An unique name to be displayed in the list.
Update/Remove byte 0 0 to create/update an item. 1 to remove an item.
Score Name string deaths The unique name for the scoreboard to be updated. Only sent to Update/Remove equals 0.
Value integer 5 The score to be displayed next to the entry. Only sent to Update/Remove equals 0.
Total Size: 9 bytes + length of strings

Display Scoreboard (0xD0)

Server to Client

This is sent to the client when it should display a scoreboard.

Packet ID Field Name Field Type Example Notes
0xD0 Position byte 1 The position of the scoreboard. 0 = list, 1 = sidebar, 2 = belowName.
Score Name string deaths The unique name for the scoreboard to be displayed.
Total Size: 3 bytes + length of string

Teams (0xD1)

Server to Client

Creates and updates teams.

Packet ID Field Name Field Type Example Notes
0xD1 Team Name string mcdevs An unique name for the team. (Shared with scoreboard).
Mode byte 0 If 0 then the team is created.

If 1 then the team is removed.

If 2 the team team information is updated.

If 3 then new players are added to the team.

If 4 then players are removed from the team.

Team Display Name string McDevs Only if Mode = 0 or 2.
Team Prefix string Only if Mode = 0 or 2. Displayed before the players' name that are part of this team.
Team Suffix string Only if Mode = 0 or 2. Displayed after the players' name that are part of this team.
Friendly fire byte 0 Only if Mode = 0 or 2.
Player count short 0 Only if Mode = 0 or 3 or 4. Number of players in the array
Players Array of strings Only if Mode = 0 or 3 or 4. Players to be added/remove from the team.
Total Size: Variable

Changed Packets

Open Window (0x64)

Server to Client

This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.

Packet ID Field Name Field Type Example Notes
0x64 Window id byte 123 A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
Inventory Type byte 2 The window type to use for display. Check below
Window title string Chest The title of the window.
Number of Slots byte 3 Number of slots in the window (excluding the number of slots in the player inventory).
Use provided window title boolean 1 If false, the client will look up a string like "window.minecart". If true, the client uses what the server provides.
Total Size: 6 bytes + length of string

Changed Data Types

Entity Metadata

Mobs

Index 5, string: Mob Name

The name to be displayed on the nameplate above the entity (If Show nameplate = 1).

Index 6, byte: Show nameplate

Set to 1 to show the nameplate, otherwise it is not displayed.

Minecart

Index 20, int: Block id & metadata

The id and metadata of the block to be shown in the minecart (If Show block = 1).

The block id can be obtained by: value & 0xFFFF.

The block metadata can be obtained by: value >> 16.

Index 21, int: Block position

The position (Y axis) of the block in the minecart. (Default: 6)

Index 22, byte: Show block

Set to 1 to show the block in the minecart, otherwise the block is not displayed.

Removed Packets

-None-

Protocol History

13w09c: Protocol version is now 60.

13w09b: Protocol version is now 59.

13w06a: Protocol version is now 57 58 (Changed after bug fix, version is still 13w06a).

13w05b: Protocol version is now 57.

13w05a: Protocol version is now 56. New packets for teams.

13w04a: Protocol version is now 55. New packets for scoreboards.

13w03a: Protocol version is now 54.

13w02a: Protocol version is now 53. All Minecart entities use object type 10, and send the block within seperately. Minecarts now send their type as object data in 0x17.

13w01a: Protocol version is now 52. Added boolean to 0x64 (Open Window) to determine whether or not to use the provided window title.