Difference between revisions of "Object Data"

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In the [[Protocol#Spawn Object|Spawn Object]] packet, additional metadata about the spawned entity may be provided. The length and contents of this extra data depend on the type of object being spawned. No matter what, the server must send at least one integer to the client, although 0 is a valid value. If a number other than zero is provided (for all entities), the following data is appended to the end of the object data (as of [[Protocol version numbers|15w31a, protocol 49]] this data is always required):
+
This article documents the '''Data''' field in the [[Protocol#Spawn Entity|Spawn Entity]] packet. The field is of type Int, and the meaning of its contents depend on the [[Entity_metadata|type of entity]] being spawned, as defined in the Type field of the same packet, and is documented below.
 +
 
 +
== [[Entity_metadata#Item_Frame|Item Frame]] ==
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  |-
 
  |-
−
  ! Field name
+
  ! Value
−
  ! Field type
+
  ! Orientation
−
  ! Example
+
  |-
−
  ! Notes
+
| 0
 +
| Down
 +
|-
 +
| 1
 +
| Up
 +
|-
 +
| 2
 +
| North
 +
|-
 +
| 3
 +
  | South
 
  |-
 
  |-
−
  | Speed X
+
  | 4
−
  | Short
+
  | West
−
| <code>0</code>
 
−
| The speed of the object, same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
−
|-�
 
−
| Speed Y
 
−
| Short
 
−
| <code>0</code>
 
−
| The speed of the object, same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
 
  |-
 
  |-
−
  | Speed Z
+
  | 5
−
  | Short
+
  | East
−
| <code>0</code>
 
−
| The speed of the object, same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
 
  |}
 
  |}
  
−
== Meaning of int field ==
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The Notchian client clamps invalid values into the valid range through the modulus operator. If the resulting value is negative, the absolute value is used.
  
−
=== Minecarts (id 10) ===
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Velocity in the packet is always ignored.
  
−
The int value itself specifies the minecart's functionality:
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== [[Entity_metadata#Painting|Painting]] ==
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  |-
 
  |-
 
  ! Value
 
  ! Value
−
  ! Minecart functionality
+
  ! Orientation
−
|-
 
−
| 0
 
−
| Empty (ride-able) minecart
 
−
|-
 
−
| 1
 
−
| Chest minecart
 
 
  |-
 
  |-
 
  | 2
 
  | 2
−
  | Furnace (powered) minecart
+
  | North
 
  |-
 
  |-
 
  | 3
 
  | 3
−
  | TNT minecart
+
  | South
 
  |-
 
  |-
 
  | 4
 
  | 4
−
  | Spawner minecart
+
  | West
−
  |-�
+
  |-
 
  | 5
 
  | 5
−
  | Hopper minecart
+
  | East
−
|-
 
−
| 6
 
−
| Command Block minecart
 
 
  |}
 
  |}
  
−
=== Item Frame (id 71) ===
+
The Notchian client clamps invalid values into the valid range through the modulus operator. If the resulting value is negative, the absolute value is used.
 +
 
 +
{{Warning|Although the values of 0 and 1 are invalid, the Notchian client uses the same clamping algorithm as [[#Item_Frame|Item Frame]], which can result in any value from 0 to 5. If the resulting value is invalid, the entity will fail to spawn.}}
 +
 
 +
Velocity in the packet is always ignored.
 +
 
 +
== [[Entity_metadata#Falling_Block|Falling Block]] ==
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Field name
 
  ! Field name
 
  ! Field type
 
  ! Field type
−
! Example
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  | Orientation
+
  | Block state ID
−
  | Int
+
  | {{Type|Int}}
−
  | <code>3</code>
+
  | ID of the block state that the falling block will represent.
−
| 0–3: South, West, North, East
 
 
  |}
 
  |}
  
−
=== Falling Block (id 70) ===
+
Velocity in the packet is always ignored.
 +
 
 +
== [[Entity_metadata#Fishing_Hook|Fishing Hook]] ==
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|-
 
 
  ! Field name
 
  ! Field name
 
  ! Field type
 
  ! Field type
−
! Example
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  | Block type
+
  | Owner
−
  | Int
+
  | {{Type|Int}}
−
  | <code>12</code>
+
  | The entity ID of the owner
−
| <code>BlockID | (Metadata << 0x10)</code>
 
 
  |}
 
  |}
  
−
=== Splash Potions (id 73) ===
+
{{Warning|If the entity with the Owner ID doesn't exist in the client, the entity will fail to spawn.}}
  
−
{| class="wikitable"
+
Velocity in the packet is ignored, and instead should be inferred from the shooter's position.
−
|-
 
−
! Field name
 
−
! Field type
 
−
! Example
 
−
! Notes
 
−
|-
 
−
| Entity ID
 
−
| Int
 
−
| <code>64</code>
 
−
| Potion data value
 
−
|}
 
  
−
For more information on potion data values, see {{Minecraft Wiki|Data values#Potions}}.
+
{{Need Info|What's the exact algorithm for determining this?}}
  
−
=== Fishing Float (id 90) ===
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== [[Entity_metadata#Projectile|Projectile]] ==
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
|-
 
  ! Field name
 
  ! Field name
 
  ! Field type
 
  ! Field type
−
! Example
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  | Owner
+
  | Owner ID
−
  | Int
+
  | {{Type|Int}}
−
|
 
 
  | The entity ID of the owner
 
  | The entity ID of the owner
 
  |}
 
  |}
  
−
=== Projectiles ([[Entities#Objects|Any projectile]]) ===
+
== [[Entity_metadata#Warden|Warden]] ==
−
 
 
−
This includes ghast fireballs, arrows, and fishhooks (probably more).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Field name
 
  ! Field name
 
  ! Field type
 
  ! Field type
−
! Example
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  | Entity ID
+
  | Pose
−
  | Int
+
  | {{Type|Int}}
−
  | <code>64</code>
+
  | If a value of 1 is specified, the Warden will spawn in the [[Entity_metadata#Entity_Metadata_Format|emerging pose]].
−
| The entity ID of the thrower
+
Any other value is silently ignored.
 
  |}
 
  |}
 +
 +
 +
[[Category:Protocol Details]]
 +
[[Category:Minecraft Modern]]

Latest revision as of 22:32, 24 February 2024

This article documents the Data field in the Spawn Entity packet. The field is of type Int, and the meaning of its contents depend on the type of entity being spawned, as defined in the Type field of the same packet, and is documented below.

Item Frame

Value Orientation
0 Down
1 Up
2 North
3 South
4 West
5 East

The Notchian client clamps invalid values into the valid range through the modulus operator. If the resulting value is negative, the absolute value is used.

Velocity in the packet is always ignored.

Painting

Value Orientation
2 North
3 South
4 West
5 East

The Notchian client clamps invalid values into the valid range through the modulus operator. If the resulting value is negative, the absolute value is used.

Warning.png Although the values of 0 and 1 are invalid, the Notchian client uses the same clamping algorithm as Item Frame, which can result in any value from 0 to 5. If the resulting value is invalid, the entity will fail to spawn.

Velocity in the packet is always ignored.

Falling Block

Field name Field type Notes
Block state ID Int ID of the block state that the falling block will represent.

Velocity in the packet is always ignored.

Fishing Hook

Field name Field type Notes
Owner Int The entity ID of the owner

Warning.png If the entity with the Owner ID doesn't exist in the client, the entity will fail to spawn.

Velocity in the packet is ignored, and instead should be inferred from the shooter's position.

Huh.png The following information needs to be added to this page:
What's the exact algorithm for determining this?

Projectile

Field name Field type Notes
Owner ID Int The entity ID of the owner

Warden

Field name Field type Notes
Pose Int If a value of 1 is specified, the Warden will spawn in the emerging pose.

Any other value is silently ignored.

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