Difference between revisions of "Object Data"

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This article documents the '''Data''' field in the [[Protocol#Spawn Object|Spawn Object]] packet. The field is of type Int, and the meaning of its contents depend on the [[Entities#Objects|type of object]] being spawned, as defined in the Type field of the same packet, and is documented below.
 
This article documents the '''Data''' field in the [[Protocol#Spawn Object|Spawn Object]] packet. The field is of type Int, and the meaning of its contents depend on the [[Entities#Objects|type of object]] being spawned, as defined in the Type field of the same packet, and is documented below.
 +
 +
In some cases, the data field has no meaning, but is only used to indicate presence of velocity.  In others, it (and velocity) is always ignored.
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== Item (id 2) ==
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 +
The int value is ignored, but should be set to <code>1</code> to indicate that velocity is present.
  
 
== Minecarts (id 10) ==
 
== Minecarts (id 10) ==
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{| class="wikitable"
 
{| class="wikitable"
 
  |-
 
  |-
  ! Field name
+
  ! Value
  ! Field type
+
  ! Orientation
  ! Example
+
  |-
  ! Notes
+
| 0
 +
| Down
 +
|-
 +
| 1
 +
| Up
 +
|-
 +
| 2
 +
| North
 +
|-
 +
| 3
 +
| South
 +
|-
 +
| 4
 +
  | West
 
  |-
 
  |-
  | Orientation
+
  | 5
  | Int
+
  | East
| <code>3</code>
 
| 0–3: South, West, North, East
 
 
  |}
 
  |}
 +
You have to set both Orientation and Yaw/Pitch accordingly, otherwise it will not work.
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 +
Velocity in the packet is always ignored.
  
 
== Falling Block (id 70) ==
 
== Falling Block (id 70) ==
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  | Int
 
  | Int
 
  | <code>12</code>
 
  | <code>12</code>
  | <code>BlockID | (Metadata << 0x10)</code>
+
  | <code><nowiki>BlockID | (Metadata << 12)</nowiki></code>
 
  |}
 
  |}
  
== Splash Potions (id 73) ==
+
Velocity in the packet is always ignored.
 
 
{| class="wikitable"
 
|-
 
! 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}}.
 
  
 
== Fishing Float (id 90) ==
 
== Fishing Float (id 90) ==
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  |}
 
  |}
  
== Projectiles ([[Entities#Objects|Any projectile]]) ==
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Velocity in the packet is ignored, and instead should be inferred from the shooter's position.
 +
 
 +
{{Need Info|What's the exact algorithm for determining this?}}
  
This includes ghast fireballs, arrows, and fishhooks (probably more).
+
== Arrow (id 60) and Spectral Arrow (id 91) ==
  
 
{| class="wikitable"
 
{| class="wikitable"
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  | Int
 
  | Int
 
  | <code>64</code>
 
  | <code>64</code>
  | The entity ID of the thrower
+
  | The entity ID of the shooter + 1 (Subtract 1 to get the actual entity ID)
 
  |}
 
  |}
 +
 +
== Llama spit (id 68) ==
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 +
Velocity is always used even though the data field is always 0.
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 +
== Fireball (id 63), small fireball (id 64), dragon fireball (id 93), and wither skull (id 66) ==
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 +
The data field stores the ID of the shooting entity, or 0 if there was no shooting entity.  Velocity is used even if data is set to 0.
 +
 +
== Shulker bullet (id 67) ==
 +
 +
Velocity is always used even though the data field is always 0.
 +
 +
== Potion (id 73) ==
 +
 +
Velocity in the packet is always ignored.
 +
 +
== EXP bottle (id 75) ==
 +
 +
Velocity in the packet is always ignored.
  
 
[[Category:Protocol Details]]
 
[[Category:Protocol Details]]
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 15:04, 6 August 2019

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

In some cases, the data field has no meaning, but is only used to indicate presence of velocity. In others, it (and velocity) is always ignored.

Item (id 2)

The int value is ignored, but should be set to 1 to indicate that velocity is present.

Minecarts (id 10)

The int value itself specifies the minecart's functionality:

Value Minecart functionality
0 Empty (ride-able) minecart
1 Chest minecart
2 Furnace (powered) minecart
3 TNT minecart
4 Spawner minecart
5 Hopper minecart
6 Command Block minecart

Item Frame (id 71)

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

You have to set both Orientation and Yaw/Pitch accordingly, otherwise it will not work.

Velocity in the packet is always ignored.

Falling Block (id 70)

Field name Field type Example Notes
Block type Int 12 BlockID | (Metadata << 12)

Velocity in the packet is always ignored.

Fishing Float (id 90)

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

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?

Arrow (id 60) and Spectral Arrow (id 91)

Field name Field type Example Notes
Entity ID Int 64 The entity ID of the shooter + 1 (Subtract 1 to get the actual entity ID)

Llama spit (id 68)

Velocity is always used even though the data field is always 0.

Fireball (id 63), small fireball (id 64), dragon fireball (id 93), and wither skull (id 66)

The data field stores the ID of the shooting entity, or 0 if there was no shooting entity. Velocity is used even if data is set to 0.

Shulker bullet (id 67)

Velocity is always used even though the data field is always 0.

Potion (id 73)

Velocity in the packet is always ignored.

EXP bottle (id 75)

Velocity in the packet is always ignored.