Object Data

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Object Data

In the "Spawn Object/Vehicle" 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 15w31a, protocol 49 this data is always required):

Field Name Field Type Example Notes
Speed X Short 0 The speed of the object, same units as Entity Velocity
Speed Y Short 0 The speed of the object, same units as Entity Velocity
Speed Z Short 0 The speed of the object, same units as Entity Velocity

Meaning of int field

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)

Field Name Field Type Example Notes
Orientation int 3 0-3: South, West, North, East

Falling Block (id 70)

Field Name Field Type Example Notes
Block Type int 12 BlockID | (Metadata << 0x10)

Splash Potions (id 73)

Field Name Field Type Example Notes
Entity ID int 64 Potion data value

For more information on potion data values, see [1].

Fishing Float (id 90)

Field Name Field Type Example Notes
Owner int The entity ID of the owner


Projectiles (Any projectile)

This includes ghast fireballs, arrows, and fishhooks (probably more).

Field Name Field Type Example Notes
Entity ID int 64 The entity ID of the thrower