Skip to content

Prefab format

<name>.prefab.json files are used to save and export player made structures/prefabs, allowing players to then paste the prefab in to another world or another universe within the same world.

JSON format

  • : Root object.
    • version: The format version used at time of saving.
    • blockIdVersion: The block Id version used at time of saving.
    • anchorX: The X coordinate anchor or origin point relative to the prefabs area. 0 being the center of the prefab area.
    • anchorY: The Y coordinate anchor or origin point relative to the prefabs area. 0 being the bottom layer of the prefab area.
    • anchorZ: The Z coordinate anchor or origin point relative to the prefabs area. 0 being the center of the prefab area.
    • blocks: The list of all non-Empty blocks in the prefab. Saved from the bottom North-West corner to the top South-East corner.
      • : A block entry.
        • x: The prefab relative X position of this block.
        • y: The prefab relative Y position of this block.
        • z: The prefab relative Z position of this block.
        • name: The block id.
        • components: The component data for this block. May not exist.
        • support: The support distance level of this block. May not exist.
        • filler: The filler value, may be a bit field (Unconfirmed). May not exist.
        • rotation: The rotation value of this block. May not exist.
    • fluids: The list of all fluids in the prefab. Saved from the bottom North-West corner to the top South-East corner.
      • : A fluid entry.
        • x: The prefab relative X position of this fluid.
        • y: The prefab relative Y position of this fluid.
        • z: The prefab relative Z position of this fluid.
        • name: The fluid id.
        • level: The fluids level.

History

Early Access
2026.01.13-dcad8778f The prefab format is introduced.