nucleation 0.2.3

A high-performance Minecraft schematic parser and utility library

Nucleation for Python

Python bindings for Nucleation, a high-performance Minecraft schematic engine. Read, edit, build, simulate, and mesh .schematic, .litematic, .nbt, and .mcstructure files — at native speed.

The core is written in Rust and compiled to a CPython extension via PyO3 (abi3-py38), so a single wheel works on every CPython 3.8+ on your platform — no Rust toolchain required to install.

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Install

pip install nucleation

Pre-built wheels are published for:

• Linux x86_64 and aarch64
• macOS x86_64 (Intel) and arm64 (Apple Silicon)
• Windows x86_64

If your platform isn't covered, pip will fall back to the source distribution and build locally (requires a Rust toolchain).

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Quick start

from nucleation import Schematic, sign, text

# Three explicit constructors (legacy `Schematic("file.schem")` still works):
schem = Schematic.open("example.litematic")        # load from disk
fresh = Schematic.new("my_schematic")              # blank
templ = Schematic.from_template("ab\ncd")          # ASCII template

# Polished set_block: tuple coords, structured state and NBT, chainable.
schem.set_block((0, 0, 0), "minecraft:repeater",
                state={"delay": 4, "facing": "east"})
schem.set_block((0, 1, 0), "minecraft:oak_sign",
                state={"rotation": 8},
                nbt=sign([text("Hello", color="gold"), "world"]))

# Format inferred from extension.
schem.save("out.litematic")

Hot loops

For placing many blocks, prefer the batch and fast-path APIs:

# 30+ M placements/sec — one native call.
schem.set_blocks([(x, 0, 0) for x in range(1_000_000)], "minecraft:stone")

# 10+ M placements/sec — pre-resolve once, place by index.
stone = schem.prepare_block("minecraft:stone")
place = schem.place
for x, y, z in positions:
    place(x, y, z, stone)

Tile-entity helpers

from nucleation import Schematic, chest, sign, text, Item

schem = Schematic.new("loot_room")

schem.set_block((0, 0, 0), "minecraft:chest",
                state={"facing": "north"},
                nbt=chest([
                    Item("minecraft:diamond", count=64),
                    Item("minecraft:elytra"),
                ]))

schem.set_block((0, 1, 0), "minecraft:oak_sign",
                nbt=sign([text("Loot", color="gold"), "this way →"]))

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Documentation

Full reference, including simulation, meshing, and resource-pack rendering, lives in the main repository:

• Nucleation on GitHub
• Python API reference
• Schematic Builder guide

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Why Rust?

Nucleation's core is shared across Rust, WebAssembly/JS, Python, and C/PHP — one engine, one set of behaviour, one set of tests. The Python package you install is the same engine that powers the JS and Rust libraries; you get native throughput for free.

License

AGPL-3.0-only. See the main repository for details.