structura-core

Reusable Minecraft Java 1.21.1 structure-processing core. It owns:

validated Java Structure NBT I/O;
legacy schematic conversion and numeric analysis;
NumPy/SciPy voxel geometry primitives (connected components, closing).

Structure input accepts gzip-compressed and raw NBT, including files with multiple palettes; output is gzip-compressed and reproducible byte for byte.

The library targets Minecraft Java 1.21.1 by default. Version constants live in structura_core.version; callers can still pass an explicit Amulet translation target to the legacy converter.

pip install -e '.[legacy]'
structura-analyze path/to/structure.nbt --json

The legacy extra is only needed for .schematic conversion and Sponge .schem export. Normal Structure NBT processing stays independent of amulet-core.

Legacy conversion keeps paintings and item frames by default, which is safe for generated structures. Preview tools can call convert(..., preserve_all_entities=True) to retain mobs, armor stands and loose items as well, including their exact fractional positions and NBT payloads.

Generated additions may replace explicit air, but never overwrite source solid blocks. Every saved position is bounds-checked.

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