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Structure Lab v0.2.0 - Nebraska State Capitol

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@ewitulsk ewitulsk released this 07 Sep 06:16
· 3 commits to main since this release
v0.2.0
c49b31c

Structure Lab v0.2.0 — Nebraska State Capitol and large-build capture

A 185 × 130 × 185 vanilla-block Nebraska State Capitol, refined through three NBT → Minecraft screenshot → review iterations. The final model contains 253,376 non-air blocks, with 16 labeled views covering its exterior, gardens, public rooms, tower, and crown.

Downloads

  • nebraska_state_capitol.nbt — standalone Java 26.2 structure template.
  • nebraska_state_capitol.zip — vanilla datapack containing nebraska:state_capitol.
  • nebraska_state_capitol.views.json — camera definitions for Structure Lab.
  • nebraska_state_capitol_review.zip — all three iterations' Minecraft PNGs, contact sheets, manifests, and verification evidence.
  • structurelab-26.2-0.2.0.jar — updated NeoForge mod.
  • structurelab_mcp-0.2.0-py3-none-any.whl — updated local MCP server and authoring library.
  • SHA256SUMS.txt — artifact checksums.

The exported Capitol needs no mods. Install the datapack into a Java 26.2 world's datapacks folder, run /reload, load a clear 185 × 185 site, and place nebraska:state_capitol with /place template. Exact commands, scale notes, references, and review history.

Lab changes

  • Chunk-batched clearing and placement with progress reporting and recovery bounds.
  • Streaming gzip NBT authoring with deterministic output and typed block-entity support.
  • recapture_views creates a new screenshot set without replacing the structure.
  • Per-view render-distance requests, restored after capture.
  • Pause-on-focus-loss handling before placement; failed jobs stop pending placement work.
  • A 16-million-position volume budget, one million explicit records, and a 32-million-position cleanup union.

The final Capitol placement and 16-view capture completed in about 54 seconds on the test machine. A camera-only recapture completed in 38 seconds with zero placement units. Verification compared 184 live block positions against the exported template, confirmed an all-vanilla palette and identical datapack payload, and checked removal of the previous successful runtime revision. A separate unmodded Minecraft 26.2 client loaded the exported datapack successfully and produced an additional exterior screenshot. The Java build and six Python tests passed. Maximum-volume and 1024-angle workloads remain unqualified.

Install or update the tools

Requires Minecraft Java 26.2, NeoForge 26.2.0.77+ for that game version, Java 25, and Python 3.11+. Tested with NeoForge 26.2.0.79 and Python 3.13 on Windows. Stop Minecraft before replacing the JAR; keep only one enabled Structure Lab version. Upgrade the wheel in the Python environment used by your MCP client.

The model interprets the supplied tour and floor plan at block resolution. Office details, murals, mosaics, and sculpture are simplified rather than exact reproductions. The lab still requires a graphical singleplayer client; entity templates, multiple palettes, simulation validation, dedicated-server/RCON operation, disk quotas, and automatic failed-revision pruning are not implemented.

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