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A desktop editor for the modular hulls of the Protectorate liners in Nebulous: Fleet Command .fleet files. Open a fleet, choose the bow / core / stern pieces, the dressing variant of every attachment point and any superstructure, preview the assembled hull in an orthographic side view and an orbitable 3D view, then save the file back — untouched everywhere you did not edit it.

Every other hull type is listed read-only, so nothing in a fleet is ever lost.

• Windows 10 or 11 with an OpenGL 3.3 capable driver
• Qt 6.8.0 (MinGW 13.1 kit), CMake 3.21 or newer, Ninja

CMakePresets.json expects Qt in C:/Qt/6.8.0/mingw_64 and the toolchain in C:/Qt/Tools/mingw1310_64. Point CMAKE_PREFIX_PATH, CMAKE_CXX_COMPILER and CMAKE_RC_COMPILER at your own installation to build somewhere else.

./scripts/build.ps1            # configure, build, run the tests
./scripts/build.ps1 -Deploy    # additionally produce a runnable tree in ./dist
./scripts/package.ps1          # pack ./dist into dist/NLHC-<version>-win64.zip

-Deploy rebuilds dist from scratch instead of installing over the previous tree, so an archive never carries files the current sources no longer produce. package.ps1 stages that tree under a single NLHC-<version>-win64/ folder, launches the staged copy once to prove the dependency set is complete, and writes the archive plus a .sha256 next to it.

The plain CMake flow works as well:

cmake --preset mingw-release
cmake --build --preset mingw-release
ctest --preset mingw-release

Artifacts: NLHC.exe (application), NLHCCore.dll (fleet, asset and assembly library) and NLHCRender, a static rendering library shared with the tests.

The archive also carries Liner Hull Customizer.exe at its root: a launcher that starts bin/NLHC.exe from wherever the folder was unpacked.

1. File → Open fleet… and pick a .fleet file. Every ship is listed; the supported hull types become editable, the rest stay read-only.
2. Pick the bow / core / stern pieces under Primary structure. Each piece exposes its dressing points; choose a variant per point ((empty) is offered where the game allows an empty slot).
3. Edit the Superstructure entries (piece / segment / snap point). Combinations that would break the hull are refused and explained in Diagnostics.
4. Base color and Trim color default to #1b405b and #f26522. They are preview settings and are not written to the fleet; Hull tint is a real fleet field and is written back.
5. File → Save writes the fleet in place and keeps a .bak copy. Unknown XML is preserved verbatim, so a file only changes where you changed it.

The viewport is split: the left half is an orthographic side view, the right half is an orbit view (drag with the left button, zoom with the wheel, pan with the middle or right button, double-click to reset).

Command line:

NLHC.exe --open <fleet> [--ship <index>] [--screenshot <png>]   # render without the UI
NLHC.exe --render-demo <png>                                     # render the synthetic demo hull

MIT — see LICENSE.