# Fleet precision model attribution

## Sedan

The active sedan exterior is adapted from **BMW**, created by **Mike Pan** and repaired/exported by **Morgan McGuire**. The source archive identifies it as **CC0 / Public Domain**.

- Source collection: https://casual-effects.com/data/
- Original metadata: https://casual-effects.com/g3d/data10/research/model/bmw/info.js
- Original archive: https://casual-effects.com/g3d/data10/research/model/bmw/bmw.zip
- A copy of the source metadata is retained as `bmw-info.js`.

Modifications: orientation and scale corrected; badging, plates and colored brand marks removed; new green/pearl/graphite paint, separate glass, rubber and metal materials; engine-bay teaching assemblies fitted to the body. This is a two-door sports-sedan teaching exterior, not an exact four-door production CAD model. Source authors do not endorse this adaptation.

## Pickup and heavy truck

The new exterior geometry, wheel assemblies, cabin surfaces and trim were authored locally in Blender for this project, through `tools/fleet_precision_core.py` and `tools/build_fleet_precision.py`. These models do not incorporate downloaded pickup or truck assets. Existing teaching assemblies are retained and repositioned to fit.

## GT race car

The active GT exterior is adapted from **Car Concept** in the Khronos glTF Sample Assets collection.

- Model and textures: **Eric Chadwick / Darmstadt Graphics Group GmbH, © 2024**.
- License: [Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/).
- Source and full technical notes: https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/CarConcept
- Original concept geometry: **Unity Fan**, public domain / CC0, as credited in the source README.
- Original source: https://sketchfab.com/3d-models/free-concept-car-004-public-domain-cc0-4cba124633eb494eadc3bb0c4660ad7e

Modifications for this project: adjusted proportions and orientation; new green/pearl/graphite paint with twin racing stripes and side graphics; GT wing, uprights, splitter, dive planes, side skirts and diffuser; removed license-plate and tire-sidewall branding; optimized wiper geometry; integrated and fitted the existing teaching assemblies. These adaptations are not endorsed by the source authors. The unchanged upstream README is retained alongside the source model.

The original model includes Khronos and 3D Commerce logos (© 2015/2017 Khronos Group; logo terms in the upstream repository). Branded texture content is removed from the adapted active exterior. Tire tread normal and roughness maps, and interior surface detail, remain in use.

## Active deliverables

All four vehicles use `../vehicle_<sedan|race|pickup|truck>_precision.glb`, with corresponding editable `.blend` files. The paint graphics are authored procedurally and embedded as clean 2048 × 2048 color atlases in GLB exports. Runtime paint uses the same graphic layout, with system-dependent base colors. No Lopal / 龙蟠 lettering is added to vehicle bodies.

Rebuild scripts: `tools/build_race_precision.py`, `tools/build_fleet_precision.py`, then `tools/finish_fleet_precision.py` at the project root. Brand palette reference: https://www.lopal.cn/index . No new paid asset-generation task was submitted in this refinement pass.