Fuel game assets — V1

Status: ASSET_DRAFT_LOCAL_DONE / INTEGRATION_PENDING, 2026-10-09. Scope: GME-00 in the separate Games plan. These are genuine static 3D meshes, not PNGs placed inside a GLB container. Game implementation, sprite atlases, animation and device acceptance are planned.

Open preview.html in a WebGL browser to select, rotate, zoom and download each embedded GLB. The file is self-contained and works offline without a CDN or web service. Contact sheet is the static fallback. The preview uses simplified directional lighting; the GLBs carry PBR materials.

Contents and measured budgets

Eight models total 731,128 bytes (714.0 KiB) and 13,940 triangles:

• Common gasoline: 1,868 triangles / 97,932 bytes.
• Additive gasoline: 1,912 triangles / 99,928 bytes.
• Premium gasoline: 1,892 triangles / 99,092 bytes.
• Ethanol: 456 triangles / 27,768 bytes.
• Diesel S500: 2,336 triangles / 120,908 bytes.
• Diesel S10: 2,024 triangles / 105,592 bytes.
• CNG: 2,448 triangles / 126,472 bytes.
• LPG P13: 1,004 triangles / 53,436 bytes.

All fit the GME-00 art budget: 128 KiB and 3,000 triangles per model; pack under 1 MiB. These are measured art sizes, not a game/APK/memory benchmark. There are 2–3 primitives/materials per model, no external references, textures, fonts, skins, cameras, lights, extensions or animations. All positions, normals and indices are embedded in the GLB. Indexed flat normals preserve the low-poly style; material grouping avoids a draw call for every decorative part.

Provenance, categories and license

Original procedural modeling adapts the repository's existing fuel PNG artwork: rounded pump/plinth, right hose/nozzle, droplet, premium crown, ethanol leaf, CNG tank and LPG cylinder. It is a stylized 3D adaptation rather than a pixel-faithful trace. No image-generation model, purchased model, copied game character or new runtime dependency was used. MIT, with repository notices preserved. Names are generic fuel categories, not commercial fuel-brand assets.

Actual normalized PNGs under docs/assets/fuel-icons/transparent/ are the references, with SHA256 in manifest.json. In particular, the current CNG PNG is gold while its historical SVG has green paths; this pack follows the visible PNG, not that stale SVG ink. Existing sources are untouched. Category accents: common gasoline orange, additive gold, true premium ruby, ethanol green, S500 blue, S10 violet, CNG yellow-gold and LPG orange. White and charcoal are neutral. Silhouettes/badges and text labels supplement colors; color alone must never identify fuel in gameplay or accessible UI.

The legacy enum GASOLINE_PREMIUM means additive gasoline. The distinct premium asset binds to GASOLINE_PREMIUM_GRADE; manifest mappings preserve that existing domain meaning. Never derive enum names from the display filenames.

Import and rendering contract

• glTF 2.0 binary .glb, right-handed, Y up, front +Z, base Y=0, centred near X=0. Units are metres at artistic prop scale, not engineering dimensions or literal cylinder capacity. Bounds are recorded per file in the manifest.
• Static render props; shader uses category/ivory/charcoal PBR materials, opaque, metallic 0 and roughness 0.38/0.55. No transparency sorting or texture upload required. The browser viewer approximates the PBR appearance.
• Relief details and pump parts intentionally intersect; these are render assemblies, not certified single watertight solids or physical collision meshes. Games must define simple fair collision primitives separately.
• For 2.5D, render selected views into tightly cropped transparent atlases at actual target pixel size; add animation/LOD only as a separate selected task. Do not ship this documentation PNG/HTML or both unused GLB masters and atlases.
• For real 3D, first select a measured renderer/loader, verify import/materials and lifecycle on actual Android devices, and budget resident geometry/GPU memory and instance count. This desktop preview is not Android performance evidence.

Reproduction

From the repository root:

python3 scripts/assets/build-fuel-game-assets.py
python3 scripts/assets/build-fuel-game-assets.py --preview

The first command uses only the Python standard library for GLBs, manifest and HTML. The optional contact-sheet renderer uses existing workstation Pillow 12.2.0 / NumPy 2.4.6 (documentation-only tooling; nothing added to app/build dependencies). Generation is deterministic for the recorded Python 3.12.2 environment, including the source hashes. Re-run from a clean owned working tree and inspect changes instead of overwriting another task's art. The viewer template is here.

Local verification and limits

At the recorded dev baseline 4725ebcb65bc065f6c6db3c40929b38b7548880a:

• Generated every GLB and repeated generation to check byte-identical outputs.
• Checked glTF header/chunks/alignment, accessor/index ranges, finite positions, unit normals, stored bounds, materials, triangle/byte budgets, no external resources, exact category coverage and source/output SHA256 values.
• Independently loaded all eight models with existing workstation trimesh; verified triangle totals, winding consistency and positive oriented volumes. This is not a Khronos-validator or Blender/device certification claim.
• Inspected the contact sheet and actual browser WebGL rendering; selected categories and camera/rotation controls; no engine or service dependency.
• Checked Python/JavaScript syntax, local Markdown links, whitespace and scoped secret surface. Active app resources and code are unchanged; no aggregate Android/backend tests or release APK were run for this art/docs-only task.

The exact manifest pins the delivered artifacts. Current execution state is in PROGRESS; local art completion does not certify gameplay, fraud prevention, backend integration, national ranking or release.