# BMW M3 Competition Touring [G81] body study

Source artist: [Black Snow](https://sketchfab.com/BlackSnow02).
Original source page: https://sketchfab.com/3d-models/bmw-m3-competition-tourning-g81-e2a4d608b2034e639c7eb6a2ef8dbfa1
License: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
Pinned licensed mirror: https://raw.githubusercontent.com/pedrosoandre/carros/0a56de377f02f2574d781f6920fed08d6423ec2f/assets/bmw-m3-competition.glb
Pinned source SHA256: ea47d5f95a209f1027fdb13493af2aa9c5e4949d0e025f52efada9e599a60abc

The pinned mirror is a preprocessed glTF asset, not a claim of byte identity with the artist's downloadable original. Artist, title, source and license are embedded in that file and were checked against the current source API on October 21, 2026 (Asia/Shanghai).

WrapPrism web-joined-v1 adaptation: official glTF Transform 4.5.1 flattens static transforms and joins compatible material primitives (462 scene primitive instances to 80). The rendered geometry retains 266,008 triangles with equal per-material counts and world bounds error below 0.001%. No geometry simplification or material palette merge. Textures use WebP quality 88, maximum 1024px; Meshopt medium uses 16-bit positions, 12-bit normals and 16-bit UVs where valid. Out-of-range source UVs remain unquantized. No animation or skin is removed; the source has none. Rebuild and checks: docs/wrap/expansion-next/batch-2/build-m3-delivery.mjs and m3-delivery.json.

Runtime changes only the named m3g81law paint surface and uses approximate box-projected artwork. Roof, glass, lights, wheels and trim keep their source materials. Viewer length is presentation normalization, not measured installation geometry. No exact factory model year, cutting pattern, film quantity or manufacturer endorsement is claimed.