Tow truck

Note: Size: a medium-duty wrecker 5.99 m long from the front bumper guards to the rear tow bar, 2.48 m wide across the mirrors and 2.74 m tall to the top of the beacon (cab roof at 2.18 m). The boom tip sits at about 2.7 m at rest and reaches about 2.9 m at the top of its swing. The tyres are 0.92 m across, on a 3.2 m wheelbase with dual tyres at the rear. The origin is at the bottom centre of the footprint, and the tyres rest on y = 0. The front (grille) faces +Z. The model root carries a 0.155 m z offset so the footprint is centred. The GLB has 2,428 triangles in 57 meshes, merged per part and per colour. Every material is named exactly after a kit palette colour; 11 of the 12 are used (desert tan is not). The exporter writes one material per mesh, so the same colour name appears on several materials: recolour by name. The baked clip scene-motion (6 s, seamless) moves only parts on their own pivots. All four wheel sets roll 1 whole turn on their axles. The front wheels sit in kingpin nodes that swivel ±0.12 rad about vertical axes through the wheel centres. The boom luffs about its deck hinge axle. The ram barrel swivels on its foot pin while its rod slides along it, so the rod end stays on the boom. The hook hangs plumb from the sheave axle and swings twice. The beacon makes 6 turns. The body never moves. The windows are opaque chrome dark panels with no cab interior. Params are baked into the GLB at their defaults and only change the model when the scene is rebuilt in the viewer. era (the kit's 'Era') runs from a rounded 1950s front (crowned fenders and roof, a tall narrow grille with vertical slots, headlamp pods on the fenders) to a squarer 1970s front (flat fenders, a wide low grille with horizontal slots, lamps set into the fender faces). boomLength sets the boom from 1.9 to 2.7 m. boomSwing sets the amplitude of the boom lift in the loop (0 holds it still). Only the default params were rendered and checked; the extremes were not captured. glb-lint: 0 errors and 7 heuristic warnings (non-indexed flat-shaded geometry, per-mesh duplicate materials, deliberately nested trim overlaps, parts flagged 'detached' because each sits in its own group, height against a generic 1 m reference, and a 0.18 m ground dip). The ground dip comes from the lint's box around the rotated tyre bounds in the exported mid-roll pose; measured against the actual vertices, the lowest point is -0.005 m (a tyre facet mid-roll). The verdict reads UNVERIFIED only because no host requirements contract was supplied. plan-check passes except for its part-id regex, which rejects the hyphens in the slug-based ids this library requires; with the ids substituted it passes. three-check accepts the real ids, and all 26 survive the GLB reload.