Tractor with trailer

Note: Size: 7.0 m long on the 1 m grid (6.94 m of model between z = 0.035 and z = 6.97, so chained pieces leave a small gap), 1.88 m wide across the tractor's rear fenders (the trailer is 1.63 m wide) and 2.14 m tall to the top of the roll bar. The tractor has 1.2 m rear and 0.8 m front tyres on a 1.9 m wheelbase; the trailer deck is 2.7 x 1.56 m at 1.0 m high. Snapping: the origin is the snapping end, at the tail of the trailer (z = 0, ground level, centred in width), and the rig runs forward along +Z to its front weight just short of z = 7, where the next piece's origin goes. On purpose, this breaks the library's usual bottom-centre origin, because the brief asks for an end origin on modular pieces. The front (tractor grille) faces +Z and every tyre rests on y = 0. The GLB has 3,848 triangles in 49 meshes (merged per part and colour) with flat normals (non-indexed). Every material is named exactly after a kit palette colour, and all 12 are used. The exporter writes one material per mesh, so names repeat; recolour by name. The baked clip scene-motion (6 s, seamless) moves only parts on their own pivots. The rear wheels roll 2 turns and the front and trailer wheels 3, which covers the same ground. The front wheels sit in kingpin nodes that swivel about vertical axes through the wheel centres. The steering wheel turns on its tilted column in step with them, and the exhaust rain cap pops open 6 times on its rear-edge hinge. The tractor body and trailer never move. The tyres are faceted (16 and 12 sides), so while they roll the lowest point dips to about -0.009 m. The exported static node pose is the t = 2 s frame, because three-check exports after its determinism seek. season (the kit's 'Season', 0 = late summer, 1 = late autumn) ripens the apple load from gold and light-red early apples to deep red late ones. load sets the heap height and the number of loose apples (26 to 60). sideHeight sets the trailer's three-plank side height (0.3 to 0.7 m). steerAngle sets the steering amplitude of the loop. Params are baked into the GLB at their defaults and only change the model when the scene is rebuilt in the viewer. Only the defaults were rendered and checked. glb-lint: 0 errors and 7 heuristic warnings. Two come from the per-mesh materials (material count and duplicates). One flags non-indexed geometry, which is deliberate flat shading. One flags sibling overlaps where boxes nest by design (stripe on bonnet, liner inside planks, slats in grille). One flags 'detached' parts because each part's meshes sit in their own group, though all of them rest on the tractor or trailer. One flags the 2.36 m height against a generic 1 m reference. One reports a 0.22 m dip below the ground, which comes from the lint's box around the rotated wheel bounds; measured against the actual vertices, the lowest point is -0.009 m. The verdict reads UNVERIFIED only because no 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 slug de-hyphenated it passes. three-check accepts the real ids, and all 25 survive the GLB reload. Fix round 1: the viewer's stage disc was centred under the snapping end, so it was slid under the rig (staging only). A dark liner was added so the plank gaps stop showing the red heap, and a dangling prop stand was removed. Fix round 2: the hero, top, front and back framing was loosened, because the front wheel and both ends were cropped.