Treadmill belt

Note: Size at the defaults: 0.86 m wide (across the handrail grips) × 1.46 m tall (top of the console) × 1.98 m long. The tread is 0.49 m wide, its top is 0.22 m off the floor, and the rollers are 1.45 m apart. The origin is at the bottom centre on y = 0. The front (+Z) is the step-on end; the console is at the back (-Z), so a runner faces -Z. The GLB has 1,564 triangles in 76 meshes. Animation clip 'scene-motion' is 3.89 s, baked at 60 fps. In each loop the belt runs exactly 2 laps, so every one of the 54 slat nodes ends where it started and nothing jumps at the loop point. The tread top moves toward +Z. Each roller pivots on its axle and makes 19 whole turns per loop, about 1% faster than pure rolling, so the loop closes. The frame, deck, hood, uprights, console and handrails never move. Every material is named exactly after a kit palette colour; 6 of the 12 are used (white, the four woods and court blue light are not used at the defaults). The exporter writes one material per mesh, so the same colour name appears on several materials: recolour by name. sportOnCourt (the kit's 'Sport on court') sets the accent on the hood stripe, the console program bars and the grip end bands in three steps: court blue light below 0.34, energy orange up to 0.67, wood light (the sprung-floor colour) above. It also morphs the program bar graph smoothly, from a flat walking profile at 0 to a spiky interval profile at 1. beltLength (1.3–1.7 m) stretches the deck, rails and belt. beltSpeed (2–12 km/h) sets the belt pace; the loop length follows it and runs 1–4 whole laps, so the clip stays between 3 and 6.7 s. 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. Normals are baked flat (non-indexed geometry). glb-lint: 0 errors and 5 heuristic or direction warnings. Two come from the per-mesh materials (material count over the direction default, duplicate names). One flags non-indexed primitives, which is deliberate flat shading. One flags overlaps where the axles pass through the drums, hubs and rails by design. One flags the slats and deck board as 'detached' because the slats ride in their own nodes and the deck edges are seated in the rails, which belong to another group. Its 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 ids substituted it passes. three-check accepts the real ids, and all planned ids survive the GLB reload.