Escalators

Note: Size at the defaults: 3.08 m wide (x), 14.6 m long (z) and 5.98 m tall to the top of the upper handrail newels. The floor-to-floor rise is 5.0 m (matching the kit's escalator well) at 30°, with 1.0 m steps on a 0.4 m pitch. The front faces +Z: both lower landings are at the front on a 0.235 m chrome landing plinth with a short grey ramp, and the upper landing plates sit flush at y = 5.0 m at the back. The origin is the bottom centre, resting on y = 0. A pier under each upper landing and a slim column mid-span carry the truss to the ground, so nothing floats when you place it without an upper floor. The GLB has 2,992 triangles in 98 meshes and one 3 s looping clip, 'scene-motion', made of rigid translation tracks only. Each step is its own named node (the up_step_NN and down_step_NN parts; 68 at the defaults). In each loop every step travels three pitches (1.2 m at 0.4 m/s) along the step path, up on the left escalator and down on the right, so the frame at 3 s matches 0 s. Steps stay level, flatten to two level steps at each comb, and enter and leave under the landing plates, so hidden steps exist inside both landing housings. Trusses, balustrades, landings and supports never move. Every material is named exactly after its kit palette colour; 8 of the 12 are used (warm white, white light, glass blue dark and dark wood are unused at the default). The exporter writes one material per mesh, so the same colour name repeats across materials: recolour by name. The glass is alpha-blended (BLEND, 45% opacity) and double-sided; some engines need it set to transparent on import. Params are baked into the GLB at their defaults and only change the geometry when the scene is rebuilt in the viewer. shopBrands (the kit's 'Shop brands') hangs flat brand-colour panels on the two outer truss sides: none at 0, two per side at 0.5 and four at 1 (pink, glass blue, dark wood, glass blue dark). units sets 1 to 3 side-by-side escalators that alternate up and down. Both extremes rendered cleanly: units 3, 6.0 m, 0.6 m steps and shopBrands 1 gives 5,570 viewer triangles; units 1, 3.5 m and shopBrands 0 also rendered. three-check flags missing planned ids at the minimum only because the down escalator and brand panels are absent there by design. glb-lint: 0 errors and 5 heuristic warnings: material count and duplicates (from the per-mesh export); sibling overlap (the deliberately embedded glass inside the handrail loop and the deck on the truss); 'detached' meshes (steps and upper-landing parts that touch other groups, not their siblings); and height against the direction's 1 m reference (5.98 m is the intended real size). plan-check passes except for its part-id regex, which rejects the hyphens in the slug-based ids this library requires. three-check accepts those ids, and all 16 planned ids survive the GLB reload.