Panelled walls

Note: Size: 2 m long (X, a whole number of metres on the 1 m grid), 2.4 m tall and 0.11 m deep as panelling; 0.26 m deep at the book ledge and sconce. Origin: the snapping end, which is the left end seen from the front (x = 0), at the back face (z = 0, so the piece sits flush against a room wall), at floor level. The run spans x = 0 to x = length, the panels face +Z and the model rests on y = 0. End stiles are half width, so two pieces butt into one full stile and the panel rhythm continues across the joint. Skirting, chair rail and cornice run flush to both ends. Even grid metres carry a book ledge and odd ones a brass sconce, so chained pieces alternate. A 1 m piece carries a shorter ledge and a sconce. The back is a plain dark mahogany board meant to face a wall. The GLB has 924 triangles in 20 meshes. It is static and carries no animation clip. three-check's 1,214-triangle figure also counts the viewer's staging ground, which is not exported. Every material is named exactly after a kit palette colour. Which book colours appear depends on bookColours, so with the defaults soot black and mid grey are not in the GLB. Params are baked into the GLB at their defaults and only change the model when the scene is rebuilt in the viewer. bookColours (the kit's 'Book colours') sets the share of ledge books drawn from the bright kit colours (greens, parchment, warm white, brass, mid grey) instead of leather tones. At 0 every book is a leather brown or black; at 1 about 60 % are bright. The book layout comes from a fixed seed, so it is deterministic. length (1–4 m) rebuilds the run, panels sets 1–3 panel columns per metre, and dadoHeight moves the chair rail from 0.75 to 1.1 m. Both extremes passed three-check: the max (4 m, 3 panels, 1.1 m, colours 1) at 2,414 triangles with staging and the min (1 m, 1 panel, 0.75 m, colours 0) at 826. Ledge books are open boxes with no bottom or back face, which are never visible against the shelf and the wall. glb-lint: 0 errors and 6 heuristic warnings. They cover material count and exporter duplicates, non-indexed geometry (deliberate flat shading) and overlapping sibling boxes (panels nest inside the frame). The ledge shelf and brackets are reported as detached because they fix to the panelling, which sits outside their 'ledge' group. The last warning is the 2.4 m height against the direction's 1 m reference. The lint verdict reads UNVERIFIED only because no host requirements contract was supplied. plan-check rejects only the hyphenated library part ids, because its regex allows no hyphen; the same plan with the slug de-hyphenated passes. Fix round 1 removed z-fighting on the back between the backing board and the skirting and chair rail, and deepened the fields to forest green dark. Fix round 2 gave 1 m pieces a sconce, so every length carries every part.