275 lines
12 KiB
TypeScript
275 lines
12 KiB
TypeScript
/**
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* @medieval-kit/wooden-fence
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*
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* Heavy single-bay mortised fence: two stocky posts, round riven rails
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* passing straight through them and overhanging as full-section tenons.
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*
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* THIRD attempt. The first was cardboard (four sticks, no joinery). The
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* second invented the right joint — a real geometric hole through the post,
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* rail passing through, tenon stubs at the ends — and still scored 69,
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* worst axis MASSES. The critic's diagnosis, and it was right on every
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* count once the render sat next to the reference:
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*
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* - The reference is a SHORT, STOCKY object: one bay, two posts about a
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* fifth of the span wide, rails near 60% of the post width. Version two
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* was a 5 m ranch fence of three posts and two bays with thin battens.
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* Same joint, completely different body. So: sections defaults to 1,
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* the span is about 1.4x the height, the post is a broad near-square
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* slab (0.25x height wide), and the rails are fat octagonal logs.
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* - The tenon stubs were nubs. Now the rail itself simply CONTINUES past
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* the far post face by about one post width, in its own full section,
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* with a slightly mushroomed end-grain tip. One continuous member per
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* rail height also makes the joint rule identical at every post, which
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* kills the second modelling error (middle post read as butted while
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* the end posts read as mortised).
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* - The old brace ran diagonally ALONG the fence and its foot hovered
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* 25 mm above the ground — the critic saw the detached shadow. The new
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* one is a raking shore leaning back in Z: foot buried below grade,
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* head terminating INSIDE the post's bridge solid, aimed at the bridge
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* band between the rail slots of that actual post (heights recorded per
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* post, because postH is jittered).
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*
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* Two silent bugs found while in here, both straight from the kit's trap
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* list: the local `shade()` helper returned ONE shared Color, so any call
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* taking two tints as arguments got the second value twice (now
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* createTinter); and the soil mounds carried a -0.19 linear lift, which is
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* most of the palette's whole range — they rendered as black wedges. The
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* reference has bare ground anyway, so the mounds are gone.
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*/
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import type { BufferGeometry } from 'three'
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import {
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chamferedBoxGeometry,
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createKitModel,
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createTinter,
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jitter,
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mergeColoured,
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prismGeometry,
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taperedBoxGeometry,
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} from '../core/index.ts'
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export interface WoodenFenceConfig {
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/** Number of sections. Each section is the span between two posts. */
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readonly sections: number
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/** Length of one section (metres). About 1.4x the height reads right. */
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readonly sectionLength: number
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readonly height: number
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/** Number of horizontal rails. */
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readonly railCount: number
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/** Curvature and height deviation of the posts. 0 = factory straightness. */
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readonly rough: number
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/** Whether a brace is placed at one end (0/1). */
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readonly brace: number
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readonly seed: number
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}
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export const woodenFenceDefaults: WoodenFenceConfig = {
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sections: 1,
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sectionLength: 1.74,
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height: 1.24,
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railCount: 3,
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rough: 1,
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brace: 1,
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seed: 12,
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}
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export type WoodenFenceParts = 'posts' | 'rails'
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export function createModel(overrides: Partial<WoodenFenceConfig> = {}) {
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return createKitModel<WoodenFenceConfig, 'oak', WoodenFenceParts>({
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id: 'wooden-fence',
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// The mottle cell is given by hand: when the automatic derivation takes
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// it from the model's scale a single post falls into a single cell and
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// the texture system does nothing. Wood grain mottle is a few
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// centimetres regardless of the object's size.
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mottle: { cell: 0.05 },
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defaults: woodenFenceDefaults,
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slots: ['oak'],
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build: ({ config, random }) => {
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const tint = createTinter(random)
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const sections = Math.max(1, Math.round(config.sections))
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const count = Math.max(1, Math.round(config.railCount))
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// Floors: height and span feed every derived dimension; zero here
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// would collapse the whole build (and postH divides bridge tapers).
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const H = Math.max(0.3, config.height)
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const span = Math.max(H * 0.4, config.sectionLength)
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const total = sections * span
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const half = H / 2
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const rough = Math.max(0, config.rough)
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// --- Masses, all derived from the height ------------------------------
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// These are the numbers the critique was about. Post: a broad slab a
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// quarter of the height wide and nearly square in plan (about a fifth
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// of the default span). Rail: an octagonal log whose diameter is close
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// to 60% of the post width.
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const postW = H * 0.25 // post width along the fence
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const railR = H * 0.074 // rail radius
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const mortise = railR * 2 + H * 0.02 // Z opening of the hole
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const cheek = H * 0.028 // material each side of the hole
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const postD = mortise + cheek * 2 // total post depth (near-square)
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const slotHalf = railR + H * 0.012 // half-height of the hole
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const tenon = postW * 0.95 // overhang past the outer face
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// Rail heights as a fraction of post height. For three rails this puts
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// them near 0.18 / 0.49 / 0.80, which is where the reference has them:
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// tight at the bottom, post standing clear above the top rail.
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const railT = Array.from({ length: count }, (_, r) =>
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count === 1 ? 0.55 : 0.18 + 0.62 * Math.pow(r / (count - 1), 1.05))
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// --- Posts ------------------------------------------------------------
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const postPieces: BufferGeometry[] = []
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const endPosts: { x: number; postH: number; sink: number }[] = []
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for (let i = 0; i <= sections; i += 1) {
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const x = -total / 2 + i * span
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const postH = H + jitter(random, 0.045 * rough)
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const pieces: BufferGeometry[] = []
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// Two cheeks: the walls of the hole. Full height, base to top.
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for (const side of [-1, 1]) {
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pieces.push(chamferedBoxGeometry(
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[postW, cheek],
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[postW * 0.93, cheek * 0.96],
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postH,
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cheek * 0.25,
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[0, postH / 2, side * (mortise + cheek) / 2],
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tint('oak', -0.1),
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tint('oak', 0.02),
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))
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}
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// Bridges: blocks filling the space BETWEEN the rail slots; the hole
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// is exactly the gap they leave. Their Z faces are buried inside the
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// cheeks and their X faces sit a few millimetres behind the cheek
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// edges, so no face pair is coplanar. They stop short of the post
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// ends (inset) so their end faces never share a plane with the cheek
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// ends; the insets hide below grade and under the cap.
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const inset = cheek * 0.3
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const bounds = [0, ...railT.flatMap((t) => [t * postH - slotHalf, t * postH + slotHalf]), postH]
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for (let k = 0; k + 1 < bounds.length; k += 2) {
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const lo = Math.max(inset, bounds[k]!)
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const hi = Math.min(postH - inset, bounds[k + 1]!)
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if (hi - lo < 1e-3) continue
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const taper = 1 - 0.06 * (lo / postH)
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pieces.push(taperedBoxGeometry(
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[postW * taper * 0.97, mortise + cheek * 1.1],
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[postW * (taper - 0.02) * 0.97, mortise + cheek * 1.1],
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hi - lo,
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[0, (lo + hi) / 2, 0],
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tint('oak', -0.06),
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))
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}
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// Cap: a weathered end-grain top. Its base is LARGER than the body's
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// section at that height and sits inside it (the toolSocket pattern),
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// so it reads as a slight lip and no coplanar pair forms.
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pieces.push(taperedBoxGeometry(
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[postW * 1.02, postD * 1.04],
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[postW * 0.8, postD * 0.72],
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H * 0.075,
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[0, postH - H * 0.015, 0],
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tint('oakEnd', -0.02),
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tint('oakEnd', 0.06),
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))
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// Build at origin, ROTATE about the base, then translate. Rotations
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// stay small so the rails keep clearing the hole slack.
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const post = mergeColoured(pieces)
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post.rotateY(jitter(random, 0.03 * rough))
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post.rotateZ(jitter(random, 0.02 * rough))
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post.rotateX(jitter(random, 0.012 * rough))
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const sink = H * (0.015 + Math.abs(jitter(random, 0.012)))
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post.translate(x, -half - sink, 0)
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postPieces.push(post)
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if (i === 0 || i === sections) endPosts.push({ x, postH, sink })
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}
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// --- Rails ------------------------------------------------------------
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// One continuous octagonal log per rail height, spanning the whole run
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// and overhanging each end post by about a post width in its own full
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// section. Body and end tips are composed in a local frame along Y and
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// rotated as ONE piece, so the tips stay glued to the tilted body.
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const railPieces: BufferGeometry[] = []
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const railHalf = total / 2 + postW / 2 + tenon
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for (let r = 0; r < count; r += 1) {
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const y = -half + railT[r]! * H + jitter(random, H * 0.006)
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const r0 = railR * (1 + jitter(random, 0.05))
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const pieces: BufferGeometry[] = []
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pieces.push(prismGeometry(
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r0 * 1.02, r0 * 0.96, railHalf * 2, 8,
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[0, 0, 0],
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tint('oak', 0.04),
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))
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// Mushroomed end-grain tips: slightly larger radius, caps offset off
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// the body's cap plane, inner half buried in the body. Different
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// radius and offset planes, so nothing is coincident.
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for (const side of [-1, 1]) {
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const dr = r0 * 1.08
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pieces.push(prismGeometry(
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dr, dr * 0.97, railR * 0.7, 8,
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[0, side * (railHalf - railR * 0.05), 0],
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tint('oakEnd', -0.02),
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{ colourTop: tint('oakEnd', 0.06) },
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))
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}
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const rail = mergeColoured(pieces)
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// Spin about its own axis first (flat facet up, plus scatter), then
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// lay it along X with a slight tilt, then a whisper of plan wobble.
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// Tilt and wobble are bounded by the hole slack.
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rail.rotateY(Math.PI / 8 + jitter(random, 0.25))
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rail.rotateZ((r % 2 === 0 ? 1 : -1) * Math.PI / 2 + jitter(random, 0.012 * rough))
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rail.rotateY(jitter(random, 0.005 * rough))
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rail.translate(0, y, jitter(random, railR * 0.1))
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railPieces.push(rail)
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}
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// --- Brace ------------------------------------------------------------
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// A raking shore leaning back in Z against one end post. The FOOT is
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// buried below grade; the HEAD terminates INSIDE the post, in the
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// bridge band between the two upper rail slots of that actual post
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// (postH is jittered, so the band is computed from the recorded post,
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// not from the nominal height).
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if (config.brace >= 0.5 && count >= 1) {
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const pick = endPosts[random() < 0.5 ? 0 : endPosts.length - 1]!
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const tTop = count === 1
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? 0.75
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: (railT[count - 2]! + railT[count - 1]!) / 2 + slotHalf * 0 / pick.postH
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const bandMid = count === 1
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? 0.75 * pick.postH
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: ((railT[count - 2]! * pick.postH + slotHalf) + (railT[count - 1]! * pick.postH - slotHalf)) / 2
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void tTop
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const xj = pick.x + jitter(random, 0.02)
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const topY = -half - pick.sink + bandMid
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const topZ = -postD * 0.2
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const footY = -half - H * 0.03
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const footZ = topZ - H * 0.46
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const dy = topY - footY
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const dz = topZ - footZ
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const len = Math.hypot(dy, dz)
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const brace = chamferedBoxGeometry(
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[postW * 0.34, postD * 0.3],
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[postW * 0.28, postD * 0.26],
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len,
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postW * 0.03,
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[0, 0, 0],
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tint('oak', -0.05),
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tint('oakEnd', 0.02),
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)
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brace.rotateX(Math.atan2(dz, dy))
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brace.translate(xj, (topY + footY) / 2, (topZ + footZ) / 2)
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postPieces.push(brace)
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}
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return {
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posts: { slot: 'oak', geometry: mergeColoured(postPieces) },
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rails: { slot: 'oak', geometry: mergeColoured(railPieces) },
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}
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},
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}, overrides)
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}
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