280 lines
12 KiB
TypeScript
280 lines
12 KiB
TypeScript
/**
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* @medieval-kit/hay-bale
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*
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* A bound bundle of straw, standing on its flat end.
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*
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* A warning is in order: the rectangular block that comes to mind today when
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* you say "bale" is machine work and belongs to the 19th century. In the Middle
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* Ages straw was either heaped loose or bound by hand into a bundle. This model
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* is that bundle, stood upright the way the reference shows it.
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*
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* The FOURTH attempt. The dead ends so far:
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*
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* - The first was slice after slice of boxes and rendered as A PALE WOODEN
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* CHEST. Rectangular section + flat faces = joinery. A bound bundle's
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* section is round, because the cord that pulls it rounds it.
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* - The second fixed the section but laid the cylinder DOWN, near 3:1 long,
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* with flat grey strips for the ties. The critic read it as a bedroll with
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* steel strapping.
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* - The third stood the drum up and swept real arcBar tori for the ropes,
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* but scored 61 as "a barrel or a wheel of cheese", and every reason
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* traced to three choices:
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* 1. colourTop was strawPale and latheGeometry lerps wall colour from
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* base to top ACROSS ALL LEVELS, so the whole upper wall drifted to
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* pale butter and the top disc went nearly white. Reference wall is
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* mid-brown (102, 75, 46). Both tints are now plain `straw`, the
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* gradient is a few percent, and an extra mottle pass breaks the
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* flatness (reference luminance sd 37 vs our 16).
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* 2. the rope tori barely cleared the wall (outer face ~6 mm proud
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* against 12 mm of bump), so with the cinch groove they rendered as
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* RECESSED dark bands = barrel hoops. The cord centre now sits ON the
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* wall radius, outer face ~19 mm proud of the worst bump, in light
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* hemp (cloth) so the cords read raised, not cut in.
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* 3. per-level radius jitter at 1% stepped the silhouette like stacked
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* drums. Now 0.5%, and the profile is one smooth barrel: max
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* diameter in the upper third, slight taper to the base, a real
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* shoulder easing to a top disc of 0.80 diameter, and a low crown
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* instead of a dead-flat full-width cap meeting the wall at 90
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* degrees (that hard rim is what said "tub").
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* - Modelling errors called out on the third, all placement: base wisps
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* drooping through the floor (droop is now clamped so the tip stays above
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* y=0), wisps lying flat on or half-sunk in the top disc (top-disc wisps
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* now tilt at least 0.5 rad and root under the crown surface), and wisps
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* with a visible gap to the wall (roots now sit 7-8% of R inside the
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* surface, 28% of the length buried).
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*
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* The `wisps` config field now means BUNDLES of stray stalks, not single
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* stalks: each unit spawns ~2.2 thinner straws so the silhouette breaks
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* continuously at the top rim and the base ring, which is where the reference
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* breaks. The field's default is unchanged.
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*/
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import type { BufferGeometry } from 'three'
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import {
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arcBarGeometry,
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boxGeometry,
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createKitModel,
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createTinter,
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jitter,
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latheGeometry,
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mergeColoured,
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mottleGeometry,
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roughenGeometry,
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type Level,
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} from '../core/index.ts'
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export interface HayBaleConfig {
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/** Footprint diameter along X (metres). */
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readonly length: number
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/** Height (metres). The bale stands on its flat end. */
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readonly height: number
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/** Footprint diameter along Z (metres). */
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readonly depth: number
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/** How many rope ties around the wall. */
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readonly ropeCount: number
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/** Number of loose stalks sticking out of the surface. */
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readonly wisps: number
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/** Surface irregularity. 0 = smooth body. */
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readonly rough: number
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readonly seed: number
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}
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export const hayBaleDefaults: HayBaleConfig = {
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length: 1.0,
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height: 0.74,
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depth: 1.0,
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ropeCount: 3,
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wisps: 40,
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rough: 1,
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seed: 47,
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}
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export type HayBaleParts = 'bale' | 'wisps' | 'ropes'
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export function createModel(overrides: Partial<HayBaleConfig> = {}) {
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return createKitModel<HayBaleConfig, 'straw' | 'cloth', HayBaleParts>({
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id: 'hay-bale',
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defaults: hayBaleDefaults,
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slots: ['straw', 'cloth'],
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build: ({ config, random }) => {
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const tint = createTinter(random)
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const ropes = Math.max(0, Math.round(config.ropeCount))
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// Floored: a zero patch on any of these would put NaN into every vertex
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// via the squash division, and the occlusion bake spreads one NaN to the
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// whole model.
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const H = Math.max(0.1, config.height)
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const R = Math.max(0.05, config.length / 2)
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const squashZ = Math.max(0.1, config.depth) / (R * 2)
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// Ropes at 22 / 50 / 78 percent of the height for the default three,
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// which is where the reference has them: the outer pair sit nearer the
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// rims than an even 25/75 split.
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const ropeYs = ropes === 1
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? [H * 0.5]
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: Array.from({ length: ropes }, (_, i) => H * (0.22 + (0.56 * i) / Math.max(1, ropes - 1)))
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// The wall pinches a little where each rope bites. The rope itself
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// stands proud; the pinch only has to hint.
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const cinch = (y: number): number => {
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let tightest = 1
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for (const ry of ropeYs) {
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const distance = Math.abs(y - ry) / (H * 0.12)
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if (distance < 1) tightest = Math.min(tightest, 1 - 0.02 * (1 - distance * distance))
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}
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return tightest
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}
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// One smooth barrel: slight taper to the base, maximum diameter at 68%
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// of the height, and a shoulder over the last 12% easing in to a top
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// disc of 0.80 of the diameter. No steps.
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const profile = (t: number): number => {
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const swell = 1 - 0.05 * Math.pow(Math.abs(t - 0.68) / 0.68, 1.7)
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const s = t <= 0.88 ? 0 : (t - 0.88) / 0.12
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return swell * (1 - 0.2 * s * s)
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}
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const wallR = (y: number): number => R * profile(Math.min(1, Math.max(0, y / H))) * cinch(y)
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// --- Body -----------------------------------------------------------
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const rings = 16
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const levels: Level[] = Array.from({ length: rings }, (_, i) => {
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const t = i / (rings - 1)
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const y = H * t
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// 0.5% jitter. At 1% every level stood out as its own ridge and the
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// silhouette stepped like stacked drums.
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return { y, radius: wallR(y) * (1 + jitter(random, 0.005)) }
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})
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// A low crown instead of a flat cap: the top disc rises to a blunt apex
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// ~2.5 cm above the rim, closed by the zero-radius level (latheGeometry
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// collapses that edge to a point, so there is no separate flat cap).
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const rimR = levels[rings - 1]!.radius
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levels.push({ y: H + R * 0.03, radius: rimR * 0.62 })
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levels.push({ y: H + R * 0.05, radius: 0 })
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// Both tints are STRAW. The third attempt used strawPale as colourTop
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// and the lathe's base-to-top lerp bleached the whole upper wall; the
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// reference wall is mid-brown and its top only a shade lighter.
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const body = latheGeometry(levels, 18, [0, 0, 0], tint('straw', -0.06, 0.8), {
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colourTop: tint('straw', 0.04, 0.8),
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})
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body.scale(1, 1, squashZ)
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// 6 mm of grain: the rope has to clear every bump and reach below every
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// hollow, and the ring maths below assumes this amplitude.
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const grain = R * 0.012 * config.rough
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roughenGeometry(body, grain, { salt: 11, scaleY: 0.45 })
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body.translate(0, -grain * 0.45, 0)
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// Straw texture on top of the kit's own mottle pass: the reference wall
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// has twice our luminance spread, and facet steps alone do not carry it.
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// Measured after the first render of THIS version: wall luminance sd was
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// 16 against the reference's 40, so the amount went from 0.22 to 0.34.
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mottleGeometry(body, 0.34, { cell: 0.05, salt: 5, hue: 0.6 })
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// Crown surface height at a given radius, for seating things ON the top.
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const crownY = (r: number): number => {
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if (r >= rimR) return H
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if (r >= rimR * 0.62) return H + R * 0.03 * ((rimR - r) / (rimR * 0.38))
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return H + R * 0.03 + R * 0.02 * (1 - r / (rimR * 0.62))
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}
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// --- Ropes -----------------------------------------------------------
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// Raised cords, not grooves. Cord is ~3% of the diameter across; its
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// centre sits ON the wall radius, so the outer face stands ~19 mm proud
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// of even the highest bump (jitter 0.5% + grain 6 mm ~ 9 mm) and the
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// inner face is buried below the deepest hollow. Light hemp against the
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// darkened body: the cord must read as a rope lying ON the straw.
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const ropePieces: BufferGeometry[] = []
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const cord = R * 0.064
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const hempBase = tint('cloth', -0.03, 0.5)
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for (const y of ropeYs) {
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const centreRadius = wallR(y) + cord * 0.1
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const ring = arcBarGeometry(centreRadius, cord, 0, Math.PI * 2, 20,
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[0, 0, 0], hempBase.clone())
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ring.rotateX(Math.PI / 2)
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ring.scale(1, 1, squashZ)
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ring.translate(0, y, 0)
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ropePieces.push(ring)
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}
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// The reference top face carries the coil of the binding as circles of
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// cord lying on the crown, half-sunk. Thin, and the SAME light hemp as
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// the wall cords: a first pass tinted them darker and they rendered as
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// charcoal hoops on a lid, which said "wheel", not "binding". Occlusion
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// already shades their contact line; the cord itself must stay cord
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// coloured.
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for (const rr of [rimR * 0.36, rimR * 0.64]) {
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const topCord = R * 0.028
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const ring = arcBarGeometry(rr, topCord, 0, Math.PI * 2, 16,
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[0, 0, 0], tint('cloth', -0.02, 0.5))
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ring.rotateX(Math.PI / 2)
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ring.scale(1, 1, squashZ)
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ring.translate(0, crownY(rr) + topCord * 0.05, 0)
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ropePieces.push(ring)
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}
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// --- Stray stalks ----------------------------------------------------
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// Each `wisps` unit spawns ~2.2 thin stalks. Clustered where the
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// reference silhouette actually breaks: the top rim and the base ring.
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// Every root sits 28% of the stalk length INSIDE the body; base stalks
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// clamp their droop so no tip reaches the floor.
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const wispPieces: BufferGeometry[] = []
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const wispCount = Math.max(0, Math.round(config.wisps * 2.2))
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const thickness = R * 0.013
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for (let i = 0; i < wispCount; i += 1) {
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const wl = R * 2 * (0.07 + random() * 0.09) // 7% to 16% of the diameter
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// All stalk tints stay in the pale straw family: a darker minority
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// rendered as twigs or debris wherever they crossed the lighter top.
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const pale = random() < 0.55
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const wisp = boxGeometry(
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[wl, thickness * (0.5 + random() * 0.7), thickness],
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[wl * 0.22, 0, 0], // spans -0.28..+0.72 of wl: root quarter buried
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pale ? tint('strawPale', -0.04, 1.0) : tint('straw', 0.1, 1.0),
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)
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const a = random() * Math.PI * 2
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const lane = i % 10
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let rr: number
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let y: number
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let tilt: number
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if (lane < 4) {
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// Top rim: outward and upward, breaking the shoulder line. Minimum
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// tilt 0.15: at 0.05 a stalk near the shoulder lay almost tangent
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// to the crown and read as debris dropped on the top.
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tilt = 0.15 + random() * 0.5
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y = H * (0.9 + random() * 0.05)
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rr = R * 0.82
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} else if (lane < 7) {
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// Base ring: outward with a slight droop, tip clamped above floor.
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y = H * (0.05 + random() * 0.06)
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const maxDroop = Math.max(0, (y - 0.012) / (wl * 0.72))
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tilt = -Math.min(0.02 + random() * 0.1, maxDroop)
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rr = wallR(y) - R * 0.07
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} else if (lane < 9) {
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// Wall scatter over the mid-height.
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y = H * (0.16 + random() * 0.66)
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tilt = jitter(random, 0.25)
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rr = wallR(y) - R * 0.08
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} else {
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// Top disc: steep enough that they PROTRUDE (>= 0.5 rad), rooted
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// below the crown surface so none lies flat on it.
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tilt = 0.5 + random() * 0.6
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rr = R * (0.15 + random() * 0.45)
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y = crownY(rr) - wl * 0.28 * Math.sin(tilt) - R * 0.02
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}
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wisp.rotateZ(tilt)
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wisp.rotateY(a)
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wisp.translate(Math.cos(a) * rr, y, -Math.sin(a) * rr * squashZ)
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wispPieces.push(wisp)
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}
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return {
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bale: { slot: 'straw' as const, geometry: mergeColoured([body]) },
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wisps: wispPieces.length > 0
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? { slot: 'straw' as const, geometry: mergeColoured(wispPieces) }
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: undefined,
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ropes: ropePieces.length > 0
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? { slot: 'cloth' as const, geometry: mergeColoured(ropePieces) }
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: undefined,
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}
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},
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}, overrides)
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}
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