284 lines
11 KiB
TypeScript
284 lines
11 KiB
TypeScript
/**
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* @contemporary-props/wheeled-waste-bin
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*
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* A tapered ribbed moulding with a hinged lid on an axle, and the catalogue's
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* thirty-second row: the first appearance of the wheel part. The wheel itself
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* lives in core rather than here, because four later rows in three other
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* domains want the same one -- the sack truck and the wheelbarrow in tools, the
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* shopping trolley in retail, the task chair in the office -- and a wheel
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* written inside a bin is a wheel each of them rewrites.
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*
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* Measured against the 240 litre bin, which is the one on every kerb: 1080 mm
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* to the top of the lid, 580 across the front, 740 front to back, on 200 mm
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* wheels. The body tapers about a tenth from its rim to its base, which is not
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* styling -- it is draft, so the moulding leaves the tool, and it is the reason
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* these things stack.
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*
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* The lid hinges on the axle bar across the back, so its origin is that bar and
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* nothing else. It also OVERHANGS at the front, which is what makes the lip you
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* lift it by, and the gussets under the rim are the moulded ribs that stop a
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* thin-walled box that size from folding when it is tipped.
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*/
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import { type BufferGeometry } from 'three'
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import {
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bakeOcclusion,
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chamferedBoxGeometry,
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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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smoothNormals,
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wheelGeometry,
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type RuntimeContext,
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} from '../core/index.ts'
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export interface WasteBinConfig {
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/** Height to the top of the closed lid (metres). */
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readonly height: number
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/** Width across the front (metres). */
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readonly width: number
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/** Depth, front to back (metres). */
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readonly depth: number
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/** How far the lid is open, 0 shut to 1 back on its hinge. */
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readonly open: number
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readonly seed: number
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}
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export const wasteBinDefaults: WasteBinConfig = {
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height: 1.08,
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width: 0.58,
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depth: 0.74,
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open: 0,
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seed: 61,
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}
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export type WasteBinParts = 'body' | 'lid' | 'wheels' | 'tyres'
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export interface WasteBinActions {
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/** Swings the lid back on its hinge. 1 is fully open. */
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open(amount?: number): void
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/** Rolls the wheels. 1 is a full turn. */
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roll(turns?: number): void
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}
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function applyOpen(
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runtime: RuntimeContext<WasteBinConfig, WasteBinParts>,
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amount: number,
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): void {
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// Just past square, which is where a bin lid actually falls to when it is
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// thrown back: it goes over centre and rests against the body.
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runtime.parts.lid.anchor.rotation.x = Math.min(1, Math.max(0, amount)) * 1.9
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}
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export function createModel(overrides: Partial<WasteBinConfig> = {}) {
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let heldOpen = 0
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let seenOpen = Number.NaN
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return createKitModel<
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WasteBinConfig, 'plastic' | 'rubber', WasteBinParts, WasteBinActions
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>({
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id: 'wheeled-waste-bin',
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defaults: wasteBinDefaults,
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slots: ['plastic', 'rubber'],
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build: ({ config, random }) => {
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const tint = createTinter(random)
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const H = Math.min(1.4, Math.max(0.7, config.height))
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const W = Math.min(0.9, Math.max(0.35, config.width))
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const D = Math.min(1.1, Math.max(0.4, config.depth))
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// Down from the palette's plastic, which is set for the pale mouldings
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// most of the kit's plastic is. A municipal bin is a mid grey, and at the
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// palette's own value the body came out near white and read as a fridge.
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const shell = tint('plastic', -0.33 + jitter(random, 0.02))
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const dark = tint('plastic', -0.46, 0.6)
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const wheelR = H * 0.093
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const lidH = H * 0.085
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const bodyTop = H - lidH
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const bodyBase = wheelR * 0.28
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// A tenth of draft between rim and base, which is what lets the moulding
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// leave the tool and what makes a rank of these nest.
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const taper = 0.9
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const bodyPieces: BufferGeometry[] = []
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/* --------------------------------------------------------------- body */
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bodyPieces.push(chamferedBoxGeometry(
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[W * taper, D * taper], [W, D],
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bodyTop - bodyBase, W * 0.075, [0, (bodyTop + bodyBase) / 2, 0], shell,
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))
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// The rim: a flange right round the top, which is what the lid sits on
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// and what a lifter's forks catch under.
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bodyPieces.push(chamferedBoxGeometry(
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[W * 1.028, D * 1.028], [W * 1.02, D * 1.02],
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H * 0.03, W * 0.02, [0, bodyTop - H * 0.012, 0], shell,
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))
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/**
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* The gussets under the rim.
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*
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* They are the dark triangles in every photograph of one of these and
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* they are structural: a thin-walled box 1.1 m tall folds at the rim when
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* it is tipped, so the moulding carries a rib every 150 mm or so. Left
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* off, the body reads as a bin bag holder.
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*/
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const ribs = Math.max(4, Math.round(W / 0.15) * 2 + Math.round(D / 0.15) * 2)
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for (let i = 0; i < ribs; i += 1) {
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const t = (i + 0.5) / ribs
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// Walk the rim's perimeter, so the ribs sit on all four faces without
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// four separate loops and without bunching at the corners.
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const a = t * Math.PI * 2
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const ex = Math.cos(a)
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const ez = Math.sin(a)
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const scale = 1 / Math.max(Math.abs(ex) / (W / 2), Math.abs(ez) / (D / 2))
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const x = ex * scale
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const z = ez * scale
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// Short and broad at the top, tapering to nothing: a gusset, not a
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// tooth. At three quarters of this length they hung below the rim in a
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// row and the bin came out fringed.
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// Measured off the reference at 7% of the body's height, which is
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// between the two rounds that argued about it: at 7.5% they hung below
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// the rim like a fringe, at 4.2% the critic called them shallow, and
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// neither reading was taken from the photograph.
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const rib = chamferedBoxGeometry(
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[W * 0.06, W * 0.08], [W * 0.03, W * 0.01],
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H * 0.06, W * 0.008, [0, 0, 0], dark,
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)
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rib.translate(x * 0.985, bodyTop - H * 0.052, z * 0.985)
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bodyPieces.push(rib)
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}
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/* ---------------------------------------------------------------- lid */
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/**
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* A domed lid that OVERHANGS at the front.
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*
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* Flush with the body it is a flat cap and there is nothing to lift it
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* by; the reference's stands proud all round and further at the front,
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* where the lip is. The dome is two steps rather than a curve because a
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* blow-moulded lid is exactly that: a flat crown with a shoulder.
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*/
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const hingeZ = D * 0.5
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const lidPieces: BufferGeometry[] = []
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lidPieces.push(chamferedBoxGeometry(
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[W * 1.05, D * 1.03], [W * 1.02, D * 1.0],
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lidH * 0.55, W * 0.03, [0, bodyTop + lidH * 0.275, -D * 0.01], shell,
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))
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lidPieces.push(chamferedBoxGeometry(
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[W * 0.94, D * 0.9], [W * 0.8, D * 0.76],
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lidH * 0.5, W * 0.035, [0, bodyTop + lidH * 0.72, -D * 0.02], shell,
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))
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// The two shoulders running front to back, which every blow-moulded lid
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// has and which are the only thing breaking a half square metre of flat
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// grey. They are stiffeners, so they run the long way.
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for (const side of [-1, 1]) {
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lidPieces.push(chamferedBoxGeometry(
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[W * 0.2, D * 0.72], [W * 0.15, D * 0.66],
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lidH * 0.22, W * 0.03,
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[side * W * 0.24, bodyTop + lidH * 0.96, -D * 0.03], shell,
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))
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}
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// The lip at the front, which is the handle.
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lidPieces.push(chamferedBoxGeometry(
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[W * 0.5, D * 0.05], [W * 0.44, D * 0.035],
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lidH * 0.34, W * 0.012,
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[0, bodyTop + lidH * 0.2, -D * 0.5 - D * 0.012], dark,
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))
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/* -------------------------------------------------- axle and the wheels */
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/**
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* The wheels come from core, and they come as two geometries.
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*
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* A wheel is a tyre and a hub in two different materials, and this kit
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* gives one slot per part -- so the helper hands back both and the model
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* puts each in its own part. Merged into one, a consumer who recoloured
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* the bin's plastic would get plastic tyres.
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*/
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const wheelX = W * 0.5 - wheelR * 0.42
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const wheelZ = D * 0.5 - wheelR * 0.85
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const tyrePieces: BufferGeometry[] = []
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const hubPieces: BufferGeometry[] = []
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// Set from the wheel's own contact radius rather than from its nominal
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// one: see `Wheel.contact`. At the radius the bin hovered a millimetre.
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let wheelY = wheelR
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for (const side of [-1, 1]) {
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const { tyre, hub, contact } = wheelGeometry({
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radius: wheelR,
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width: wheelR * 0.42,
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spokes: 5,
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tyre: tint('rubber', jitter(random, 0.02)),
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// As dark as the tyre nearly. A pale hub on a black tyre reads as a
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// flat disc stuck to the wheel rather than as a recess in it, which
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// is what the spokes are there to show.
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hub: tint('plastic', -0.52, 0.4),
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})
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wheelY = contact
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tyre.translate(side * wheelX, wheelY, wheelZ)
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hub.translate(side * wheelX, wheelY, wheelZ)
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tyrePieces.push(tyre)
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hubPieces.push(hub)
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}
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// The axle between them, and the two stub brackets the body carries it on.
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bodyPieces.push(latheGeometry([
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{ y: -wheelX, radius: wheelR * 0.13 },
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{ y: wheelX, radius: wheelR * 0.13 },
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], 10, [0, 0, 0], dark, { capBottom: false, capTop: false })
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.rotateZ(Math.PI / 2)
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.translate(0, wheelY, wheelZ))
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// The hinge bar across the back, which the lid turns on and the handle
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// a bin is wheeled by.
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bodyPieces.push(latheGeometry([
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{ y: -W * 0.46, radius: H * 0.014 },
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{ y: W * 0.46, radius: H * 0.014 },
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], 12, [0, 0, 0], dark, { capBottom: true, capTop: true })
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.rotateZ(Math.PI / 2)
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// Proud of the lid at the back rather than under it: the hinge bar is
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// also the handle a bin is wheeled by, and a hinge nobody can see is a
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// hinge the model does not demonstrate.
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.translate(0, bodyTop + H * 0.042, hingeZ + H * 0.012))
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bakeOcclusion(bodyPieces, { strength: 0.4 })
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const hinge = [0, bodyTop + H * 0.042, hingeZ + H * 0.012] as const
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return {
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body: { slot: 'plastic' as const, geometry: smoothNormals(mergeColoured(bodyPieces), 38) },
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lid: {
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slot: 'plastic' as const,
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geometry: smoothNormals(
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mergeColoured(lidPieces).translate(-hinge[0], -hinge[1], -hinge[2]), 38,
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),
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origin: hinge,
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},
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wheels: { slot: 'plastic' as const, geometry: smoothNormals(mergeColoured(hubPieces), 40) },
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tyres: { slot: 'rubber' as const, geometry: smoothNormals(mergeColoured(tyrePieces), 40) },
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}
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},
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actions: (runtime) => {
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heldOpen = runtime.getConfig().open
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seenOpen = heldOpen
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applyOpen(runtime, heldOpen)
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return {
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open: (amount = 1) => { heldOpen = amount; applyOpen(runtime, amount) },
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roll: (turns = 0.25) => {
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// The wheels turn about their own axle, which is where both wheel
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// parts already sit, so one rotation on each is the whole action.
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for (const name of ['wheels', 'tyres'] as const) {
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runtime.parts[name].anchor.rotation.x = -turns * Math.PI * 2
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}
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},
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}
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},
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update: (_dt, runtime) => {
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const wanted = runtime.getConfig().open
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if (wanted !== seenOpen) { seenOpen = wanted; heldOpen = wanted }
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applyOpen(runtime, heldOpen)
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},
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}, overrides)
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}
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