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import * as BufferGeometryUtils from 'three/examples/jsm/utils/BufferGeometryUtils.js';
/**
* Authentic LEGO Dimensions & Constants (in meters)
* 1 LDU (LDraw Unit) = 0.4 mm
* 1 LEGO Stud pitch = 8.0 mm = 0.008 m
* 1 LEGO Plate height = 3.2 mm = 0.0032 m
* 1 LEGO Brick height = 9.6 mm = 0.0096 m
* Technic hole diameter = 4.8 mm (radius = 2.4 mm = 0.0024 m)
* Technic pin diameter = 4.8 mm = 0.0048 m
* LEGO Stud diameter = 4.8 mm (radius = 2.4 mm), height = 1.8 mm (0.0018 m)
*/
export const LEGO_COLORS = {
YELLOW: 0xfacc15, // SPIKE Prime Hub & Rim Yellow
AZURE: 0x06b6d4, // SPIKE Prime Motor & Frame Teal / Medium Azure
RED: 0xef4444, // Bright Red Push Plates & Accents
LIGHT_GRAY: 0x94a3b8, // Light Bluish Gray Technic Beams & Gears
DARK_GRAY: 0x334155, // Dark Bluish Gray Baseplates & Chassis
BLACK: 0x18181b, // Technic Friction Pins & Rubber Tires
WHITE: 0xf8fafc, // White Hub Display, Sensors & Chevrons
GREEN: 0x10b981, // High-Vis Green Scoring Indicators & Flags
ORANGE: 0xf97316, // Orange Interaction & Tool Accents
DARK_BLUE: 0x1e3a8a, // Anchor Brackets
} as const;
// Shared Material Cache for Peak Rendering Performance
const materialCache = new Map<number, THREE.MeshStandardMaterial>();
export function getLegoMaterial(color: number, roughness = 0.32, metalness = 0.02): THREE.MeshStandardMaterial {
const key = color * 100 + Math.round(roughness * 10);
let mat = materialCache.get(key);
if (!mat) {
mat = new THREE.MeshStandardMaterial({
color,
roughness,
metalness,
});
materialCache.set(key, mat);
}
return mat;
}
// Reusable Shared Stud Geometry
const studGeom = new THREE.CylinderGeometry(0.0024, 0.0024, 0.0018, 16);
studGeom.translate(0, 0.0009, 0); // Origin at base of stud
/**
* Creates an authentic LEGO Technic Liftarm Beam with rounded semicircular ends
* and punched Technic holes at exact 8mm LEGO pitch.
*/
export function createTechnicBeamGroup(
lengthHoles: number,
color: number = LEGO_COLORS.LIGHT_GRAY,
options: { thickness?: number; width?: number; withPinsAt?: number[] } = {}
): THREE.Group {
const group = new THREE.Group();
const pitch = 0.008; // 8mm hole-to-hole spacing
const beamWidth = options.width ?? 0.0076; // ~7.6mm width
const beamThick = options.thickness ?? 0.0078; // ~7.8mm height
const holeRadius = 0.0024; // 4.8mm diameter
const beamMat = getLegoMaterial(color);
const holeMat = getLegoMaterial(LEGO_COLORS.BLACK, 0.8, 0.0);
const pinMat = getLegoMaterial(LEGO_COLORS.BLACK, 0.5, 0.1);
const spanLength = (lengthHoles - 1) * pitch;
// 1. Center rectangular bar & rounded ends (merged into 1 mesh)
const beamGeoms: THREE.BufferGeometry[] = [];
if (spanLength > 0.0001) {
beamGeoms.push(new THREE.BoxGeometry(spanLength, beamThick, beamWidth));
}
const endCapLeft = new THREE.CylinderGeometry(beamWidth / 2, beamWidth / 2, beamThick, 16);
endCapLeft.rotateX(Math.PI / 2);
endCapLeft.translate(-spanLength / 2, 0, 0);
beamGeoms.push(endCapLeft);
const endCapRight = new THREE.CylinderGeometry(beamWidth / 2, beamWidth / 2, beamThick, 16);
endCapRight.rotateX(Math.PI / 2);
endCapRight.translate(spanLength / 2, 0, 0);
beamGeoms.push(endCapRight);
const mergedBeamGeom = BufferGeometryUtils.mergeGeometries(beamGeoms, false);
if (mergedBeamGeom) {
const beamMesh = new THREE.Mesh(mergedBeamGeom, beamMat);
beamMesh.castShadow = true;
beamMesh.receiveShadow = true;
group.add(beamMesh);
}
for (const g of beamGeoms) g.dispose();
// 2. Technic holes & pins (merged per material)
const holeGeoms: THREE.BufferGeometry[] = [];
const pinGeoms: THREE.BufferGeometry[] = [];
for (let i = 0; i < lengthHoles; i++) {
const holeX = -spanLength / 2 + i * pitch;
const isPin = options.withPinsAt?.includes(i);
if (isPin) {
const pinGeom = new THREE.CylinderGeometry(holeRadius * 1.25, holeRadius * 1.25, beamThick * 1.3, 12);
pinGeom.translate(holeX, 0, 0);
pinGeoms.push(pinGeom);
} else {
const hGeom = new THREE.CylinderGeometry(holeRadius, holeRadius, beamThick + 0.0004, 12);
hGeom.translate(holeX, 0, 0);
holeGeoms.push(hGeom);
}
}
if (pinGeoms.length > 0) {
const mergedPins = BufferGeometryUtils.mergeGeometries(pinGeoms, false);
if (mergedPins) {
const pinMesh = new THREE.Mesh(mergedPins, pinMat);
pinMesh.castShadow = true;
group.add(pinMesh);
}
for (const g of pinGeoms) g.dispose();
}
if (holeGeoms.length > 0) {
const mergedHoles = BufferGeometryUtils.mergeGeometries(holeGeoms, false);
if (mergedHoles) {
const holeMesh = new THREE.Mesh(mergedHoles, holeMat);
group.add(holeMesh);
}
for (const g of holeGeoms) g.dispose();
}
return group;
}
/**
* Creates a LEGO Studded Plate or Brick with genuine embossed cylindrical studs on top.
*/
export function createLegoPlateGroup(
widthStuds: number,
lengthStuds: number,
color: number = LEGO_COLORS.DARK_GRAY,
heightPlates: number = 1,
hasStuds: boolean = true
): THREE.Group {
const group = new THREE.Group();
const pitch = 0.008; // 8mm per stud
// In LDraw, length (L) is along X axis, width (W) is along Z axis
const totalX = lengthStuds * pitch;
const totalZ = widthStuds * pitch;
const totalH = heightPlates * 0.0032; // 3.2mm per plate (9.6mm for brick)
const bodyMat = getLegoMaterial(color);
// In LDraw convention, origin (0,0,0) is at the top face where studs connect.
// The plate/brick body extends downwards from Y = 0 to Y = -totalH.
const bodyGeom = new THREE.BoxGeometry(totalX, totalH, totalZ);
const bodyMesh = new THREE.Mesh(bodyGeom, bodyMat);
bodyMesh.position.set(0, -totalH / 2, 0);
bodyMesh.castShadow = true;
bodyMesh.receiveShadow = true;
group.add(bodyMesh);
// Array of LEGO Studs on top face (Y = 0)
const totalStuds = widthStuds * lengthStuds;
if (hasStuds && totalStuds > 0) {
const studMat = getLegoMaterial(color, 0.28);
const instancedStuds = new THREE.InstancedMesh(studGeom, studMat, totalStuds);
instancedStuds.castShadow = true;
const dummy = new THREE.Object3D();
let idx = 0;
const startX = -totalX / 2 + pitch / 2;
const startZ = -totalZ / 2 + pitch / 2;
for (let lx = 0; lx < lengthStuds; lx++) {
for (let wz = 0; wz < widthStuds; wz++) {
dummy.position.set(startX + lx * pitch, 0, startZ + wz * pitch);
dummy.updateMatrix();
instancedStuds.setMatrixAt(idx++, dummy.matrix);
}
}
instancedStuds.instanceMatrix.needsUpdate = true;
group.add(instancedStuds);
}
return group;
}
/**
* Creates an authentic LEGO Technic Gear with gear teeth, hub flange, and cross-axle hole.
*/
export function createTechnicGearGroup(
teeth: number = 24,
radius: number = 0.020,
color: number = LEGO_COLORS.LIGHT_GRAY,
thickness: number = 0.006
): THREE.Group {
const group = new THREE.Group();
const gearMat = getLegoMaterial(color, 0.35);
const holeMat = getLegoMaterial(LEGO_COLORS.BLACK, 0.7);
// 1. Gear disc & perimeter teeth (merged into 1 mesh)
const gearGeoms: THREE.BufferGeometry[] = [];
const discGeom = new THREE.CylinderGeometry(radius * 0.88, radius * 0.88, thickness, 32);
gearGeoms.push(discGeom);
const toothW = (2 * Math.PI * radius) / (teeth * 2.2);
const toothH = radius * 0.18;
for (let i = 0; i < teeth; i++) {
const angle = (i * 2 * Math.PI) / teeth;
const toothGeom = new THREE.BoxGeometry(toothW, thickness * 0.95, toothH);
toothGeom.rotateY(angle);
toothGeom.translate(Math.sin(angle) * (radius * 0.94), 0, Math.cos(angle) * (radius * 0.94));
gearGeoms.push(toothGeom);
}
const mergedGearGeom = BufferGeometryUtils.mergeGeometries(gearGeoms, false);
if (mergedGearGeom) {
const gearMesh = new THREE.Mesh(mergedGearGeom, gearMat);
gearMesh.castShadow = true;
gearMesh.receiveShadow = true;
group.add(gearMesh);
}
for (const g of gearGeoms) g.dispose();
// 2. Cross axle hole and lightening hub holes (merged into 1 hole mesh)
const holeGeoms: THREE.BufferGeometry[] = [];
const crossGeom1 = new THREE.BoxGeometry(0.0048, thickness + 0.0006, 0.0016);
const crossGeom2 = new THREE.BoxGeometry(0.0016, thickness + 0.0006, 0.0048);
holeGeoms.push(crossGeom1, crossGeom2);
const holeRadius = 0.0024;
const numHubHoles = teeth >= 20 ? 4 : 3;
for (let h = 0; h < numHubHoles; h++) {
const ang = (h * 2 * Math.PI) / numHubHoles + Math.PI / numHubHoles;
const dist = radius * 0.52;
const hubHoleGeom = new THREE.CylinderGeometry(holeRadius, holeRadius, thickness + 0.0004, 12);
hubHoleGeom.translate(Math.sin(ang) * dist, 0, Math.cos(ang) * dist);
holeGeoms.push(hubHoleGeom);
}
const mergedHoles = BufferGeometryUtils.mergeGeometries(holeGeoms, false);
if (mergedHoles) {
const holesMesh = new THREE.Mesh(mergedHoles, holeMat);
group.add(holesMesh);
}
for (const g of holeGeoms) g.dispose();
return group;
}
/**
* Standard LDraw Color ID to Hex Color Mapping
*/
export const LDRAW_COLOR_MAP: Record<number, number> = {
0: 0x18181b, // Black
1: 0x2563eb, // Blue
2: 0x16a34a, // Green
4: 0xdc2626, // Red
5: 0xf43f5e, // Dark Pink
6: 0x78350f, // Brown
7: 0x94a3b8, // Light Gray
8: 0x475569, // Dark Gray
9: 0x38bdf8, // Light Blue
10: 0x86efac, // Bright Green
14: 0xfacc15, // Yellow
15: 0xf8fafc, // White
16: 0x94a3b8, // Main Colour (Default Fallback)
19: 0xd4b996, // Tan
24: 0x18181b, // Edge Colour
27: 0x84cc16, // Lime
28: 0xd97706, // Dark Tan
33: 0x0284c7, // Trans-Dark Blue
34: 0x10b981, // Trans-Green
36: 0xef4444, // Trans-Red
40: 0x000000, // Trans-Black
41: 0x38bdf8, // Trans-Medium Blue
42: 0xa3e635, // Trans-Neon Green
47: 0xf1f5f9, // Trans-Clear
70: 0x94a3b8, // Medium Bluish Gray
71: 0x94a3b8, // Light Bluish Gray (Official LDraw 71)
72: 0x334155, // Dark Bluish Gray (Official LDraw 72)
78: 0x86efac, // Light Green
84: 0xec4899, // Medium Dark Pink
85: 0x475569, // Dark Bluish Gray
86: 0x94a3b8, // Light Bluish Gray
212: 0x67e8f9, // Bright Light Blue
288: 0x14532d, // Dark Green
297: 0xdf9b00, // Warm Gold / Pearl Gold
320: 0x991b1b, // Dark Red
321: 0x0284c7, // Dark Azure
322: 0x06b6d4, // Medium Azure
323: 0x6ee7b7, // Light Aqua
326: 0xd9f99d, // Yellowish Green
484: 0xb45309, // Dark Orange
};
/**
* Returns true if the part is recognized with custom 3D geometry
* rather than the generic 2x2 fallback plate.
*/
export function isKnownLegoPart(partNumber: string, role?: string): boolean {
const clean = partNumber.toLowerCase().replace(/\.dat$/, '').replace(/^bl_/, '');
if (role === 'WHEEL_RIM' || role === 'TIRE_RUBBER' || role === 'CHASSIS_CORE' || role === 'MOTOR_STATOR') return true;
if (clean.includes('57539') || clean.includes('ribbed') || clean.includes('hose')) return true;
if (clean === '50450') return true;
if (role === 'FASTENER_PIN' || role === 'FASTENER_BUSH' || /^(2780|3673|6558|32054|43093|3713|4265c|26287|4304|3749|11214)$/.test(clean)) return true;
if (role === 'FASTENER_AXLE' || /^370[4-9]/.test(clean) || clean === '32062' || clean === '18654' || clean === '4519' || clean === '32073' || clean === '44294' || clean === '3737') return true;
if (clean === '64179' || clean === '39794' || clean === '32531') return true;
if (/^(32555|32556|32556b|32348|80431)$/.test(clean)) return true;
if (role === 'STRUCTURAL_BEAM' || /^(3252[3-6]|32316|40490|60483|32009|32271|87618)/.test(clean)) return true;
if (/^(32013|32014|32015|32016|89678|32034|32184|62462|25214|1750|42003|59443)$/.test(clean)) return true;
if (/^(4740|43898)$/.test(clean)) return true;
if (clean === '4079') return true;
if (clean.includes('970') || clean.includes('973') || clean.includes('3626') || /^(30124b|53118|2447b|64644)$/.test(clean)) return true;
if (clean === '64782') return true;
if (/^(32607|24866|209|2417|33183)$/.test(clean)) return true;
if (/^(3039|3040|3040b|15068|11477|14719|85984|28192)$/.test(clean)) return true;
if (/^(2654|15535|4032|4032a|2447|85861|18674|30340|11213|61485|98138|6141)$/.test(clean)) return true;
if (/^(18980|77850|68568|35480|88072|74611)$/.test(clean)) return true;
if (/^(2431|3069|3069b|3068|3068b|6636|87079)$/.test(clean)) return true;
if (/^(3024|3005|3023|3023b|3004|3700|3022|3003|3021|3002|3020|3001|3710|3010|3666|3009|3460|3008|3795|3034|3832|3031|3032|3035|3030|3036|3028)$/.test(clean)) return true;
return false;
}
/**
* Creates an authentic 3D visual mesh for a specific LEGO element,
* with embossed cylindrical studs, hollow pin holes, or curved surfaces.
*/
export function createLegoBrickMesh(
partNumber: string,
colorHex: number,
role?: string
): THREE.Object3D {
const clean = partNumber.toLowerCase().replace(/\.dat$/, '').replace(/^bl_/, '');
const mat = getLegoMaterial(colorHex);
// 1. Flexible Hose / Ribbed tube segments (e.g. 57539k02, 57539k01)
if (clean.includes('57539') || clean.includes('ribbed') || clean.includes('hose')) {
const geom = new THREE.CylinderGeometry(0.0035, 0.0035, 0.005, 12);
const m = new THREE.Mesh(geom, mat);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 2. Flexible Technic Axle 32L / 256mm (50450)
// Must be checked before standard axles to avoid 4-stud fallback truncation!
if (clean === '50450') {
const len = 0.256; // 640 LDU = 256mm (32L)
const geom = new THREE.CylinderGeometry(0.0024, 0.0024, len, 16);
geom.rotateZ(Math.PI / 2); // Aligned along X axis
geom.translate(len / 2, 0, 0); // Origin in LDraw 50450 is at one end
const m = new THREE.Mesh(geom, mat);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 3. Pins & Bushings (e.g. 2780, 3673, 6558, 32054, 43093, 3713, 4265c, 26287, 4304, 3749, 11214)
if (role === 'FASTENER_PIN' || role === 'FASTENER_BUSH' || /^(2780|3673|6558|32054|43093|3713|4265c|26287|4304|3749|11214)$/.test(clean)) {
if (clean === '3713' || clean === '4265c') {
// Technic Bushing
const h = clean === '4265c' ? 0.004 : 0.0078;
const geom = new THREE.CylinderGeometry(0.0036, 0.0036, h, 14);
geom.rotateZ(Math.PI / 2);
const m = new THREE.Mesh(geom, mat);
m.castShadow = true;
return m;
}
const is3L = clean === '6558' || clean === '32054' || clean === '4304' || clean === '11214';
const len = is3L ? 0.024 : 0.016;
const geom = new THREE.CylinderGeometry(0.0024, 0.0024, len, 12);
geom.rotateZ(Math.PI / 2);
const m = new THREE.Mesh(geom, mat);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 4. Standard Technic Axles (e.g. 3704=2L, 3705=4L, 3706=6L, 3707=8L, 3708=10L, 3737=12L, 4519=3L, 32073=5L, 44294=7L, 32062=2L, 18654)
if (role === 'FASTENER_AXLE' || /^370[4-9]/.test(clean) || clean === '32062' || clean === '18654' || clean === '4519' || clean === '32073' || clean === '44294' || clean === '3737') {
let lengthStuds = 4;
if (clean === '32062' || clean === '3704') lengthStuds = 2;
else if (clean === '4519') lengthStuds = 3;
else if (clean === '3705') lengthStuds = 4;
else if (clean === '32073') lengthStuds = 5;
else if (clean === '3706') lengthStuds = 6;
else if (clean === '44294') lengthStuds = 7;
else if (clean === '3707') lengthStuds = 8;
else if (clean === '3708') lengthStuds = 10;
else if (clean === '3737') lengthStuds = 12;
else {
const lMatch = clean.match(/^370(\d)/);
if (lMatch) lengthStuds = parseInt(lMatch[1], 10);
}
const len = lengthStuds * 0.008;
const geom = new THREE.CylinderGeometry(0.0024, 0.0024, len, 8);
geom.rotateZ(Math.PI / 2);
const m = new THREE.Mesh(geom, mat);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 5. Technic Rectangular & Open Center Frames (e.g. 64179 5x7 frame, 39794 7x11 frame, 32531 4x6 frame)
if (clean === '64179' || clean === '39794' || clean === '32531') {
const wHoles = clean === '64179' ? 5 : clean === '32531' ? 4 : 7;
const lHoles = clean === '64179' ? 7 : clean === '32531' ? 6 : 11;
const pitch = 0.008;
const totalW = wHoles * pitch;
const totalL = lHoles * pitch;
const frameGroup = new THREE.Group();
// Top beam
const bTop = createTechnicBeamGroup(wHoles, colorHex);
bTop.position.set(0, 0, -totalL / 2 + pitch / 2);
frameGroup.add(bTop);
// Bottom beam
const bBottom = createTechnicBeamGroup(wHoles, colorHex);
bBottom.position.set(0, 0, totalL / 2 - pitch / 2);
frameGroup.add(bBottom);
// Left beam
const bLeft = createTechnicBeamGroup(lHoles - 2, colorHex);
bLeft.rotation.y = Math.PI / 2;
bLeft.position.set(-totalW / 2 + pitch / 2, 0, 0);
frameGroup.add(bLeft);
// Right beam
const bRight = createTechnicBeamGroup(lHoles - 2, colorHex);
bRight.rotation.y = Math.PI / 2;
bRight.position.set(totalW / 2 - pitch / 2, 0, 0);
frameGroup.add(bRight);
return frameGroup;
}
// 6. Bent / L-Shape Liftarms (e.g. 32555, 32556, 32556b, 32348, 80431)
if (/^(32555|32556|32556b|32348|80431)$/.test(clean)) {
if (clean === '80431') {
const g = new THREE.Group();
const body = createLegoPlateGroup(1, 2, colorHex, 3, false);
g.add(body);
const socket = new THREE.Mesh(new THREE.SphereGeometry(0.005, 12, 10), mat);
socket.position.set(0.008, 0, 0);
socket.castShadow = true;
g.add(socket);
return g;
}
const lGroup = new THREE.Group();
const is4x4 = clean === '32348';
const arm1Holes = is4x4 ? 4 : 3;
const arm2Holes = is4x4 ? 4 : 5;
const pitch = 0.008;
const beam1 = createTechnicBeamGroup(arm1Holes, colorHex);
beam1.position.set(0, 0, 0);
lGroup.add(beam1);
const beam2 = createTechnicBeamGroup(arm2Holes, colorHex);
if (is4x4) {
beam2.rotation.y = Math.PI * 0.3;
beam2.position.set((arm1Holes - 1) * pitch * 0.4, 0, pitch);
} else {
beam2.rotation.y = Math.PI / 2;
beam2.position.set((arm1Holes - 1) * pitch / 2, 0, (arm2Holes - 1) * pitch / 2);
}
lGroup.add(beam2);
return lGroup;
}
// 7. Technic Beams / Liftarms (e.g. 32523, 32316, 32524, 32525, 40490, 60483, 32009, 32271, 87618)
if (role === 'STRUCTURAL_BEAM' || /^(3252[3-6]|32316|40490|60483|32009|32271|87618)/.test(clean)) {
let holes = 5;
if (clean === '32523' || clean === '32271') holes = 3;
else if (clean === '60483') holes = 2;
else if (clean === '32316' || clean === '87618') holes = 5;
else if (clean === '32524' || clean === '32009') holes = 7;
else if (clean === '40490') holes = 9;
else if (clean === '32525') holes = 11;
else if (clean === '32526') holes = 13;
return createTechnicBeamGroup(holes, colorHex);
}
// 8. Connectors (e.g. 32013, 32014, 32015, 32016, 89678, 32034, 32184, 62462, 25214, 1750, 42003, 59443)
if (/^(32013|32014|32015|32016|89678|32034|32184|62462|25214|1750|42003|59443)$/.test(clean)) {
const group = new THREE.Group();
const c1 = new THREE.CylinderGeometry(0.0036, 0.0036, 0.012, 12);
const m1 = new THREE.Mesh(c1, mat);
m1.castShadow = true;
group.add(m1);
const c2 = new THREE.CylinderGeometry(0.0036, 0.0036, 0.012, 12);
c2.rotateX(Math.PI / 2);
const m2 = new THREE.Mesh(c2, mat);
m2.position.set(0, 0.004, 0.004);
m2.castShadow = true;
group.add(m2);
return group;
}
// 9. Radar Dishes (e.g. 4740 2x2 dish, 43898 3x3 dish)
if (/^(4740|43898)$/.test(clean)) {
const radius = clean === '43898' ? 0.012 : 0.008;
const height = clean === '43898' ? 0.006 : 0.0048;
const dishGeom = new THREE.ConeGeometry(radius, height, 20, 1, true);
dishGeom.rotateX(Math.PI);
const m = new THREE.Mesh(dishGeom, mat);
m.position.set(0, -height / 2, 0);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 10. Minifigure Utensil Seat 2x2 (4079)
if (clean === '4079') {
const chairGroup = new THREE.Group();
const seat = createLegoPlateGroup(2, 2, colorHex, 1, false);
chairGroup.add(seat);
const back = createLegoPlateGroup(2, 2, colorHex, 1, false);
back.rotation.x = Math.PI / 2;
back.position.set(0, 0.008, -0.008);
chairGroup.add(back);
return chairGroup;
}
// 11. Minifigure Body Elements & Accessories
if (clean.includes('970') || clean.includes('973') || clean.includes('3626') || /^(30124b|53118|2447b|64644)$/.test(clean)) {
if (clean.includes('3626')) {
const headGeom = new THREE.CylinderGeometry(0.005, 0.005, 0.010, 14);
const m = new THREE.Mesh(headGeom, mat);
m.castShadow = true;
return m;
} else if (clean.includes('973')) {
const torsoGeom = new THREE.BoxGeometry(0.016, 0.014, 0.008);
const m = new THREE.Mesh(torsoGeom, mat);
m.castShadow = true;
return m;
} else if (clean.includes('970')) {
const legGeom = new THREE.BoxGeometry(0.015, 0.016, 0.008);
const m = new THREE.Mesh(legGeom, mat);
m.castShadow = true;
return m;
} else {
const accGeom = new THREE.CylinderGeometry(0.003, 0.003, 0.012, 10);
const m = new THREE.Mesh(accGeom, mat);
m.castShadow = true;
return m;
}
}
// 12. Technic Panels (e.g. 64782)
if (clean === '64782') {
const geom = new THREE.BoxGeometry(0.024, 0.088, 0.003);
const m = new THREE.Mesh(geom, mat);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 13. Foliage / Flowers / Plants / Coral (e.g. 32607, 24866, 209, 2417, 33183)
if (/^(32607|24866|209|2417|33183)$/.test(clean)) {
const plantGroup = new THREE.Group();
const count = clean === '2417' ? 5 : 3;
for (let i = 0; i < count; i++) {
const angle = (i * 2 * Math.PI) / count;
const leafGeom = new THREE.ConeGeometry(0.005, 0.014, 6);
leafGeom.rotateZ(Math.PI / 4);
const leaf = new THREE.Mesh(leafGeom, mat);
leaf.position.set(Math.cos(angle) * 0.007, 0.006, Math.sin(angle) * 0.007);
leaf.rotation.y = angle;
leaf.castShadow = true;
plantGroup.add(leaf);
}
return plantGroup;
}
// 14. Slope Bricks & Curved Slopes (e.g. 3039, 3040, 3040b, 15068, 11477, 14719, 85984, 28192)
if (/^(3039|3040|3040b|15068|11477|14719|85984|28192)$/.test(clean)) {
const is1x2 = clean === '3040' || clean === '3040b' || clean === '11477';
const widthStuds = is1x2 ? 1 : 2;
const lengthStuds = 2;
const totalW = widthStuds * 0.008;
const totalL = lengthStuds * 0.008;
const totalH = 0.0096;
const geom = new THREE.CylinderGeometry(0.0001, totalW / 2, totalH, 4);
geom.rotateY(Math.PI / 4);
geom.scale(totalL / totalW, 1, 1);
const m = new THREE.Mesh(geom, mat);
m.position.set(0, -totalH / 2, 0);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 15. Round Plates & Discs (e.g. 2654, 15535, 4032, 4032a, 2447, 85861, 18674, 30340, 11213, 61485, 98138, 6141)
if (/^(2654|15535|4032|4032a|2447|85861|18674|30340|11213|61485|98138|6141)$/.test(clean)) {
let radius = 0.008;
if (clean === '11213') radius = 0.024;
else if (clean === '85861' || clean === '98138' || clean === '6141') radius = 0.004;
const height = 0.0032;
const geom = new THREE.CylinderGeometry(radius, radius, height, 18);
const m = new THREE.Mesh(geom, mat);
m.position.set(0, -height / 2, 0);
m.castShadow = true;
m.receiveShadow = true;
return m;
}
// 16. Brackets & Modified Plates (e.g. 18980, 77850, 68568, 35480, 88072, 74611)
if (/^(18980|77850|68568|35480|88072|74611)$/.test(clean)) {
return createLegoPlateGroup(1, 2, colorHex, 1, true);
}
// 17. Smooth Tiles (without studs, e.g. 2431 1x4, 3069/3069b 1x2, 3068b 2x2, 6636 1x6, 87079 2x4)
if (/^(2431|3069|3069b|3068|3068b|6636|87079)$/.test(clean)) {
let tw = 1, tl = 2;
if (clean.startsWith('2431')) { tw = 1; tl = 4; }
else if (clean.startsWith('3068')) { tw = 2; tl = 2; }
else if (clean.startsWith('6636')) { tw = 1; tl = 6; }
else if (clean.startsWith('87079')) { tw = 2; tl = 4; }
return createLegoPlateGroup(tw, tl, colorHex, 1, false);
}
// 18. Standard Bricks & Plates with Genuine Studs (e.g. 3001 2x4, 3003 2x2, 3004 1x2, 3005 1x1, 3010 1x4, 3020 2x4, 3035 4x8, etc.)
let w = 2, l = 2, hPlates = 1;
if (/^(3024|3005)$/.test(clean)) { w = 1; l = 1; }
else if (/^(3023|3023b|3004|3700)$/.test(clean)) { w = 1; l = 2; }
else if (/^(3022|3003)$/.test(clean)) { w = 2; l = 2; }
else if (/^(3021|3002)$/.test(clean)) { w = 2; l = 3; }
else if (/^(3020|3001)$/.test(clean)) { w = 2; l = 4; }
else if (/^(3710|3010)$/.test(clean)) { w = 1; l = 4; }
else if (/^(3666|3009)$/.test(clean)) { w = 1; l = 6; }
else if (/^(3460|3008)$/.test(clean)) { w = 1; l = 8; }
else if (/^(3795)$/.test(clean)) { w = 2; l = 6; }
else if (/^(3034)$/.test(clean)) { w = 2; l = 8; }
else if (/^(3832)$/.test(clean)) { w = 2; l = 10; }
else if (/^(3031)$/.test(clean)) { w = 4; l = 4; }
else if (/^(3032)$/.test(clean)) { w = 4; l = 6; }
else if (/^(3035)$/.test(clean)) { w = 4; l = 8; }
else if (/^(3030)$/.test(clean)) { w = 4; l = 10; }
else if (/^(3036)$/.test(clean)) { w = 6; l = 8; }
else if (/^(3028)$/.test(clean)) { w = 6; l = 12; }
// Bricks are 3 plates high (9.6mm)
if (/^(3001|3002|3003|3004|3005|3010|3009|3008|3700)$/.test(clean)) {
hPlates = 3;
}
return createLegoPlateGroup(w, l, colorHex, hPlates, true);
}
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