A few more ux refinements, and added the ability to hide captions

is making large objects like the 120-cell noticeably stuttery

cellindex.js

@@ -1,4 +1,17 @@
-export const INDEX = {
+
+export const LAYER_NAMES = {
+	0: "North pole",
+	1: "Arctic circle",
+	2: "North temperate",
+	3: "Tropic of Cancer",
+	4: "Equator",
+	5: "Tropic of Capricorn",
+	6: "South temperate",
+	7: "Antarctic circle (all)"
+};
+
+
+export const INDEX120 = {
 	"1": [
 		27,38,48,49,61,68,74,87,95,98,105,120, 126,131,140,149,156,165,174,
 		179,185,200,207,210,218,223,226,231,234,239,241,248,252,253,258,263,
@@ -46,7 +59,7 @@ export const INDEX = {
 };
 
 
-export const LAYERS =  {
+export const LAYERS120 =  {
 	"0": [154,266,158,222,218,250,254,162,268,156,160,252,256,166,270,272,
 		164,220,224,168],
 	"1": [2,318,314,30,414,510,362,26,506,410,338,458,462,110,
@@ -90,3 +103,86 @@ export const LAYERS =  {
 	"7":[217,153,221,157,265,161,165,269,249,253,251,255,267,159,155,
 		163,219,271,223,167]
 };
+
+// Schoute's partition via https://arxiv.org/abs/1010.4353
+
+export const PARTITION600 = {
+
+	"2,0,0,0": 1,
+	"0,2,0,0": 1,
+	"0,0,2,0": 1,
+	"0,0,0,2": 1,
+	"1,1,1,1": 1,
+	"1,1,-1,-1": 1,
+	"1,-1,1,-1": 1,
+	"1,-1,-1,1": 1,
+	"1,-1,-1,-1": 1,
+	"1,-1,1,1": 1,
+	"1,1,-1,1": 1,
+	"1,1,1,-1": 1,
+
+	"k,0,-t,-1": 2,
+	"0,k,1,-t": 2,
+	"t,-1,k,0": 2,
+	"1,t,0,k": 2,
+	"t,k,0,-1": 2,
+	"1,0,k,t": 2,
+	"k,-t,-1,0": 2,
+	"0,1,-t,k": 2,
+	"1,k,t,0": 2,
+	"t,0,-1,k": 2,
+	"0,t,-k,-1": 2,
+	"k,-1,0,-t": 2,
+
+	"t,0,1,k": 3,
+	"0,t,-k,1": 3,
+	"1,-k,-t,0": 3,
+	"k,1,0,-t": 3,
+	"0,k,1,t": 3,
+	"t,1,-k,0": 3,
+	"k,0,t,-1": 3,
+	"1,-t,0,k": 3,
+	"t,-k,0,-1": 3,
+	"0,1,-t,-k": 3,
+	"1,0,-k,t": 3,
+	"k,t,1,0": 3,
+
+	"t,0,-1,-k": 4,
+	"0,t,k,-1": 4,
+	"1,-k,t,0": 4,
+	"k,1,0,t": 4,
+	"t,1,k,0": 4,
+	"0,k,-1,-t": 4,
+	"1,-t,0,-k": 4,
+	"k,0,-t,1": 4,
+	"0,1,t,k": 4,
+	"t,-k,0,1": 4,
+	"k,t,-1,0": 4,
+	"1,0,k,-t": 4,
+
+	"k,0,t,1": 5,
+	"0,k,-1,t": 5,
+	"t,-1,-k,0": 5,
+	"1,t,0,-k": 5,
+	"1,0,-k,-t": 5,
+	"t,k,0,1": 5,
+	"0,1,t,-k": 5,
+	"k,-t,1,0": 5,
+	"t,0,1,-k": 5,
+	"1,k,-t,0": 5,
+	"k,-1,0,t": 5,
+	"0,t,k,1": 5
+};
+
+
+
+export const LAYERS600 = {
+	"0":[2,42,46,50,54,106,110,44,48,52,56,108,112],
+	"1":[10,12,14,16,18,20,22,24,34,36,38,40,98,102,100,104,90,92,94,96],
+	"2":[26,58,74,28,76,30,60,32,62,78,80,64],
+	"3":[3,4,5,6,7,8,65,113,81,66,114,82,67,115,83,68,116,84,69,117,85,70,118,86,71,119,87,72,120,88],
+	"4":[25,29,27,31,57,61,59,63,73,75,77,79],
+	"5":[97,101,99,103,33,35,37,39,89,91,93,95,9,11,13,15,17,19,21,23],
+	"6":[41,105,49,43,51,45,107,47,109,53,55,111],
+	"7":[1]
+};

colours.js

@@ -1,14 +1,20 @@
 import ColorScheme from 'color-scheme';
+import Color from 'color';
 
 export const get_colours = (basis) => {
+	const basis_c = Color(basis);
+	const hslb = basis_c.hsl();
+	const hue = hslb['color'][0];
+	const saturation = hslb['color'][1];
+	const luminance = hslb['color'][2];
 	const scheme = new ColorScheme;
-	const hexbasis = basis.toString(16).padStart(6, "0");
+	scheme.from_hue(hue).scheme("tetrade").distance(0.75);
-	scheme.from_hex(hexbasis).scheme("tetrade").variation("hard").distance(0.5);
+	const colours = scheme.colors().slice(1, 9);
-	const colours = scheme.colors().map((cs) => parseInt('0x' + cs));
+	colours.reverse();
-	const set = colours.slice(1, 9);
+	const hsl = colours.map((c) => Color("#" + c).hsl());
-	set.reverse();
+	const resaturated = hsl.map((hslc) => hslc.saturationl(saturation).rgbNumber()); 
-	set.unshift(colours[0]);
+	resaturated.unshift(basis);
-	return set;
+	return resaturated;
 }
 
 // basic colours where 0 = blue

fourDShape.js

@@ -2,7 +2,7 @@ import * as THREE from 'three';
 
 
 const HYPERPLANE = 2.0;
-
+const W_FORESHORTENING = 0.04;
 
 class FourDShape extends THREE.Group {
 
@@ -15,11 +15,10 @@ class FourDShape extends THREE.Group {
 		this.nodes3 = {};
 		this.links = structure.links;
 		this.faces = ( "faces" in structure ) ? structure.faces : [];
-		this.node_size = structure.geometry.node_size;
-		this.link_size = structure.geometry.link_size;
 		this.node_scale = 1;
 		this.link_scale = 1;
 		this.hyperplane = HYPERPLANE;
+		this.foreshortening = W_FORESHORTENING;
 		this.initShapes();
 	}
 
@@ -35,7 +34,7 @@ class FourDShape extends THREE.Group {
 		}
 	}
 
-	makeNode(material, v3) {
+	makeNode(material, v3, scale) {
 		const geometry = new THREE.SphereGeometry(this.node_size);
 		const sphere = new THREE.Mesh(geometry, material);
 		sphere.position.copy(v3);
@@ -44,32 +43,43 @@ class FourDShape extends THREE.Group {
 	}
 
 	makeLink(material, link) {
-		const n1 = this.nodes3[link.source].v3;
+		const n1 = this.nodes3[link.source];
-		const n2 = this.nodes3[link.target].v3;
+		const n2 = this.nodes3[link.target];
-		const length = n1.distanceTo(n2);
+		const s1 = n1.scale;
+		const s2 = n2.scale;
+		const length = n1.v3.distanceTo(n2.v3);
 		const centre = new THREE.Vector3();
-		centre.lerpVectors(n1, n2, 0.5);
+		centre.lerpVectors(n1.v3, n2.v3, 0.5);
-		const geometry = new THREE.CylinderGeometry(this.link_size, this.link_size, 1);
+		const geometry = new THREE.CylinderGeometry(
+			this.link_scale * s2, this.link_scale * s1, 1,
+			16, 1, true
+		);
 		const cyl = new THREE.Mesh(geometry, material);
 		const edge = new THREE.Group();
 		edge.add(cyl);
 		edge.position.copy(centre);
 		edge.scale.copy(new THREE.Vector3(1, 1, length));
-		edge.lookAt(n2);
+		edge.lookAt(n2.v3);
 		cyl.rotation.x = Math.PI / 2.0;
 		this.add(edge);
 		return edge;
 	}
 
 	updateLink(link, links_show) {
-		const n1 = this.nodes3[link.source].v3;
+		const n1 = this.nodes3[link.source];
-		const n2 = this.nodes3[link.target].v3;
+		const n2 = this.nodes3[link.target];
-		const length = n1.distanceTo(n2);
+		const s1 = n1.scale;
+		const s2 = n2.scale;
+		const length = n1.v3.distanceTo(n2.v3);
 		const centre = new THREE.Vector3();
-		centre.lerpVectors(n1, n2, 0.5);
+		centre.lerpVectors(n1.v3, n2.v3, 0.5);
-		link.object.scale.copy(new THREE.Vector3(this.link_scale, this.link_scale, length));
+		// take the average of the ends as the thickness - as a workaround,
+		// because I haven't worked out how to reshape tapered links without
+		// having to reassign a new geometry to every link
+		const link_mean = this.link_scale * (s1 + s2) * 0.5;		
+		link.object.scale.copy(new THREE.Vector3(link_mean, link_mean, length));
 		link.object.position.copy(centre);
-		link.object.lookAt(n2);
+		link.object.lookAt(n2.v3);
 		link.object.children[0].rotation.x = Math.PI / 2.0;
 		link.object.visible = (!links_show || link.label in links_show); 
 	}
@@ -100,24 +110,42 @@ class FourDShape extends THREE.Group {
 	}
 
 
-	fourDtoV3(x, y, z, w, rotations) {
+	fourDtoV3_old(x, y, z, w, rotations) {
 		const v4 = new THREE.Vector4(x, y, z, w);
 		for ( const m4 of rotations ) {
 			v4.applyMatrix4(m4);
 		}
-		const k = this.hyperplane / (this.hyperplane + v4.w);
+		const k = this.fourDscale(v4.w);
 		return new THREE.Vector3(v4.x * k, v4.y * k, v4.z * k);
 	}
 
+	fourDscale(w) {
+		return this.hyperplane / ( this.hyperplane + w );
+	}
+	
+	fourDrotate(x, y, z, w, rotations) {
+		const v4 = new THREE.Vector4(x, y, z, w);
+		for ( const m4 of rotations ) {
+			v4.applyMatrix4(m4);
+		}
+		return v4;
+	}
+
+	fourDtoV3(v4) {
+		const k = this.fourDscale(v4.w);
+		return new THREE.Vector3(v4.x * k, v4.y * k, v4.z * k);		
+	}
 
 	initShapes() {
 		for( const n of this.nodes4 ) {
-			const v3 = this.fourDtoV3(n.x, n.y, n.z, n.w, []);
+			const k = this.fourDscale(n.w);
+			const v3 = new THREE.Vector3(n.x * k, n.y * k, n.z * k);
 			const material = this.getMaterial(n, this.node_ms);
 			this.nodes3[n.id] = {
 				v3: v3,
+				scale: k,
 				label: n.label,
-				object: this.makeNode(material, v3)
+				object: this.makeNode(material, v3, k)
 			};
 		}
 		for( const l of this.links ) {
@@ -134,10 +162,15 @@ class FourDShape extends THREE.Group {
 	render3(rotations, nodes_show, links_show) {
 		this.scalev3 = new THREE.Vector3(this.node_scale, this.node_scale, this.node_scale);
 		for( const n of this.nodes4 ) {
-			const v3 = this.fourDtoV3(n.x, n.y, n.z, n.w, rotations);
+			const v4 = this.fourDrotate(n.x, n.y, n.z, n.w,  rotations);
+			const k = this.fourDscale(v4.w);
+			const v3 = new THREE.Vector3(v4.x * k, v4.y * k, v4.z * k);
+			const s4 = k * this.node_scale * this.foreshortening;
+			const s3 = new THREE.Vector3(s4, s4, s4);
 			this.nodes3[n.id].v3 = v3;
+			this.nodes3[n.id].scale = k * this.foreshortening;
 			this.nodes3[n.id].object.position.copy(v3);
-			this.nodes3[n.id].object.scale.copy(this.scalev3);
+			this.nodes3[n.id].object.scale.copy(s3);
 			this.nodes3[n.id].object.visible = ( !nodes_show || n.label in nodes_show );
 		}
 		for( const l of this.links ) {

gui.js

@@ -2,20 +2,25 @@ import { GUI } from 'lil-gui';
 
 
 const DEFAULTS = {
-	thickness: 0.25,
+	nodesize: 0.25,
-	nodesize: 1.25,
+	nodeopacity: 1,
-	linkopacity: 0.5,
+	linksize: 0.2,
-	link2opacity: 0.5,
+	linkopacity: 0.75,
-	shape: '',
+	link2opacity: 0.75,
-	option: '',
+	shape: '120-cell',
+	option: 'none',
 	visibility: 5,
 	inscribed: false,
 	inscribe_all: false,
 	color: 0x3293a9,
 	background: 0xd4d4d4,
-	hyperplane: 2,
+	hyperplane: 0.93,
-	rotation: 'rigid',
+	zoom: 1,
+	xRotate: 'YW',
+	yRotate: 'XW',
 	dtheta: 0,
+	damping: false,
+	captions: true,
 	dpsi: 0,
 }
 
@@ -23,12 +28,9 @@ const DEFAULTS = {
 
 class FourDGUI {
 
-	constructor(shapes, changeShape, setColor, setBackground, setLinkOpacity, setVisibility) {
+	constructor(shapes, changeShape, setColor, setBackground, setNodeOpacity,setLinkOpacity, setVisibility, showDocs) {
 		this.gui = new GUI();
 		const SHAPE_NAMES = shapes.map((s) => s.name);
-		// set default shape + option from the first shape
-		DEFAULTS.shape = shapes[0].name;
-		DEFAULTS.option = shapes[0].options[0].name;
 
 		this.parseLinkParams();
 		const guiObj = this;
@@ -37,16 +39,20 @@ class FourDGUI {
 			option: this.link['option'],
 			inscribed: this.link['inscribed'],
 			inscribe_all: this.link['inscribe_all'],
-			thickness: this.link['thickness'],
+			linksize: this.link['linksize'],
 			linkopacity: this.link['linkopacity'],
 			link2opacity: this.link['linkopacity'],
 			nodesize: this.link['nodesize'],
+			nodeopacity: this.link['nodeopacity'],
 			depth: this.link['depth'],
 			color: this.link['color'],
 			background: this.link['background'],
 			hyperplane: this.link['hyperplane'],
-			rotation: this.link['rotation'],
+			zoom: this.link['zoom'],
+			xRotate: this.link['xRotate'],
+			yRotate: this.link['yRotate'],
 			damping: false,
+			captions: true,
 			dtheta: this.link['dtheta'],
 			dpsi: this.link['dpsi'],
 			"copy link": function () { guiObj.copyUrl() }
@@ -61,21 +67,25 @@ class FourDGUI {
 			changeShape(shape)
 		});
 		const options = this.getShapeOptions(shapes, this.params['shape']);
-		options_ctrl = this.gui.add(this.params, 'option', options).onChange((option) => {
+		options_ctrl = this.gui.add(this.params, 'option').options(options).onChange((option) => {
 			setVisibility(option)
 		});
-		this.gui.add(this.params, 'hyperplane', 1.5, 2.25);
+		this.gui.add(this.params, 'hyperplane', 0.5, 1 / 0.8);
-		this.gui.add(this.params, 'thickness', 0.1, 2);
+		this.gui.add(this.params, 'zoom', 0.1, 2.0);
+		this.gui.add(this.params, 'nodesize', 0, 1);
+		this.gui.add(this.params, 'nodeopacity', 0, 1).onChange(setNodeOpacity);
+		this.gui.add(this.params, 'linksize', 0, 1);
 		this.gui.add(this.params, 'linkopacity', 0, 1).onChange(
 			(v) => setLinkOpacity(v, true)
 		);
 		this.gui.add(this.params, 'link2opacity', 0, 1).onChange(
 			(v) => setLinkOpacity(v, false)
 		);
-		this.gui.add(this.params, 'nodesize', 0.1, 4);
 		this.gui.addColor(this.params, 'color').onChange(setColor);
 		this.gui.addColor(this.params, 'background').onChange(setBackground);
-		this.gui.add(this.params, 'rotation', [ 'rigid', 'tumbling', 'inside-out', 'axisymmetrical' ]);
+		this.gui.add(this.params, 'xRotate', [ 'YW', 'YZ', 'ZW' ]);
+		this.gui.add(this.params, 'yRotate', [ 'XZ', 'XY', 'XW' ]);
+		this.gui.add(this.params, 'captions').onChange(showDocs);
 		this.gui.add(this.params, 'damping');
 		this.gui.add(this.params, 'copy link');
 
@@ -118,7 +128,7 @@ class FourDGUI {
 		const guiObj = this;
 
 		this.urlParams = this.linkUrl.searchParams;
-		for( const param of [ "shape", "rotation", "option" ]) {
+		for( const param of [ "shape", "xRotate", "yRotate", "option" ]) {
 			const value = this.urlParams.get(param);
 			if( value ) {
 				this.link[param] = value;
@@ -130,10 +140,12 @@ class FourDGUI {
 			this.link[param] = ( this.urlParams.get(param) === 'y' );
 		}
 		this.link['hyperplane'] = this.numParam('hyperplane', parseFloat);
-		this.link['thickness'] = this.numParam('thickness', parseFloat);
+		this.link['zoom'] = this.numParam('zoom', parseFloat);
+		this.link['linksize'] = this.numParam('linksize', parseFloat);
 		this.link['linkopacity'] = this.numParam('linkopacity', parseFloat);
 		this.link['link2opacity'] = this.numParam('link2opacity', parseFloat);
 		this.link['nodesize'] = this.numParam('nodesize', parseFloat);
+		this.link['nodeopacity'] = this.numParam('nodeopacity', parseFloat);
 		this.link['color'] = this.numParam('color', (s) => guiObj.stringToHex(s));
 		this.link['background'] = this.numParam('background', (s) => guiObj.stringToHex(s));
 		this.link['dpsi'] = this.numParam('dpsi', parseFloat);
@@ -147,14 +159,17 @@ class FourDGUI {
 		url.searchParams.append("option", this.params.option);
 		url.searchParams.append("inscribed", this.params.inscribed ? 'y': 'n');
 		url.searchParams.append("inscribe_all", this.params.inscribe_all ? 'y': 'n');
-		url.searchParams.append("thickness", this.params.thickness.toString());
+		url.searchParams.append("linksize", this.params.linksize.toString());
 		url.searchParams.append("nodesize", this.params.nodesize.toString());
-		url.searchParams.append("linkopacity", this.params.thickness.toString());
+		url.searchParams.append("nodeopacity", this.params.nodesize.toString());
-		url.searchParams.append("link2opacity", this.params.nodesize.toString());
+		url.searchParams.append("linkopacity", this.params.nodeopacity.toString());
+		url.searchParams.append("link2opacity", this.params.link2opacity.toString());
 		url.searchParams.append("color", this.hexToString(this.params.color));
 		url.searchParams.append("background", this.hexToString(this.params.background));
 		url.searchParams.append("hyperplane", this.params.hyperplane.toString());
-		url.searchParams.append("rotation", this.params.rotation);
+		url.searchParams.append("zoom", this.params.zoom.toString());
+		url.searchParams.append("xRotate", this.params.xRotate);
+		url.searchParams.append("yRotate", this.params.yRotate);
 		url.searchParams.append("dtheta", this.params.dtheta.toString());
 		url.searchParams.append("dpsi", this.params.dpsi.toString());
 		this.copyTextToClipboard(url);

index.html

@@ -5,6 +5,15 @@
 		<title>FourD</title>
 		<style>
 			body { margin: 0; }
+			div#description {
+				position: fixed;
+				top: 0;
+				left: 0;
+				width: 20%;
+				z-index: 2;
+				font-family: sans-serif;
+				padding: 1em;
+			}
 			div#info {
 				position: fixed;
 				bottom:0;
@@ -16,6 +25,7 @@
 	</head>
 	<body>
 		<script type="module" src="/main.js"></script>
+		<div id="description"></div>
 		<div id="info">by <a target="_blank" href="https://mikelynch.org/">Mike Lynch</a> -
 			<a target="_blank" href="https://git.tilde.town/bombinans/fourdjs">source</a></div>
 	</body>

layer600cell.js

@@ -0,0 +1,173 @@
+
+
+import * as POLYTOPES from './polytopes.js';
+
+// face detection for the 600-cell
+
+
+export function nodes_links(links, nodeid) {
+	return links.filter((l) => l.source === nodeid || l.target === nodeid);
+}
+
+
+export function linked(links, n1, n2) {
+	const ls = nodes_links(nodes_links(links, n1), n2);
+	if( ls.length ) {
+		return ls[0]
+	} else {
+		return false;
+	}
+}
+
+
+function fingerprint(ids) {
+	const sids = [...ids];
+	sids.sort();
+	return sids.join(',');
+}
+
+
+export function make_600cell() {
+	const nodes = POLYTOPES.make_600cell_vertices();
+	const links = POLYTOPES.auto_detect_edges(nodes, 12);
+	return {
+		nodes: nodes,
+		links: links
+	}
+}
+
+export function link_to_tetras(nodes, links, link) {
+	const n1 = link.source;
+	const n2 = link.target;
+	const nl1 = nodes_links(links, n1).filter((l) => l.id !== link.id);
+	const nl2 = nodes_links(links, n2).filter((l) => l.id !== link.id);
+	const p1 = new Set();
+	const p = new Set();
+	for( const nl of nl1 ) {
+		if( nl.source !== n1 ) {
+			p1.add(nl.source);
+		}
+		if( nl.target !== n1 ) {
+			p1.add(nl.target);
+		}
+	}
+	for( const nl of nl2 ) {
+		if( nl.source !== n2 && p1.has(nl.source) ) {
+			p.add(nl.source);
+		}
+		if( nl.target !== n2 && p1.has(nl.target) ) {
+			p.add(nl.target);
+		}
+	}
+	const lp = Array.from(p);
+	const seen = {};
+	const tetras = [];
+	for( const p1 of lp ) {
+		for( const p2 of lp ) {
+			if( p1 != p2 ) {
+				if( linked(links, p1, p2) ) {
+					const fp = fingerprint([n1, n2, p1, p2]);
+					if( !seen[fp] ) {
+						seen[fp] = true;
+						tetras.push({fingerprint: fp, nodes: [n1, n2, p1, p2]})
+					}
+				}
+			}
+		}
+	}
+	return tetras;
+}
+
+
+export function auto_600cell_cells(nodes, links) {
+	const seen = {};
+	const tetras = [];
+	links.map((link) => {
+		link_to_tetras(nodes, links, link).map((lt) => {
+			if( !seen[lt.fingerprint] ) {
+				seen[lt.fingerprint] = true;
+				tetras.push(lt.nodes);
+			}
+		})
+	});
+
+	return tetras;
+}
+
+
+function node_by_id(nodes, nid) {
+	const ns = nodes.filter((n) => n.id === nid);
+	return ns[0];
+}
+
+
+export function tetra_w(nodes, tetra) {
+	let w = 0;
+	for( const nid of tetra ) {
+		const node = node_by_id(nodes, nid);
+		w += node.w;
+	}
+	return w / 4;
+}
+
+export function sorted_600cells() {
+	const cell600 = make_600cell();
+	const tetras = auto_600cell_cells(cell600.nodes, cell600.links);
+	const layers = tetras.map((t) => { return { "nodes": t, w: tetra_w(cell600.nodes, t) } });
+	layers.sort((a, b) => b.w - a.w);
+	return layers;
+}
+
+// const cell600 = make_600cell();
+
+// const layers = sorted_600cells(cell600.nodes, cell600.links);
+// for( const cell of layers ) {
+// //	const fp = fingerprint(cell.nodes);
+// 	console.log(`${cell.w} ${cell.nodes}`);
+// }
+
+export function make_layered_600cell() {
+	const tetras = sorted_600cells()
+
+	const LAYERS = [
+		[ "00", 20 ],
+		[ "01", 20 ], 
+		[ "02", 30 ], 
+		[ "03", 60 ], 
+		[ "04", 60 ], 
+		[ "05", 60 ], 
+		[ "06", 20 ],
+		[ "07", 60 ], 
+		[ "08", 20 ],
+		[ "09", 60 ], 
+		[ "10", 60 ], 
+		[ "11", 60 ], 
+		[ "12", 30 ], 
+		[ "13", 20 ], 
+		[ "14", 20 ]
+	];
+
+	const vertices = {};
+	const seen = {};
+	let i = 0;
+
+	for( const layer of LAYERS ) {
+		const label = layer[0];
+		const n = layer[1];
+		vertices[label] = [];
+		console.log(`Layer ${label} starting at ${i}`);
+		for( const t of tetras.slice(i, i + n) ) {
+			console.log(t);
+			for( const n of t.nodes ) {
+				if( !seen[n] ) {
+					vertices[label].push(n);
+					seen[n] = true;
+				}
+			}
+		}
+		i += n;
+	}
+	return JSON.stringify(vertices);
+}
+
+

main.js

@@ -3,12 +3,13 @@ import * as THREE from 'three';
 
 
 import * as POLYTOPES from './polytopes.js';
-import { get_rotation } from './rotation.js';
+import { rotfn } from './rotation.js';
 import { FourDGUI, DEFAULTS } from './gui.js';
 import { FourDShape } from './fourDShape.js';
 import { get_colours } from './colours.js';
 
 const FACE_OPACITY = 0.3;
+const CAMERA_K = 5;
 
 // scene, lights and camera
 
@@ -23,7 +24,7 @@ scene.add(light);
 const amblight = new THREE.AmbientLight(0xffffff, 0.5);
 scene.add(amblight);
 
-camera.position.set(0, 0, 4);
+camera.position.set(0, 0, CAMERA_K / 2);
 
 camera.lookAt(0, 0, 0);
 //camera.position.z = 4;
@@ -46,11 +47,19 @@ material.opacity = 0.5;
 const node_ms = node_colours.map((c) => new THREE.MeshStandardMaterial({color: c}));
 const link_ms = node_colours.map((c) => new THREE.MeshStandardMaterial({color: c}));
 
+node_ms.map((m) => {
+	m.transparent =  true;
+	m.opacity = 1.0;
+	}
+);
+
 link_ms.map((m) => {
 	m.transparent =  true;
 	m.opacity = 0.5;
 	}
-)
+);
+
+
 
 const face_ms = [
 	new THREE.MeshLambertMaterial( { color: 0x44ff44 } )
@@ -84,6 +93,26 @@ function createShape(name, option) {
 	setVisibility(option ? option : structure.options[0].name);
 }
 
+function displayDocs(name) {
+	const docdiv = document.getElementById("description");
+	const description = STRUCTURES_BY_NAME[name].description;
+	if( description ) {
+		docdiv.innerHTML =`<p>${name}</p><p>${description}</p>`;
+	} else {
+		docdiv.innerHTML =`<p>${name}</p>`;
+	}
+}
+
+function showDocs(visible) {
+	console.log(`showDocs ${visible}`);
+	const docdiv = document.getElementById("description");
+	if( visible ) {
+		docdiv.style.display = '';
+	} else {
+		docdiv.style.display = 'none';
+	}
+}
+
 // initialise gui and read params from URL
 
 // callbacks to do things which are triggered by controls: reset the shape,
@@ -103,20 +132,28 @@ function setBackground(c) {
 }
 
 function setLinkOpacity(o, primary) {
-	if( primary ) {
+	if( structure.nolink2opacity ) {
-		link_ms[0].opacity = o;
+		link_ms.map((lm) => lm.opacity = o);
 	} else {
-		for( const lm of link_ms.slice(1) ) {
+		if( primary ) {
-			lm.opacity = o;
+			link_ms[0].opacity = o;
+		} else {
+			link_ms.slice(1).map((lm) => lm.opacity = o);
 		}
 	}
 }
 
-let gui; // 
+function setNodeOpacity(o) {
+	node_ms.map((nm) => nm.opacity = o);
+}
+
+
+let gui; 
 
 
 function changeShape() {
 	createShape(gui.params.shape);
+	displayDocs(gui.params.shape);
 }
 
 function setVisibility(option_name) {
@@ -130,14 +167,15 @@ function setVisibility(option_name) {
 }
 
 
-
 gui = new FourDGUI(
 	STRUCTURES,
 	changeShape,
 	setColors,
 	setBackground,
+	setNodeOpacity,
 	setLinkOpacity,
-	setVisibility
+	setVisibility,
+	showDocs
 );
 
 // these are here to pick up colour settings from the URL params
@@ -182,6 +220,7 @@ renderer.domElement.addEventListener("pointerup", (event) => {
 })
 
 createShape(gui.params.shape, gui.params.option);
+displayDocs(gui.params.shape);
 
 function animate() {
 	requestAnimationFrame( animate );
@@ -195,13 +234,19 @@ function animate() {
 		}
 	}
 
-	const rotations = get_rotation(gui.params.rotation, theta, psi);
+	const rotations = [
+		rotfn[gui.params.xRotate](theta), 
+		rotfn[gui.params.yRotate](psi)
+	];
+	shape.hyperplane = 1 / gui.params.hyperplane;
+	camera.position.set(0, 0, gui.params.zoom * CAMERA_K * gui.params.hyperplane);
 
-	shape.hyperplane = gui.params.hyperplane;
-	shape.link_scale = gui.params.thickness;
 	shape.node_scale = gui.params.nodesize;
+	shape.link_scale = gui.params.linksize * gui.params.nodesize * 0.5;
 	shape.render3(rotations, node_show, link_show);
 
+
+
 	renderer.render( scene, camera );
 }
 animate();

package-lock.json

@@ -4,9 +4,11 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "fourdjs",
       "dependencies": {
+        "color": "^4.2.3",
         "color-scheme": "^1.0.1",
-        "lil-gui": "^0.18.2",
+        "lil-gui": "^0.19.0",
         "three": "^0.154.0"
       },
       "devDependencies": {
@@ -14,9 +16,9 @@
       }
     },
     "node_modules/@esbuild/android-arm": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.18.20.tgz",
-      "integrity": "sha512-wlkQBWb79/jeEEoRmrxt/yhn5T1lU236OCNpnfRzaCJHZ/5gf82uYx1qmADTBWE0AR/v7FiozE1auk2riyQd3w==",
+      "integrity": "sha512-fyi7TDI/ijKKNZTUJAQqiG5T7YjJXgnzkURqmGj13C6dCqckZBLdl4h7bkhHt/t0WP+zO9/zwroDvANaOqO5Sw==",
       "cpu": [
         "arm"
       ],
@@ -30,9 +32,9 @@
       }
     },
     "node_modules/@esbuild/android-arm64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.18.20.tgz",
-      "integrity": "sha512-NI/gnWcMl2kXt1HJKOn2H69SYn4YNheKo6NZt1hyfKWdMbaGadxjZIkcj4Gjk/WPxnbFXs9/3HjGHaknCqjrww==",
+      "integrity": "sha512-Nz4rJcchGDtENV0eMKUNa6L12zz2zBDXuhj/Vjh18zGqB44Bi7MBMSXjgunJgjRhCmKOjnPuZp4Mb6OKqtMHLQ==",
       "cpu": [
         "arm64"
       ],
@@ -46,9 +48,9 @@
       }
     },
     "node_modules/@esbuild/android-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.18.20.tgz",
-      "integrity": "sha512-FM9NQamSaEm/IZIhegF76aiLnng1kEsZl2eve/emxDeReVfRuRNmvT28l6hoFD9TsCxpK+i4v8LPpEj74T7yjA==",
+      "integrity": "sha512-8GDdlePJA8D6zlZYJV/jnrRAi6rOiNaCC/JclcXpB+KIuvfBN4owLtgzY2bsxnx666XjJx2kDPUmnTtR8qKQUg==",
       "cpu": [
         "x64"
       ],
@@ -62,9 +64,9 @@
       }
     },
     "node_modules/@esbuild/darwin-arm64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.18.20.tgz",
-      "integrity": "sha512-XmrFwEOYauKte9QjS6hz60FpOCnw4zaPAb7XV7O4lx1r39XjJhTN7ZpXqJh4sN6q60zbP6QwAVVA8N/wUyBH/w==",
+      "integrity": "sha512-bxRHW5kHU38zS2lPTPOyuyTm+S+eobPUnTNkdJEfAddYgEcll4xkT8DB9d2008DtTbl7uJag2HuE5NZAZgnNEA==",
       "cpu": [
         "arm64"
       ],
@@ -78,9 +80,9 @@
       }
     },
     "node_modules/@esbuild/darwin-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.18.20.tgz",
-      "integrity": "sha512-bMqBmpw1e//7Fh5GLetSZaeo9zSC4/CMtrVFdj+bqKPGJuKyfNJ5Nf2m3LknKZTS+Q4oyPiON+v3eaJ59sLB5A==",
+      "integrity": "sha512-pc5gxlMDxzm513qPGbCbDukOdsGtKhfxD1zJKXjCCcU7ju50O7MeAZ8c4krSJcOIJGFR+qx21yMMVYwiQvyTyQ==",
       "cpu": [
         "x64"
       ],
@@ -94,9 +96,9 @@
       }
     },
     "node_modules/@esbuild/freebsd-arm64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.18.20.tgz",
-      "integrity": "sha512-LoTK5N3bOmNI9zVLCeTgnk5Rk0WdUTrr9dyDAQGVMrNTh9EAPuNwSTCgaKOKiDpverOa0htPcO9NwslSE5xuLA==",
+      "integrity": "sha512-yqDQHy4QHevpMAaxhhIwYPMv1NECwOvIpGCZkECn8w2WFHXjEwrBn3CeNIYsibZ/iZEUemj++M26W3cNR5h+Tw==",
       "cpu": [
         "arm64"
       ],
@@ -110,9 +112,9 @@
       }
     },
     "node_modules/@esbuild/freebsd-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.18.20.tgz",
-      "integrity": "sha512-62jX5n30VzgrjAjOk5orYeHFq6sqjvsIj1QesXvn5OZtdt5Gdj0vUNJy9NIpjfdNdqr76jjtzBJKf+h2uzYuTQ==",
+      "integrity": "sha512-tgWRPPuQsd3RmBZwarGVHZQvtzfEBOreNuxEMKFcd5DaDn2PbBxfwLcj4+aenoh7ctXcbXmOQIn8HI6mCSw5MQ==",
       "cpu": [
         "x64"
       ],
@@ -126,9 +128,9 @@
       }
     },
     "node_modules/@esbuild/linux-arm": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.18.20.tgz",
-      "integrity": "sha512-dT4URUv6ir45ZkBqhwZwyFV6cH61k8MttIwhThp2BGiVtagYvCToF+Bggyx2VI57RG4Fbt21f9TmXaYx0DeUJg==",
+      "integrity": "sha512-/5bHkMWnq1EgKr1V+Ybz3s1hWXok7mDFUMQ4cG10AfW3wL02PSZi5kFpYKrptDsgb2WAJIvRcDm+qIvXf/apvg==",
       "cpu": [
         "arm"
       ],
@@ -142,9 +144,9 @@
       }
     },
     "node_modules/@esbuild/linux-arm64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.18.20.tgz",
-      "integrity": "sha512-BWncQeuWDgYv0jTNzJjaNgleduV4tMbQjmk/zpPh/lUdMcNEAxy+jvneDJ6RJkrqloG7tB9S9rCrtfk/kuplsQ==",
+      "integrity": "sha512-2YbscF+UL7SQAVIpnWvYwM+3LskyDmPhe31pE7/aoTMFKKzIc9lLbyGUpmmb8a8AixOL61sQ/mFh3jEjHYFvdA==",
       "cpu": [
         "arm64"
       ],
@@ -158,9 +160,9 @@
       }
     },
     "node_modules/@esbuild/linux-ia32": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.18.20.tgz",
-      "integrity": "sha512-JPXORvgHRHITqfms1dWT/GbEY89u848dC08o0yK3fNskhp0t2TuNUnsrrSgOdH28ceb1hJuwyr8R/1RnyPwocw==",
+      "integrity": "sha512-P4etWwq6IsReT0E1KHU40bOnzMHoH73aXp96Fs8TIT6z9Hu8G6+0SHSw9i2isWrD2nbx2qo5yUqACgdfVGx7TA==",
       "cpu": [
         "ia32"
       ],
@@ -174,9 +176,9 @@
       }
     },
     "node_modules/@esbuild/linux-loong64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.18.20.tgz",
-      "integrity": "sha512-kArPI0DopjJCEplsVj/H+2Qgzz7vdFSacHNsgoAKpPS6W/Ndh8Oe24HRDQ5QCu4jHgN6XOtfFfLpRx3TXv/mEg==",
+      "integrity": "sha512-nXW8nqBTrOpDLPgPY9uV+/1DjxoQ7DoB2N8eocyq8I9XuqJ7BiAMDMf9n1xZM9TgW0J8zrquIb/A7s3BJv7rjg==",
       "cpu": [
         "loong64"
       ],
@@ -190,9 +192,9 @@
       }
     },
     "node_modules/@esbuild/linux-mips64el": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.18.20.tgz",
-      "integrity": "sha512-b/tmngUfO02E00c1XnNTw/0DmloKjb6XQeqxaYuzGwHe0fHVgx5/D6CWi+XH1DvkszjBUkK9BX7n1ARTOst59w==",
+      "integrity": "sha512-d5NeaXZcHp8PzYy5VnXV3VSd2D328Zb+9dEq5HE6bw6+N86JVPExrA6O68OPwobntbNJ0pzCpUFZTo3w0GyetQ==",
       "cpu": [
         "mips64el"
       ],
@@ -206,9 +208,9 @@
       }
     },
     "node_modules/@esbuild/linux-ppc64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.18.20.tgz",
-      "integrity": "sha512-KXPY69MWw79QJkyvUYb2ex/OgnN/8N/Aw5UDPlgoRtoEfcBqfeLodPr42UojV3NdkoO4u10NXQdamWm1YEzSKw==",
+      "integrity": "sha512-WHPyeScRNcmANnLQkq6AfyXRFr5D6N2sKgkFo2FqguP44Nw2eyDlbTdZwd9GYk98DZG9QItIiTlFLHJHjxP3FA==",
       "cpu": [
         "ppc64"
       ],
@@ -222,9 +224,9 @@
       }
     },
     "node_modules/@esbuild/linux-riscv64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.18.20.tgz",
-      "integrity": "sha512-komK3NEAeeGRnvFEjX1SfVg6EmkfIi5aKzevdvJqMydYr9N+pRQK0PGJXk+bhoPZwOUgLO4l99FZmLGk/L1jWg==",
+      "integrity": "sha512-WSxo6h5ecI5XH34KC7w5veNnKkju3zBRLEQNY7mv5mtBmrP/MjNBCAlsM2u5hDBlS3NGcTQpoBvRzqBcRtpq1A==",
       "cpu": [
         "riscv64"
       ],
@@ -238,9 +240,9 @@
       }
     },
     "node_modules/@esbuild/linux-s390x": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.18.20.tgz",
-      "integrity": "sha512-632T5Ts6gQ2WiMLWRRyeflPAm44u2E/s/TJvn+BP6M5mnHSk93cieaypj3VSMYO2ePTCRqAFXtuYi1yv8uZJNA==",
+      "integrity": "sha512-+8231GMs3mAEth6Ja1iK0a1sQ3ohfcpzpRLH8uuc5/KVDFneH6jtAJLFGafpzpMRO6DzJ6AvXKze9LfFMrIHVQ==",
       "cpu": [
         "s390x"
       ],
@@ -254,9 +256,9 @@
       }
     },
     "node_modules/@esbuild/linux-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.18.20.tgz",
-      "integrity": "sha512-MsHtX0NgvRHsoOtYkuxyk4Vkmvk3PLRWfA4okK7c+6dT0Fu4SUqXAr9y4Q3d8vUf1VWWb6YutpL4XNe400iQ1g==",
+      "integrity": "sha512-UYqiqemphJcNsFEskc73jQ7B9jgwjWrSayxawS6UVFZGWrAAtkzjxSqnoclCXxWtfwLdzU+vTpcNYhpn43uP1w==",
       "cpu": [
         "x64"
       ],
@@ -270,9 +272,9 @@
       }
     },
     "node_modules/@esbuild/netbsd-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.18.20.tgz",
-      "integrity": "sha512-djST6s+jQiwxMIVQ5rlt24JFIAr4uwUnzceuFL7BQT4CbrRtqBPueS4GjXSiIpmwVri1Icj/9pFRJ7/aScvT+A==",
+      "integrity": "sha512-iO1c++VP6xUBUmltHZoMtCUdPlnPGdBom6IrO4gyKPFFVBKioIImVooR5I83nTew5UOYrk3gIJhbZh8X44y06A==",
       "cpu": [
         "x64"
       ],
@@ -286,9 +288,9 @@
       }
     },
     "node_modules/@esbuild/openbsd-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.18.20.tgz",
-      "integrity": "sha512-naeRhUIvhsgeounjkF5mvrNAVMGAm6EJWiabskeE5yOeBbLp7T89tAEw0j5Jm/CZAwyLe3c67zyCWH6fsBLCpw==",
+      "integrity": "sha512-e5e4YSsuQfX4cxcygw/UCPIEP6wbIL+se3sxPdCiMbFLBWu0eiZOJ7WoD+ptCLrmjZBK1Wk7I6D/I3NglUGOxg==",
       "cpu": [
         "x64"
       ],
@@ -302,9 +304,9 @@
       }
     },
     "node_modules/@esbuild/sunos-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.18.20.tgz",
-      "integrity": "sha512-qkT2+WxyKbNIKV1AEhI8QiSIgTHMcRctzSaa/I3kVgMS5dl3fOeoqkb7pW76KwxHoriImhx7Mg3TwN/auMDsyQ==",
+      "integrity": "sha512-kDbFRFp0YpTQVVrqUd5FTYmWo45zGaXe0X8E1G/LKFC0v8x0vWrhOWSLITcCn63lmZIxfOMXtCfti/RxN/0wnQ==",
       "cpu": [
         "x64"
       ],
@@ -318,9 +320,9 @@
       }
     },
     "node_modules/@esbuild/win32-arm64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.18.20.tgz",
-      "integrity": "sha512-HC4/feP+pB2Vb+cMPUjAnFyERs+HJN7E6KaeBlFdBv799MhD+aPJlfi/yk36SED58J9TPwI8MAcVpJgej4ud0A==",
+      "integrity": "sha512-ddYFR6ItYgoaq4v4JmQQaAI5s7npztfV4Ag6NrhiaW0RrnOXqBkgwZLofVTlq1daVTQNhtI5oieTvkRPfZrePg==",
       "cpu": [
         "arm64"
       ],
@@ -334,9 +336,9 @@
       }
     },
     "node_modules/@esbuild/win32-ia32": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.18.20.tgz",
-      "integrity": "sha512-ovjwoRXI+gf52EVF60u9sSDj7myPixPxqzD5CmkEUmvs+W9Xd0iqISVBQn8xcx4ciIaIVlWCuTbYDOXOnOL44Q==",
+      "integrity": "sha512-Wv7QBi3ID/rROT08SABTS7eV4hX26sVduqDOTe1MvGMjNd3EjOz4b7zeexIR62GTIEKrfJXKL9LFxTYgkyeu7g==",
       "cpu": [
         "ia32"
       ],
@@ -350,9 +352,9 @@
       }
     },
     "node_modules/@esbuild/win32-x64": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.18.20.tgz",
-      "integrity": "sha512-imUxH9a3WJARyAvrG7srLyiK73XdX83NXQkjKvQ+7vPh3ZxoLrzvPkQKKw2DwZ+RV2ZB6vBfNHP8XScAmQC3aA==",
+      "integrity": "sha512-kTdfRcSiDfQca/y9QIkng02avJ+NCaQvrMejlsB3RRv5sE9rRoeBPISaZpKxHELzRxZyLvNts1P27W3wV+8geQ==",
       "cpu": [
         "x64"
       ],
@@ -365,15 +367,52 @@
         "node": ">=12"
       }
     },
+    "node_modules/color": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/color/-/color-4.2.3.tgz",
+      "integrity": "sha512-1rXeuUUiGGrykh+CeBdu5Ie7OJwinCgQY0bc7GCRxy5xVHy+moaqkpL/jqQq0MtQOeYcrqEz4abc5f0KtU7W4A==",
+      "dependencies": {
+        "color-convert": "^2.0.1",
+        "color-string": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=12.5.0"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+    },
     "node_modules/color-scheme": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/color-scheme/-/color-scheme-1.0.1.tgz",
       "integrity": "sha512-4x+ya6+z6g9DaTFSfVzTZc8TSjxHuDT40NB43N3XPUkQlF6uujhwH8aeMeq8HBgoQQog/vrYgJ16mt/eVTRXwQ=="
     },
+    "node_modules/color-string": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.9.1.tgz",
+      "integrity": "sha512-shrVawQFojnZv6xM40anx4CkoDP+fZsw/ZerEMsW/pyzsRbElpsL/DBVW7q3ExxwusdNXI3lXpuhEZkzs8p5Eg==",
+      "dependencies": {
+        "color-name": "^1.0.0",
+        "simple-swizzle": "^0.2.2"
+      }
+    },
     "node_modules/esbuild": {
-      "version": "0.18.15",
+      "version": "0.18.20",
-      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.18.15.tgz",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.18.20.tgz",
-      "integrity": "sha512-3WOOLhrvuTGPRzQPU6waSDWrDTnQriia72McWcn6UCi43GhCHrXH4S59hKMeez+IITmdUuUyvbU9JIp+t3xlPQ==",
+      "integrity": "sha512-ceqxoedUrcayh7Y7ZX6NdbbDzGROiyVBgC4PriJThBKSVPWnnFHZAkfI1lJT8QFkOwH4qOS2SJkS4wvpGl8BpA==",
       "dev": true,
       "hasInstallScript": true,
       "bin": {
@@ -383,34 +422,34 @@
         "node": ">=12"
       },
       "optionalDependencies": {
-        "@esbuild/android-arm": "0.18.15",
+        "@esbuild/android-arm": "0.18.20",
-        "@esbuild/android-arm64": "0.18.15",
+        "@esbuild/android-arm64": "0.18.20",
-        "@esbuild/android-x64": "0.18.15",
+        "@esbuild/android-x64": "0.18.20",
-        "@esbuild/darwin-arm64": "0.18.15",
+        "@esbuild/darwin-arm64": "0.18.20",
-        "@esbuild/darwin-x64": "0.18.15",
+        "@esbuild/darwin-x64": "0.18.20",
-        "@esbuild/freebsd-arm64": "0.18.15",
+        "@esbuild/freebsd-arm64": "0.18.20",
-        "@esbuild/freebsd-x64": "0.18.15",
+        "@esbuild/freebsd-x64": "0.18.20",
-        "@esbuild/linux-arm": "0.18.15",
+        "@esbuild/linux-arm": "0.18.20",
-        "@esbuild/linux-arm64": "0.18.15",
+        "@esbuild/linux-arm64": "0.18.20",
-        "@esbuild/linux-ia32": "0.18.15",
+        "@esbuild/linux-ia32": "0.18.20",
-        "@esbuild/linux-loong64": "0.18.15",
+        "@esbuild/linux-loong64": "0.18.20",
-        "@esbuild/linux-mips64el": "0.18.15",
+        "@esbuild/linux-mips64el": "0.18.20",
-        "@esbuild/linux-ppc64": "0.18.15",
+        "@esbuild/linux-ppc64": "0.18.20",
-        "@esbuild/linux-riscv64": "0.18.15",
+        "@esbuild/linux-riscv64": "0.18.20",
-        "@esbuild/linux-s390x": "0.18.15",
+        "@esbuild/linux-s390x": "0.18.20",
-        "@esbuild/linux-x64": "0.18.15",
+        "@esbuild/linux-x64": "0.18.20",
-        "@esbuild/netbsd-x64": "0.18.15",
+        "@esbuild/netbsd-x64": "0.18.20",
-        "@esbuild/openbsd-x64": "0.18.15",
+        "@esbuild/openbsd-x64": "0.18.20",
-        "@esbuild/sunos-x64": "0.18.15",
+        "@esbuild/sunos-x64": "0.18.20",
-        "@esbuild/win32-arm64": "0.18.15",
+        "@esbuild/win32-arm64": "0.18.20",
-        "@esbuild/win32-ia32": "0.18.15",
+        "@esbuild/win32-ia32": "0.18.20",
-        "@esbuild/win32-x64": "0.18.15"
+        "@esbuild/win32-x64": "0.18.20"
       }
     },
     "node_modules/fsevents": {
-      "version": "2.3.2",
+      "version": "2.3.3",
-      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
-      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
       "dev": true,
       "hasInstallScript": true,
       "optional": true,
@@ -421,10 +460,15 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/is-arrayish": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+      "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ=="
+    },
     "node_modules/lil-gui": {
-      "version": "0.18.2",
+      "version": "0.19.0",
-      "resolved": "https://registry.npmjs.org/lil-gui/-/lil-gui-0.18.2.tgz",
+      "resolved": "https://registry.npmjs.org/lil-gui/-/lil-gui-0.19.0.tgz",
-      "integrity": "sha512-DgdrLy3/KGC0PiQLKgOcJMPItP4xY4iWgJ9+91Zaxfr8GCTmMps05QS9w9jW7yspILlbscbquwjOwxmWnSx5Uw=="
+      "integrity": "sha512-02/Z7rPng3GXWFwkQVj1hQaJYo2fIEYctqe0ima5uI/N2HEagB9ZGCQKkVWr3UuKfTr0arto3Q9prTB8sxtJJw=="
     },
     "node_modules/nanoid": {
       "version": "3.3.6",
@@ -451,9 +495,9 @@
       "dev": true
     },
     "node_modules/postcss": {
-      "version": "8.4.27",
+      "version": "8.4.31",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.27.tgz",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
-      "integrity": "sha512-gY/ACJtJPSmUFPDCHtX78+01fHa64FaU4zaaWfuh1MhGJISufJAH4cun6k/8fwsHYeK4UQmENQK+tRLCFJE8JQ==",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "dev": true,
       "funding": [
         {
@@ -479,9 +523,9 @@
       }
     },
     "node_modules/rollup": {
-      "version": "3.26.3",
+      "version": "3.29.4",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-3.26.3.tgz",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-3.29.4.tgz",
-      "integrity": "sha512-7Tin0C8l86TkpcMtXvQu6saWH93nhG3dGQ1/+l5V2TDMceTxO7kDiK6GzbfLWNNxqJXm591PcEZUozZm51ogwQ==",
+      "integrity": "sha512-oWzmBZwvYrU0iJHtDmhsm662rC15FRXmcjCk1xD771dFDx5jJ02ufAQQTn0etB2emNk4J9EZg/yWKpsn9BWGRw==",
       "dev": true,
       "bin": {
         "rollup": "dist/bin/rollup"
@@ -494,6 +538,14 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha512-JA//kQgZtbuY83m+xT+tXJkmJncGMTFT+C+g2h2R9uxkYIrE2yy9sgmcLhCnw57/WSD+Eh3J97FPEDFnbXnDUg==",
+      "dependencies": {
+        "is-arrayish": "^0.3.1"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.2.tgz",
@@ -509,14 +561,14 @@
       "integrity": "sha512-Uzz8C/5GesJzv8i+Y2prEMYUwodwZySPcNhuJUdsVMH2Yn4Nm8qlbQe6qRN5fOhg55XB0WiLfTPBxVHxpE60ug=="
     },
     "node_modules/vite": {
-      "version": "4.4.6",
+      "version": "4.5.3",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-4.4.6.tgz",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-4.5.3.tgz",
-      "integrity": "sha512-EY6Mm8vJ++S3D4tNAckaZfw3JwG3wa794Vt70M6cNJ6NxT87yhq7EC8Rcap3ahyHdo8AhCmV9PTk+vG1HiYn1A==",
+      "integrity": "sha512-kQL23kMeX92v3ph7IauVkXkikdDRsYMGTVl5KY2E9OY4ONLvkHf04MDTbnfo6NKxZiDLWzVpP5oTa8hQD8U3dg==",
       "dev": true,
       "dependencies": {
         "esbuild": "^0.18.10",
-        "postcss": "^8.4.26",
+        "postcss": "^8.4.27",
-        "rollup": "^3.25.2"
+        "rollup": "^3.27.1"
       },
       "bin": {
         "vite": "bin/vite.js"

package.json

@@ -1,7 +1,8 @@
 {
   "dependencies": {
+    "color": "^4.2.3",
     "color-scheme": "^1.0.1",
-    "lil-gui": "^0.18.2",
+    "lil-gui": "^0.19.0",
     "three": "^0.154.0"
   },
   "devDependencies": {

polytopes.js

@@ -1,6 +1,6 @@
 import * as PERMUTE from './permute.js';
 
-import * as CELL120 from './cellindex.js';
+import * as CELLINDEX from './cellindex.js';
 
 function index_nodes(nodes, scale) {
 	let i = 1;
@@ -22,7 +22,7 @@ function dist2(n1, n2) {
 	return (n1.x - n2.x) ** 2 + (n1.y - n2.y) ** 2 + (n1.z - n2.z) ** 2 + (n1.w - n2.w) ** 2;
 }
 
-function auto_detect_edges(nodes, neighbours, debug=false) {
+export function auto_detect_edges(nodes, neighbours, debug=false) {
 	const seen = {};
 	const nnodes = nodes.length;
 	const links = [];
@@ -58,16 +58,15 @@ function auto_detect_edges(nodes, neighbours, debug=false) {
 // too small and simple to calculate
 
 export const cell5 = () => {
-	const r5 = Math.sqrt(5);
+	const c1 = Math.sqrt(5) / 4;
-	const r2 = Math.sqrt(2) / 2;
 	return {
 		name: '5-cell',
 		nodes: [
-	      {id:1, label: 1, x: r2, y: r2, z: r2, w: -r2 / r5 },
+	      {id:1, label: 1, x: c1, y: c1, z: c1, w: -0.25 },
-	      {id:2, label: 2, x: r2, y: -r2, z: -r2, w: -r2 / r5 },
+	      {id:2, label: 2, x: c1, y: -c1, z: -c1, w: -0.25 },
-	      {id:3, label: 3, x: -r2, y: r2, z: -r2, w: -r2 / r5 },
+	      {id:3, label: 3, x: -c1, y: c1, z: -c1, w: -0.25 },
-	      {id:4, label: 4, x: -r2, y: -r2, z: r2, w: -r2 / r5 },
+	      {id:4, label: 4, x: -c1, y: -c1, z: c1, w: -0.25 },
-	      {id:5, label: 5, x: 0, y: 0, z: 0, w: 4 * r2 / r5 },
+	      {id:5, label: 5, x: 0, y: 0, z: 0, w: 1 },
 		],
 		links: [
 			{ id:1, source:1, target: 2},
@@ -81,11 +80,12 @@ export const cell5 = () => {
 			{ id:9, source:3, target: 5},
 			{ id:10, source:4, target: 5},
 		],
-		geometry: {
+		options: [ { name: '--' }],
-			node_size: 0.02,
+		description: `Five tetrahedra joined at ten faces with three
-			link_size: 0.02
+		tetrahedra around each edge. The 5-cell is the simplest regular
-		},
+		four-D polytope and the four-dimensional analogue of the tetrahedron.
-		options: [ { name: '--' }]
+		A corresponding polytope, or simplex, exists for every n-dimensional
+		space.`,
 	};
 };
 
@@ -104,18 +104,18 @@ export const cell16 = () => {
 	nodes[1].label = 4;
 
 	index_nodes(nodes);
-	scale_nodes(nodes, 0.75);
+	scale_nodes(nodes, 0.5);
 	const links = auto_detect_edges(nodes, 6);
 
 	return {
 		name: '16-cell',
 		nodes: nodes,
 		links: links,
-		geometry: {
+		options: [ { name: '--' }],
-			node_size: 0.02,
+		description: `Sixteen tetrahedra joined at 32 faces with four
-			link_size: 0.02
+		tetrahedra around each edge. The 16-cell is the four-dimensional
-		},
+		analogue of the octahedron and is dual to the tesseract. Every
-		options: [ { name: '--' }]
+		n-dimensional space has a corresponding polytope in this family.`,
 	};
 };
 
@@ -133,7 +133,7 @@ export const tesseract = () => {
 		}
 	}
 
-	scale_nodes(nodes, Math.sqrt(2) / 2);
+	scale_nodes(nodes, 0.5);
 	const links = auto_detect_edges(nodes, 4);
 	links.map((l) => { l.label = 0 });
 
@@ -146,18 +146,20 @@ export const tesseract = () => {
 
 
 	return {
-		name: 'tesseract',
+		name: 'Tesseract',
 		nodes: nodes,
 		links: links,
-		geometry: {
-			node_size: 0.02,
-			link_size: 0.02
-		},
 		options: [
 			{ name: 'none', links: [ 0 ] },
 			{ name: 'one 16-cell', links: [ 0, 1 ] },
 			{ name: 'both 16-cells', links: [ 0, 1, 2 ] },
 		],
+		description: `The most well-known four-dimensional shape, the
+		tesseract is analogous to the cube, and is constructed by placing two
+		cubes in parallel hyperplanes and joining their corresponding
+		vertices. It consists of eight cubes joined at 32 face with three 
+		cubes around each edge, and is dual to the 16-cell. Every
+		n-dimensional space has a cube analogue or measure polytope.`,
 	};
 }
 
@@ -183,6 +185,7 @@ export const cell24 = () => {
 		n.label = CELL24_INDEXING[axes[0]][axes[1]];
 	}
 
+	scale_nodes(nodes, Math.sqrt(2) / 2);
 	index_nodes(nodes);
 	const links = auto_detect_edges(nodes, 8);
 	links.map((l) => l.label = 0);
@@ -206,16 +209,16 @@ export const cell24 = () => {
 		name: '24-cell',
 		nodes: nodes,
 		links: links,
-		geometry: {
-			node_size: 0.02,
-			link_size: 0.02
-		},
 		base: {},
 		options: [
 			{ name: 'none', links: [ 0 ] },
 			{ name: 'one 16-cell', links: [ 0, 1 ] },
 			{ name: 'three 16-cells', links: [ 0, 1, 2, 3 ] }
-		]
+		],
+		description: `A unique object without an exact analogue in higher
+		or lower dimensions, the 24-cell is made of twenty-four octahedra
+		joined at 96 faces, with three around each edge. The 24-cell is
+		self-dual.`,
 	};
 }
 
@@ -301,7 +304,7 @@ function auto_120cell_faces(links) {
 
 
 
-function make_120cell_vertices() {
+export function make_120cell_vertices() {
 	const phi = 0.5 * (1 + Math.sqrt(5));  
 	const r5 = Math.sqrt(5);   
 	const phi2 = phi * phi;    
@@ -319,7 +322,7 @@ function make_120cell_vertices() {
 		PERMUTE.coordinates([2, 1, phi, phiinv], 0, true),
 		].flat();
 	index_nodes(nodes);
-	scale_nodes(nodes, 0.5);
+	scale_nodes(nodes, 0.25 * Math.sqrt(2));
 	return nodes;
 }
 
@@ -364,8 +367,8 @@ export const cell120_layered = (max) => {
 
 	nodes.map((n) => n.label = 9); // make all invisible by default
 
-	for (const cstr in CELL120.LAYERS ) {
+	for (const cstr in CELLINDEX.LAYERS120 ) {
-		label_nodes(nodes, CELL120.LAYERS[cstr], Number(cstr));
+		label_nodes(nodes, CELLINDEX.LAYERS120[cstr], Number(cstr));
 	}
 
 	links.map((l) => {
@@ -382,8 +385,8 @@ export const cell120_layered = (max) => {
 
 	for( const i of [ 0, 1, 2, 3, 4, 5, 6, 7 ] ) {
 		layers.push(i);
-		options.unshift({
+		options.push({
-			name: "Layer " + String(i),
+			name: CELLINDEX.LAYER_NAMES[i],
 			links: [...layers],
 			nodes: [...layers]
 		})
@@ -393,11 +396,10 @@ export const cell120_layered = (max) => {
 		name: '120-cell layered',
 		nodes: nodes,
 		links: links,
-		geometry: {
+		nolink2opacity: true,
-			node_size: 0.02,
+		options: options,
-			link_size: 0.02
+		description: `This version of the 120-cell lets you explore its
-		},
+		structure by building each layer from the 'north pole' onwards.`,
-		options: options
 	}
 }
 
@@ -408,8 +410,8 @@ export const cell120_inscribed = () => {
 	const nodes  = make_120cell_vertices();
 	const links = auto_detect_edges(nodes, 4);
 
-  	for( const cstr in CELL120.INDEX ) {
+  	for( const cstr in CELLINDEX.INDEX120 ) {
-		label_nodes(nodes, CELL120.INDEX[cstr], Number(cstr));
+		label_nodes(nodes, CELLINDEX.INDEX120[cstr], Number(cstr));
 	}
 
 	links.map((l) => l.label = 0);
@@ -425,90 +427,20 @@ export const cell120_inscribed = () => {
 		name: '120-cell',
 		nodes: nodes,
 		links: links,
-		geometry: {
-			node_size: 0.02,
-			link_size: 0.02
-		},
 		options: [
 			{ name: "none", links: [ 0 ]},
 			{ name: "one inscribed 600-cell", links: [ 0, 1 ] },
 			{ name: "five inscribed 600-cells", links: [ 0, 1, 2, 3, 4, 5 ] }
-		]
+		],
+		description: `The 120-cell is the four-dimensional analogue of the
+		dodecahedron, and consists of 120 dodecahedra joined at 720 faces,
+		with three dodecahedra around each edge. It is dual to the 600-cell,
+		and five 600-cells can be inscribed in its vertices.`,
 	}
 }
 
 
 
-// Schoute's partition via https://arxiv.org/abs/1010.4353
-
-const partition600 = {
-
-	"2,0,0,0": 1,
-	"0,2,0,0": 1,
-	"0,0,2,0": 1,
-	"0,0,0,2": 1,
-	"1,1,1,1": 1,
-	"1,1,-1,-1": 1,
-	"1,-1,1,-1": 1,
-	"1,-1,-1,1": 1,
-	"1,-1,-1,-1": 1,
-	"1,-1,1,1": 1,
-	"1,1,-1,1": 1,
-	"1,1,1,-1": 1,
-
-	"k,0,-t,-1": 2,
-	"0,k,1,-t": 2,
-	"t,-1,k,0": 2,
-	"1,t,0,k": 2,
-	"t,k,0,-1": 2,
-	"1,0,k,t": 2,
-	"k,-t,-1,0": 2,
-	"0,1,-t,k": 2,
-	"1,k,t,0": 2,
-	"t,0,-1,k": 2,
-	"0,t,-k,-1": 2,
-	"k,-1,0,-t": 2,
-
-	"t,0,1,k": 3,
-	"0,t,-k,1": 3,
-	"1,-k,-t,0": 3,
-	"k,1,0,-t": 3,
-	"0,k,1,t": 3,
-	"t,1,-k,0": 3,
-	"k,0,t,-1": 3,
-	"1,-t,0,k": 3,
-	"t,-k,0,-1": 3,
-	"0,1,-t,-k": 3,
-	"1,0,-k,t": 3,
-	"k,t,1,0": 3,
-
-	"t,0,-1,-k": 4,
-	"0,t,k,-1": 4,
-	"1,-k,t,0": 4,
-	"k,1,0,t": 4,
-	"t,1,k,0": 4,
-	"0,k,-1,-t": 4,
-	"1,-t,0,-k": 4,
-	"k,0,-t,1": 4,
-	"0,1,t,k": 4,
-	"t,-k,0,1": 4,
-	"k,t,-1,0": 4,
-	"1,0,k,-t": 4,
-
-	"k,0,t,1": 5,
-	"0,k,-1,t": 5,
-	"t,-1,-k,0": 5,
-	"1,t,0,-k": 5,
-	"1,0,-k,-t": 5,
-	"t,k,0,1": 5,
-	"0,1,t,-k": 5,
-	"k,-t,1,0": 5,
-	"t,0,1,-k": 5,
-	"1,k,-t,0": 5,
-	"k,-1,0,t": 5,
-	"0,t,k,1": 5
-};
-
 
 
 function partition_coord(i, coords, invert) {
@@ -549,7 +481,7 @@ function map_coord(i, coords, values) {
 }
 
 
-function make_600cell_vertices() {
+export function make_600cell_vertices() {
 	const coords = {
 		0: '0',
 		1: '1',
@@ -573,7 +505,7 @@ function make_600cell_vertices() {
 	].flat();
 
 	for( const n of nodes ) {
-		n.label = label_vertex(n, coords, partition600);
+		n.label = label_vertex(n, coords, CELLINDEX.PARTITION600);
 	}
 
 	for( const n of nodes ) {
@@ -584,7 +516,7 @@ function make_600cell_vertices() {
 
 
 	index_nodes(nodes);
-	scale_nodes(nodes, 0.75);
+	scale_nodes(nodes, 0.5);
 	return nodes;
 }
 
@@ -598,7 +530,6 @@ function get_node(nodes, id) {
 }
 
 function audit_link_labels(nodes, links) {
-	console.log("Link audit");
 	for( const l of links ) {
 		const n1 = get_node(nodes, l.source);
 		const n2 = get_node(nodes, l.target);
@@ -627,18 +558,97 @@ export const cell600 = () => {
 		name: '600-cell',
 		nodes: nodes,
 		links: links,
-		geometry: {
-			node_size: 0.02,
-			link_size: 0.02
-		},
 		options: [
 			{ name: "none", links: [ 0 ]},
 			{ name: "one 24-cell", links: [ 0, 1 ] },
 			{ name: "five 24-cells", links: [ 0, 1, 2, 3, 4, 5 ] }
-		]
+		],
+		description: `The 600-cell is the four-dimensional analogue of the
+		icosahedron, and consists of 600 tetrahedra joined at 1200 faces
+		with five tetrahedra around each edge. It is dual to the 120-cell.
+		Its 120 vertices can be partitioned into five sets which form the
+		vertices of five inscribed 24-cells.`,
 	}
 }
 
+
+export const cell600_layered = () => {
+	const nodes  = make_600cell_vertices();
+	const links = auto_detect_edges(nodes, 12);
+
+	nodes.map((n) => n.label = 9); // make all invisible by default
+
+	for (const cstr in CELLINDEX.LAYERS600 ) {
+		label_nodes(nodes, CELLINDEX.LAYERS600[cstr], Number(cstr));
+	}
+
+	links.map((l) => {
+		const labels = link_labels(nodes, l);
+		if( labels[0] >= labels[1] ) {
+			l.label = labels[0];
+		} else {
+			l.label = labels[1];
+		}
+	});
+
+	const options = [];
+	const layers = [];
+
+	for( const i of [ 0, 1, 2, 3, 4, 5, 6, 7 ] ) {
+		layers.push(i);
+		options.push({
+			name: CELLINDEX.LAYER_NAMES[i],
+			links: [...layers],
+			nodes: [...layers]
+		})
+	}
+
+	return {
+		name: '600-cell layered',
+		nodes: nodes,
+		links: links,
+		nolink2opacity: true,
+		options: options,
+		description: `This version of the 600-cell lets you explore its
+		structure by building each layer from the 'north pole' onwards.`,
+	}
+
+
+}
+
+
+export const snub24cell = () => {
+	const nodes600  = make_600cell_vertices();
+	const links600 = auto_detect_edges(nodes600, 12);
+
+	const nodes = nodes600.filter((n) => n.label != 1);
+	const links = links600.filter((l) => {
+		const sn = node_by_id(nodes, l.source);
+		const tn = node_by_id(nodes, l.target);
+		return sn && tn;
+	});
+
+	links.map((l) => l.label = 0);
+
+	return {
+		name: 'Snub 24-cell',
+		nodes: nodes,
+		links: links,
+		options: [ { name: "--" } ],
+		description: `The snub 24-cell is a semiregular polytope which
+		connects the 24-cell with the 600-cell. It consists of 24 icosahedra
+		and 120 tetrahedra, and is constructed by removing one of the
+		five inscribed 24-cells from a 600-cell.`
+
+	}
+
+
+}
+
+
+
+
+
 function make_dodecahedron_vertices() {
 	const phi = 0.5 * (1 + Math.sqrt(5));  
 	const phiinv = 1 / phi;    
@@ -669,6 +679,7 @@ function make_dodecahedron_vertices() {
 			{ x: -phi, y: phiinv, z:0, w: 0 , 	label: 4},
 			{ x: -phi, y: -phiinv, z:0, w: 0 , 	label: 2},
 		];
+	scale_nodes(nodes, 1 / Math.sqrt(3));
 	index_nodes(nodes);
 	return nodes;
 }
@@ -686,18 +697,146 @@ export const dodecahedron = () => {
 	}
 
 	return {
-		name: 'dodecahedron',
+		name: 'Dodecahedron',
 		nodes: nodes,
 		links: links,
-		geometry: {
-			node_size: 0.02,
-			link_size: 0.02
-		},
 		options: [
 			{ name: "none", links: [ 0 ]},
 			{ name: "one tetrahedron", links: [ 0, 1 ] },
 			{ name: "five tetrahedra", links: [ 0, 1, 2, 3, 4, 5 ] }
-		]
+		],
+		description: `The dodecahedron is a three-dimensional polyhedron
+		which is included here so that you can see the partition of its
+		vertices into five interlocked tetrahedra. This structure is the
+		basis for the partition of the 120-cell's vertices into five
+		600-cells.`
+
+	}
+}
+
+
+export const tetrahedron = () => {
+	const r2 = Math.sqrt(2);
+	const r3 = Math.sqrt(3);
+	return {
+		name: 'Tetrahedron',
+		nodes: [
+	      {id:1, label: 1, x: 2 * r2 / 3, y: 0, z: -1/3, w: 0 },
+	      {id:2, label: 2, x: -r2 / 3, y: r2 / r3, z: -1/3, w: 0 },
+	      {id:3, label: 3, x: -r2 / 3, y: -r2 / r3, z: -1/3, w: 0 },
+	      {id:4, label: 4, x: 0, y: 0, z: 1, w: 0 },
+		],
+		links: [
+			{ id:1, source:1, target: 2},
+			{ id:2, source:1, target: 3},
+			{ id:3, source:1, target: 4},
+			{ id:4, source:2, target: 3},
+			{ id:5, source:2, target: 4},
+			{ id:6, source:3, target: 4},
+		],
+		options: [ { name: '--' }],
+		description: `The simplest three-dimensional polytope, consisting of four triangles joined at six edges. The 5-cell is its four-dimensional analogue.`,
+	};
+};
+
+export const octahedron = () => {
+	const nodes = [
+		{id: 1, label: 1, x: 1, y: 0, z: 0, w: 0},
+		{id: 2, label: 1, x: -1, y: 0, z: 0, w: 0},
+		{id: 3, label: 2, x: 0, y: 1, z: 0, w: 0},
+		{id: 4, label: 2, x: 0, y: -1, z: 0, w: 0},
+		{id: 5, label: 3, x: 0, y: 0, z: 1, w: 0},
+		{id: 6, label: 3, x: 0, y: 0, z: -1, w: 0},
+	];
+	const links = [
+		{id:1, source: 1, target: 3},
+		{id:2, source: 1, target: 4},
+		{id:3, source: 1, target: 5},
+		{id:4, source: 1, target: 6},
+		{id:5, source: 2, target: 3},
+		{id:6, source: 2, target: 4},
+		{id:7, source: 2, target: 5},
+		{id:8, source: 2, target: 6},
+		{id:9, source: 3, target: 5},
+		{id:10, source: 3, target: 6},
+		{id:11, source: 4, target: 5},
+		{id:12, source: 4, target: 6},
+	]
+	links.map((l) => { l.label = 0 });
+	return {
+		name: 'Octahedron',
+		nodes: nodes,
+		links: links,
+		options: [ { name: '--' }],
+		description: `The three-dimensional cross-polytope, the 16-cell is its four-dimensional analogue.`,
+	};
+
+}
+
+export const cube = () => {
+	const nodes = [
+		{id: 1, label: 1, x: 1, y: 1, z: 1, w: 0},
+		{id: 2, label: 2, x: -1, y: 1, z: 1, w: 0},
+		{id: 3, label: 2, x: 1, y: -1, z: 1, w: 0},
+		{id: 4, label: 1, x: -1, y: -1, z: 1, w: 0},
+		{id: 5, label: 2, x: 1, y: 1, z: -1, w: 0},
+		{id: 6, label: 1, x: -1, y: 1, z: -1, w: 0},
+		{id: 7, label: 1, x: 1, y: -1, z: -1, w: 0},
+		{id: 8, label: 2, x: -1, y: -1, z: -1, w: 0},
+	];
+	scale_nodes(nodes, 1/Math.sqrt(3));
+	const links = auto_detect_edges(nodes, 3);
+	links.map((l) => { l.label = 0 });
+	return {
+		name: 'Cube',
+		nodes: nodes,
+		links: links,
+		options: [ { name: '--' }],
+		description: `The three-dimensional measure polytope, the tesseract is its four-dimensional analogue.`,
+	};
+
+}
+
+
+
+function make_icosahedron_vertices() {
+	const phi = 0.5 * (1 + Math.sqrt(5));  
+
+	const nodes = [
+		{ x: 0, y: 1, z: phi, w: 0, label: 1 },
+		{ x: 0, y: -1, z: phi, w: 0, label: 1 },
+		{ x: 0, y: 1, z: -phi, w: 0, label: 1 },
+		{ x: 0, y: -1, z: -phi, w: 0, label: 1 },
+		{ x: 1, y: phi, z: 0, w: 0, label: 2 },
+		{ x: -1, y: phi, z: 0, w: 0, label: 2 },
+		{ x: 1, y: -phi, z: 0, w: 0, label: 2 },
+		{ x: -1, y: -phi, z: 0, w: 0, label: 2 },
+		{ x: phi, y: 0, z: 1, w: 0, label: 3},
+		{ x: phi, y: 0, z: -1, w: 0, label: 3},
+		{ x: -phi, y: 0, z: 1, w: 0, label: 3},
+		{ x: -phi, y: 0, z: -1, w: 0, label: 3},
+		];
+
+   	scale_nodes(nodes, 1/Math.sqrt((5 + Math.sqrt(5)) / 2));
+	index_nodes(nodes);
+	return nodes;
+}
+
+
+
+export const icosahedron = () => {
+	const nodes  = make_icosahedron_vertices();
+	const links = auto_detect_edges(nodes, 5);
+	links.map((l) => l.label = 0);
+
+	return {
+		name: 'Icosahedron',
+		nodes: nodes,
+		links: links,
+		options: [
+			{ name: "--"},
+		],
+		description: `The icosahedron is a twenty-sided polyhedron and is dual to the dodecahedron. Its four-dimensional analogue is the 600-cell.`
 
 	}
 }
@@ -705,13 +844,23 @@ export const dodecahedron = () => {
 
 export const build_all = () => {
 	return [
+		tetrahedron(),
+		octahedron(),
+		cube(),
+		icosahedron(),
 	 	dodecahedron(),
 	 	cell5(),
 		cell16(),
 		tesseract(),
 		cell24(),
+		snub24cell(),
 		cell600(),
+		cell600_layered(),
 	 	cell120_inscribed(),
 	 	cell120_layered()
 	 	];
 }
+
+export const radii = (shape) => {
+	return shape.nodes.map(n => Math.sqrt(n.x * n.x + n.y * n.y + n.z * n.z + n.w * n.w))
+}

rotation.js

@@ -81,24 +81,5 @@ export const rotfn = {
 	ZW: rotZW,
 };
 
-const rotMode = {
-	'rigid': [ rotYW, rotXW ],
-	'tumbling': [ rotYW, rotXZ  ],
-	'inside-out': [ rotYW, rotXY ],
-	'axisymmetrical': [ rotZW, rotXY ]
-};
-
-
-export const get_rotation = (mode, theta, psi) => {
-	const fns = rotMode[mode];
-	return [ fns[0](theta), fns[1](psi) ];
-}
-
-
-
-	// [
-	// 	rotfn[gui.params.xRotate](theta), 
-	// 	rotfn[gui.params.yRotate](psi)
-	// ];
 
 

vite.config.js

@@ -3,5 +3,14 @@
 import { defineConfig, loadEnv } from 'vite';
 
 export default defineConfig({
-	base: '/fourjs/'	
+	base: '/fourjs/',
+	build: {
+		rollupOptions: {
+			output: {
+				manualChunks: {
+					threejs: [ 'three' ]
+				}
+			}		
+		}
+	}	
 })