fourdjs/main.js

229 lines
5.7 KiB
JavaScript

import * as THREE from 'three';
import * as POLYTOPES from './polytopes.js';
import { get_rotation } 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;
// scene, lights and camera
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
const light = new THREE.PointLight(0xffffff, 2);
light.position.set(10, 10, 10);
scene.add(light);
const light2 = new THREE.PointLight(0xffffff, 2);
light2.position.set(-10, 5, 10);
scene.add(light);
const amblight = new THREE.AmbientLight(0xffffff, 0.5);
scene.add(amblight);
camera.position.set(1, 1, 3);
camera.lookAt(0, 0, 0);
camera.position.z = 4;
const renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
// set up colours and materials for gui callbacks
scene.background = new THREE.Color(DEFAULTS.background);
const material = new THREE.MeshStandardMaterial({ color: DEFAULTS.color });
const node_colours = get_colours(DEFAULTS.color);
material.transparent = true;
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}));
link_ms.map((m) => {
m.transparent = true;
m.opacity = 0.5;
}
)
const face_ms = [
new THREE.MeshLambertMaterial( { color: 0x44ff44 } )
];
for( const face_m of face_ms ) {
face_m.transparent = true;
face_m.opacity = FACE_OPACITY;
}
// the best way to do this -
// each STRUCTURE should present a menu of OPTIONS which
// are say a set of inscribed shapes, or a subset etc
// ie 120-cell - inscribed, layers, hopf fibrations etc
const STRUCTURES = {
'5-cell': POLYTOPES.cell5(),
'16-cell': POLYTOPES.cell16(),
'tesseract': POLYTOPES.tesseract(),
'24-cell': POLYTOPES.cell24(),
'dodecahedron': POLYTOPES.dodecahedron(),
'120-cell': POLYTOPES.cell120(),
'120-cell-a': POLYTOPES.cell120_layered(1),
'120-cell-b': POLYTOPES.cell120_layered(2),
'120-cell-c': POLYTOPES.cell120_layered(3),
'120-cell-d': POLYTOPES.cell120_layered(4),
'120-cell-e': POLYTOPES.cell120_layered(5),
'120-cell-f': POLYTOPES.cell120_layered(6),
'600-cell': POLYTOPES.cell600(),
};
const INSCRIBED = {
'tesseract': POLYTOPES.tesseract_inscribed(),
'24-cell': POLYTOPES.cell24_inscribed(),
'120-cell': POLYTOPES.cell120_inscribed(),
'600-cell': POLYTOPES.cell600_inscribed(),
'dodecahedron': POLYTOPES.dodecahedron_inscribed(),
};
const ALL_INSCRIBED = {
'tesseract': POLYTOPES.tesseract_all_inscribed(),
'24-cell': POLYTOPES.cell24_all_inscribed(),
'120-cell': POLYTOPES.cell120_all_inscribed(),
'600-cell': POLYTOPES.cell600_all_inscribed(),
'dodecahedron': POLYTOPES.dodecahedron_all_inscribed(),
}
let shape = false;
function createShape(name, inscribed, all) {
if( shape ) {
scene.remove(shape);
}
let structure = STRUCTURES[name];
if( inscribed ) {
if( name in INSCRIBED ) {
if( all ) {
structure = ALL_INSCRIBED[name];
} else {
structure = INSCRIBED[name];
}
}
}
shape = new FourDShape(node_ms, link_ms, face_ms, structure);
scene.add(shape);
}
// initialise gui and read params from URL
// callbacks to do things which are triggered by controls: reset the shape,
// change the colors. Otherwise we just read stuff from gui.params.
function setColors(c) {
const nc = get_colours(c);
for( let i = 0; i < node_ms.length; i++ ) {
node_ms[i].color = new THREE.Color(nc[i]);
link_ms[i].color = new THREE.Color(nc[i]);
}
material.color = new THREE.Color(c);
}
function setBackground(c) {
scene.background = new THREE.Color(c)
}
function setLinkOpacity(o, primary) {
if( primary ) {
link_ms[0].opacity = o;
} else {
for( const lm of link_ms.slice(1) ) {
lm.opacity = o;
}
}
}
let gui; //
let visible_labels = 6;
function changeShape() {
createShape(gui.params.shape, gui.params.inscribed, gui.params.inscribe_all);
}
function setVisibility(v) {
console.log("setVisibility");
visible_labels = v;
}
gui = new FourDGUI(changeShape, setColors, setBackground, setLinkOpacity, setVisibility);
// these are here to pick up colour settings from the URL params
setColors(gui.params.color);
setBackground(gui.params.background);
const dragK = 0.005;
const damping = 0.99;
let theta = 0;
let psi = 0;
let theta0 = 0;
let psi0 = 0;
let dragx0 = 0;
let dragy0 = 0;
let dragging = false;
renderer.domElement.addEventListener("pointerdown", (event) => {
if( event.buttons === 1 ) {
theta0 = theta;
psi0 = psi;
dragx0 = event.clientX;
dragy0 = event.clientY;
dragging = true;
}
})
renderer.domElement.addEventListener("pointermove", (event) => {
if( event.buttons === 1 ) {
const theta1 = theta0 + (event.clientX - dragx0) * dragK;
const psi1 = psi0 + (event.clientY - dragy0) * dragK;
gui.params.dtheta = theta1 - theta;
gui.params.dpsi = psi1 - psi;
theta = theta1;
psi = psi1;
}
})
renderer.domElement.addEventListener("pointerup", (event) => {
dragging = false;
})
createShape(gui.params.shape, gui.params.inscribed, gui.params.inscribe_all);
function animate() {
requestAnimationFrame( animate );
if( ! dragging ) {
theta += gui.params.dtheta;
psi += gui.params.dpsi;
if( gui.params.damping ) {
gui.params.dtheta = gui.params.dtheta * damping;
gui.params.dpsi = gui.params.dpsi * damping;
}
}
const rotations = get_rotation(gui.params.rotation, theta, psi);
shape.hyperplane = gui.params.hyperplane;
shape.link_scale = gui.params.thickness;
shape.node_scale = gui.params.nodesize;
shape.render3(rotations, (l) => l <= visible_labels);
renderer.render( scene, camera );
}
animate();