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<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>Three.js - Rendering on Demand w/GUI</title>
<style>
html, body {
height: 100%;
margin: 0;
}
#c {
width: 100%;
height: 100%;
display: block;
}
</style>
</head>
<body>
<canvas id="c"></canvas>
</body>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../../build/three.module.js",
"three/addons/": "../../examples/jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import {OrbitControls} from 'three/addons/controls/OrbitControls.js';
import {GUI} from 'three/addons/libs/lil-gui.module.min.js';
function main() {
const canvas = document.querySelector('#c');
const renderer = new THREE.WebGLRenderer({canvas});
const fov = 75;
const aspect = 2; // the canvas default
const near = 0.1;
const far = 5;
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
camera.position.z = 2;
const controls = new OrbitControls(camera, canvas);
controls.enableDamping = true;
controls.target.set(0, 0, 0);
controls.update();
const gui = new GUI();
const scene = new THREE.Scene();
{
const color = 0xFFFFFF;
const intensity = 1;
const light = new THREE.DirectionalLight(color, intensity);
light.position.set(-1, 2, 4);
scene.add(light);
}
const boxWidth = 1;
const boxHeight = 1;
const boxDepth = 1;
const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
class ColorGUIHelper {
constructor(object, prop) {
this.object = object;
this.prop = prop;
}
get value() {
return `#${this.object[this.prop].getHexString()}`;
}
set value(hexString) {
this.object[this.prop].set(hexString);
}
}
function makeInstance(geometry, color, x) {
const material = new THREE.MeshPhongMaterial({color});
const cube = new THREE.Mesh(geometry, material);
scene.add(cube);
cube.position.x = x;
const folder = gui.addFolder(`Cube${x}`);
folder.addColor(new ColorGUIHelper(material, 'color'), 'value')
.name('color')
.onChange(requestRenderIfNotRequested);
folder.add(cube.scale, 'x', .1, 1.5)
.name('scale x')
.onChange(requestRenderIfNotRequested);
folder.open();
return cube;
}
makeInstance(geometry, 0x44aa88, 0);
makeInstance(geometry, 0x8844aa, -2);
makeInstance(geometry, 0xaa8844, 2);
function resizeRendererToDisplaySize(renderer) {
const canvas = renderer.domElement;
const width = canvas.clientWidth;
const height = canvas.clientHeight;
const needResize = canvas.width !== width || canvas.height !== height;
if (needResize) {
renderer.setSize(width, height, false);
}
return needResize;
}
let renderRequested = false;
function render() {
renderRequested = undefined;
if (resizeRendererToDisplaySize(renderer)) {
const canvas = renderer.domElement;
camera.aspect = canvas.clientWidth / canvas.clientHeight;
camera.updateProjectionMatrix();
}
controls.update();
renderer.render(scene, camera);
}
render();
function requestRenderIfNotRequested() {
if (!renderRequested) {
renderRequested = true;
requestAnimationFrame(render);
}
}
controls.addEventListener('change', requestRenderIfNotRequested);
window.addEventListener('resize', requestRenderIfNotRequested);
}
main();
</script>
</html>