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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 - Lots of Objects - Slow</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@1.8.0/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';
function main() {
const canvas = document.querySelector( '#c' );
const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
const fov = 60;
const aspect = 2; // the canvas default
const near = 0.1;
const far = 10;
const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
camera.position.z = 2.5;
const controls = new OrbitControls( camera, canvas );
controls.enableDamping = true;
controls.enablePan = false;
controls.minDistance = 1.2;
controls.maxDistance = 4;
controls.update();
const scene = new THREE.Scene();
scene.background = new THREE.Color( 'black' );
{
const loader = new THREE.TextureLoader();
const texture = loader.load( 'resources/images/world.jpg', render );
texture.colorSpace = THREE.SRGBColorSpace;
const geometry = new THREE.SphereGeometry( 1, 64, 32 );
const material = new THREE.MeshBasicMaterial( { map: texture } );
scene.add( new THREE.Mesh( geometry, material ) );
}
async function loadFile( url ) {
const req = await fetch( url );
return req.text();
}
function parseData( text ) {
const data = [];
const settings = { data };
let max;
let min;
// split into lines
text.split( '\n' ).forEach( ( line ) => {
// split the line by whitespace
const parts = line.trim().split( /\s+/ );
if ( parts.length === 2 ) {
// only 2 parts, must be a key/value pair
settings[ parts[ 0 ] ] = parseFloat( parts[ 1 ] );
} else if ( parts.length > 2 ) {
// more than 2 parts, must be data
const values = parts.map( ( v ) => {
const value = parseFloat( v );
if ( value === settings.NODATA_value ) {
return undefined;
}
max = Math.max( max === undefined ? value : max, value );
min = Math.min( min === undefined ? value : min, value );
return value;
} );
data.push( values );
}
} );
return Object.assign( settings, { min, max } );
}
function addBoxes( file ) {
const { min, max, data } = file;
const range = max - min;
// make one box geometry
const boxWidth = 1;
const boxHeight = 1;
const boxDepth = 1;
const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
// make it so it scales away from the positive Z axis
geometry.applyMatrix4( new THREE.Matrix4().makeTranslation( 0, 0, 0.5 ) );
// these helpers will make it easy to position the boxes
// We can rotate the lon helper on its Y axis to the longitude
const lonHelper = new THREE.Object3D();
scene.add( lonHelper );
// We rotate the latHelper on its X axis to the latitude
const latHelper = new THREE.Object3D();
lonHelper.add( latHelper );
// The position helper moves the object to the edge of the sphere
const positionHelper = new THREE.Object3D();
positionHelper.position.z = 1;
latHelper.add( positionHelper );
const lonFudge = Math.PI * .5;
const latFudge = Math.PI * - 0.135;
data.forEach( ( row, latNdx ) => {
row.forEach( ( value, lonNdx ) => {
if ( value === undefined ) {
return;
}
const amount = ( value - min ) / range;
const material = new THREE.MeshBasicMaterial();
const hue = THREE.MathUtils.lerp( 0.7, 0.3, amount );
const saturation = 1;
const lightness = THREE.MathUtils.lerp( 0.4, 1.0, amount );
material.color.setHSL( hue, saturation, lightness );
const mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
// adjust the helpers to point to the latitude and longitude
lonHelper.rotation.y = THREE.MathUtils.degToRad( lonNdx + file.xllcorner ) + lonFudge;
latHelper.rotation.x = THREE.MathUtils.degToRad( latNdx + file.yllcorner ) + latFudge;
// use the world matrix of the position helper to
// position this mesh.
positionHelper.updateWorldMatrix( true, false );
mesh.applyMatrix4( positionHelper.matrixWorld );
mesh.scale.set( 0.005, 0.005, THREE.MathUtils.lerp( 0.01, 0.5, amount ) );
} );
} );
}
loadFile( 'resources/data/gpw/gpw_v4_basic_demographic_characteristics_rev10_a000_014mt_2010_cntm_1_deg.asc' )
.then( parseData )
.then( addBoxes )
.then( render );
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>