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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 - Merged</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js",
- "three/addons/": "../../examples/jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
- 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;
- // 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 );
- // Used to move the center of the cube so it scales from the position Z axis
- const originHelper = new THREE.Object3D();
- originHelper.position.z = 0.5;
- positionHelper.add( originHelper );
- const lonFudge = Math.PI * .5;
- const latFudge = Math.PI * - 0.135;
- const geometries = [];
- data.forEach( ( row, latNdx ) => {
- row.forEach( ( value, lonNdx ) => {
- if ( value === undefined ) {
- return;
- }
- const amount = ( value - min ) / range;
- const boxWidth = 1;
- const boxHeight = 1;
- const boxDepth = 1;
- const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
- // 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 origin helper to
- // position this geometry
- positionHelper.scale.set( 0.005, 0.005, THREE.MathUtils.lerp( 0.01, 0.5, amount ) );
- originHelper.updateWorldMatrix( true, false );
- geometry.applyMatrix4( originHelper.matrixWorld );
- geometries.push( geometry );
- } );
- } );
- const mergedGeometry = BufferGeometryUtils.mergeGeometries(
- geometries, false );
- const material = new THREE.MeshBasicMaterial( { color: 'red' } );
- const mesh = new THREE.Mesh( mergedGeometry, material );
- scene.add( mesh );
- }
- 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>
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