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242 lines
5.8 KiB
HTML
242 lines
5.8 KiB
HTML
2 months ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Lots of Objects - Slow</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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</body>
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<script type="importmap">
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{
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"imports": {
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"three": "../../build/three.module.js",
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"three/addons/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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function main() {
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const canvas = document.querySelector( '#c' );
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const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
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const fov = 60;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 10;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.z = 2.5;
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const controls = new OrbitControls( camera, canvas );
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controls.enableDamping = true;
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controls.enablePan = false;
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controls.minDistance = 1.2;
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controls.maxDistance = 4;
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controls.update();
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const scene = new THREE.Scene();
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scene.background = new THREE.Color( 'black' );
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{
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const loader = new THREE.TextureLoader();
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const texture = loader.load( 'resources/images/world.jpg', render );
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texture.colorSpace = THREE.SRGBColorSpace;
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const geometry = new THREE.SphereGeometry( 1, 64, 32 );
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const material = new THREE.MeshBasicMaterial( { map: texture } );
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scene.add( new THREE.Mesh( geometry, material ) );
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}
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async function loadFile( url ) {
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const req = await fetch( url );
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return req.text();
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}
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function parseData( text ) {
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const data = [];
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const settings = { data };
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let max;
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let min;
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// split into lines
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text.split( '\n' ).forEach( ( line ) => {
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// split the line by whitespace
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const parts = line.trim().split( /\s+/ );
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if ( parts.length === 2 ) {
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// only 2 parts, must be a key/value pair
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settings[ parts[ 0 ] ] = parseFloat( parts[ 1 ] );
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} else if ( parts.length > 2 ) {
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// more than 2 parts, must be data
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const values = parts.map( ( v ) => {
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const value = parseFloat( v );
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if ( value === settings.NODATA_value ) {
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return undefined;
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}
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max = Math.max( max === undefined ? value : max, value );
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min = Math.min( min === undefined ? value : min, value );
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return value;
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} );
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data.push( values );
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}
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} );
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return Object.assign( settings, { min, max } );
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}
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function addBoxes( file ) {
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const { min, max, data } = file;
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const range = max - min;
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// make one box geometry
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const boxWidth = 1;
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const boxHeight = 1;
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const boxDepth = 1;
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const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
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// make it so it scales away from the positive Z axis
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geometry.applyMatrix4( new THREE.Matrix4().makeTranslation( 0, 0, 0.5 ) );
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// these helpers will make it easy to position the boxes
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// We can rotate the lon helper on its Y axis to the longitude
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const lonHelper = new THREE.Object3D();
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scene.add( lonHelper );
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// We rotate the latHelper on its X axis to the latitude
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const latHelper = new THREE.Object3D();
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lonHelper.add( latHelper );
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// The position helper moves the object to the edge of the sphere
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const positionHelper = new THREE.Object3D();
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positionHelper.position.z = 1;
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latHelper.add( positionHelper );
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const lonFudge = Math.PI * .5;
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const latFudge = Math.PI * - 0.135;
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data.forEach( ( row, latNdx ) => {
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row.forEach( ( value, lonNdx ) => {
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if ( value === undefined ) {
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return;
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}
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const amount = ( value - min ) / range;
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const material = new THREE.MeshBasicMaterial();
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const hue = THREE.MathUtils.lerp( 0.7, 0.3, amount );
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const saturation = 1;
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const lightness = THREE.MathUtils.lerp( 0.4, 1.0, amount );
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material.color.setHSL( hue, saturation, lightness );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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// adjust the helpers to point to the latitude and longitude
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lonHelper.rotation.y = THREE.MathUtils.degToRad( lonNdx + file.xllcorner ) + lonFudge;
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latHelper.rotation.x = THREE.MathUtils.degToRad( latNdx + file.yllcorner ) + latFudge;
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// use the world matrix of the position helper to
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// position this mesh.
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positionHelper.updateWorldMatrix( true, false );
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mesh.applyMatrix4( positionHelper.matrixWorld );
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mesh.scale.set( 0.005, 0.005, THREE.MathUtils.lerp( 0.01, 0.5, amount ) );
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} );
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} );
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}
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loadFile( 'resources/data/gpw/gpw_v4_basic_demographic_characteristics_rev10_a000_014mt_2010_cntm_1_deg.asc' )
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.then( parseData )
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.then( addBoxes )
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.then( render );
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function resizeRendererToDisplaySize( renderer ) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if ( needResize ) {
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renderer.setSize( width, height, false );
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}
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return needResize;
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}
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let renderRequested = false;
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function render() {
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renderRequested = undefined;
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if ( resizeRendererToDisplaySize( renderer ) ) {
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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controls.update();
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renderer.render( scene, camera );
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}
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render();
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function requestRenderIfNotRequested() {
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if ( ! renderRequested ) {
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renderRequested = true;
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requestAnimationFrame( render );
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}
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}
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controls.addEventListener( 'change', requestRenderIfNotRequested );
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window.addEventListener( 'resize', requestRenderIfNotRequested );
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}
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main();
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</script>
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</html>
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