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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>
<!-- 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 * 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({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);
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.mergeBufferGeometries(
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>