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233 lines
7.1 KiB
233 lines
7.1 KiB
2 years 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 - Merged w/vertex colors</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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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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 * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
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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({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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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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// 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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// Used to move the center of the cube so it scales from the position Z axis
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const originHelper = new THREE.Object3D();
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originHelper.position.z = 0.5;
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positionHelper.add(originHelper);
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const color = new THREE.Color();
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const lonFudge = Math.PI * .5;
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const latFudge = Math.PI * -0.135;
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const geometries = [];
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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 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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// 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 origin helper to
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// position this geometry
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positionHelper.scale.set(0.005, 0.005, THREE.MathUtils.lerp(0.01, 0.5, amount));
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originHelper.updateWorldMatrix(true, false);
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geometry.applyMatrix4(originHelper.matrixWorld);
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// compute a color
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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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color.setHSL(hue, saturation, lightness);
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// get the colors as an array of values from 0 to 255
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const rgb = color.toArray().map(v => v * 255);
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// make an array to store colors for each vertex
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const numVerts = geometry.getAttribute('position').count;
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const itemSize = 3; // r, g, b
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const colors = new Uint8Array(itemSize * numVerts);
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// copy the color into the colors array for each vertex
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colors.forEach((v, ndx) => {
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colors[ndx] = rgb[ndx % 3];
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});
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const normalized = true;
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const colorAttrib = new THREE.BufferAttribute(colors, itemSize, normalized);
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geometry.setAttribute('color', colorAttrib);
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geometries.push(geometry);
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});
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});
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const mergedGeometry = BufferGeometryUtils.mergeBufferGeometries(
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geometries, false);
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const material = new THREE.MeshBasicMaterial({
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vertexColors: true,
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});
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const mesh = new THREE.Mesh(mergedGeometry, material);
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scene.add(mesh);
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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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