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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - geometry - terrain + fog</title>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
- <link type="text/css" rel="stylesheet" href="main.css">
- <style>
- body {
- background-color: #efd1b5;
- color: #61443e;
- }
- a {
- color: #a06851;
- }
- </style>
- </head>
- <body>
- <div id="container"></div>
- <div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl terrain + fog demo <br />(left click: forward, right click: backward)</div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import Stats from 'three/addons/libs/stats.module.js';
- import { FirstPersonControls } from 'three/addons/controls/FirstPersonControls.js';
- import { ImprovedNoise } from 'three/addons/math/ImprovedNoise.js';
- let container, stats;
- let camera, controls, scene, renderer;
- let mesh, texture;
- const worldWidth = 256, worldDepth = 256;
- const clock = new THREE.Clock();
- init();
- function init() {
- container = document.getElementById( 'container' );
- camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0xefd1b5 );
- scene.fog = new THREE.FogExp2( 0xefd1b5, 0.0025 );
- const data = generateHeight( worldWidth, worldDepth );
- camera.position.set( 100, 800, - 800 );
- camera.lookAt( - 100, 810, - 800 );
- const geometry = new THREE.PlaneGeometry( 7500, 7500, worldWidth - 1, worldDepth - 1 );
- geometry.rotateX( - Math.PI / 2 );
- const vertices = geometry.attributes.position.array;
- for ( let i = 0, j = 0, l = vertices.length; i < l; i ++, j += 3 ) {
- vertices[ j + 1 ] = data[ i ] * 10;
- }
- texture = new THREE.CanvasTexture( generateTexture( data, worldWidth, worldDepth ) );
- texture.wrapS = THREE.ClampToEdgeWrapping;
- texture.wrapT = THREE.ClampToEdgeWrapping;
- texture.colorSpace = THREE.SRGBColorSpace;
- mesh = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { map: texture } ) );
- scene.add( mesh );
- renderer = new THREE.WebGLRenderer();
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- container.appendChild( renderer.domElement );
- controls = new FirstPersonControls( camera, renderer.domElement );
- controls.movementSpeed = 150;
- controls.lookSpeed = 0.1;
- stats = new Stats();
- container.appendChild( stats.dom );
- //
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- controls.handleResize();
- }
- function generateHeight( width, height ) {
- let seed = Math.PI / 4;
- window.Math.random = function () {
- const x = Math.sin( seed ++ ) * 10000;
- return x - Math.floor( x );
- };
- const size = width * height, data = new Uint8Array( size );
- const perlin = new ImprovedNoise(), z = Math.random() * 100;
- let quality = 1;
- for ( let j = 0; j < 4; j ++ ) {
- for ( let i = 0; i < size; i ++ ) {
- const x = i % width, y = ~ ~ ( i / width );
- data[ i ] += Math.abs( perlin.noise( x / quality, y / quality, z ) * quality * 1.75 );
- }
- quality *= 5;
- }
- return data;
- }
- function generateTexture( data, width, height ) {
- let context, image, imageData, shade;
- const vector3 = new THREE.Vector3( 0, 0, 0 );
- const sun = new THREE.Vector3( 1, 1, 1 );
- sun.normalize();
- const canvas = document.createElement( 'canvas' );
- canvas.width = width;
- canvas.height = height;
- context = canvas.getContext( '2d' );
- context.fillStyle = '#000';
- context.fillRect( 0, 0, width, height );
- image = context.getImageData( 0, 0, canvas.width, canvas.height );
- imageData = image.data;
- for ( let i = 0, j = 0, l = imageData.length; i < l; i += 4, j ++ ) {
- vector3.x = data[ j - 2 ] - data[ j + 2 ];
- vector3.y = 2;
- vector3.z = data[ j - width * 2 ] - data[ j + width * 2 ];
- vector3.normalize();
- shade = vector3.dot( sun );
- imageData[ i ] = ( 96 + shade * 128 ) * ( 0.5 + data[ j ] * 0.007 );
- imageData[ i + 1 ] = ( 32 + shade * 96 ) * ( 0.5 + data[ j ] * 0.007 );
- imageData[ i + 2 ] = ( shade * 96 ) * ( 0.5 + data[ j ] * 0.007 );
- }
- context.putImageData( image, 0, 0 );
- // Scaled 4x
- const canvasScaled = document.createElement( 'canvas' );
- canvasScaled.width = width * 4;
- canvasScaled.height = height * 4;
- context = canvasScaled.getContext( '2d' );
- context.scale( 4, 4 );
- context.drawImage( canvas, 0, 0 );
- image = context.getImageData( 0, 0, canvasScaled.width, canvasScaled.height );
- imageData = image.data;
- for ( let i = 0, l = imageData.length; i < l; i += 4 ) {
- const v = ~ ~ ( Math.random() * 5 );
- imageData[ i ] += v;
- imageData[ i + 1 ] += v;
- imageData[ i + 2 ] += v;
- }
- context.putImageData( image, 0, 0 );
- return canvasScaled;
- }
- //
- function animate() {
- render();
- stats.update();
- }
- function render() {
- controls.update( clock.getDelta() );
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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