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+<!DOCTYPE HTML>
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+<html lang="en">
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+ <head>
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+ <title>three.js - geometry - terrain</title>
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+ <meta charset="utf-8">
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+ <style type="text/css">
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+ body {
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+ color: #71544e;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+
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+ background-color: #bfd1e5;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px; width: 100%;
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+ padding: 5px;
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+ }
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+
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+ a {
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+
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+ color: #b07861;
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+ }
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+
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+ </style>
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+ </head>
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+ <body>
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+
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+ <div id="container"><br /><br /><br /><br /><br />Generating...</div>
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+ <div id="info"><a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - terrain demo.</div>
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+
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+ <script type="text/javascript" src="http://github.com/mrdoob/stats.js/raw/master/build/stats.js"></script>
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+ <script type="text/javascript" src="../build/three.js"></script>
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+
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+ <script type="text/javascript" src="primitives/Plane.js"></script>
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+
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+ <script type="text/javascript">
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+
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+ var Perlin = function () {
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+
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+ // http://mrl.nyu.edu/~perlin/noise/
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+
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+ var p = [151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,
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+ 23,190,6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87,
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+ 174,20,125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,83,111,229,122,60,211,
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+ 133,230,220,105,92,41,55,46,245,40,244,102,143,54,65,25,63,161,1,216,80,73,209,76,132,187,208,
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+ 89,18,169,200,196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,250,124,123,5,
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+ 202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,223,183,170,213,119,
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+ 248,152,2,44,154,163,70,221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,224,232,
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+ 178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,12,191,179,162,241,81,51,145,235,249,
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+ 14,239,107,49,192,214,31,181,199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,205,
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+ 93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180];
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+
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+ for (var i=0; i < 256 ; i++) {
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+
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+ p[256+i] = p[i];
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+
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+ }
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+
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+ function fade(t) {
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+
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+ return t * t * t * (t * (t * 6 - 15) + 10);
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+
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+ }
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+
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+ function lerp(t, a, b) {
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+
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+ return a + t * (b - a);
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+
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+ }
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+
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+ function grad(hash, x, y, z) {
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+
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+ var h = hash & 15;
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+ var u = h < 8 ? x : y, v = h < 4 ? y : h == 12 || h == 14 ? x : z;
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+ return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
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+
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+ }
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+
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+ return {
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+
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+ noise: function (x, y, z) {
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+
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+ var floorX = Math.floor(x), floorY = Math.floor(y), floorZ = Math.floor(z);
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+
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+ var X = floorX & 255, Y = floorY & 255, Z = floorZ & 255;
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+
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+ x -= floorX;
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+ y -= floorY;
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+ z -= floorZ;
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+
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+ var xMinus1 = x -1, yMinus1 = y - 1, zMinus1 = z - 1;
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+
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+ var u = fade(x), v = fade(y), w = fade(z);
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+
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+ var A = p[X]+Y, AA = p[A]+Z, AB = p[A+1]+Z, B = p[X+1]+Y, BA = p[B]+Z, BB = p[B+1]+Z;
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+
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+ return lerp(w, lerp(v, lerp(u, grad(p[AA], x, y, z),
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+ grad(p[BA], xMinus1, y, z)),
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+ lerp(u, grad(p[AB], x, yMinus1, z),
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+ grad(p[BB], xMinus1, yMinus1, z))),
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+ lerp(v, lerp(u, grad(p[AA+1], x, y, zMinus1),
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+ grad(p[BA+1], xMinus1, y, z-1)),
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+ lerp(u, grad(p[AB+1], x, yMinus1, zMinus1),
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+ grad(p[BB+1], xMinus1, yMinus1, zMinus1))));
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+
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+ }
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+ }
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+ }
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+
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+ //
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+
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+ var SCREEN_WIDTH = window.innerWidth, SCREEN_HEIGHT = window.innerHeight;
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+
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+ var container, stats;
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+
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+ var camera, scene, renderer;
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+
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+ var mesh;
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+
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+ var mouseX = 0;
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+ var mouseY = 0;
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+
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+ var windowHalfX = window.innerWidth >> 1;
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+ var windowHalfY = window.innerHeight >> 1;
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+
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+
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+ init();
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+ setInterval( loop, 1000 / 60 );
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+
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+
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+ function init() {
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+
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+ container = document.getElementById( 'container' );
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+
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+ camera = new THREE.Camera(0, 0, 500);
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+ camera.focus = 300;
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+
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+ scene = new THREE.Scene();
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+
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+ var heightMap = height( 1024, 1024 );
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+ var textureMap = shadow( heightMap );
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+ var material = new THREE.BitmapUVMappingMaterial( textureMap );
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+
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+ var quality = 20;
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+ var quality1 = quality + 1;
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+
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+ var plane = new Plane( 2000, 2000, quality, quality );
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+
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+ var data = heightMap.getContext( '2d' ).getImageData( 0, 0, heightMap.width, heightMap.height ).data;
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+ var pixelsPerTriangle = Math.floor(heightMap.width / quality1);
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+
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+ for ( var y = 0; y < quality1; y++ ) {
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+
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+ for (var x = 0; x < quality1; x++ ) {
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+
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+ plane.vertices[x + y * quality1].position.z = data[((x * pixelsPerTriangle) + (y * pixelsPerTriangle) * heightMap.width) * 4];
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+
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+ }
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+
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+ }
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+
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+ mesh = new THREE.Mesh( plane, material );
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+ mesh.rotation.x = -90 * Math.PI / 180;
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+ scene.add(mesh);
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+
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+ renderer = new THREE.CanvasRenderer();
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+ renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
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+
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+ container.innerHTML = "";
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+
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+ container.appendChild(renderer.domElement);
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+
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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.top = '0px';
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+ container.appendChild(stats.domElement);
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+
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+ document.addEventListener('mousemove', onDocumentMouseMove, false);
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+
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+ }
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+
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+ function onDocumentMouseMove(event) {
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+
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+ mouseX = (event.clientX - windowHalfX);
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+ mouseY = (event.clientY - windowHalfY);
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+
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+ }
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+
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+ function loop() {
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+
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+ camera.position.x += (mouseX - camera.position.x) * .05;
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+ camera.position.y += (-mouseY - camera.position.y) * .05;
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+
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+ renderer.render(scene, camera);
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+ stats.update();
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+
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+ }
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+
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+ function height(width, height) {
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+
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+ var canvas, context, image, data;
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+
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+ canvas = document.createElement( 'canvas' );
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+ canvas.width = width;
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+ canvas.height = height;
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+
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+ context = canvas.getContext( '2d' );
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+ context.fillStyle = '#000';
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+ context.fillRect( 0, 0, width, height );
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+
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+ image = context.getImageData( 0, 0, width, height );
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+ data = image.data;
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+
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+ var perlin = new Perlin();
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+
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+ var size = width * height;
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+ var quality = 2;
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+ var zz = Math.random() * 100;
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+
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+ for ( var j = 0; j < 4; j ++ ) {
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+
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+ var x = 0, y = 0, yy = 0;
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+
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+ quality *= 4;
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+
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+ for ( var i = 0; i < size; i ++ ) {
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+
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+ data[ i * 4 ] += Math.floor( perlin.noise( x / quality, yy, zz ) * quality + 10 );
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+
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+ x++;
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+
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+ if (x == width)
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+ {
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+ x = 0;
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+ y ++;
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+ yy = y / quality;
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+ }
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+
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+ }
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+ }
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+
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+ context.putImageData( image, 0, 0 );
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+
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+ return canvas;
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+
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+ }
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+
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+ function shadow( texture ) {
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+
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+ var canvas, context, image, data, src_data,
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+ index, level, diff, width = texture.width, height = texture.height;
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+
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+ canvas = document.createElement( 'canvas' );
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+ canvas.width = width;
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+ canvas.height = height;
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+
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+ context = canvas.getContext( '2d' );
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+ context.fillStyle = '#000';
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+ context.fillRect( 0, 0, width, height );
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+
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+ image = context.getImageData( 0, 0, width, height );
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+ data = image.data;
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+
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+ src_data = texture.getContext( '2d' ).getImageData( 0, 0, width, height ).data;
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+
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+ for ( var y = 0; y < height; y++ ) {
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+
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+ for ( var x = 0; x < width; x++ ) {
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+
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+ index = ( x + y * width ) * 4;
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+
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+ diff = 0;
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+ level = width / 4;
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+
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+ while ( level > 4 ) {
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+
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+ diff += ( ( src_data[ index - level ] >>> 0 ) - ( src_data[ index + level ] >>> 0 ) ) +
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+ ( ( src_data[ index - ( width * level ) ] >>> 0 ) - ( src_data[ index + ( width * level ) ] >>> 0 ) ) + 32;
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+
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+ level /= 2;
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+
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+ }
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+
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+ data[ index ] = diff * 0.45;
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+ data[ index + 1 ] = diff * 0.29;
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+ data[ index + 2 ] = diff * 0.19;
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+
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+ }
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+ }
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+
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+ context.putImageData( image, 0, 0 );
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+
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+ return canvas;
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+ }
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+
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+
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+ </script>
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+
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+ </body>
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+</html>
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Mr.doob
