<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js canvas - geometry - terrain</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
color: #71544e;
font-family:Monospace;
font-size:13px;
text-align:center;
background-color: #bfd1e5;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
a {
color: #b07861;
}
</style>
</head>
<body>
<div id="container"><br /><br /><br /><br /><br />Generating...</div>
<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> - terrain demo. <a href="canvas_geometry_terrain.html">generate another</a></div>
<script src="../build/three.min.js"></script>
<script src="js/renderers/Projector.js"></script>
<script src="js/renderers/CanvasRenderer.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="js/ImprovedNoise.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var mesh;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 500;
scene = new THREE.Scene();
var data = generateHeight( 1024, 1024 );
var texture = new THREE.Texture( generateTexture( data, 1024, 1024 ) );
texture.needsUpdate = true;
var material = new THREE.MeshBasicMaterial( { map: texture, overdraw: 0.5 } );
var quality = 16, step = 1024 / quality;
var geometry = new THREE.PlaneGeometry( 2000, 2000, quality - 1, quality - 1 );
geometry.applyMatrix( new THREE.Matrix4().makeRotationX( - Math.PI / 2 ) );
for ( var i = 0, l = geometry.vertices.length; i < l; i ++ ) {
var x = i % quality, y = Math.floor( i / quality );
geometry.vertices[ i ].y = data[ ( x * step ) + ( y * step ) * 1024 ] * 2 - 128;
}
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
renderer = new THREE.CanvasRenderer();
renderer.setClearColor( 0xbfd1e5 );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.innerHTML = "";
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function generateHeight( width, height ) {
var data = new Uint8Array( width * height ), perlin = new ImprovedNoise(),
size = width * height, quality = 2, z = Math.random() * 100;
for ( var j = 0; j < 4; j ++ ) {
quality *= 4;
for ( var i = 0; i < size; i ++ ) {
var x = i % width, y = ~~ ( i / width );
data[ i ] += Math.abs( perlin.noise( x / quality, y / quality, z ) * 0.5 ) * quality + 10;
}
}
return data;
}
function generateTexture( data, width, height ) {
var canvas, context, image, imageData,
level, diff, vector3, sun, shade;
vector3 = new THREE.Vector3( 0, 0, 0 );
sun = new THREE.Vector3( 1, 1, 1 );
sun.normalize();
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, width, height );
imageData = image.data;
for ( var i = 0, j = 0, l = imageData.length; i < l; i += 4, j ++ ) {
vector3.x = data[ j - 1 ] - data[ j + 1 ];
vector3.y = 2;
vector3.z = data[ j - width ] - data[ j + width ];
vector3.normalize();
shade = vector3.dot( sun );
imageData[ i ] = ( 96 + shade * 128 ) * ( data[ j ] * 0.007 );
imageData[ i + 1 ] = ( 32 + shade * 96 ) * ( data[ j ] * 0.007 );
imageData[ i + 2 ] = ( shade * 96 ) * ( data[ j ] * 0.007 );
}
context.putImageData( image, 0, 0 );
return canvas;
}
function onDocumentMouseMove(event) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
camera.position.x += ( mouseX - camera.position.x ) * 0.05;
camera.position.y += ( - mouseY - camera.position.y ) * 0.05 + 15;
camera.lookAt( scene.position );
renderer.render( scene, camera );
}
</script>
</body>
</html>