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three.js

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提交 a964d27b 编写于 作者: M Mr.doob
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<!DOCTYPE HTML>
<html lang="en">
<head>
<title>three.js - geometry - webgl terrain</title>
<meta charset="utf-8">
<style type="text/css">
body {
color: #61443e;
font-family:Monospace;
font-size:13px;
text-align:center;
background-color: #efd1b5;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
a {
color: #a06851;
}
</style>
</head>
<body>
<div id="container"><br /><br /><br /><br /><br />Generating world...</div>
<div id="info"><a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - webgl terrain demo<br />(left click: forward, right click: backward)</div>
<script type="text/javascript" src="js/Stats.js"></script>
<script type="text/javascript" src="js/ImprovedNoise.js"></script>
<script type="text/javascript" src="../build/Three.js"></script>
<script type="text/javascript" src="../src/renderers/WebGLRenderer2.js"></script>
<script type="text/javascript" src="../src/extras/GeometryUtils.js"></script>
<script type="text/javascript" src="../src/extras/primitives/Plane.js"></script>
<script type="text/javascript">
var container, stats;
var camera, scene, renderer;
var mesh, texture;
var worldWidth = 256, worldDepth = 256,
worldHalfWidth = worldWidth / 2, worldHalfDepth = worldDepth / 2;
var mouseX = 0, mouseY = 0,
lat = 0, lon = 0, phy = 0, theta = 0;
var direction = new THREE.Vector3(),
moveForward = false, moveBackward = false;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
setInterval( loop, 1000 / 60 );
function init() {
container = document.getElementById( 'container' );
camera = new THREE.Camera( 60, window.innerWidth / window.innerHeight, 1, 750 );
camera.target.position.z = - 100;
scene = new THREE.Scene();
scene.fog = new THREE.Fog( 0xefd1b5, 1, 750 );
data = generateHeight( worldWidth, worldDepth );
camera.position.y = data[ worldHalfWidth + worldHalfDepth * worldWidth ] * 10 + 500;
camera.target.position.y = camera.position.y;
var geometry = new Plane( 7500, 7500, worldWidth - 1, worldDepth - 1 );
for ( var i = 0, l = geometry.vertices.length; i < l; i ++ ) {
geometry.vertices[ i ].position.z = data[ i ] * 10;
}
texture = new THREE.Texture( generateTexture( data, worldWidth, worldDepth ), new THREE.UVMapping(), THREE.ClampToEdgeWrapping, THREE.ClampToEdgeWrapping );
mesh = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { map: texture } ) );
mesh.rotation.x = - 90 * Math.PI / 180;
scene.addObject( mesh );
renderer = new THREE.WebGLRenderer2( false );
renderer.sortObjects = false;
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( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
}
function generateHeight( width, height ) {
var size = width * height, data = new Float32Array( size ),
perlin = new ImprovedNoise(), quality = 1, z = Math.random() * 100;
for ( var i = 0; i < size; i ++ ) {
data[ i ] = 0
}
for ( var j = 0; j < 4; j ++ ) {
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 ) * quality * 1.75 );
}
quality *= 5;
}
return data;
}
function generateTexture( data, width, height ) {
var canvas, canvasScaled, 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, canvas.width, canvas.height );
imageData = image.data;
for ( var 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
canvasScaled = document.createElement( 'canvas' );
canvasScaled.width = width * 4;
canvasScaled.height = height * 4;
canvasScaled.loaded = true;
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 ( var i = 0, l = imageData.length; i < l; i += 4 ) {
var v = ~~ ( Math.random() * 5 );
imageData[ i ] += v;
imageData[ i + 1 ] += v;
imageData[ i + 2 ] += v;
}
context.putImageData( image, 0, 0 );
return canvasScaled;
}
function onDocumentMouseDown( event ) {
event.preventDefault();
event.stopPropagation();
switch ( event.button ) {
case 0: moveForward = true; break;
case 2: moveBackward = true; break;
}
}
function onDocumentMouseUp( event ) {
event.preventDefault();
event.stopPropagation();
switch ( event.button ) {
case 0: moveForward = false; break;
case 2: moveBackward = false; break;
}
}
function onDocumentMouseMove(event) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function loop() {
if ( moveForward ) camera.translateZ( - 5 );
if ( moveBackward ) camera.translateZ( 5 );
lon += mouseX * 0.004;
lat -= mouseY * 0.004;
lat = Math.max( - 85, Math.min( 85, lat ) );
phi = ( 90 - lat ) * Math.PI / 180;
theta = lon * Math.PI / 180;
camera.target.position.x = 100 * Math.sin( phi ) * Math.cos( theta ) + camera.position.x;
camera.target.position.y = 100 * Math.cos( phi ) + camera.position.y;
camera.target.position.z = 100 * Math.sin( phi ) * Math.sin( theta ) + camera.position.z;
renderer.render(scene, camera);
stats.update();
}
</script>
</body>
</html>
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