mirror of
https://github.com/wahyd4/three.js.git
synced 2026-08-09 13:06:01 +10:00
239 lines
5.4 KiB
HTML
239 lines
5.4 KiB
HTML
<!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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background-color: #bfd1e5;
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margin: 0px;
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overflow: hidden;
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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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a {
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color: #b07861;
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}
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</style>
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</head>
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<body>
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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. <a href="geometry_terrain.html">generate another</a></div>
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<script type="text/javascript" src="js/Stats.js"></script>
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<script type="text/javascript" src="js/ImprovedNoise.js"></script>
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<script type="text/javascript" src="../build/Three.js"></script>
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<script type="text/javascript" src="../src/extras/primitives/Plane.js"></script>
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<script type="text/javascript">
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var container, stats;
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var camera, scene, renderer;
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var mesh;
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var mouseX = 0;
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var mouseY = 0;
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var windowHalfX = window.innerWidth / 2;
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var windowHalfY = window.innerHeight / 2;
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init();
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setInterval( loop, 1000 / 60 );
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function init() {
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container = document.getElementById( 'container' );
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camera = new THREE.Camera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.z = 500;
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scene = new THREE.Scene();
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var heightMap = height( 1024, 1024 );
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var texture = new THREE.Texture( shadow( heightMap ) );
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texture.image.loaded = true;
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var material = new THREE.MeshBasicMaterial( { map: texture } );
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var quality = 20;
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var quality1 = quality + 1;
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var plane = new Plane( 2000, 2000, quality, quality );
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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 / quality );
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for ( var y = 0; y < quality1; y++ ) {
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for (var x = 0; x < quality1; x++ ) {
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plane.vertices[x + y * quality1].position.z = data[((x * pixelsPerTriangle) + (y * pixelsPerTriangle) * heightMap.width) * 4] * 2 - 128;
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}
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}
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plane.computeNormals();
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plane.computeCentroids();
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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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mesh.overdraw = true;
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scene.addObject(mesh);
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renderer = new THREE.CanvasRenderer();
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renderer.setSize( window.innerWidth, window.innerHeight );
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container.innerHTML = "";
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container.appendChild( renderer.domElement );
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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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document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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}
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function onDocumentMouseMove(event) {
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mouseX = event.clientX - windowHalfX;
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mouseY = event.clientY - windowHalfY;
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}
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function loop() {
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camera.position.x += ( mouseX - camera.position.x ) * 0.05;
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camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
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renderer.render(scene, camera);
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stats.update();
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}
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function height( width, height ) {
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var canvas, context, image, data;
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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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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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image = context.getImageData( 0, 0, width, height );
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data = image.data;
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var perlin = new ImprovedNoise();
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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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for ( var j = 0; j < 4; j ++ ) {
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var x = 0, y = 0, yy = 0;
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quality *= 4;
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for ( var i = 0; i < size; i ++ ) {
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data[ i * 4 ] += Math.floor( Math.abs( perlin.noise( x / quality, yy, zz ) * 0.5 ) * quality + 10 );
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x++;
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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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context.putImageData( image, 0, 0 );
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return canvas;
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}
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function shadow( texture ) {
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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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vector3, sun, shade;
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vector3 = new THREE.Vector3( 0, 0, 0 );
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sun = new THREE.Vector3( 1, 1, 1 );
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sun.normalize();
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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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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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image = context.getImageData( 0, 0, width, height );
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data = image.data;
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src_data = texture.getContext( '2d' ).getImageData( 0, 0, width, height ).data;
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for ( var y = 0; y < height; y++ ) {
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for ( var x = 0; x < width; x++ ) {
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index = ( x + y * width ) * 4;
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vector3.x = src_data[ index - 4 ] - src_data[ index + 4 ];
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vector3.y = 2;
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vector3.z = src_data[ index - ( width * 4 ) ] - src_data[ index + ( width * 4 ) ];
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vector3.normalize();
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shade = vector3.dot(sun);
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data[ index ] = ( 96 + shade * 128 ) * ( src_data[ index ] * 0.007 );
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data[ index + 1 ] = ( 32 + shade * 96 ) * ( src_data[ index ] * 0.007 );
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data[ index + 2 ] = ( shade * 96 ) * ( src_data[ index ] * 0.007 );
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}
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}
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context.putImageData( image, 0, 0 );
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return canvas;
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}
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</script>
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</body>
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</html>
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