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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - buffergeometry - indexed</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: #cccccc;
font-family:Monospace;
font-size:13px;
text-align:center;
background-color: #050505;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
a {
color: #0080ff;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry - indexed</div>
<script src="../build/three.js"></script>
<script src="js/WebGL.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="./js/libs/dat.gui.min.js"></script>
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var camera, scene, renderer, stats;
var mesh;
init();
animate();
function init() {
//
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
camera.position.z = 64;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x050505 );
//
var ambientLight = new THREE.AmbientLight( 0x222222 );
scene.add( ambientLight );
var light1 = new THREE.DirectionalLight( 0xffffff, 0.5 );
light1.position.set( 1, 1, 1 );
scene.add( light1 );
var light2 = new THREE.DirectionalLight( 0xffffff, 1 );
light2.position.set( 0, - 1, 0 );
scene.add( light2 );
//
var geometry = new THREE.BufferGeometry();
var indices = [];
var vertices = [];
var normals = [];
var colors = [];
var size = 20;
var segments = 10;
var halfSize = size / 2;
var segmentSize = size / segments;
// generate vertices, normals and color data for a simple grid geometry
for ( var i = 0; i <= segments; i ++ ) {
var y = ( i * segmentSize ) - halfSize;
for ( var j = 0; j <= segments; j ++ ) {
var x = ( j * segmentSize ) - halfSize;
vertices.push( x, - y, 0 );
normals.push( 0, 0, 1 );
var r = ( x / size ) + 0.5;
var g = ( y / size ) + 0.5;
colors.push( r, g, 1 );
}
}
// generate indices (data for element array buffer)
for ( var i = 0; i < segments; i ++ ) {
for ( var j = 0; j < segments; j ++ ) {
var a = i * ( segments + 1 ) + ( j + 1 );
var b = i * ( segments + 1 ) + j;
var c = ( i + 1 ) * ( segments + 1 ) + j;
var d = ( i + 1 ) * ( segments + 1 ) + ( j + 1 );
// generate two faces (triangles) per iteration
indices.push( a, b, d ); // face one
indices.push( b, c, d ); // face two
}
}
//
geometry.setIndex( indices );
geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
geometry.addAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ) );
geometry.addAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
var material = new THREE.MeshPhongMaterial( {
specular: 0x111111, shininess: 250,
side: THREE.DoubleSide, vertexColors: THREE.VertexColors
} );
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
//
stats = new Stats();
document.body.appendChild( stats.dom );
//
var gui = new dat.GUI();
gui.add( material, 'wireframe' );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
var time = Date.now() * 0.001;
mesh.rotation.x = time * 0.25;
mesh.rotation.y = time * 0.5;
renderer.render( scene, camera );
}
</script>
</body>
</html>