You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
241 lines
5.3 KiB
241 lines
5.3 KiB
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<title>three.js webgl - buffergeometry - uint</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 - uint</div>
|
|
|
|
<script src="../build/three.js"></script>
|
|
|
|
<script src="js/WebGL.js"></script>
|
|
<script src="js/libs/stats.min.js"></script>
|
|
|
|
<script>
|
|
|
|
if ( WEBGL.isWebGLAvailable() === false ) {
|
|
|
|
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
|
|
|
|
}
|
|
|
|
var container, stats;
|
|
|
|
var camera, scene, renderer;
|
|
|
|
var mesh;
|
|
|
|
init();
|
|
animate();
|
|
|
|
function init() {
|
|
|
|
container = document.getElementById( 'container' );
|
|
|
|
//
|
|
|
|
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
|
|
camera.position.z = 2750;
|
|
|
|
scene = new THREE.Scene();
|
|
scene.background = new THREE.Color( 0x050505 );
|
|
scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
|
|
|
|
//
|
|
|
|
scene.add( new THREE.AmbientLight( 0x444444 ) );
|
|
|
|
var light1 = new THREE.DirectionalLight( 0xffffff, 0.5 );
|
|
light1.position.set( 1, 1, 1 );
|
|
scene.add( light1 );
|
|
|
|
var light2 = new THREE.DirectionalLight( 0xffffff, 1.5 );
|
|
light2.position.set( 0, - 1, 0 );
|
|
scene.add( light2 );
|
|
|
|
//
|
|
|
|
var triangles = 500000;
|
|
|
|
var geometry = new THREE.BufferGeometry();
|
|
|
|
var positions = [];
|
|
var normals = [];
|
|
var colors = [];
|
|
|
|
var color = new THREE.Color();
|
|
|
|
var n = 800, n2 = n / 2; // triangles spread in the cube
|
|
var d = 12, d2 = d / 2; // individual triangle size
|
|
|
|
var pA = new THREE.Vector3();
|
|
var pB = new THREE.Vector3();
|
|
var pC = new THREE.Vector3();
|
|
|
|
var cb = new THREE.Vector3();
|
|
var ab = new THREE.Vector3();
|
|
|
|
for ( var i = 0; i < triangles; i ++ ) {
|
|
|
|
// positions
|
|
|
|
var x = Math.random() * n - n2;
|
|
var y = Math.random() * n - n2;
|
|
var z = Math.random() * n - n2;
|
|
|
|
var ax = x + Math.random() * d - d2;
|
|
var ay = y + Math.random() * d - d2;
|
|
var az = z + Math.random() * d - d2;
|
|
|
|
var bx = x + Math.random() * d - d2;
|
|
var by = y + Math.random() * d - d2;
|
|
var bz = z + Math.random() * d - d2;
|
|
|
|
var cx = x + Math.random() * d - d2;
|
|
var cy = y + Math.random() * d - d2;
|
|
var cz = z + Math.random() * d - d2;
|
|
|
|
positions.push( ax, ay, az );
|
|
positions.push( bx, by, bz );
|
|
positions.push( cx, cy, cz );
|
|
|
|
// flat face normals
|
|
|
|
pA.set( ax, ay, az );
|
|
pB.set( bx, by, bz );
|
|
pC.set( cx, cy, cz );
|
|
|
|
cb.subVectors( pC, pB );
|
|
ab.subVectors( pA, pB );
|
|
cb.cross( ab );
|
|
|
|
cb.normalize();
|
|
|
|
var nx = cb.x;
|
|
var ny = cb.y;
|
|
var nz = cb.z;
|
|
|
|
normals.push( nx * 32767, ny * 32767, nz * 32767 );
|
|
normals.push( nx * 32767, ny * 32767, nz * 32767 );
|
|
normals.push( nx * 32767, ny * 32767, nz * 32767 );
|
|
|
|
// colors
|
|
|
|
var vx = ( x / n ) + 0.5;
|
|
var vy = ( y / n ) + 0.5;
|
|
var vz = ( z / n ) + 0.5;
|
|
|
|
color.setRGB( vx, vy, vz );
|
|
|
|
colors.push( color.r * 255, color.g * 255, color.b * 255 );
|
|
colors.push( color.r * 255, color.g * 255, color.b * 255 );
|
|
colors.push( color.r * 255, color.g * 255, color.b * 255 );
|
|
|
|
}
|
|
|
|
var positionAttribute = new THREE.Float32BufferAttribute( positions, 3 );
|
|
var normalAttribute = new THREE.Int16BufferAttribute( normals, 3 );
|
|
var colorAttribute = new THREE.Uint8BufferAttribute( colors, 3 );
|
|
|
|
normalAttribute.normalized = true; // this will map the buffer values to 0.0f - +1.0f in the shader
|
|
colorAttribute.normalized = true;
|
|
|
|
geometry.addAttribute( 'position', positionAttribute );
|
|
geometry.addAttribute( 'normal', normalAttribute );
|
|
geometry.addAttribute( 'color', colorAttribute );
|
|
|
|
geometry.computeBoundingSphere();
|
|
|
|
var material = new THREE.MeshPhongMaterial( {
|
|
color: 0xaaaaaa, specular: 0xffffff, shininess: 250,
|
|
side: THREE.DoubleSide, vertexColors: THREE.VertexColors
|
|
} );
|
|
|
|
mesh = new THREE.Mesh( geometry, material );
|
|
scene.add( mesh );
|
|
|
|
//
|
|
|
|
renderer = new THREE.WebGLRenderer();
|
|
renderer.setPixelRatio( window.devicePixelRatio );
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
|
|
|
renderer.gammaInput = true;
|
|
renderer.gammaOutput = true;
|
|
|
|
container.appendChild( renderer.domElement );
|
|
|
|
//
|
|
|
|
stats = new Stats();
|
|
container.appendChild( stats.dom );
|
|
|
|
//
|
|
|
|
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>
|