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webgl_buffergeometry_instancing_dynamic.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - indexed instancing (single box), dynamic updates</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: #ffffff;
font-family: Monospace;
font-size: 13px;
text-align: center;
font-weight: bold;
background-color: #000000;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px;
width: 100%;
padding: 5px;
}
a {
color: #ffffff;
}
#oldie a {
color: #da0;
}
#notSupported {
width: 50%;
margin: auto;
border: 2px red solid;
margin-top: 20px;
padding: 10px;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info">
<a href="http://threejs.org" target="_blank">three.js</a> - indexed instancing (single box), dynamic updates
<div id="notSupported" style="display:none">Sorry your graphics card + browser does not support hardware instancing</div>
</div>
<script src="../build/three.min.js"></script>
<script src="js/Detector.js"></script>
<script src="js/libs/stats.min.js"></script>
<script id="vertexShader" type="x-shader/x-vertex">
precision highp float;
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
attribute vec3 position;
attribute vec3 offset;
attribute vec2 uv;
attribute vec4 orientation;
varying vec2 vUv;
void main() {
vec3 vPosition = position;
vec3 vcV = cross(orientation.xyz, vPosition);
vPosition = vcV * (2.0 * orientation.w) + (cross(orientation.xyz, vcV) * 2.0 + vPosition);
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( offset + vPosition, 1.0 );
}
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
precision highp float;
uniform sampler2D map;
varying vec2 vUv;
void main() {
gl_FragColor = texture2D(map, vUv);
}
</script>
<script>
if ( !Detector.webgl ) Detector.addGetWebGLMessage();
var container, stats;
var camera, scene, renderer;
var orientations;
function init() {
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
//camera.position.z = 20;
renderer = new THREE.WebGLRenderer();
scene = new THREE.Scene();
// geometry
var instances = 5000;
var geometry = new THREE.InstancedBufferGeometry();
// per mesh data
var vertices = new THREE.BufferAttribute( new Float32Array( [
// Front
-1, 1, 1,
1, 1, 1,
-1, -1, 1,
1, -1, 1,
// Back
1, 1, -1,
-1, 1, -1,
1, -1, -1,
-1, -1, -1,
// Left
-1, 1, -1,
-1, 1, 1,
-1, -1, -1,
-1, -1, 1,
// Right
1, 1, 1,
1, 1, -1,
1, -1, 1,
1, -1, -1,
// Top
-1, 1, 1,
1, 1, 1,
-1, 1, -1,
1, 1, -1,
// Bottom
1, -1, 1,
-1, -1, 1,
1, -1, -1,
-1, -1, -1
] ), 3 );
geometry.addAttribute( 'position', vertices );
var uvs = new THREE.BufferAttribute( new Float32Array( [
//x y z
// Front
0, 0,
1, 0,
0, 1,
1, 1,
// Back
1, 0,
0, 0,
1, 1,
0, 1,
// Left
1, 1,
1, 0,
0, 1,
0, 0,
// Right
1, 0,
1, 1,
0, 0,
0, 1,
// Top
0, 0,
1, 0,
0, 1,
1, 1,
// Bottom
1, 0,
0, 0,
1, 1,
0, 1
] ), 2 );
geometry.addAttribute( 'uv', uvs );
var indices = new Uint16Array( [
0, 1, 2,
2, 1, 3,
4, 5, 6,
6, 5, 7,
8, 9, 10,
10, 9, 11,
12, 13, 14,
14, 13, 15,
16, 17, 18,
18, 17, 19,
20, 21, 22,
22, 21, 23
] );
geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
// per instance data
var offsets = new THREE.InstancedBufferAttribute( new Float32Array( instances * 3 ), 3, 1 );
var vector = new THREE.Vector4();
for ( var i = 0, ul = offsets.count; i < ul; i++ ) {
var x = Math.random() * 100 - 50;
var y = Math.random() * 100 - 50;
var z = Math.random() * 100 - 50;
vector.set( x, y, z, 0 ).normalize();
// move out at least 5 units from center in current direction
offsets.setXYZ( i, x + vector.x * 5, y + vector.y * 5, z + vector.z * 5 );
}
geometry.addAttribute( 'offset', offsets ); // per mesh translation
orientations = new THREE.InstancedBufferAttribute( new Float32Array( instances * 4 ), 4, 1 ).setDynamic( true );
for ( var i = 0, ul = orientations.count; i < ul; i++ ) {
vector.set( Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1 );
vector.normalize();
orientations.setXYZW( i, vector.x, vector.y, vector.z, vector.w );
}
geometry.addAttribute( 'orientation', orientations ); // per mesh orientation
// material
var texture = new THREE.TextureLoader().load( 'textures/crate.gif' );
texture.anisotropy = renderer.getMaxAnisotropy();
var material = new THREE.RawShaderMaterial( {
uniforms: {
map: { type: "t", value: texture }
},
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
side: THREE.DoubleSide,
transparent: false
} );
var mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
if ( renderer.extensions.get( 'ANGLE_instanced_arrays' ) === false ) {
document.getElementById( "notSupported" ).style.display = "";
return;
}
renderer.setClearColor( 0x101010 );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize( event ) {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
var lastTime = 0;
var moveQ = ( new THREE.Quaternion( .5, .5, .5, 0.0 ) ).normalize();
var tmpQ = new THREE.Quaternion();
var currentQ = new THREE.Quaternion();
function render() {
var time = performance.now();
var object = scene.children[0];
object.rotation.y = time * 0.00005;
renderer.render( scene, camera );
var delta = ( time - lastTime ) / 5000;
tmpQ.set( moveQ.x * delta, moveQ.y * delta, moveQ.z * delta, 1 ).normalize();
for ( var i = 0, ul = orientations.count; i < ul; i++ ) {
var index = i * 4;
currentQ.set( orientations.array[index], orientations.array[index + 1], orientations.array[index + 2], orientations.array[index + 3] );
currentQ.multiply( tmpQ );
orientations.setXYZW( i, currentQ.x, currentQ.y, currentQ.z, currentQ.w );
}
orientations.needsUpdate = true;
lastTime = time;
}
init();
animate();
</script>
</body>
</html>