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@@ -1,7 +1,7 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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- <title>three.js webgl - indexed instancing (single box), interleaved buffers, dynamic updates</title>
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+ <title>three.js webgl - indexed instancing (single box), interleaved buffers</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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@@ -22,68 +22,29 @@
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<div id="container"></div>
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<div id="info">
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- <a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - indexed instancing (single box)<br/>interleaved buffers, dynamic updates
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+ <a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - indexed instancing (single box), interleaved buffers
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<div id="notSupported" style="display:none">Sorry your graphics card + browser does not support hardware instancing</div>
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</div>
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- <script id="vertexShader" type="x-shader/x-vertex">
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- precision highp float;
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-
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- uniform mat4 modelViewMatrix;
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- uniform mat4 projectionMatrix;
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-
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- attribute vec3 position;
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- attribute vec3 offset;
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- attribute vec2 uv;
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- attribute vec4 orientation;
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-
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- varying vec2 vUv;
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-
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- // http://www.geeks3d.com/20141201/how-to-rotate-a-vertex-by-a-quaternion-in-glsl/
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-
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- vec3 applyQuaternionToVector( vec4 q, vec3 v ){
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-
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- return v + 2.0 * cross( q.xyz, cross( q.xyz, v ) + q.w * v );
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-
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- }
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-
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- void main() {
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-
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- vec3 vPosition = applyQuaternionToVector( orientation, position );
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-
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- vUv = uv;
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-
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- gl_Position = projectionMatrix * modelViewMatrix * vec4( offset + vPosition, 1.0 );
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-
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- }
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-
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- </script>
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-
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- <script id="fragmentShader" type="x-shader/x-fragment">
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- precision highp float;
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-
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- uniform sampler2D map;
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-
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- varying vec2 vUv;
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-
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- void main() {
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-
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- gl_FragColor = texture2D(map, vUv);
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-
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- }
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-
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- </script>
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-
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<script type="module">
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import * as THREE from '../build/three.module.js';
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import Stats from './jsm/libs/stats.module.js';
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var container, stats;
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+ var camera, scene, renderer, mesh;
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+ var offsetAttribute, orientationAttribute;
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+
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+ var instances = 5000;
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+ var lastTime = 0;
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- var camera, scene, renderer;
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- var orientations, instanceBuffer;
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+ var moveQ = new THREE.Quaternion( 0.5, 0.5, 0.5, 0.0 ).normalize();
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+ var tmpQ = new THREE.Quaternion();
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+ var tmpM = new THREE.Matrix4();
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+ var currentM = new THREE.Matrix4();
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+ init();
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+ animate();
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function init() {
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@@ -94,12 +55,8 @@
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0x101010 );
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- renderer = new THREE.WebGLRenderer();
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-
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// geometry
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- var instances = 5000;
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-
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var geometry = new THREE.InstancedBufferGeometry();
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// per mesh data x,y,z,w,u,v,s,t for 4-element alignment
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@@ -161,69 +118,63 @@
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geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
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- // per instance data
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- instanceBuffer = new THREE.InstancedInterleavedBuffer( new Float32Array( instances * 8 ), 8, 1 ).setUsage( THREE.DynamicDrawUsage );
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- var offsets = new THREE.InterleavedBufferAttribute( instanceBuffer, 3, 0 );
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+ // material
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- var vector = new THREE.Vector4();
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- for ( var i = 0, ul = offsets.count; i < ul; i ++ ) {
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+ var material = new THREE.MeshBasicMaterial();
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+ material.map = new THREE.TextureLoader().load( 'textures/crate.gif' );
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+ material.side = THREE.DoubleSide;
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- var x = Math.random() * 100 - 50;
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- var y = Math.random() * 100 - 50;
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- var z = Math.random() * 100 - 50;
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- vector.set( x, y, z, 0 ).normalize();
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- // move out at least 5 units from center in current direction
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- offsets.setXYZ( i, x + vector.x * 5, y + vector.y * 5, z + vector.z * 5 );
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+ // per instance data
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- }
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+ var matrix = new THREE.Matrix4();
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+ var offset = new THREE.Vector3();
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+ var orientation = new THREE.Quaternion();
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+ var scale = new THREE.Vector3( 1, 1, 1 );
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+ var x, y, z, w;
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- geometry.setAttribute( 'offset', offsets ); // per mesh translation
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+ mesh = new THREE.InstancedMesh( geometry, material, instances );
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- orientations = new THREE.InterleavedBufferAttribute( instanceBuffer, 4, 4 );
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+ for ( var i = 0; i < instances; i ++ ) {
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- for ( var i = 0, ul = orientations.count; i < ul; i ++ ) {
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+ // offsets
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- vector.set( Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1 );
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- vector.normalize();
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+ x = Math.random() * 100 - 50;
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+ y = Math.random() * 100 - 50;
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+ z = Math.random() * 100 - 50;
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- orientations.setXYZW( i, vector.x, vector.y, vector.z, vector.w );
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+ offset.set( x, y, z ).normalize();
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+ offset.multiplyScalar( 5 ); // move out at least 5 units from center in current direction
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+ offset.set( x + offset.x, y + offset.y, z + offset.z );
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- }
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+ // orientations
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- geometry.setAttribute( 'orientation', orientations ); // per mesh orientation
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+ x = Math.random() * 2 - 1;
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+ y = Math.random() * 2 - 1;
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+ z = Math.random() * 2 - 1;
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+ w = Math.random() * 2 - 1;
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- // material
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- var texture = new THREE.TextureLoader().load( 'textures/crate.gif' );
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- texture.anisotropy = renderer.capabilities.getMaxAnisotropy();
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+ orientation.set( x, y, z, w ).normalize();
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- var material = new THREE.RawShaderMaterial( {
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+ matrix.compose( offset, orientation, scale );
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- uniforms: {
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- map: { value: texture }
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- },
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- vertexShader: document.getElementById( 'vertexShader' ).textContent,
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- fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
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- side: THREE.DoubleSide,
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- transparent: false
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+ mesh.setMatrixAt( i, matrix );
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- } );
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+ }
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- var mesh = new THREE.Mesh( geometry, material );
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- mesh.frustumCulled = false;
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scene.add( mesh );
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+ renderer = new THREE.WebGLRenderer();
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ container.appendChild( renderer.domElement );
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if ( renderer.extensions.get( 'ANGLE_instanced_arrays' ) === null ) {
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- document.getElementById( "notSupported" ).style.display = "";
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+ document.getElementById( 'notSupported' ).style.display = '';
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return;
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}
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- renderer.setPixelRatio( window.devicePixelRatio );
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- renderer.setSize( window.innerWidth, window.innerHeight );
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- container.appendChild( renderer.domElement );
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-
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stats = new Stats();
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container.appendChild( stats.dom );
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@@ -251,44 +202,36 @@
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}
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- var lastTime = 0;
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-
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- var moveQ = ( new THREE.Quaternion( .5, .5, .5, 0.0 ) ).normalize();
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- var tmpQ = new THREE.Quaternion();
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- var currentQ = new THREE.Quaternion();
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function render() {
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var time = performance.now();
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-
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- var object = scene.children[ 0 ];
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-
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- object.rotation.y = time * 0.00005;
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-
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- renderer.render( scene, camera );
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+ mesh.rotation.y = time * 0.00005;
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var delta = ( time - lastTime ) / 5000;
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tmpQ.set( moveQ.x * delta, moveQ.y * delta, moveQ.z * delta, 1 ).normalize();
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+ tmpM.makeRotationFromQuaternion( tmpQ );
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- for ( var i = 0, ul = orientations.count; i < ul; i ++ ) {
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+ for ( var i = 0, il = instances; i < il; i ++ ) {
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- var index = i * instanceBuffer.stride + orientations.offset;
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- currentQ.set( instanceBuffer.array[ index ], instanceBuffer.array[ index + 1 ], instanceBuffer.array[ index + 2 ], instanceBuffer.array[ index + 3 ] );
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- currentQ.multiply( tmpQ );
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-
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- orientations.setXYZW( i, currentQ.x, currentQ.y, currentQ.z, currentQ.w );
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+ mesh.getMatrixAt( i, currentM );
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+ currentM.multiply( tmpM );
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+ mesh.setMatrixAt( i, currentM );
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}
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- instanceBuffer.needsUpdate = true;
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+
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+ mesh.instanceMatrix.needsUpdate = true;
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+
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lastTime = time;
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- }
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+ renderer.render( scene, camera );
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- init();
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- animate();
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+ }
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</script>
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</body>
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+
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+
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</html>
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Don McCurdy