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webgl_interactive_cubes_gpu.html
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webgl_interactive_cubes_gpu.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - interactive cubes (gpu)</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<link type="text/css" rel="stylesheet" href="main.css">
<style>
body {
background-color: #fff;
color: #444;
}
a {
color: #08f;
}
</style>
</head>
<body>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - gpu picking
</div>
<div id="container"></div>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
import { TrackballControls } from 'three/addons/controls/TrackballControls.js';
import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
let container, stats;
let camera, controls, scene, renderer;
let pickingTexture, pickingScene;
let highlightBox;
const pickingData = [];
const pointer = new THREE.Vector2();
const offset = new THREE.Vector3( 10, 10, 10 );
const clearColor = new THREE.Color();
init();
function init() {
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 1000;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0xffffff );
scene.add( new THREE.AmbientLight( 0xcccccc ) );
const light = new THREE.DirectionalLight( 0xffffff, 3 );
light.position.set( 0, 500, 2000 );
scene.add( light );
const defaultMaterial = new THREE.MeshPhongMaterial( {
color: 0xffffff,
flatShading: true,
vertexColors: true,
shininess: 0
} );
// set up the picking texture to use a 32 bit integer so we can write and read integer ids from it
pickingScene = new THREE.Scene();
pickingTexture = new THREE.WebGLRenderTarget( 1, 1, {
type: THREE.IntType,
format: THREE.RGBAIntegerFormat,
internalFormat: 'RGBA32I',
} );
const pickingMaterial = new THREE.ShaderMaterial( {
glslVersion: THREE.GLSL3,
vertexShader: /* glsl */`
attribute int id;
flat varying int vid;
void main() {
vid = id;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}
`,
fragmentShader: /* glsl */`
layout(location = 0) out int out_id;
flat varying int vid;
void main() {
out_id = vid;
}
`,
} );
function applyId( geometry, id ) {
const position = geometry.attributes.position;
const array = new Int16Array( position.count );
array.fill( id );
const bufferAttribute = new THREE.Int16BufferAttribute( array, 1, false );
bufferAttribute.gpuType = THREE.IntType;
geometry.setAttribute( 'id', bufferAttribute );
}
function applyVertexColors( geometry, color ) {
const position = geometry.attributes.position;
const colors = [];
for ( let i = 0; i < position.count; i ++ ) {
colors.push( color.r, color.g, color.b );
}
geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
}
const geometries = [];
const matrix = new THREE.Matrix4();
const quaternion = new THREE.Quaternion();
const color = new THREE.Color();
for ( let i = 0; i < 5000; i ++ ) {
const geometry = new THREE.BoxGeometry();
const position = new THREE.Vector3();
position.x = Math.random() * 10000 - 5000;
position.y = Math.random() * 6000 - 3000;
position.z = Math.random() * 8000 - 4000;
const rotation = new THREE.Euler();
rotation.x = Math.random() * 2 * Math.PI;
rotation.y = Math.random() * 2 * Math.PI;
rotation.z = Math.random() * 2 * Math.PI;
const scale = new THREE.Vector3();
scale.x = Math.random() * 200 + 100;
scale.y = Math.random() * 200 + 100;
scale.z = Math.random() * 200 + 100;
quaternion.setFromEuler( rotation );
matrix.compose( position, quaternion, scale );
geometry.applyMatrix4( matrix );
// give the geometry's vertices a random color to be displayed and an integer
// identifier as a vertex attribute so boxes can be identified after being merged.
applyVertexColors( geometry, color.setHex( Math.random() * 0xffffff ) );
applyId( geometry, i );
geometries.push( geometry );
pickingData[ i ] = {
position: position,
rotation: rotation,
scale: scale
};
}
const mergedGeometry = BufferGeometryUtils.mergeGeometries( geometries );
scene.add( new THREE.Mesh( mergedGeometry, defaultMaterial ) );
pickingScene.add( new THREE.Mesh( mergedGeometry, pickingMaterial ) );
highlightBox = new THREE.Mesh(
new THREE.BoxGeometry(),
new THREE.MeshLambertMaterial( { color: 0xffff00 } )
);
scene.add( highlightBox );
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
container.appendChild( renderer.domElement );
controls = new TrackballControls( camera, renderer.domElement );
controls.rotateSpeed = 1.0;
controls.zoomSpeed = 1.2;
controls.panSpeed = 0.8;
controls.noZoom = false;
controls.noPan = false;
controls.staticMoving = true;
controls.dynamicDampingFactor = 0.3;
stats = new Stats();
container.appendChild( stats.dom );
renderer.domElement.addEventListener( 'pointermove', onPointerMove );
}
//
function onPointerMove( e ) {
pointer.x = e.clientX;
pointer.y = e.clientY;
}
function animate() {
render();
stats.update();
}
function pick() {
// render the picking scene off-screen
// set the view offset to represent just a single pixel under the mouse
const dpr = window.devicePixelRatio;
camera.setViewOffset(
renderer.domElement.width, renderer.domElement.height,
Math.floor( pointer.x * dpr ), Math.floor( pointer.y * dpr ),
1, 1
);
// render the scene
renderer.setRenderTarget( pickingTexture );
// clear the background to - 1 meaning no item was hit
clearColor.setRGB( - 1, - 1, - 1 );
renderer.setClearColor( clearColor );
renderer.render( pickingScene, camera );
// clear the view offset so rendering returns to normal
camera.clearViewOffset();
// create buffer for reading single pixel
const pixelBuffer = new Int32Array( 4 );
// read the pixel
renderer
.readRenderTargetPixelsAsync( pickingTexture, 0, 0, 1, 1, pixelBuffer )
.then( () => {
const id = pixelBuffer[ 0 ];
if ( id !== - 1 ) {
// move our highlightBox so that it surrounds the picked object
const data = pickingData[ id ];
highlightBox.position.copy( data.position );
highlightBox.rotation.copy( data.rotation );
highlightBox.scale.copy( data.scale ).add( offset );
highlightBox.visible = true;
} else {
highlightBox.visible = false;
}
} );
}
function render() {
controls.update();
pick();
renderer.setRenderTarget( null );
renderer.render( scene, camera );
}
</script>
</body>
</html>