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webgl_instancing_raycast.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - instancing - raycast</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">
</head>
<body>
<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 { GUI } from 'three/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
let camera, scene, renderer, controls, stats;
let mesh;
const amount = parseInt( window.location.search.slice( 1 ) ) || 10;
const count = Math.pow( amount, 3 );
const raycaster = new THREE.Raycaster();
const mouse = new THREE.Vector2( 1, 1 );
const color = new THREE.Color();
const white = new THREE.Color().setHex( 0xffffff );
init();
function init() {
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
camera.position.set( amount, amount, amount );
camera.lookAt( 0, 0, 0 );
scene = new THREE.Scene();
const light = new THREE.HemisphereLight( 0xffffff, 0x888888, 3 );
light.position.set( 0, 1, 0 );
scene.add( light );
const geometry = new THREE.IcosahedronGeometry( 0.5, 3 );
const material = new THREE.MeshPhongMaterial( { color: 0xffffff } );
mesh = new THREE.InstancedMesh( geometry, material, count );
let i = 0;
const offset = ( amount - 1 ) / 2;
const matrix = new THREE.Matrix4();
for ( let x = 0; x < amount; x ++ ) {
for ( let y = 0; y < amount; y ++ ) {
for ( let z = 0; z < amount; z ++ ) {
matrix.setPosition( offset - x, offset - y, offset - z );
mesh.setMatrixAt( i, matrix );
mesh.setColorAt( i, color );
i ++;
}
}
}
scene.add( mesh );
//
const gui = new GUI();
gui.add( mesh, 'count', 0, count );
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
document.body.appendChild( renderer.domElement );
controls = new OrbitControls( camera, renderer.domElement );
controls.enableDamping = true;
controls.enableZoom = false;
controls.enablePan = false;
stats = new Stats();
document.body.appendChild( stats.dom );
window.addEventListener( 'resize', onWindowResize );
document.addEventListener( 'mousemove', onMouseMove );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onMouseMove( event ) {
event.preventDefault();
mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
}
function animate() {
controls.update();
raycaster.setFromCamera( mouse, camera );
const intersection = raycaster.intersectObject( mesh );
if ( intersection.length > 0 ) {
const instanceId = intersection[ 0 ].instanceId;
mesh.getColorAt( instanceId, color );
if ( color.equals( white ) ) {
mesh.setColorAt( instanceId, color.setHex( Math.random() * 0xffffff ) );
mesh.instanceColor.needsUpdate = true;
}
}
renderer.render( scene, camera );
stats.update();
}
</script>
</body>
</html>