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323 lines
7.7 KiB
323 lines
7.7 KiB
3 years ago
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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 - instancing - scatter</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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</head>
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<body>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { MeshSurfaceSampler } from 'three/addons/math/MeshSurfaceSampler.js';
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import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
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import Stats from 'three/addons/libs/stats.module.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let camera, scene, renderer, stats;
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const api = {
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count: 2000,
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distribution: 'random',
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resample: resample,
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surfaceColor: 0xFFF784,
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backgroundColor: 0xE39469,
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};
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let stemMesh, blossomMesh;
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let stemGeometry, blossomGeometry;
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let stemMaterial, blossomMaterial;
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let sampler;
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const count = api.count;
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const ages = new Float32Array( count );
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const scales = new Float32Array( count );
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const dummy = new THREE.Object3D();
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const _position = new THREE.Vector3();
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const _normal = new THREE.Vector3();
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const _scale = new THREE.Vector3();
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// let surfaceGeometry = new THREE.BoxGeometry( 10, 10, 10 ).toNonIndexed();
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const surfaceGeometry = new THREE.TorusKnotGeometry( 10, 3, 100, 16 ).toNonIndexed();
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const surfaceMaterial = new THREE.MeshLambertMaterial( { color: api.surfaceColor, wireframe: false } );
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const surface = new THREE.Mesh( surfaceGeometry, surfaceMaterial );
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// Source: https://gist.github.com/gre/1650294
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const easeOutCubic = function ( t ) {
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return ( -- t ) * t * t + 1;
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};
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// Scaling curve causes particles to grow quickly, ease gradually into full scale, then
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// disappear quickly. More of the particle's lifetime is spent around full scale.
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const scaleCurve = function ( t ) {
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return Math.abs( easeOutCubic( ( t > 0.5 ? 1 - t : t ) * 2 ) );
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};
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const loader = new GLTFLoader();
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loader.load( './models/gltf/Flower/Flower.glb', function ( gltf ) {
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const _stemMesh = gltf.scene.getObjectByName( 'Stem' );
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const _blossomMesh = gltf.scene.getObjectByName( 'Blossom' );
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stemGeometry = _stemMesh.geometry.clone();
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blossomGeometry = _blossomMesh.geometry.clone();
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const defaultTransform = new THREE.Matrix4()
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.makeRotationX( Math.PI )
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.multiply( new THREE.Matrix4().makeScale( 7, 7, 7 ) );
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stemGeometry.applyMatrix4( defaultTransform );
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blossomGeometry.applyMatrix4( defaultTransform );
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stemMaterial = _stemMesh.material;
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blossomMaterial = _blossomMesh.material;
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stemMesh = new THREE.InstancedMesh( stemGeometry, stemMaterial, count );
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blossomMesh = new THREE.InstancedMesh( blossomGeometry, blossomMaterial, count );
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// Assign random colors to the blossoms.
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const color = new THREE.Color();
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const blossomPalette = [ 0xF20587, 0xF2D479, 0xF2C879, 0xF2B077, 0xF24405 ];
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for ( let i = 0; i < count; i ++ ) {
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color.setHex( blossomPalette[ Math.floor( Math.random() * blossomPalette.length ) ] );
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blossomMesh.setColorAt( i, color );
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}
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// Instance matrices will be updated every frame.
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stemMesh.instanceMatrix.setUsage( THREE.DynamicDrawUsage );
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blossomMesh.instanceMatrix.setUsage( THREE.DynamicDrawUsage );
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resample();
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init();
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animate();
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} );
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function init() {
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camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
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camera.position.set( 25, 25, 25 );
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camera.lookAt( 0, 0, 0 );
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//
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scene = new THREE.Scene();
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scene.background = new THREE.Color( api.backgroundColor );
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const pointLight = new THREE.PointLight( 0xAA8899, 0.75 );
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pointLight.position.set( 50, - 25, 75 );
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scene.add( pointLight );
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scene.add( new THREE.HemisphereLight() );
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//
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scene.add( stemMesh );
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scene.add( blossomMesh );
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scene.add( surface );
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//
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const gui = new GUI();
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gui.add( api, 'count', 0, count ).onChange( function () {
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stemMesh.count = api.count;
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blossomMesh.count = api.count;
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} );
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// gui.addColor( api, 'backgroundColor' ).onChange( function () {
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// scene.background.setHex( api.backgroundColor );
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// } );
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// gui.addColor( api, 'surfaceColor' ).onChange( function () {
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// surfaceMaterial.color.setHex( api.surfaceColor );
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// } );
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gui.add( api, 'distribution' ).options( [ 'random', 'weighted' ] ).onChange( resample );
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gui.add( api, 'resample' );
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//
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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//
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stats = new Stats();
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document.body.appendChild( stats.dom );
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//
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window.addEventListener( 'resize', onWindowResize );
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}
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function resample() {
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const vertexCount = surface.geometry.getAttribute( 'position' ).count;
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console.info( 'Sampling ' + count + ' points from a surface with ' + vertexCount + ' vertices...' );
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//
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console.time( '.build()' );
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sampler = new MeshSurfaceSampler( surface )
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.setWeightAttribute( api.distribution === 'weighted' ? 'uv' : null )
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.build();
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console.timeEnd( '.build()' );
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//
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console.time( '.sample()' );
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for ( let i = 0; i < count; i ++ ) {
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ages[ i ] = Math.random();
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scales[ i ] = scaleCurve( ages[ i ] );
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resampleParticle( i );
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}
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console.timeEnd( '.sample()' );
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stemMesh.instanceMatrix.needsUpdate = true;
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blossomMesh.instanceMatrix.needsUpdate = true;
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}
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function resampleParticle( i ) {
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sampler.sample( _position, _normal );
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_normal.add( _position );
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dummy.position.copy( _position );
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dummy.scale.set( scales[ i ], scales[ i ], scales[ i ] );
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dummy.lookAt( _normal );
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dummy.updateMatrix();
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stemMesh.setMatrixAt( i, dummy.matrix );
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blossomMesh.setMatrixAt( i, dummy.matrix );
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}
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function updateParticle( i ) {
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// Update lifecycle.
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ages[ i ] += 0.005;
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if ( ages[ i ] >= 1 ) {
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ages[ i ] = 0.001;
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scales[ i ] = scaleCurve( ages[ i ] );
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resampleParticle( i );
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return;
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}
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// Update scale.
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const prevScale = scales[ i ];
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scales[ i ] = scaleCurve( ages[ i ] );
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_scale.set( scales[ i ] / prevScale, scales[ i ] / prevScale, scales[ i ] / prevScale );
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// Update transform.
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stemMesh.getMatrixAt( i, dummy.matrix );
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dummy.matrix.scale( _scale );
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stemMesh.setMatrixAt( i, dummy.matrix );
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blossomMesh.setMatrixAt( i, dummy.matrix );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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if ( stemMesh && blossomMesh ) {
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const time = Date.now() * 0.001;
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scene.rotation.x = Math.sin( time / 4 );
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scene.rotation.y = Math.sin( time / 2 );
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for ( let i = 0; i < api.count; i ++ ) {
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updateParticle( i );
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}
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stemMesh.instanceMatrix.needsUpdate = true;
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blossomMesh.instanceMatrix.needsUpdate = true;
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}
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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