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258 lines
6.0 KiB
258 lines
6.0 KiB
2 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 - curve modifier - instanced</title>
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<meta charset="utf-8" />
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<meta
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name="viewport"
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content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0"
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/>
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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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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - curve modifier - instanced
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</div>
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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 { TransformControls } from 'three/addons/controls/TransformControls.js';
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import Stats from 'three/addons/libs/stats.module.js';
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import { InstancedFlow } from 'three/addons/modifiers/CurveModifier.js';
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import { FontLoader } from 'three/addons/loaders/FontLoader.js';
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import { TextGeometry } from 'three/addons/geometries/TextGeometry.js';
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const ACTION_SELECT = 1, ACTION_NONE = 0;
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const curveHandles = [];
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const mouse = new THREE.Vector2();
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let stats;
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let scene,
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camera,
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renderer,
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rayCaster,
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control,
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flow,
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action = ACTION_NONE;
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init();
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animate();
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function init() {
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scene = new THREE.Scene();
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camera = new THREE.PerspectiveCamera(
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40,
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window.innerWidth / window.innerHeight,
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1,
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1000
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);
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camera.position.set( 2, 2, 4 );
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camera.lookAt( scene.position );
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const boxGeometry = new THREE.BoxGeometry( 0.1, 0.1, 0.1 );
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const boxMaterial = new THREE.MeshBasicMaterial();
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const curves = [[
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{ x: 1, y: - 0.5, z: - 1 },
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{ x: 1, y: - 0.5, z: 1 },
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{ x: - 1, y: - 0.5, z: 1 },
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{ x: - 1, y: - 0.5, z: - 1 },
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],
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[
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{ x: - 1, y: 0.5, z: - 1 },
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{ x: - 1, y: 0.5, z: 1 },
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{ x: 1, y: 0.5, z: 1 },
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{ x: 1, y: 0.5, z: - 1 },
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]].map( function ( curvePoints ) {
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const curveVertices = curvePoints.map( function ( handlePos ) {
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const handle = new THREE.Mesh( boxGeometry, boxMaterial );
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handle.position.copy( handlePos );
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curveHandles.push( handle );
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scene.add( handle );
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return handle.position;
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} );
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const curve = new THREE.CatmullRomCurve3( curveVertices );
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curve.curveType = 'centripetal';
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curve.closed = true;
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const points = curve.getPoints( 50 );
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const line = new THREE.LineLoop(
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new THREE.BufferGeometry().setFromPoints( points ),
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new THREE.LineBasicMaterial( { color: 0x00ff00 } )
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);
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scene.add( line );
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return {
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curve,
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line
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};
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} );
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//
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const light = new THREE.DirectionalLight( 0xffaa33 );
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light.position.set( - 10, 10, 10 );
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light.intensity = 1.0;
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scene.add( light );
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const light2 = new THREE.AmbientLight( 0x003973 );
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light2.intensity = 1.0;
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scene.add( light2 );
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//
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const loader = new FontLoader();
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loader.load( 'fonts/helvetiker_regular.typeface.json', function ( font ) {
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const geometry = new TextGeometry( 'Hello three.js!', {
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font: font,
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size: 0.2,
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height: 0.05,
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curveSegments: 12,
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bevelEnabled: true,
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bevelThickness: 0.02,
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bevelSize: 0.01,
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bevelOffset: 0,
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bevelSegments: 5,
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} );
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geometry.rotateX( Math.PI );
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const material = new THREE.MeshStandardMaterial( {
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color: 0x99ffff
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} );
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const numberOfInstances = 8;
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flow = new InstancedFlow( numberOfInstances, curves.length, geometry, material );
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curves.forEach( function ( { curve }, i ) {
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flow.updateCurve( i, curve );
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scene.add( flow.object3D );
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} );
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for ( let i = 0; i < numberOfInstances; i ++ ) {
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const curveIndex = i % curves.length;
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flow.setCurve( i, curveIndex );
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flow.moveIndividualAlongCurve( i, i * 1 / numberOfInstances );
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flow.object3D.setColorAt( i, new THREE.Color( 0xffffff * Math.random() ) );
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}
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} );
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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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renderer.domElement.addEventListener( 'pointerdown', onPointerDown );
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rayCaster = new THREE.Raycaster();
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control = new TransformControls( camera, renderer.domElement );
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control.addEventListener( 'dragging-changed', function ( event ) {
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if ( ! event.value ) {
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curves.forEach( function ( { curve, line }, i ) {
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const points = curve.getPoints( 50 );
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line.geometry.setFromPoints( points );
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flow.updateCurve( i, curve );
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} );
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}
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} );
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stats = new Stats();
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document.body.appendChild( stats.dom );
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window.addEventListener( 'resize', onWindowResize );
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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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function onPointerDown( event ) {
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action = ACTION_SELECT;
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mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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}
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function animate() {
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requestAnimationFrame( animate );
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if ( action === ACTION_SELECT ) {
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rayCaster.setFromCamera( mouse, camera );
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action = ACTION_NONE;
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const intersects = rayCaster.intersectObjects( curveHandles, false );
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if ( intersects.length ) {
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const target = intersects[ 0 ].object;
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control.attach( target );
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scene.add( control );
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}
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}
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if ( flow ) {
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flow.moveAlongCurve( 0.001 );
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}
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render();
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}
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function render() {
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renderer.render( scene, camera );
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stats.update();
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}
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</script>
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</body>
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</html>
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