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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgpu - curve modifier</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>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgpu - curve modifier
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.webgpu.js",
- "three/tsl": "../build/three.webgpu.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { TransformControls } from 'three/addons/controls/TransformControls.js';
- import Stats from 'three/addons/libs/stats.module.js';
- import { Flow } from 'three/addons/modifiers/CurveModifierGPU.js';
- import { FontLoader } from 'three/addons/loaders/FontLoader.js';
- import { TextGeometry } from 'three/addons/geometries/TextGeometry.js';
- const ACTION_SELECT = 1, ACTION_NONE = 0;
- const curveHandles = [];
- const mouse = new THREE.Vector2();
- let stats;
- let scene,
- camera,
- renderer,
- rayCaster,
- control,
- flow,
- action = ACTION_NONE;
- init();
- function init() {
- scene = new THREE.Scene();
- camera = new THREE.PerspectiveCamera(
- 40,
- window.innerWidth / window.innerHeight,
- 1,
- 1000
- );
- camera.position.set( 2, 2, 4 );
- camera.lookAt( scene.position );
- const initialPoints = [
- { x: 1, y: 0, z: - 1 },
- { x: 1, y: 0, z: 1 },
- { x: - 1, y: 0, z: 1 },
- { x: - 1, y: 0, z: - 1 },
- ];
- const boxGeometry = new THREE.BoxGeometry( 0.1, 0.1, 0.1 );
- const boxMaterial = new THREE.MeshBasicNodeMaterial();
- for ( const handlePos of initialPoints ) {
- const handle = new THREE.Mesh( boxGeometry, boxMaterial );
- handle.position.copy( handlePos );
- curveHandles.push( handle );
- scene.add( handle );
- }
- const curve = new THREE.CatmullRomCurve3(
- curveHandles.map( ( handle ) => handle.position )
- );
- curve.curveType = 'centripetal';
- curve.closed = true;
- const points = curve.getPoints( 50 );
- const line = new THREE.Line(
- new THREE.BufferGeometry().setFromPoints( points ),
- new THREE.LineBasicMaterial( { color: 0x00ff00 } )
- );
- scene.add( line );
- //
- const light = new THREE.DirectionalLight( 0xffaa33, 3 );
- light.position.set( - 10, 10, 10 );
- scene.add( light );
- const light2 = new THREE.AmbientLight( 0x003973, 3 );
- scene.add( light2 );
- //
- const loader = new FontLoader();
- loader.load( 'fonts/helvetiker_regular.typeface.json', function ( font ) {
- const geometry = new TextGeometry( 'Hello three.js!', {
- font: font,
- size: 0.2,
- depth: 0.05,
- curveSegments: 12,
- bevelEnabled: true,
- bevelThickness: 0.02,
- bevelSize: 0.01,
- bevelOffset: 0,
- bevelSegments: 5,
- } );
- geometry.rotateX( Math.PI );
- const material = new THREE.MeshStandardNodeMaterial( {
- color: 0x99ffff
- } );
- const objectToCurve = new THREE.Mesh( geometry, material );
- flow = new Flow( objectToCurve );
- flow.updateCurve( 0, curve );
- scene.add( flow.object3D );
- } );
- //
- renderer = new THREE.WebGPURenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- renderer.domElement.addEventListener( 'pointerdown', onPointerDown );
- rayCaster = new THREE.Raycaster();
- control = new TransformControls( camera, renderer.domElement );
- control.addEventListener( 'dragging-changed', function ( event ) {
- if ( ! event.value ) {
- const points = curve.getPoints( 50 );
- line.geometry.setFromPoints( points );
- flow.updateCurve( 0, curve );
- }
- } );
- stats = new Stats();
- document.body.appendChild( stats.dom );
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function onPointerDown( event ) {
- action = ACTION_SELECT;
- mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
- mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
- }
- function animate() {
- if ( action === ACTION_SELECT ) {
- rayCaster.setFromCamera( mouse, camera );
- action = ACTION_NONE;
- const intersects = rayCaster.intersectObjects( curveHandles, false );
- if ( intersects.length ) {
- const target = intersects[ 0 ].object;
- control.attach( target );
- scene.add( control.getHelper() );
- }
- }
- if ( flow ) {
- flow.moveAlongCurve( 0.001 );
- }
- render();
- }
- function render() {
- renderer.render( scene, camera );
- stats.update();
- }
- </script>
- </body>
- </html>
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