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webgl_modifier_curve_instanced.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - curve modifier - instanced</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> webgl - curve modifier - instanced
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.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 { InstancedFlow } from 'three/addons/modifiers/CurveModifier.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();
animate();
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 boxGeometry = new THREE.BoxGeometry( 0.1, 0.1, 0.1 );
const boxMaterial = new THREE.MeshBasicMaterial();
const curves = [[
{ x: 1, y: - 0.5, z: - 1 },
{ x: 1, y: - 0.5, z: 1 },
{ x: - 1, y: - 0.5, z: 1 },
{ x: - 1, y: - 0.5, z: - 1 },
],
[
{ x: - 1, y: 0.5, z: - 1 },
{ x: - 1, y: 0.5, z: 1 },
{ x: 1, y: 0.5, z: 1 },
{ x: 1, y: 0.5, z: - 1 },
]].map( function ( curvePoints ) {
const curveVertices = curvePoints.map( function ( handlePos ) {
const handle = new THREE.Mesh( boxGeometry, boxMaterial );
handle.position.copy( handlePos );
curveHandles.push( handle );
scene.add( handle );
return handle.position;
} );
const curve = new THREE.CatmullRomCurve3( curveVertices );
curve.curveType = 'centripetal';
curve.closed = true;
const points = curve.getPoints( 50 );
const line = new THREE.LineLoop(
new THREE.BufferGeometry().setFromPoints( points ),
new THREE.LineBasicMaterial( { color: 0x00ff00 } )
);
scene.add( line );
return {
curve,
line
};
} );
//
const light = new THREE.DirectionalLight( 0xffaa33 );
light.position.set( - 10, 10, 10 );
light.intensity = 1.0;
scene.add( light );
const light2 = new THREE.AmbientLight( 0x003973 );
light2.intensity = 1.0;
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,
height: 0.05,
curveSegments: 12,
bevelEnabled: true,
bevelThickness: 0.02,
bevelSize: 0.01,
bevelOffset: 0,
bevelSegments: 5,
} );
geometry.rotateX( Math.PI );
const material = new THREE.MeshStandardMaterial( {
color: 0x99ffff
} );
const numberOfInstances = 8;
flow = new InstancedFlow( numberOfInstances, curves.length, geometry, material );
curves.forEach( function ( { curve }, i ) {
flow.updateCurve( i, curve );
scene.add( flow.object3D );
} );
for ( let i = 0; i < numberOfInstances; i ++ ) {
const curveIndex = i % curves.length;
flow.setCurve( i, curveIndex );
flow.moveIndividualAlongCurve( i, i * 1 / numberOfInstances );
flow.object3D.setColorAt( i, new THREE.Color( 0xffffff * Math.random() ) );
}
} );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
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 ) {
curves.forEach( function ( { curve, line }, i ) {
const points = curve.getPoints( 50 );
line.geometry.setFromPoints( points );
flow.updateCurve( i, 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() {
requestAnimationFrame( 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 );
}
}
if ( flow ) {
flow.moveAlongCurve( 0.001 );
}
render();
}
function render() {
renderer.render( scene, camera );
stats.update();
}
</script>
</body>
</html>