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2 years ago
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - custom attributes [lines]</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> - custom attributes example</div>
<div id="container"></div>
<script type="x-shader/x-vertex" id="vertexshader">
uniform float amplitude;
attribute vec3 displacement;
attribute vec3 customColor;
varying vec3 vColor;
void main() {
vec3 newPosition = position + amplitude * displacement;
vColor = customColor;
gl_Position = projectionMatrix * modelViewMatrix * vec4( newPosition, 1.0 );
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
uniform float opacity;
varying vec3 vColor;
void main() {
gl_FragColor = vec4( vColor * color, opacity );
}
</script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/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 { FontLoader } from 'three/addons/loaders/FontLoader.js';
import { TextGeometry } from 'three/addons/geometries/TextGeometry.js';
import Stats from 'three/addons/libs/stats.module.js';
let renderer, scene, camera, stats;
let line, uniforms;
const loader = new FontLoader();
loader.load( 'fonts/helvetiker_bold.typeface.json', function ( font ) {
init( font );
animate();
} );
function init( font ) {
camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 400;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x050505 );
uniforms = {
amplitude: { value: 5.0 },
opacity: { value: 0.3 },
color: { value: new THREE.Color( 0xffffff ) }
};
const shaderMaterial = new THREE.ShaderMaterial( {
uniforms: uniforms,
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
blending: THREE.AdditiveBlending,
depthTest: false,
transparent: true
} );
const geometry = new TextGeometry( 'three.js', {
font: font,
size: 50,
height: 15,
curveSegments: 10,
bevelThickness: 5,
bevelSize: 1.5,
bevelEnabled: true,
bevelSegments: 10,
} );
geometry.center();
const count = geometry.attributes.position.count;
const displacement = new THREE.Float32BufferAttribute( count * 3, 3 );
geometry.setAttribute( 'displacement', displacement );
const customColor = new THREE.Float32BufferAttribute( count * 3, 3 );
geometry.setAttribute( 'customColor', customColor );
const color = new THREE.Color( 0xffffff );
for ( let i = 0, l = customColor.count; i < l; i ++ ) {
color.setHSL( i / l, 0.5, 0.5 );
color.toArray( customColor.array, i * customColor.itemSize );
}
line = new THREE.Line( geometry, shaderMaterial );
line.rotation.x = 0.2;
scene.add( line );
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
const container = document.getElementById( 'container' );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
const time = Date.now() * 0.001;
line.rotation.y = 0.25 * time;
uniforms.amplitude.value = Math.sin( 0.5 * time );
uniforms.color.value.offsetHSL( 0.0005, 0, 0 );
const attributes = line.geometry.attributes;
const array = attributes.displacement.array;
for ( let i = 0, l = array.length; i < l; i += 3 ) {
array[ i ] += 0.3 * ( 0.5 - Math.random() );
array[ i + 1 ] += 0.3 * ( 0.5 - Math.random() );
array[ i + 2 ] += 0.3 * ( 0.5 - Math.random() );
}
attributes.displacement.needsUpdate = true;
renderer.render( scene, camera );
}
</script>
</body>
</html>