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webgl_buffergeometry_lines.html
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webgl_buffergeometry_lines.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - buffergeometry - 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="container"></div>
<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry - lines</div>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
let container, stats, clock;
let camera, scene, renderer;
let line;
const segments = 10000;
const r = 800;
let t = 0;
init();
function init() {
container = document.getElementById( 'container' );
//
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 4000 );
camera.position.z = 2750;
scene = new THREE.Scene();
clock = new THREE.Clock();
const geometry = new THREE.BufferGeometry();
const material = new THREE.LineBasicMaterial( { vertexColors: true } );
const positions = [];
const colors = [];
for ( let i = 0; i < segments; i ++ ) {
const x = Math.random() * r - r / 2;
const y = Math.random() * r - r / 2;
const z = Math.random() * r - r / 2;
// positions
positions.push( x, y, z );
// colors
colors.push( ( x / r ) + 0.5 );
colors.push( ( y / r ) + 0.5 );
colors.push( ( z / r ) + 0.5 );
}
geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
generateMorphTargets( geometry );
geometry.computeBoundingSphere();
line = new THREE.Line( geometry, material );
scene.add( line );
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
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() {
const delta = clock.getDelta();
const time = clock.getElapsedTime();
line.rotation.x = time * 0.25;
line.rotation.y = time * 0.5;
t += delta * 0.5;
line.morphTargetInfluences[ 0 ] = Math.abs( Math.sin( t ) );
renderer.render( scene, camera );
stats.update();
}
function generateMorphTargets( geometry ) {
const data = [];
for ( let i = 0; i < segments; i ++ ) {
const x = Math.random() * r - r / 2;
const y = Math.random() * r - r / 2;
const z = Math.random() * r - r / 2;
data.push( x, y, z );
}
const morphTarget = new THREE.Float32BufferAttribute( data, 3 );
morphTarget.name = 'target1';
geometry.morphAttributes.position = [ morphTarget ];
}
</script>
</body>
</html>