examples/webgl_buffergeometry_lines.html

<!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">
		<style>
			a {
				color: #08f;
			}
		</style>
	</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="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';
			var container, stats;

			var camera, scene, renderer;

			var line;

			init();
			animate();

			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();

				var segments = 10000;

				var geometry = new THREE.BufferGeometry();
				var material = new THREE.LineBasicMaterial( { vertexColors: true } );

				var positions = [];
				var colors = [];

				var r = 800;

				for ( var i = 0; i < segments; i ++ ) {

					var x = Math.random() * r - r / 2;
					var y = Math.random() * r - r / 2;
					var 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 ) );

				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.outputEncoding = THREE.sRGBEncoding;

				container.appendChild( renderer.domElement );

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			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() {

				var time = Date.now() * 0.001;

				line.rotation.x = time * 0.25;
				line.rotation.y = time * 0.5;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>