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- <!-- Licensed under a BSD license. See license.html for license -->
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
- <title>Three.js - Debug - Clearing Logger</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- #debug {
- position: absolute;
- left: 1em;
- top: 1em;
- padding: 1em;
- background: rgba(0, 0, 0, 0.9);
- color: white;
- font-family: monospace;
- pointer-events: none;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- <div id="debug">
- <pre></pre>
- </div>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- class ClearingLogger {
- constructor( elem ) {
- this.elem = elem;
- this.lines = [];
- }
- log( ...args ) {
- this.lines.push( [ ...args ].join( ' ' ) );
- }
- render() {
- this.elem.textContent = this.lines.join( '\n' );
- this.lines = [];
- }
- }
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 50;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.z = 20;
- const scene = new THREE.Scene();
- scene.background = new THREE.Color( 'cyan' );
- const geometry = new THREE.SphereGeometry();
- const material = new THREE.MeshBasicMaterial( { color: 'red' } );
- const things = [];
- function rand( min, max ) {
- if ( max === undefined ) {
- max = min;
- min = 0;
- }
- return Math.random() * ( max - min ) + min;
- }
- function createThing() {
- const mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- things.push( {
- mesh,
- timer: 2,
- velocity: new THREE.Vector3( rand( - 5, 5 ), rand( - 5, 5 ), rand( - 5, 5 ) ),
- } );
- }
- canvas.addEventListener( 'click', createThing );
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = canvas.clientWidth;
- const height = canvas.clientHeight;
- const needResize = canvas.width !== width || canvas.height !== height;
- if ( needResize ) {
- renderer.setSize( width, height, false );
- }
- return needResize;
- }
- const logger = new ClearingLogger( document.querySelector( '#debug pre' ) );
- let then = 0;
- function render( now ) {
- now *= 0.001; // convert to seconds
- const deltaTime = now - then;
- then = now;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- logger.log( 'fps:', ( 1 / deltaTime ).toFixed( 1 ) );
- logger.log( 'num things:', things.length );
- for ( let i = 0; i < things.length; ) {
- const thing = things[ i ];
- const mesh = thing.mesh;
- const pos = mesh.position;
- logger.log(
- 'timer:', thing.timer.toFixed( 3 ),
- 'pos:', pos.x.toFixed( 3 ), pos.y.toFixed( 3 ), pos.z.toFixed( 3 ) );
- thing.timer -= deltaTime;
- if ( thing.timer <= 0 ) {
- // remove this thing. Note we don't advance `i`
- things.splice( i, 1 );
- scene.remove( mesh );
- } else {
- mesh.position.addScaledVector( thing.velocity, deltaTime );
- ++ i;
- }
- }
- renderer.render( scene, camera );
- logger.render();
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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