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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>
<!-- 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"
}
}
</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({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>