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webgl_camera_logarithmicdepthbuffer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - cameras - logarithmic depth buffer</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>
body{
touch-action: none;
}
.renderer_label {
position: absolute;
bottom: 1em;
width: 100%;
color: white;
z-index: 10;
display: block;
text-align: center;
}
#container {
display: flex;
}
#container_normal {
width: 50%;
display: inline-block;
position: relative;
}
#container_logzbuf {
width: 50%;
display: inline-block;
position: relative;
}
#renderer_border {
position: absolute;
top: 0;
left: 25%;
bottom: 0;
width: 2px;
z-index: 10;
opacity: .8;
background: #ccc;
border: 1px inset #ccc;
cursor: col-resize;
}
</style>
</head>
<body>
<div id="container">
<div id="container_normal"><h2 class="renderer_label">normal z-buffer</h2></div>
<div id="container_logzbuf"><h2 class="renderer_label">logarithmic z-buffer</h2></div>
<div id="renderer_border"></div>
</div>
<div id="info">
<a href="https://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> - cameras - logarithmic depth buffer<br/>
mousewheel to dolly out
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"v3d": "../build/v3d.module.js",
"v3d/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as v3d from 'v3d';
import { FontLoader } from 'v3d/addons/loaders/FontLoader.js';
import { TextGeometry } from 'v3d/addons/geometries/TextGeometry.js';
import Stats from 'v3d/addons/libs/stats.module.js';
// 1 micrometer to 100 billion light years in one scene, with 1 unit = 1 meter? preposterous! and yet...
const NEAR = 1e-6, FAR = 1e27;
let SCREEN_WIDTH = window.innerWidth;
let SCREEN_HEIGHT = window.innerHeight;
let screensplit = .25, screensplit_right = 0;
const mouse = [.5, .5];
let zoompos = -100, minzoomspeed = .015;
let zoomspeed = minzoomspeed;
let container, border, stats;
const objects = {};
// Generate a number of text labels, from 1µm in size up to 100,000,000 light years
// Try to use some descriptive real-world examples of objects at each scale
const labeldata = [
{ size: .01, scale: 0.0001, label: 'microscopic (1µm)' }, // FIXME - triangulating text fails at this size, so we scale instead
{ size: .01, scale: 0.1, label: 'minuscule (1mm)' },
{ size: .01, scale: 1.0, label: 'tiny (1cm)' },
{ size: 1, scale: 1.0, label: 'child-sized (1m)' },
{ size: 10, scale: 1.0, label: 'tree-sized (10m)' },
{ size: 100, scale: 1.0, label: 'building-sized (100m)' },
{ size: 1000, scale: 1.0, label: 'medium (1km)' },
{ size: 10000, scale: 1.0, label: 'city-sized (10km)' },
{ size: 3400000, scale: 1.0, label: 'moon-sized (3,400 Km)' },
{ size: 12000000, scale: 1.0, label: 'planet-sized (12,000 km)' },
{ size: 1400000000, scale: 1.0, label: 'sun-sized (1,400,000 km)' },
{ size: 7.47e12, scale: 1.0, label: 'solar system-sized (50Au)' },
{ size: 9.4605284e15, scale: 1.0, label: 'gargantuan (1 light year)' },
{ size: 3.08567758e16, scale: 1.0, label: 'ludicrous (1 parsec)' },
{ size: 1e19, scale: 1.0, label: 'mind boggling (1000 light years)' }
];
init();
function init() {
container = document.getElementById('container');
const loader = new FontLoader();
loader.load('fonts/helvetiker_regular.typeface.json', function(font) {
const scene = initScene(font);
// Initialize two copies of the same scene, one with normal z-buffer and one with logarithmic z-buffer
objects.normal = initView(scene, 'normal', false);
objects.logzbuf = initView(scene, 'logzbuf', true);
animate();
});
stats = new Stats();
container.appendChild(stats.dom);
// Resize border allows the user to easily compare effects of logarithmic depth buffer over the whole scene
border = document.getElementById('renderer_border');
border.addEventListener('pointerdown', onBorderPointerDown);
window.addEventListener('mousemove', onMouseMove);
window.addEventListener('resize', onWindowResize);
window.addEventListener('wheel', onMouseWheel);
}
function initView(scene, name, logDepthBuf) {
const framecontainer = document.getElementById('container_' + name);
const camera = new v3d.PerspectiveCamera(50, screensplit * SCREEN_WIDTH / SCREEN_HEIGHT, NEAR, FAR);
scene.add(camera);
const renderer = new v3d.WebGLRenderer({ antialias: true, logarithmicDepthBuffer: logDepthBuf });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(SCREEN_WIDTH / 2, SCREEN_HEIGHT);
renderer.domElement.style.position = 'relative';
renderer.domElement.id = 'renderer_' + name;
framecontainer.appendChild(renderer.domElement);
return { container: framecontainer, renderer: renderer, scene: scene, camera: camera };
}
function initScene(font) {
const scene = new v3d.Scene();
scene.add(new v3d.AmbientLight(0x222222));
const light = new v3d.DirectionalLight(0xffffff, 1);
light.position.set(100, 100, 100);
scene.add(light);
const materialargs = {
color: 0xffffff,
specular: 0x050505,
shininess: 50,
emissive: 0x000000
};
const geometry = new v3d.SphereGeometry(0.5, 24, 12);
for (let i = 0; i < labeldata.length; i++) {
const scale = labeldata[i].scale || 1;
const labelgeo = new TextGeometry(labeldata[i].label, {
font: font,
size: labeldata[i].size,
height: labeldata[i].size / 2
});
labelgeo.computeBoundingSphere();
// center text
labelgeo.translate(-labelgeo.boundingSphere.radius, 0, 0);
materialargs.color = new v3d.Color().setHSL(Math.random(), 0.5, 0.5);
const material = new v3d.MeshPhongMaterial(materialargs);
const group = new v3d.Group();
group.position.z = -labeldata[i].size * scale;
scene.add(group);
const textmesh = new v3d.Mesh(labelgeo, material);
textmesh.scale.set(scale, scale, scale);
textmesh.position.z = -labeldata[i].size * scale;
textmesh.position.y = labeldata[i].size / 4 * scale;
group.add(textmesh);
const dotmesh = new v3d.Mesh(geometry, material);
dotmesh.position.y = -labeldata[i].size / 4 * scale;
dotmesh.scale.multiplyScalar(labeldata[i].size * scale);
group.add(dotmesh);
}
return scene;
}
function updateRendererSizes() {
// Recalculate size for both renderers when screen size or split location changes
SCREEN_WIDTH = window.innerWidth;
SCREEN_HEIGHT = window.innerHeight;
screensplit_right = 1 - screensplit;
objects.normal.renderer.setSize(screensplit * SCREEN_WIDTH, SCREEN_HEIGHT);
objects.normal.camera.aspect = screensplit * SCREEN_WIDTH / SCREEN_HEIGHT;
objects.normal.camera.updateProjectionMatrix();
objects.normal.camera.setViewOffset(SCREEN_WIDTH, SCREEN_HEIGHT, 0, 0, SCREEN_WIDTH * screensplit, SCREEN_HEIGHT);
objects.normal.container.style.width = (screensplit * 100) + '%';
objects.logzbuf.renderer.setSize(screensplit_right * SCREEN_WIDTH, SCREEN_HEIGHT);
objects.logzbuf.camera.aspect = screensplit_right * SCREEN_WIDTH / SCREEN_HEIGHT;
objects.logzbuf.camera.updateProjectionMatrix();
objects.logzbuf.camera.setViewOffset(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_WIDTH * screensplit, 0, SCREEN_WIDTH * screensplit_right, SCREEN_HEIGHT);
objects.logzbuf.container.style.width = (screensplit_right * 100) + '%';
border.style.left = (screensplit * 100) + '%';
}
function animate() {
requestAnimationFrame(animate);
render();
}
function render() {
// Put some limits on zooming
const minzoom = labeldata[0].size * labeldata[0].scale * 1;
const maxzoom = labeldata[labeldata.length - 1].size * labeldata[labeldata.length - 1].scale * 100;
let damping = (Math.abs(zoomspeed) > minzoomspeed ? .95 : 1.0);
// Zoom out faster the further out you go
const zoom = v3d.MathUtils.clamp(Math.pow(Math.E, zoompos), minzoom, maxzoom);
zoompos = Math.log(zoom);
// Slow down quickly at the zoom limits
if ((zoom == minzoom && zoomspeed < 0) || (zoom == maxzoom && zoomspeed > 0)) {
damping = .85;
}
zoompos += zoomspeed;
zoomspeed *= damping;
objects.normal.camera.position.x = Math.sin(.5 * Math.PI * (mouse[0] - .5)) * zoom;
objects.normal.camera.position.y = Math.sin(.25 * Math.PI * (mouse[1] - .5)) * zoom;
objects.normal.camera.position.z = Math.cos(.5 * Math.PI * (mouse[0] - .5)) * zoom;
objects.normal.camera.lookAt(objects.normal.scene.position);
// Clone camera settings across both scenes
objects.logzbuf.camera.position.copy(objects.normal.camera.position);
objects.logzbuf.camera.quaternion.copy(objects.normal.camera.quaternion);
// Update renderer sizes if the split has changed
if (screensplit_right != 1 - screensplit) {
updateRendererSizes();
}
objects.normal.renderer.render(objects.normal.scene, objects.normal.camera);
objects.logzbuf.renderer.render(objects.logzbuf.scene, objects.logzbuf.camera);
stats.update();
}
function onWindowResize() {
updateRendererSizes();
}
function onBorderPointerDown() {
// activate draggable window resizing bar
window.addEventListener('pointermove', onBorderPointerMove);
window.addEventListener('pointerup', onBorderPointerUp);
}
function onBorderPointerMove(ev) {
screensplit = Math.max(0, Math.min(1, ev.clientX / window.innerWidth));
}
function onBorderPointerUp() {
window.removeEventListener('pointermove', onBorderPointerMove);
window.removeEventListener('pointerup', onBorderPointerUp);
}
function onMouseMove(ev) {
mouse[0] = ev.clientX / window.innerWidth;
mouse[1] = ev.clientY / window.innerHeight;
}
function onMouseWheel(ev) {
const amount = ev.deltaY;
if (amount === 0) return;
const dir = amount / Math.abs(amount);
zoomspeed = dir / 10;
// Slow down default zoom speed after user starts zooming, to give them more control
minzoomspeed = 0.001;
}
</script>
</body>
</html>