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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - reverse depth buffer</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ <style>
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+ body {
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+ margin: 0;
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+ background-color: #000;
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+ color: #fff;
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+ font-family: Monospace;
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+ font-size: 13px;
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+ line-height: 24px;
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+ overscroll-behavior: none;
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+ }
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+
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+ a {
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+ color: #ff0;
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+ text-decoration: none;
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+ }
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+
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+ a:hover {
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+ text-decoration: underline;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px;
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+ width: 100%;
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+ padding: 10px;
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+ box-sizing: border-box;
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+ text-align: center;
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+ -moz-user-select: none;
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+ -webkit-user-select: none;
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+ -ms-user-select: none;
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+ user-select: none;
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+ pointer-events: none;
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+ z-index: 1; /* TODO Solve this in HTML */
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+ }
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+
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+ #container {
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+ display: flex;
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+ }
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+
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+ #container_normal,
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+ #container_logarithmic,
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+ #container_reverse {
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+ width: 33%;
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+ display: inline-block;
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+ position: relative;
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+ }
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+
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+ .container_label {
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+ position: absolute;
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+ bottom: 1em;
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+ width: 100%;
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+ color: white;
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+ z-index: 10;
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+ display: block;
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+ text-align: center;
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+ }
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+
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+ #depth-warning {
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+ position: absolute;
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+ top: 40px;
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+ width: 100%;
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+ padding: 10px;
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+ box-sizing: border-box;
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+ text-align: center;
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+ color: #ff5555;
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+ font-weight: bold;
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+ z-index: 2;
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+ display: none;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <div id="container">
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+ <div id="container_normal"><h2 class="container_label">normal z-buffer</h2></div>
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+ <div id="container_logarithmic"><h2 class="container_label">logarithmic z-buffer</h2></div>
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+ <div id="container_reverse"><h2 class="container_label">reverse z-buffer</h2></div>
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+ </div>
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+
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - reverse depth buffer<br/>
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+ </div>
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+
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+ <div id="depth-warning">
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+ Warning: Your browser's WebGL provides less than 24-bit depth buffer precision. This example may not display correctly.
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+ </div>
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+
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+ <script type="importmap">
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+ {
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+ "imports": {
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+ "three": "../build/three.module.js",
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+ "three/addons/": "./jsm/"
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+ }
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+ }
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+ </script>
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+
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+ <script type="module">
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+ // https://webgpu.github.io/webgpu-samples/?sample=reversedZ
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+ import * as THREE from 'three';
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+
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+ import Stats from 'three/addons/libs/stats.module.js';
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+
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+ let stats, camera, scene, normalRenderer, logarithmicRenderer, reverseRenderer;
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+ const meshes = [];
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ const container = document.getElementById( 'container' );
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+
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+ stats = new Stats();
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+ container.appendChild( stats.dom );
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+
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+ camera = new THREE.PerspectiveCamera( 72, 0.33 * window.innerWidth / window.innerHeight, 5, 9999 );
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+ camera.position.z = 12;
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+
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+ scene = new THREE.Scene();
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+
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+ const xCount = 1;
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+ const yCount = 5;
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+ const numInstances = xCount * yCount;
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+
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+ const d = 0.0001; // half distance between two planes
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+ const o = 0.5; // half x offset to shift planes so they are only partially overlaping
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+
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+ const positions = new Float32Array( [
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+ - 1 - o, - 1, d,
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+ 1 - o, - 1, d,
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+ - 1 - o, 1, d,
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+ 1 - o, - 1, d,
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+ 1 - o, 1, d,
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+ - 1 - o, 1, d,
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+
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+ - 1 + o, - 1, - d,
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+ 1 + o, - 1, - d,
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+ - 1 + o, 1, - d,
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+ 1 + o, - 1, - d,
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+ 1 + o, 1, - d,
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+ - 1 + o, 1, - d,
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+ ] );
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+
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+ const colors = new Float32Array( [
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+ 1, 0, 0,
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+ 1, 0, 0,
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+ 1, 0, 0,
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+ 1, 0, 0,
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+ 1, 0, 0,
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+ 1, 0, 0,
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+
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+ 0, 1, 0,
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+ 0, 1, 0,
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+ 0, 1, 0,
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+ 0, 1, 0,
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+ 0, 1, 0,
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+ 0, 1, 0,
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+ ] );
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+
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+ const geometry = new THREE.BufferGeometry();
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+ geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
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+ geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
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+
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+ const material = new THREE.MeshBasicMaterial( { vertexColors: true } );
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+
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+ for ( let i = 0; i < numInstances; i ++ ) {
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+
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+ const mesh = new THREE.Mesh( geometry, material );
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+ meshes.push( mesh );
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+ scene.add( mesh );
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+
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+ }
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+
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+ let i = 0;
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+ for ( let x = 0; x < xCount; x ++ ) {
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+
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+ for ( let y = 0; y < yCount; y ++ ) {
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+
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+ const z = - 800 * i;
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+ const s = 1 + 50 * i;
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+
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+ const mesh = meshes[ i ];
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+ mesh.position.set(
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+ x - xCount / 2 + 0.5,
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+ ( 4.0 - 0.2 * z ) * ( y - yCount / 2 + 1.0 ),
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+ z
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+ );
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+ mesh.scale.setScalar( s );
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+
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+ i ++;
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+
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+ }
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+
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+ }
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+
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+ const normalContainer = document.getElementById( 'container_normal' );
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+ normalRenderer = new THREE.WebGLRenderer();
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+ normalRenderer.setPixelRatio( window.devicePixelRatio );
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+ normalRenderer.setSize( 0.33 * window.innerWidth, window.innerHeight );
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+ normalRenderer.domElement.style.position = 'relative';
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+ normalContainer.appendChild( normalRenderer.domElement );
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+
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+ const logarithmicContainer = document.getElementById( 'container_logarithmic' );
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+ logarithmicRenderer = new THREE.WebGLRenderer( { logarithmicDepthBuffer: true } );
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+ logarithmicRenderer.setPixelRatio( window.devicePixelRatio );
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+ logarithmicRenderer.setSize( 0.33 * window.innerWidth, window.innerHeight );
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+ logarithmicRenderer.domElement.style.position = 'relative';
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+ logarithmicContainer.appendChild( logarithmicRenderer.domElement );
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+
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+ const reverseContainer = document.getElementById( 'container_reverse' );
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+ reverseRenderer = new THREE.WebGLRenderer( { reverseDepthBuffer: true } );
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+ reverseRenderer.setPixelRatio( window.devicePixelRatio );
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+ reverseRenderer.setSize( 0.33 * window.innerWidth, window.innerHeight );
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+ reverseRenderer.domElement.style.position = 'relative';
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+ reverseContainer.appendChild( reverseRenderer.domElement );
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+
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+ // Check depth buffer precision
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+ const gl = normalRenderer.getContext();
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+
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+ const depthBits = gl.getParameter( gl.DEPTH_BITS );
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+
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+ if ( depthBits < 24 ) {
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+
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+ document.getElementById( 'depth-warning' ).style.display = 'block';
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+
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+ }
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ }
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ const now = performance.now() / 1000;
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+
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+ for ( let i = 0; i < meshes.length; i ++ ) {
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+
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+ const angle = THREE.MathUtils.degToRad( 30 );
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+ const axis = new THREE.Vector3( Math.sin( now ), Math.cos( now ), 0 );
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+ meshes[ i ].quaternion.setFromAxisAngle( axis, angle );
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+
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+ }
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+
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+ render();
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+
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+ }
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+
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+ function render() {
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+
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+ normalRenderer.render( scene, camera );
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+ logarithmicRenderer.render( scene, camera );
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+ reverseRenderer.render( scene, camera );
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+
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+ stats.update();
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ normalRenderer.setSize( 0.33 * window.innerWidth, window.innerHeight );
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+ logarithmicRenderer.setSize( 0.33 * window.innerWidth, window.innerHeight );
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+ reverseRenderer.setSize( 0.33 * window.innerWidth, window.innerHeight );
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+
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+ camera.aspect = 0.33 * window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ }
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+ </script>
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+
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+ </body>
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+</html>
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George Corney
