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243 lines
6.1 KiB
243 lines
6.1 KiB
3 years ago
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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 - buffergeometry - selective - draw</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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<script type="x-shader/x-vertex" id="vertexshader">
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attribute float visible;
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varying float vVisible;
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attribute vec3 vertColor;
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varying vec3 vColor;
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void main() {
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vColor = vertColor;
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vVisible = visible;
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gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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}
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</script>
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<script type="x-shader/x-fragment" id="fragmentshader">
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varying float vVisible;
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varying vec3 vColor;
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void main() {
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if ( vVisible > 0.0 ) {
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gl_FragColor = vec4( vColor, 1.0 );
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} else {
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discard;
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}
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}
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</script>
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> buffergeometry - selective - draw
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<div id="title"></div>
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<div id="ui"><a href="#" id="hideLines">CULL SOME LINES</a> - <a href="#" id="showAllLines">SHOW ALL LINES</a></div>
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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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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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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let camera, scene, renderer, stats;
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let geometry, mesh;
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const numLat = 100;
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const numLng = 200;
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let numLinesCulled = 0;
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init();
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animate();
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function init() {
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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scene = new THREE.Scene();
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camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.01, 10 );
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camera.position.z = 3.5;
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scene.add( new THREE.AmbientLight( 0x444444 ) );
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stats = new Stats();
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document.body.appendChild( stats.dom );
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window.addEventListener( 'resize', onWindowResize );
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addLines( 1.0 );
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const hideLinesButton = document.getElementById( 'hideLines' );
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hideLinesButton.addEventListener( 'click', hideLines );
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const showAllLinesButton = document.getElementById( 'showAllLines' );
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showAllLinesButton.addEventListener( 'click', showAllLines );
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}
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function addLines( radius ) {
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geometry = new THREE.BufferGeometry();
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const linePositions = new Float32Array( numLat * numLng * 3 * 2 );
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const lineColors = new Float32Array( numLat * numLng * 3 * 2 );
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const visible = new Float32Array( numLat * numLng * 2 );
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for ( let i = 0; i < numLat; ++ i ) {
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for ( let j = 0; j < numLng; ++ j ) {
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const lat = ( Math.random() * Math.PI ) / 50.0 + i / numLat * Math.PI;
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const lng = ( Math.random() * Math.PI ) / 50.0 + j / numLng * 2 * Math.PI;
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const index = i * numLng + j;
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linePositions[ index * 6 + 0 ] = 0;
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linePositions[ index * 6 + 1 ] = 0;
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linePositions[ index * 6 + 2 ] = 0;
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linePositions[ index * 6 + 3 ] = radius * Math.sin( lat ) * Math.cos( lng );
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linePositions[ index * 6 + 4 ] = radius * Math.cos( lat );
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linePositions[ index * 6 + 5 ] = radius * Math.sin( lat ) * Math.sin( lng );
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const color = new THREE.Color( 0xffffff );
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color.setHSL( lat / Math.PI, 1.0, 0.2 );
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lineColors[ index * 6 + 0 ] = color.r;
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lineColors[ index * 6 + 1 ] = color.g;
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lineColors[ index * 6 + 2 ] = color.b;
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color.setHSL( lat / Math.PI, 1.0, 0.7 );
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lineColors[ index * 6 + 3 ] = color.r;
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lineColors[ index * 6 + 4 ] = color.g;
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lineColors[ index * 6 + 5 ] = color.b;
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// non-0 is visible
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visible[ index * 2 + 0 ] = 1.0;
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visible[ index * 2 + 1 ] = 1.0;
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}
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}
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geometry.setAttribute( 'position', new THREE.BufferAttribute( linePositions, 3 ) );
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geometry.setAttribute( 'vertColor', new THREE.BufferAttribute( lineColors, 3 ) );
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geometry.setAttribute( 'visible', new THREE.BufferAttribute( visible, 1 ) );
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geometry.computeBoundingSphere();
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const shaderMaterial = new THREE.ShaderMaterial( {
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vertexShader: document.getElementById( 'vertexshader' ).textContent,
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fragmentShader: document.getElementById( 'fragmentshader' ).textContent
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} );
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mesh = new THREE.LineSegments( geometry, shaderMaterial );
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scene.add( mesh );
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updateCount();
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}
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function updateCount() {
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const str = '1 draw call, ' + numLat * numLng + ' lines, ' + numLinesCulled + ' culled (<a target="_blank" href="http://callum.com">author</a>)';
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document.getElementById( 'title' ).innerHTML = str.replace( /\B(?=(\d{3})+(?!\d))/g, ',' );
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}
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function hideLines() {
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for ( let i = 0; i < geometry.attributes.visible.array.length; i += 2 ) {
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if ( Math.random() > 0.75 ) {
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if ( geometry.attributes.visible.array[ i + 0 ] ) {
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++ numLinesCulled;
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}
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geometry.attributes.visible.array[ i + 0 ] = 0;
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geometry.attributes.visible.array[ i + 1 ] = 0;
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}
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}
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geometry.attributes.visible.needsUpdate = true;
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updateCount();
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}
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function showAllLines() {
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numLinesCulled = 0;
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for ( let i = 0; i < geometry.attributes.visible.array.length; i += 2 ) {
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geometry.attributes.visible.array[ i + 0 ] = 1;
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geometry.attributes.visible.array[ i + 1 ] = 1;
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}
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geometry.attributes.visible.needsUpdate = true;
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updateCount();
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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requestAnimationFrame( animate );
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const time = Date.now() * 0.001;
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mesh.rotation.x = time * 0.25;
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mesh.rotation.y = time * 0.5;
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stats.update();
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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