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webgl_buffergeometry_selective_draw.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - buffergeometry - selective - draw</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">
<script type="x-shader/x-vertex" id="vertexshader">
attribute float visible;
varying float vVisible;
attribute vec3 vertColor;
varying vec3 vColor;
void main() {
vColor = vertColor;
vVisible = visible;
gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
varying float vVisible;
varying vec3 vColor;
void main() {
if (vVisible > 0.0) {
gl_FragColor = vec4(vColor, 1.0);
} else {
discard;
}
}
</script>
</head>
<body>
<div id="info">
<a href="https://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> buffergeometry - selective - draw
<div id="title"></div>
<div id="ui"><a href="#" id="hideLines">CULL SOME LINES</a> - <a href="#" id="showAllLines">SHOW ALL LINES</a></div>
</div>
<!-- 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": {
"v3d": "../build/v3d.module.js",
"v3d/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as v3d from 'v3d';
import Stats from 'v3d/addons/libs/stats.module.js';
let camera, scene, renderer, stats;
let geometry, mesh;
const numLat = 100;
const numLng = 200;
let numLinesCulled = 0;
init();
animate();
function init() {
renderer = new v3d.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
scene = new v3d.Scene();
camera = new v3d.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.01, 10);
camera.position.z = 3.5;
scene.add(new v3d.AmbientLight(0x444444));
stats = new Stats();
document.body.appendChild(stats.dom);
window.addEventListener('resize', onWindowResize);
addLines(1.0);
const hideLinesButton = document.getElementById('hideLines');
hideLinesButton.addEventListener('click', hideLines);
const showAllLinesButton = document.getElementById('showAllLines');
showAllLinesButton.addEventListener('click', showAllLines);
}
function addLines(radius) {
geometry = new v3d.BufferGeometry();
const linePositions = new Float32Array(numLat * numLng * 3 * 2);
const lineColors = new Float32Array(numLat * numLng * 3 * 2);
const visible = new Float32Array(numLat * numLng * 2);
for (let i = 0; i < numLat; ++ i) {
for (let j = 0; j < numLng; ++ j) {
const lat = (Math.random() * Math.PI) / 50.0 + i / numLat * Math.PI;
const lng = (Math.random() * Math.PI) / 50.0 + j / numLng * 2 * Math.PI;
const index = i * numLng + j;
linePositions[index * 6 + 0] = 0;
linePositions[index * 6 + 1] = 0;
linePositions[index * 6 + 2] = 0;
linePositions[index * 6 + 3] = radius * Math.sin(lat) * Math.cos(lng);
linePositions[index * 6 + 4] = radius * Math.cos(lat);
linePositions[index * 6 + 5] = radius * Math.sin(lat) * Math.sin(lng);
const color = new v3d.Color(0xffffff);
color.setHSL(lat / Math.PI, 1.0, 0.2);
lineColors[index * 6 + 0] = color.r;
lineColors[index * 6 + 1] = color.g;
lineColors[index * 6 + 2] = color.b;
color.setHSL(lat / Math.PI, 1.0, 0.7);
lineColors[index * 6 + 3] = color.r;
lineColors[index * 6 + 4] = color.g;
lineColors[index * 6 + 5] = color.b;
// non-0 is visible
visible[index * 2 + 0] = 1.0;
visible[index * 2 + 1] = 1.0;
}
}
geometry.setAttribute('position', new v3d.BufferAttribute(linePositions, 3));
geometry.setAttribute('vertColor', new v3d.BufferAttribute(lineColors, 3));
geometry.setAttribute('visible', new v3d.BufferAttribute(visible, 1));
geometry.computeBoundingSphere();
const shaderMaterial = new v3d.ShaderMaterial({
vertexShader: document.getElementById('vertexshader').textContent,
fragmentShader: document.getElementById('fragmentshader').textContent
});
mesh = new v3d.LineSegments(geometry, shaderMaterial);
scene.add(mesh);
updateCount();
}
function updateCount() {
const str = '1 draw call, ' + numLat * numLng + ' lines, ' + numLinesCulled + ' culled (<a target="_blank" href="http://callum.com">author</a>)';
document.getElementById('title').innerHTML = str.replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}
function hideLines() {
for (let i = 0; i < geometry.attributes.visible.array.length; i += 2) {
if (Math.random() > 0.75) {
if (geometry.attributes.visible.array[i + 0]) {
++ numLinesCulled;
}
geometry.attributes.visible.array[i + 0] = 0;
geometry.attributes.visible.array[i + 1] = 0;
}
}
geometry.attributes.visible.needsUpdate = true;
updateCount();
}
function showAllLines() {
numLinesCulled = 0;
for (let i = 0; i < geometry.attributes.visible.array.length; i += 2) {
geometry.attributes.visible.array[i + 0] = 1;
geometry.attributes.visible.array[i + 1] = 1;
}
geometry.attributes.visible.needsUpdate = true;
updateCount();
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
requestAnimationFrame(animate);
const time = Date.now() * 0.001;
mesh.rotation.x = time * 0.25;
mesh.rotation.y = time * 0.5;
stats.update();
renderer.render(scene, camera);
}
</script>
</body>
</html>