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webgl_buffergeometry_drawrange.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - buffergeometry - lines drawrange</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">
</head>
<body>
<div id="container"></div>
<div id="info">
<a href="https://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> webgl - buffergeometry drawrange<br/>
by <a href="https://twitter.com/fernandojsg">fernandojsg</a>
</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 Stats from 'v3d/addons/libs/stats.module.js';
import { GUI } from 'v3d/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'v3d/addons/controls/OrbitControls.js';
let group;
let container, stats;
const particlesData = [];
let camera, scene, renderer;
let positions, colors;
let particles;
let pointCloud;
let particlePositions;
let linesMesh;
const maxParticleCount = 1000;
let particleCount = 500;
const r = 800;
const rHalf = r / 2;
const effectController = {
showDots: true,
showLines: true,
minDistance: 150,
limitConnections: false,
maxConnections: 20,
particleCount: 500
};
init();
animate();
function initGUI() {
const gui = new GUI();
gui.add(effectController, 'showDots').onChange(function(value) {
pointCloud.visible = value;
});
gui.add(effectController, 'showLines').onChange(function(value) {
linesMesh.visible = value;
});
gui.add(effectController, 'minDistance', 10, 300);
gui.add(effectController, 'limitConnections');
gui.add(effectController, 'maxConnections', 0, 30, 1);
gui.add(effectController, 'particleCount', 0, maxParticleCount, 1).onChange(function(value) {
particleCount = parseInt(value);
particles.setDrawRange(0, particleCount);
});
}
function init() {
initGUI();
container = document.getElementById('container');
camera = new v3d.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 4000);
camera.position.z = 1750;
const controls = new OrbitControls(camera, container);
controls.minDistance = 1000;
controls.maxDistance = 3000;
scene = new v3d.Scene();
group = new v3d.Group();
scene.add(group);
const helper = new v3d.BoxHelper(new v3d.Mesh(new v3d.BoxGeometry(r, r, r)));
helper.material.color.setHex(0x101010);
helper.material.blending = v3d.AdditiveBlending;
helper.material.transparent = true;
group.add(helper);
const segments = maxParticleCount * maxParticleCount;
positions = new Float32Array(segments * 3);
colors = new Float32Array(segments * 3);
const pMaterial = new v3d.PointsMaterial({
color: 0xFFFFFF,
size: 3,
blending: v3d.AdditiveBlending,
transparent: true,
sizeAttenuation: false
});
particles = new v3d.BufferGeometry();
particlePositions = new Float32Array(maxParticleCount * 3);
for (let i = 0; i < maxParticleCount; i++) {
const x = Math.random() * r - r / 2;
const y = Math.random() * r - r / 2;
const z = Math.random() * r - r / 2;
particlePositions[i * 3] = x;
particlePositions[i * 3 + 1] = y;
particlePositions[i * 3 + 2] = z;
// add it to the geometry
particlesData.push({
velocity: new v3d.Vector3(- 1 + Math.random() * 2, -1 + Math.random() * 2, -1 + Math.random() * 2),
numConnections: 0
});
}
particles.setDrawRange(0, particleCount);
particles.setAttribute('position', new v3d.BufferAttribute(particlePositions, 3).setUsage(v3d.DynamicDrawUsage));
// create the particle system
pointCloud = new v3d.Points(particles, pMaterial);
group.add(pointCloud);
const geometry = new v3d.BufferGeometry();
geometry.setAttribute('position', new v3d.BufferAttribute(positions, 3).setUsage(v3d.DynamicDrawUsage));
geometry.setAttribute('color', new v3d.BufferAttribute(colors, 3).setUsage(v3d.DynamicDrawUsage));
geometry.computeBoundingSphere();
geometry.setDrawRange(0, 0);
const material = new v3d.LineBasicMaterial({
vertexColors: true,
blending: v3d.AdditiveBlending,
transparent: true
});
linesMesh = new v3d.LineSegments(geometry, material);
group.add(linesMesh);
//
renderer = new v3d.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.outputEncoding = v3d.sRGBEncoding;
container.appendChild(renderer.domElement);
//
stats = new Stats();
container.appendChild(stats.dom);
window.addEventListener('resize', onWindowResize);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
let vertexpos = 0;
let colorpos = 0;
let numConnected = 0;
for (let i = 0; i < particleCount; i++)
particlesData[i].numConnections = 0;
for (let i = 0; i < particleCount; i++) {
// get the particle
const particleData = particlesData[i];
particlePositions[i * 3] += particleData.velocity.x;
particlePositions[i * 3 + 1] += particleData.velocity.y;
particlePositions[i * 3 + 2] += particleData.velocity.z;
if (particlePositions[i * 3 + 1] < - rHalf || particlePositions[i * 3 + 1] > rHalf)
particleData.velocity.y = -particleData.velocity.y;
if (particlePositions[i * 3] < - rHalf || particlePositions[i * 3] > rHalf)
particleData.velocity.x = -particleData.velocity.x;
if (particlePositions[i * 3 + 2] < - rHalf || particlePositions[i * 3 + 2] > rHalf)
particleData.velocity.z = -particleData.velocity.z;
if (effectController.limitConnections && particleData.numConnections >= effectController.maxConnections)
continue;
// Check collision
for (let j = i + 1; j < particleCount; j ++) {
const particleDataB = particlesData[j];
if (effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections)
continue;
const dx = particlePositions[i * 3] - particlePositions[j * 3];
const dy = particlePositions[i * 3 + 1] - particlePositions[j * 3 + 1];
const dz = particlePositions[i * 3 + 2] - particlePositions[j * 3 + 2];
const dist = Math.sqrt(dx * dx + dy * dy + dz * dz);
if (dist < effectController.minDistance) {
particleData.numConnections ++;
particleDataB.numConnections ++;
const alpha = 1.0 - dist / effectController.minDistance;
positions[vertexpos ++] = particlePositions[i * 3];
positions[vertexpos ++] = particlePositions[i * 3 + 1];
positions[vertexpos ++] = particlePositions[i * 3 + 2];
positions[vertexpos ++] = particlePositions[j * 3];
positions[vertexpos ++] = particlePositions[j * 3 + 1];
positions[vertexpos ++] = particlePositions[j * 3 + 2];
colors[colorpos ++] = alpha;
colors[colorpos ++] = alpha;
colors[colorpos ++] = alpha;
colors[colorpos ++] = alpha;
colors[colorpos ++] = alpha;
colors[colorpos ++] = alpha;
numConnected ++;
}
}
}
linesMesh.geometry.setDrawRange(0, numConnected * 2);
linesMesh.geometry.attributes.position.needsUpdate = true;
linesMesh.geometry.attributes.color.needsUpdate = true;
pointCloud.geometry.attributes.position.needsUpdate = true;
requestAnimationFrame(animate);
stats.update();
render();
}
function render() {
const time = Date.now() * 0.001;
group.rotation.y = time * 0.1;
renderer.render(scene, camera);
}
</script>
</body>
</html>