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<title>three.js webgl - particles - waves</title>
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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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<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl particles waves example
</div>
<script type="x-shader/x-vertex" id="vertexshader">
attribute float scale;
void main() {
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = scale * ( 300.0 / - mvPosition.z );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
void main() {
if ( length( gl_PointCoord - vec2( 0.5, 0.5 ) ) > 0.475 ) discard;
gl_FragColor = vec4( color, 1.0 );
}
</script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
const SEPARATION = 100, AMOUNTX = 50, AMOUNTY = 50;
let container, stats;
let camera, scene, renderer;
let particles, count = 0;
let mouseX = 0, mouseY = 0;
let windowHalfX = window.innerWidth / 2;
let windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 1000;
scene = new THREE.Scene();
//
const numParticles = AMOUNTX * AMOUNTY;
const positions = new Float32Array( numParticles * 3 );
const scales = new Float32Array( numParticles );
let i = 0, j = 0;
for ( let ix = 0; ix < AMOUNTX; ix ++ ) {
for ( let iy = 0; iy < AMOUNTY; iy ++ ) {
positions[ i ] = ix * SEPARATION - ( ( AMOUNTX * SEPARATION ) / 2 ); // x
positions[ i + 1 ] = 0; // y
positions[ i + 2 ] = iy * SEPARATION - ( ( AMOUNTY * SEPARATION ) / 2 ); // z
scales[ j ] = 1;
i += 3;
j ++;
}
}
const geometry = new THREE.BufferGeometry();
geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
geometry.setAttribute( 'scale', new THREE.BufferAttribute( scales, 1 ) );
const material = new THREE.ShaderMaterial( {
uniforms: {
color: { value: new THREE.Color( 0xffffff ) },
},
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent
} );
//
particles = new THREE.Points( geometry, material );
scene.add( particles );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
container.style.touchAction = 'none';
container.addEventListener( 'pointermove', onPointerMove );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function onPointerMove( event ) {
if ( event.isPrimary === false ) return;
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
camera.position.x += ( mouseX - camera.position.x ) * .05;
camera.position.y += ( - mouseY - camera.position.y ) * .05;
camera.lookAt( scene.position );
const positions = particles.geometry.attributes.position.array;
const scales = particles.geometry.attributes.scale.array;
let i = 0, j = 0;
for ( let ix = 0; ix < AMOUNTX; ix ++ ) {
for ( let iy = 0; iy < AMOUNTY; iy ++ ) {
positions[ i + 1 ] = ( Math.sin( ( ix + count ) * 0.3 ) * 50 ) +
( Math.sin( ( iy + count ) * 0.5 ) * 50 );
scales[ j ] = ( Math.sin( ( ix + count ) * 0.3 ) + 1 ) * 20 +
( Math.sin( ( iy + count ) * 0.5 ) + 1 ) * 20;
i += 3;
j ++;
}
}
particles.geometry.attributes.position.needsUpdate = true;
particles.geometry.attributes.scale.needsUpdate = true;
renderer.render( scene, camera );
count += 0.1;
}
</script>
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