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webgl_buffergeometry_instancing_billboards.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - instanced particles - billboards - colors</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="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - instanced circle billboards - colors
<div id="notSupported" style="display:none">Sorry, your graphics card + browser does not support hardware instancing</div>
</div>
<script id="vshader" type="x-shader/x-vertex">
precision highp float;
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform float time;
attribute vec3 position;
attribute vec2 uv;
attribute vec3 translate;
varying vec2 vUv;
varying float vScale;
void main() {
vec4 mvPosition = modelViewMatrix * vec4( translate, 1.0 );
vec3 trTime = vec3(translate.x + time,translate.y + time,translate.z + time);
float scale = sin( trTime.x * 2.1 ) + sin( trTime.y * 3.2 ) + sin( trTime.z * 4.3 );
vScale = scale;
scale = scale * 10.0 + 10.0;
mvPosition.xyz += position * scale;
vUv = uv;
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision highp float;
uniform sampler2D map;
varying vec2 vUv;
varying float vScale;
// HSL to RGB Conversion helpers
vec3 HUEtoRGB(float H){
H = mod(H,1.0);
float R = abs(H * 6.0 - 3.0) - 1.0;
float G = 2.0 - abs(H * 6.0 - 2.0);
float B = 2.0 - abs(H * 6.0 - 4.0);
return clamp(vec3(R,G,B),0.0,1.0);
}
vec3 HSLtoRGB(vec3 HSL){
vec3 RGB = HUEtoRGB(HSL.x);
float C = (1.0 - abs(2.0 * HSL.z - 1.0)) * HSL.y;
return (RGB - 0.5) * C + HSL.z;
}
void main() {
vec4 diffuseColor = texture2D( map, vUv );
gl_FragColor = vec4( diffuseColor.xyz * HSLtoRGB(vec3(vScale/5.0, 1.0, 0.5)), diffuseColor.w );
if ( diffuseColor.w < 0.5 ) discard;
}
</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';
let container, stats;
let camera, scene, renderer;
let geometry, material, mesh;
init();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 5000 );
camera.position.z = 1400;
scene = new THREE.Scene();
const circleGeometry = new THREE.CircleGeometry( 1, 6 );
geometry = new THREE.InstancedBufferGeometry();
geometry.index = circleGeometry.index;
geometry.attributes = circleGeometry.attributes;
const particleCount = 75000;
const translateArray = new Float32Array( particleCount * 3 );
for ( let i = 0, i3 = 0, l = particleCount; i < l; i ++, i3 += 3 ) {
translateArray[ i3 + 0 ] = Math.random() * 2 - 1;
translateArray[ i3 + 1 ] = Math.random() * 2 - 1;
translateArray[ i3 + 2 ] = Math.random() * 2 - 1;
}
geometry.setAttribute( 'translate', new THREE.InstancedBufferAttribute( translateArray, 3 ) );
material = new THREE.RawShaderMaterial( {
uniforms: {
'map': { value: new THREE.TextureLoader().load( 'textures/sprites/circle.png' ) },
'time': { value: 0.0 }
},
vertexShader: document.getElementById( 'vshader' ).textContent,
fragmentShader: document.getElementById( 'fshader' ).textContent,
depthTest: true,
depthWrite: true
} );
mesh = new THREE.Mesh( geometry, material );
mesh.scale.set( 500, 500, 500 );
scene.add( mesh );
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
window.addEventListener( 'resize', onWindowResize );
return true;
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
const time = performance.now() * 0.0005;
material.uniforms[ 'time' ].value = time;
mesh.rotation.x = time * 0.2;
mesh.rotation.y = time * 0.4;
renderer.render( scene, camera );
stats.update();
}
</script>
</body>
</html>