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webgl_custom_attributes_points3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - custom attributes [particles][billboards][alphatest]</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> - custom attributes example - billboards - alphatest</div>
<div id="container"></div>
<script type="x-shader/x-vertex" id="vertexshader">
attribute float size;
attribute vec4 ca;
varying vec4 vColor;
void main() {
vColor = ca;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( 150.0 / -mvPosition.z );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
uniform sampler2D pointTexture;
varying vec4 vColor;
void main() {
vec4 outColor = texture2D( pointTexture, gl_PointCoord );
if ( outColor.a < 0.5 ) discard;
gl_FragColor = outColor * vec4( color * vColor.xyz, 1.0 );
float depth = gl_FragCoord.z / gl_FragCoord.w;
const vec3 fogColor = vec3( 0.0 );
float fogFactor = smoothstep( 200.0, 600.0, depth );
gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );
}
</script>
<script type="module">
import * as THREE from '../build/three.module.js';
import Stats from './jsm/libs/stats.module.js';
var renderer, scene, camera, stats;
var object;
var vertices1;
var WIDTH = window.innerWidth;
var HEIGHT = window.innerHeight;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 40, WIDTH / HEIGHT, 1, 1000 );
camera.position.z = 500;
scene = new THREE.Scene();
var radius = 100, inner = 0.6 * radius;
var vertices = [];
for ( var i = 0; i < 100000; i ++ ) {
var vertex = new THREE.Vector3();
vertex.x = Math.random() * 2 - 1;
vertex.y = Math.random() * 2 - 1;
vertex.z = Math.random() * 2 - 1;
vertex.multiplyScalar( radius );
if ( ( vertex.x > inner || vertex.x < - inner ) ||
( vertex.y > inner || vertex.y < - inner ) ||
( vertex.z > inner || vertex.z < - inner ) )
vertices.push( vertex );
}
vertices1 = vertices.length;
radius = 200;
var geometry2 = new THREE.BoxGeometry( radius, 0.1 * radius, 0.1 * radius, 50, 5, 5 );
var matrix = new THREE.Matrix4();
var position = new THREE.Vector3();
var rotation = new THREE.Euler();
var quaternion = new THREE.Quaternion();
var scale = new THREE.Vector3( 1, 1, 1 );
function addGeo( geo, x, y, z, ry ) {
position.set( x, y, z );
rotation.set( 0, ry, 0 );
matrix.compose( position, quaternion.setFromEuler( rotation ), scale );
for ( var i = 0, l = geo.vertices.length; i < l; i ++ ) {
var vertex = geo.vertices[ i ];
vertices.push( vertex.clone().applyMatrix4( matrix ) );
}
}
// side 1
addGeo( geometry2, 0, 110, 110, 0 );
addGeo( geometry2, 0, 110, - 110, 0 );
addGeo( geometry2, 0, - 110, 110, 0 );
addGeo( geometry2, 0, - 110, - 110, 0 );
// side 2
addGeo( geometry2, 110, 110, 0, Math.PI / 2 );
addGeo( geometry2, 110, - 110, 0, Math.PI / 2 );
addGeo( geometry2, - 110, 110, 0, Math.PI / 2 );
addGeo( geometry2, - 110, - 110, 0, Math.PI / 2 );
// corner edges
var geometry3 = new THREE.BoxGeometry( 0.1 * radius, radius * 1.2, 0.1 * radius, 5, 60, 5 );
addGeo( geometry3, 110, 0, 110, 0 );
addGeo( geometry3, 110, 0, - 110, 0 );
addGeo( geometry3, - 110, 0, 110, 0 );
addGeo( geometry3, - 110, 0, - 110, 0 );
var positions = new Float32Array( vertices.length * 3 );
var colors = new Float32Array( vertices.length * 3 );
var sizes = new Float32Array( vertices.length );
var vertex;
var color = new THREE.Color();
for ( var i = 0; i < vertices.length; i ++ ) {
vertex = vertices[ i ];
vertex.toArray( positions, i * 3 );
if ( i < vertices1 ) {
color.setHSL( 0.5 + 0.2 * ( i / vertices1 ), 1, 0.5 );
} else {
color.setHSL( 0.1, 1, 0.5 );
}
color.toArray( colors, i * 3 );
sizes[ i ] = i < vertices1 ? 10 : 40;
}
var geometry = new THREE.BufferGeometry();
geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
geometry.setAttribute( 'ca', new THREE.BufferAttribute( colors, 3 ) );
geometry.setAttribute( 'size', new THREE.BufferAttribute( sizes, 1 ) );
//
var texture = new THREE.TextureLoader().load( "textures/sprites/ball.png" );
texture.wrapS = THREE.RepeatWrapping;
texture.wrapT = THREE.RepeatWrapping;
var material = new THREE.ShaderMaterial( {
uniforms: {
amplitude: { value: 1.0 },
color: { value: new THREE.Color( 0xffffff ) },
pointTexture: { value: texture }
},
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent
} );
//
object = new THREE.Points( geometry, material );
scene.add( object );
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( WIDTH, HEIGHT );
var container = document.getElementById( 'container' );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
var time = Date.now() * 0.01;
object.rotation.y = object.rotation.z = 0.02 * time;
var geometry = object.geometry;
var attributes = geometry.attributes;
for ( var i = 0; i < attributes.size.array.length; i ++ ) {
if ( i < vertices1 ) {
attributes.size.array[ i ] = Math.max( 0, 26 + 32 * Math.sin( 0.1 * i + 0.6 * time ) );
}
}
attributes.size.needsUpdate = true;
renderer.render( scene, camera );
}
</script>
</body>
</html>