You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

258 lines
6.8 KiB

2 years ago
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - materials - custom blending</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>
<!-- 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": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
let camera, scene, renderer;
let mapBg;
const materials = [];
const params = {
blendEquation: THREE.AddEquation
};
const equations = { Add: THREE.AddEquation, Subtract: THREE.SubtractEquation, ReverseSubtract: THREE.ReverseSubtractEquation, Min: THREE.MinEquation, Max: THREE.MaxEquation };
init();
animate();
function init() {
// CAMERA
camera = new THREE.PerspectiveCamera( 80, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.z = 700;
// SCENE
scene = new THREE.Scene();
// BACKGROUND
const canvas = document.createElement( 'canvas' );
const ctx = canvas.getContext( '2d' );
canvas.width = canvas.height = 128;
ctx.fillStyle = '#ddd';
ctx.fillRect( 0, 0, 128, 128 );
ctx.fillStyle = '#555';
ctx.fillRect( 0, 0, 64, 64 );
ctx.fillStyle = '#999';
ctx.fillRect( 32, 32, 32, 32 );
ctx.fillStyle = '#555';
ctx.fillRect( 64, 64, 64, 64 );
ctx.fillStyle = '#777';
ctx.fillRect( 96, 96, 32, 32 );
mapBg = new THREE.CanvasTexture( canvas );
mapBg.wrapS = mapBg.wrapT = THREE.RepeatWrapping;
mapBg.repeat.set( 64, 32 );
scene.background = mapBg;
// FOREGROUND OBJECTS
const src = [
{ name: 'Zero', constant: THREE.ZeroFactor },
{ name: 'One', constant: THREE.OneFactor },
{ name: 'SrcColor', constant: THREE.SrcColorFactor },
{ name: 'OneMinusSrcColor', constant: THREE.OneMinusSrcColorFactor },
{ name: 'SrcAlpha', constant: THREE.SrcAlphaFactor },
{ name: 'OneMinusSrcAlpha', constant: THREE.OneMinusSrcAlphaFactor },
{ name: 'DstAlpha', constant: THREE.DstAlphaFactor },
{ name: 'OneMinusDstAlpha', constant: THREE.OneMinusDstAlphaFactor },
{ name: 'DstColor', constant: THREE.DstColorFactor },
{ name: 'OneMinusDstColor', constant: THREE.OneMinusDstColorFactor },
{ name: 'SrcAlphaSaturate', constant: THREE.SrcAlphaSaturateFactor }
];
const dst = [
{ name: 'Zero', constant: THREE.ZeroFactor },
{ name: 'One', constant: THREE.OneFactor },
{ name: 'SrcColor', constant: THREE.SrcColorFactor },
{ name: 'OneMinusSrcColor', constant: THREE.OneMinusSrcColorFactor },
{ name: 'SrcAlpha', constant: THREE.SrcAlphaFactor },
{ name: 'OneMinusSrcAlpha', constant: THREE.OneMinusSrcAlphaFactor },
{ name: 'DstAlpha', constant: THREE.DstAlphaFactor },
{ name: 'OneMinusDstAlpha', constant: THREE.OneMinusDstAlphaFactor },
{ name: 'DstColor', constant: THREE.DstColorFactor },
{ name: 'OneMinusDstColor', constant: THREE.OneMinusDstColorFactor }
];
const geo1 = new THREE.PlaneGeometry( 100, 100 );
const geo2 = new THREE.PlaneGeometry( 100, 25 );
const texture = new THREE.TextureLoader().load( 'textures/lensflare/lensflare0_alpha.png' );
for ( let i = 0; i < dst.length; i ++ ) {
const blendDst = dst[ i ];
for ( let j = 0; j < src.length; j ++ ) {
const blendSrc = src[ j ];
const material = new THREE.MeshBasicMaterial( { map: texture } );
material.transparent = true;
material.blending = THREE.CustomBlending;
material.blendSrc = blendSrc.constant;
material.blendDst = blendDst.constant;
material.blendEquation = THREE.AddEquation;
const x = ( j - src.length / 2 ) * 110;
const z = 0;
const y = ( i - dst.length / 2 ) * 110 + 50;
const mesh = new THREE.Mesh( geo1, material );
mesh.position.set( x, - y, z );
mesh.matrixAutoUpdate = false;
mesh.updateMatrix();
scene.add( mesh );
materials.push( material );
}
}
for ( let j = 0; j < src.length; j ++ ) {
const blendSrc = src[ j ];
const x = ( j - src.length / 2 ) * 110;
const z = 0;
const y = ( 0 - dst.length / 2 ) * 110 + 50;
const mesh = new THREE.Mesh( geo2, generateLabelMaterial( blendSrc.name, 'rgba( 0, 150, 0, 1 )' ) );
mesh.position.set( x, - ( y - 70 ), z );
mesh.matrixAutoUpdate = false;
mesh.updateMatrix();
scene.add( mesh );
}
for ( let i = 0; i < dst.length; i ++ ) {
const blendDst = dst[ i ];
const x = ( 0 - src.length / 2 ) * 110 - 125;
const z = 0;
const y = ( i - dst.length / 2 ) * 110 + 165;
const mesh = new THREE.Mesh( geo2, generateLabelMaterial( blendDst.name, 'rgba( 150, 0, 0, 1 )' ) );
mesh.position.set( x, - ( y - 120 ), z );
mesh.matrixAutoUpdate = false;
mesh.updateMatrix();
scene.add( mesh );
}
// RENDERER
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
// EVENTS
window.addEventListener( 'resize', onWindowResize );
// GUI
//
const gui = new GUI( { width: 300 } );
gui.add( params, 'blendEquation', equations ).onChange( updateBlendEquation );
gui.open();
}
//
function onWindowResize() {
renderer.setSize( window.innerWidth, window.innerHeight );
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
}
//
function generateLabelMaterial( text, bg ) {
const canvas = document.createElement( 'canvas' );
const ctx = canvas.getContext( '2d' );
canvas.width = 128;
canvas.height = 32;
ctx.fillStyle = bg;
ctx.fillRect( 0, 0, 128, 32 );
ctx.fillStyle = 'white';
ctx.font = 'bold 11pt arial';
ctx.fillText( text, 8, 22 );
const map = new THREE.CanvasTexture( canvas );
const material = new THREE.MeshBasicMaterial( { map: map, transparent: true } );
return material;
}
function updateBlendEquation( value ) {
for ( const material of materials ) {
material.blendEquation = value;
}
}
function animate() {
requestAnimationFrame( animate );
const time = Date.now() * 0.00025;
const ox = ( time * - 0.01 * mapBg.repeat.x ) % 1;
const oy = ( time * - 0.01 * mapBg.repeat.y ) % 1;
mapBg.offset.set( ox, oy );
renderer.render( scene, camera );
}
</script>
</body>
</html>