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- <!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>
- <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();
- 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.colorSpace = THREE.SRGBColorSpace;
- 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' );
- texture.colorSpace = THREE.SRGBColorSpace;
- 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 );
- renderer.setAnimationLoop( animate );
- 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 );
- map.colorSpace = THREE.SRGBColorSpace;
- const material = new THREE.MeshBasicMaterial( { map: map, transparent: true } );
- return material;
- }
- function updateBlendEquation( value ) {
- for ( const material of materials ) {
- material.blendEquation = value;
- }
- }
- function 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>
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