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257 lines
6.8 KiB
257 lines
6.8 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - materials - custom blending</title>
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<meta charset="utf-8">
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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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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let camera, scene, renderer;
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let mapBg;
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const materials = [];
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const params = {
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blendEquation: THREE.AddEquation
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};
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const equations = { Add: THREE.AddEquation, Subtract: THREE.SubtractEquation, ReverseSubtract: THREE.ReverseSubtractEquation, Min: THREE.MinEquation, Max: THREE.MaxEquation };
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init();
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animate();
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function init() {
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// CAMERA
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camera = new THREE.PerspectiveCamera( 80, window.innerWidth / window.innerHeight, 1, 1000 );
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camera.position.z = 700;
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// SCENE
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scene = new THREE.Scene();
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// BACKGROUND
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const canvas = document.createElement( 'canvas' );
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const ctx = canvas.getContext( '2d' );
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canvas.width = canvas.height = 128;
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ctx.fillStyle = '#ddd';
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ctx.fillRect( 0, 0, 128, 128 );
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ctx.fillStyle = '#555';
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ctx.fillRect( 0, 0, 64, 64 );
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ctx.fillStyle = '#999';
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ctx.fillRect( 32, 32, 32, 32 );
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ctx.fillStyle = '#555';
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ctx.fillRect( 64, 64, 64, 64 );
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ctx.fillStyle = '#777';
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ctx.fillRect( 96, 96, 32, 32 );
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mapBg = new THREE.CanvasTexture( canvas );
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mapBg.wrapS = mapBg.wrapT = THREE.RepeatWrapping;
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mapBg.repeat.set( 64, 32 );
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scene.background = mapBg;
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// FOREGROUND OBJECTS
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const src = [
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{ name: 'Zero', constant: THREE.ZeroFactor },
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{ name: 'One', constant: THREE.OneFactor },
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{ name: 'SrcColor', constant: THREE.SrcColorFactor },
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{ name: 'OneMinusSrcColor', constant: THREE.OneMinusSrcColorFactor },
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{ name: 'SrcAlpha', constant: THREE.SrcAlphaFactor },
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{ name: 'OneMinusSrcAlpha', constant: THREE.OneMinusSrcAlphaFactor },
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{ name: 'DstAlpha', constant: THREE.DstAlphaFactor },
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{ name: 'OneMinusDstAlpha', constant: THREE.OneMinusDstAlphaFactor },
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{ name: 'DstColor', constant: THREE.DstColorFactor },
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{ name: 'OneMinusDstColor', constant: THREE.OneMinusDstColorFactor },
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{ name: 'SrcAlphaSaturate', constant: THREE.SrcAlphaSaturateFactor }
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];
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const dst = [
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{ name: 'Zero', constant: THREE.ZeroFactor },
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{ name: 'One', constant: THREE.OneFactor },
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{ name: 'SrcColor', constant: THREE.SrcColorFactor },
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{ name: 'OneMinusSrcColor', constant: THREE.OneMinusSrcColorFactor },
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{ name: 'SrcAlpha', constant: THREE.SrcAlphaFactor },
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{ name: 'OneMinusSrcAlpha', constant: THREE.OneMinusSrcAlphaFactor },
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{ name: 'DstAlpha', constant: THREE.DstAlphaFactor },
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{ name: 'OneMinusDstAlpha', constant: THREE.OneMinusDstAlphaFactor },
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{ name: 'DstColor', constant: THREE.DstColorFactor },
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{ name: 'OneMinusDstColor', constant: THREE.OneMinusDstColorFactor }
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];
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const geo1 = new THREE.PlaneGeometry( 100, 100 );
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const geo2 = new THREE.PlaneGeometry( 100, 25 );
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const texture = new THREE.TextureLoader().load( 'textures/lensflare/lensflare0_alpha.png' );
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for ( let i = 0; i < dst.length; i ++ ) {
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const blendDst = dst[ i ];
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for ( let j = 0; j < src.length; j ++ ) {
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const blendSrc = src[ j ];
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const material = new THREE.MeshBasicMaterial( { map: texture } );
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material.transparent = true;
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material.blending = THREE.CustomBlending;
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material.blendSrc = blendSrc.constant;
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material.blendDst = blendDst.constant;
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material.blendEquation = THREE.AddEquation;
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const x = ( j - src.length / 2 ) * 110;
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const z = 0;
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const y = ( i - dst.length / 2 ) * 110 + 50;
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const mesh = new THREE.Mesh( geo1, material );
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mesh.position.set( x, - y, z );
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mesh.matrixAutoUpdate = false;
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mesh.updateMatrix();
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scene.add( mesh );
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materials.push( material );
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}
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}
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for ( let j = 0; j < src.length; j ++ ) {
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const blendSrc = src[ j ];
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const x = ( j - src.length / 2 ) * 110;
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const z = 0;
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const y = ( 0 - dst.length / 2 ) * 110 + 50;
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const mesh = new THREE.Mesh( geo2, generateLabelMaterial( blendSrc.name, 'rgba( 0, 150, 0, 1 )' ) );
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mesh.position.set( x, - ( y - 70 ), z );
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mesh.matrixAutoUpdate = false;
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mesh.updateMatrix();
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scene.add( mesh );
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}
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for ( let i = 0; i < dst.length; i ++ ) {
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const blendDst = dst[ i ];
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const x = ( 0 - src.length / 2 ) * 110 - 125;
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const z = 0;
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const y = ( i - dst.length / 2 ) * 110 + 165;
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const mesh = new THREE.Mesh( geo2, generateLabelMaterial( blendDst.name, 'rgba( 150, 0, 0, 1 )' ) );
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mesh.position.set( x, - ( y - 120 ), z );
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mesh.matrixAutoUpdate = false;
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mesh.updateMatrix();
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scene.add( mesh );
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}
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// RENDERER
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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// EVENTS
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window.addEventListener( 'resize', onWindowResize );
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// GUI
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//
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const gui = new GUI( { width: 300 } );
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gui.add( params, 'blendEquation', equations ).onChange( updateBlendEquation );
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gui.open();
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}
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//
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function onWindowResize() {
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renderer.setSize( window.innerWidth, window.innerHeight );
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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}
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//
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function generateLabelMaterial( text, bg ) {
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const canvas = document.createElement( 'canvas' );
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const ctx = canvas.getContext( '2d' );
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canvas.width = 128;
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canvas.height = 32;
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ctx.fillStyle = bg;
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ctx.fillRect( 0, 0, 128, 32 );
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ctx.fillStyle = 'white';
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ctx.font = 'bold 11pt arial';
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ctx.fillText( text, 8, 22 );
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const map = new THREE.CanvasTexture( canvas );
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const material = new THREE.MeshBasicMaterial( { map: map, transparent: true } );
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return material;
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}
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function updateBlendEquation( value ) {
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for ( const material of materials ) {
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material.blendEquation = value;
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}
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}
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function animate() {
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requestAnimationFrame( animate );
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const time = Date.now() * 0.00025;
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const ox = ( time * - 0.01 * mapBg.repeat.x ) % 1;
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const oy = ( time * - 0.01 * mapBg.repeat.y ) % 1;
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mapBg.offset.set( ox, oy );
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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