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187 lines
4.6 KiB
187 lines
4.6 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - materials - 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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let camera, scene, renderer;
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let mapBg;
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const textureLoader = new THREE.TextureLoader();
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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( 70, window.innerWidth / window.innerHeight, 1, 1000 );
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camera.position.z = 600;
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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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// OBJECTS
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const blendings = [
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{ name: 'No', constant: THREE.NoBlending },
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{ name: 'Normal', constant: THREE.NormalBlending },
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{ name: 'Additive', constant: THREE.AdditiveBlending },
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{ name: 'Subtractive', constant: THREE.SubtractiveBlending },
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{ name: 'Multiply', constant: THREE.MultiplyBlending }
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];
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const map0 = textureLoader.load( 'textures/uv_grid_opengl.jpg' );
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const map1 = textureLoader.load( 'textures/sprite0.jpg' );
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const map2 = textureLoader.load( 'textures/sprite0.png' );
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const map3 = textureLoader.load( 'textures/lensflare/lensflare0.png' );
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const map4 = textureLoader.load( 'textures/lensflare/lensflare0_alpha.png' );
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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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addImageRow( map0, 300 );
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addImageRow( map1, 150 );
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addImageRow( map2, 0 );
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addImageRow( map3, - 150 );
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addImageRow( map4, - 300 );
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function addImageRow( map, y ) {
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for ( let i = 0; i < blendings.length; i ++ ) {
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const blending = blendings[ i ];
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const material = new THREE.MeshBasicMaterial( { map: map } );
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material.transparent = true;
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material.blending = blending.constant;
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const x = ( i - blendings.length / 2 ) * 110;
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const z = 0;
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let mesh = new THREE.Mesh( geo1, material );
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mesh.position.set( x, y, z );
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scene.add( mesh );
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mesh = new THREE.Mesh( geo2, generateLabelMaterial( blending.name ) );
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mesh.position.set( x, y - 75, z );
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scene.add( mesh );
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}
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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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}
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//
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function onWindowResize() {
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const SCREEN_WIDTH = window.innerWidth;
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const SCREEN_HEIGHT = window.innerHeight;
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renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
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camera.aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
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camera.updateProjectionMatrix();
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}
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function generateLabelMaterial( text ) {
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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 = 'rgba( 0, 0, 0, 0.95 )';
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ctx.fillRect( 0, 0, 128, 32 );
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ctx.fillStyle = 'white';
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ctx.font = 'bold 12pt arial';
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ctx.fillText( text, 10, 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 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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