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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - materials - 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';
let camera, scene, renderer;
let mapBg;
const textureLoader = new THREE.TextureLoader();
init();
animate();
function init() {
// CAMERA
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.z = 600;
// 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;
// OBJECTS
const blendings = [
{ name: 'No', constant: THREE.NoBlending },
{ name: 'Normal', constant: THREE.NormalBlending },
{ name: 'Additive', constant: THREE.AdditiveBlending },
{ name: 'Subtractive', constant: THREE.SubtractiveBlending },
{ name: 'Multiply', constant: THREE.MultiplyBlending }
];
const map0 = textureLoader.load( 'textures/uv_grid_opengl.jpg' );
const map1 = textureLoader.load( 'textures/sprite0.jpg' );
const map2 = textureLoader.load( 'textures/sprite0.png' );
const map3 = textureLoader.load( 'textures/lensflare/lensflare0.png' );
const map4 = textureLoader.load( 'textures/lensflare/lensflare0_alpha.png' );
const geo1 = new THREE.PlaneGeometry( 100, 100 );
const geo2 = new THREE.PlaneGeometry( 100, 25 );
addImageRow( map0, 300 );
addImageRow( map1, 150 );
addImageRow( map2, 0 );
addImageRow( map3, - 150 );
addImageRow( map4, - 300 );
function addImageRow( map, y ) {
for ( let i = 0; i < blendings.length; i ++ ) {
const blending = blendings[ i ];
const material = new THREE.MeshBasicMaterial( { map: map } );
material.transparent = true;
material.blending = blending.constant;
const x = ( i - blendings.length / 2 ) * 110;
const z = 0;
let mesh = new THREE.Mesh( geo1, material );
mesh.position.set( x, y, z );
scene.add( mesh );
mesh = new THREE.Mesh( geo2, generateLabelMaterial( blending.name ) );
mesh.position.set( x, y - 75, z );
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 );
}
//
function onWindowResize() {
const SCREEN_WIDTH = window.innerWidth;
const SCREEN_HEIGHT = window.innerHeight;
renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
camera.aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
camera.updateProjectionMatrix();
}
function generateLabelMaterial( text ) {
const canvas = document.createElement( 'canvas' );
const ctx = canvas.getContext( '2d' );
canvas.width = 128;
canvas.height = 32;
ctx.fillStyle = 'rgba( 0, 0, 0, 0.95 )';
ctx.fillRect( 0, 0, 128, 32 );
ctx.fillStyle = 'white';
ctx.font = 'bold 12pt arial';
ctx.fillText( text, 10, 22 );
const map = new THREE.CanvasTexture( canvas );
const material = new THREE.MeshBasicMaterial( { map: map, transparent: true } );
return material;
}
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>