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webgl_materials_transparency.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>threejs webgl - materials - transparency</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
color: #fff;
font-family:Monospace;
font-size:13px;
text-align:center;
background-color: #000;
margin: 0px;
overflow: hidden;
}
a { color: #eee }
#info {
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">threejs</a> - Transparency with Premultiplied Alpha (right) and without (left)<br /> using RGBA8 Buffers by <a href="http://clara.io/" target="_blank" rel="noopener">Ben Houston</a>.</div>
<script src="../build/three.js"></script>
<script src="js/controls/OrbitControls.js"></script>
<script src="js/WebGL.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="js/libs/dat.gui.min.js"></script>
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var params = { opacity: 0.25 };
var container, stats;
var camera, scene, renderer, controls;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 2000 );
camera.position.set( 0.0, 40, 40 * 3.5 );
scene = new THREE.Scene();
//
var geometry = new THREE.SphereBufferGeometry( 18, 30, 30 );
var material1 = new THREE.MeshStandardMaterial( {
opacity: params.opacity,
transparent: true
} );
var material2 = new THREE.MeshStandardMaterial( {
opacity: params.opacity,
premultipliedAlpha: true,
transparent: true
} );
var textureLoader = new THREE.TextureLoader();
textureLoader.load( "textures/hardwood2_diffuse.jpg", function ( map ) {
map.anisotropy = 8;
material1.map = map;
material1.needsUpdate = true;
material2.map = map;
material2.needsUpdate = true;
} );
var textureLoader = new THREE.TextureLoader();
textureLoader.load( "textures/hardwood2_roughness.jpg", function ( map ) {
map.anisotropy = 8;
material1.roughnessMap = map;
material1.needsUpdate = true;
material2.roughnessMap = map;
material2.needsUpdate = true;
} );
var mesh = new THREE.Mesh( geometry, material1 );
mesh.position.x = - 25.0;
scene.add( mesh );
var mesh = new THREE.Mesh( geometry, material2 );
mesh.position.x = 25.0;
scene.add( mesh );
//
var geometry = new THREE.PlaneBufferGeometry( 800, 800 );
var material = new THREE.MeshStandardMaterial( { color: 0x333333 } );
var mesh = new THREE.Mesh( geometry, material );
mesh.position.y = - 50;
mesh.rotation.x = - Math.PI * 0.5;
scene.add( mesh );
// Lights
var spotLight = new THREE.SpotLight( 0xff8888 );
spotLight.position.set( 100, 200, 100 );
spotLight.angle = Math.PI / 6;
spotLight.penumbra = 0.9;
scene.add( spotLight );
var spotLight = new THREE.SpotLight( 0x8888ff );
spotLight.position.set( - 100, - 200, - 100 );
spotLight.angle = Math.PI / 6;
spotLight.penumbra = 0.9;
scene.add( spotLight );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.shadowMap.enabled = true;
container.appendChild( renderer.domElement );
renderer.gammaInput = true;
renderer.gammaOutput = true;
stats = new Stats();
container.appendChild( stats.dom );
controls = new THREE.OrbitControls( camera, renderer.domElement );
window.addEventListener( 'resize', onWindowResize, false );
var gui = new dat.GUI();
gui.add( params, 'opacity', 0, 1 ).onChange( function () {
material1.opacity = params.opacity;
material2.opacity = params.opacity;
} );
gui.open();
}
function onWindowResize() {
var width = window.innerWidth;
var height = window.innerHeight;
camera.aspect = width / height;
camera.updateProjectionMatrix();
renderer.setSize( width, height );
}
//
function animate() {
requestAnimationFrame( animate );
stats.begin();
render();
stats.end();
}
function render() {
for ( var i = 0, l = scene.children.length; i < l; i ++ ) {
var object = scene.children[ i ];
if ( object.geometry instanceof THREE.SphereBufferGeometry ) {
object.rotation.x = performance.now() * 0.0002;
object.rotation.y = - performance.now() * 0.0002;
}
}
renderer.render( scene, camera );
}
</script>
</body>
</html>