javascript
/
three.js
oglindă de https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - sprites - premultiplied alpha</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 {
				padding:0;
				margin:0;
				font-weight: bold;
				overflow:hidden;
			}
		</style>
	</head>

	<body>


    <div id="info">
        <a href="http://threejs.org" target="_blank">three.js</a> - webgl sprites alpha example -
        left is without premultiplied alpha, right is with premultiplied alpha
    </div>

		<script src="../build/three.js"></script>

		<script>

			var camera, scene, renderer;

			init();
			animate();

			function init() {

				var width = window.innerWidth;
				var height = window.innerHeight;

				camera = new THREE.PerspectiveCamera( 60, width / height, 1, 1000 );
				camera.position.z = 100;

				scene = new THREE.Scene();

				// create sprites
				var textureLoader = new THREE.TextureLoader();
				var spriteTexture = textureLoader.load( "textures/sprite3.png" );
				var spriteTexturePremultiplied = textureLoader.load( "textures/sprite3.png" );
				spriteTexturePremultiplied.premultiplyAlpha = true;

				var materialPremultiplied = new THREE.SpriteMaterial( {
                    map: spriteTexturePremultiplied,
				    premultipliedAlpha: true
				} );
				var spritePremultiplied = new THREE.Sprite( materialPremultiplied );
				spritePremultiplied.scale.set( 40, 40, 40 );
				spritePremultiplied.position.set( 20, 0, 0 );
				scene.add( spritePremultiplied );

				var materialNonPremultiplied = new THREE.SpriteMaterial( { map: spriteTexture } );
				var spriteNonPremultiplied = new THREE.Sprite( materialNonPremultiplied );
				spriteNonPremultiplied.scale.set( 40, 40, 40 );
				spriteNonPremultiplied.position.set( -20, 0, 0 );
				scene.add( spriteNonPremultiplied );

				// renderer

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setClearColor( new THREE.Color( 'white' ) );

				document.body.appendChild( renderer.domElement );

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				var width = window.innerWidth;
				var height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestAnimationFrame( animate );
				render();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>