javascript
/
three.js
огледало от https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - buffer geometry custom attributes - particles</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>
		<div id="container"></div>
		<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry custom attributes - particles</div>

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

		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script type="x-shader/x-vertex" id="vertexshader">

			attribute float size;

			varying vec3 vColor;

			void main() {

				vColor = color;

				vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );

				gl_PointSize = size * ( 300.0 / -mvPosition.z );

				gl_Position = projectionMatrix * mvPosition;

			}

		</script>

		<script type="x-shader/x-fragment" id="fragmentshader">

			uniform sampler2D texture;

			varying vec3 vColor;

			void main() {

				gl_FragColor = vec4( vColor, 1.0 );

				gl_FragColor = gl_FragColor * texture2D( texture, gl_PointCoord );

			}

		</script>


		<script>

		if ( WEBGL.isWebGLAvailable() === false ) {

			document.body.appendChild( WEBGL.getWebGLErrorMessage() );

		}

		var renderer, scene, camera, stats;

		var particleSystem, uniforms, geometry;

		var particles = 100000;

		init();
		animate();

		function init() {

			camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
			camera.position.z = 300;

			scene = new THREE.Scene();

			uniforms = {

				texture: { value: new THREE.TextureLoader().load( "textures/sprites/spark1.png" ) }

			};

			var shaderMaterial = new THREE.ShaderMaterial( {

				uniforms: uniforms,
				vertexShader: document.getElementById( 'vertexshader' ).textContent,
				fragmentShader: document.getElementById( 'fragmentshader' ).textContent,

				blending: THREE.AdditiveBlending,
				depthTest: false,
				transparent: true,
				vertexColors: true

			} );


			var radius = 200;

			geometry = new THREE.BufferGeometry();

			var positions = [];
			var colors = [];
			var sizes = [];

			var color = new THREE.Color();

			for ( var i = 0; i < particles; i ++ ) {

				positions.push( ( Math.random() * 2 - 1 ) * radius );
				positions.push( ( Math.random() * 2 - 1 ) * radius );
				positions.push( ( Math.random() * 2 - 1 ) * radius );

				color.setHSL( i / particles, 1.0, 0.5 );

				colors.push( color.r, color.g, color.b );

				sizes.push( 20 );

			}

			geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
			geometry.addAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
			geometry.addAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ).setDynamic( true ) );

			particleSystem = new THREE.Points( geometry, shaderMaterial );

			scene.add( particleSystem );

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

			var container = document.getElementById( 'container' );
			container.appendChild( renderer.domElement );

			stats = new Stats();
			container.appendChild( stats.dom );

			//

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

		}

		function onWindowResize() {

			camera.aspect = window.innerWidth / window.innerHeight;
			camera.updateProjectionMatrix();

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

		}

		function animate() {

			requestAnimationFrame( animate );

			render();
			stats.update();

		}

		function render() {

			var time = Date.now() * 0.005;

			particleSystem.rotation.z = 0.01 * time;

			var sizes = geometry.attributes.size.array;

			for ( var i = 0; i < particles; i ++ ) {

				sizes[ i ] = 10 * ( 1 + Math.sin( 0.1 * i + time ) );

			}

			geometry.attributes.size.needsUpdate = true;

			renderer.render( scene, camera );

		}

	</script>

</body>
</html>