javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - buffergeometry</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: #cccccc;
				font-family:Monospace;
				font-size:13px;
				text-align:center;

				background-color: #000000;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
			}

			a {

				color: #0080ff;
			}

		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> webgl - buffergeometry</div>

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

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

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var container, stats;

			var camera, scene, renderer;

			var mesh;

			init();
			animate();

			function init() {

				container = document.getElementById( 'container' );

				//

				camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 4000 );
				camera.position.z = 2750;

				scene = new THREE.Scene();


        var segments = 10000;

        var geometry = new THREE.BufferGeometry();
        var material = new THREE.LineBasicMaterial({ vertexColors: true });

        geometry.attributes = {
          position: {
            itemSize: 3,
            array: new Float32Array(segments * 3),
            numItems: segments * 3
          },
          color: {
            itemSize: 3,
            array: new Float32Array(segments * 3),
            numItems: segments * 3
          }
        };

        var positions = geometry.attributes.position.array;
        var colors = geometry.attributes.color.array;

        var r = 800;
        
        for (i = 0; i < segments; i++) {

          var lat = i/segments*Math.PI*2;
          var lon = i/segments*Math.PI*2000;

          x = Math.random()*r-r/2;
          y = Math.random()*r-r/2;
          z = Math.random()*r-r/2;

          // positions

          positions[ i*3 ] = x;
          positions[ i*3 + 1 ] = y;
          positions[ i*3 + 2 ] = z;

          // colors

          colors[ i*3 ] = ( x / r ) + 0.5;
          colors[ i*3 + 1 ] = ( y / r ) + 0.5;
          colors[ i*3 + 2 ] = ( z / r ) + 0.5;

        }

				geometry.computeBoundingSphere();

				mesh = new THREE.Line( geometry, material );
				scene.add( mesh );

				//

				renderer = new THREE.WebGLRenderer( { antialias: false, clearColor: 0x000000, clearAlpha: 0, alpha: true } );
				renderer.setSize( window.innerWidth, window.innerHeight );

				renderer.gammaInput = true;
				renderer.gammaOutput = true;
				renderer.physicallyBasedShading = true;

				container.appendChild( renderer.domElement );

				//

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				container.appendChild( stats.domElement );

				//

				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() * 0.001;

				mesh.rotation.x = time * 0.25;
				mesh.rotation.y = time * 0.5;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>