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 - indexed</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">
		<style>
			a {
				color: #08f;
			}
		</style>
	</head>
	<body>

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

		<script src="../build/three.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 camera, scene, renderer, stats;

			var mesh;

			init();
			animate();

			function init() {

				//

				camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
				camera.position.z = 64;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x050505 );

				//

				var light = new THREE.HemisphereLight();
				scene.add( light );

				//

				var geometry = new THREE.BufferGeometry();

				var indices = [];

				var vertices = [];
				var normals = [];
				var colors = [];

				var size = 20;
				var segments = 10;

				var halfSize = size / 2;
				var segmentSize = size / segments;

				// generate vertices, normals and color data for a simple grid geometry

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

					var y = ( i * segmentSize ) - halfSize;

					for ( var j = 0; j <= segments; j ++ ) {

						var x = ( j * segmentSize ) - halfSize;

						vertices.push( x, - y, 0 );
						normals.push( 0, 0, 1 );

						var r = ( x / size ) + 0.5;
						var g = ( y / size ) + 0.5;

						colors.push( r, g, 1 );

					}

				}

				// generate indices (data for element array buffer)

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

					for ( var j = 0; j < segments; j ++ ) {

						var a = i * ( segments + 1 ) + ( j + 1 );
						var b = i * ( segments + 1 ) + j;
						var c = ( i + 1 ) * ( segments + 1 ) + j;
						var d = ( i + 1 ) * ( segments + 1 ) + ( j + 1 );

						// generate two faces (triangles) per iteration

						indices.push( a, b, d ); // face one
						indices.push( b, c, d ); // face two

					}

				}

				//

				geometry.setIndex( indices );
				geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
				geometry.addAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ) );
				geometry.addAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );

				var material = new THREE.MeshPhongMaterial( {
					side: THREE.DoubleSide,
					vertexColors: THREE.VertexColors
				} );

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

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				//

				stats = new Stats();
				document.body.appendChild( stats.dom );

				//

				var gui = new dat.GUI();
				gui.add( material, 'wireframe' );

				//

				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>