midas
/
threejs-obj-space


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - buffer geometry constructed from geometry</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="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry constructed from geometry<br/>
			by <a target="_blank" href="http://callum.com">Callum Prentice</a>
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';

			import { TrackballControls } from './jsm/controls/TrackballControls.js';

			var camera, scene, renderer, controls, stats;

			init();
			animate();

			function init() {

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

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 45.0, window.innerWidth / window.innerHeight, 100, 1500.0 );
				camera.position.z = 480.0;
				scene.add( camera );

				controls = new TrackballControls( camera, renderer.domElement );
				controls.minDistance = 100.0;
				controls.maxDistance = 800.0;
				controls.dynamicDampingFactor = 0.1;

				scene.add( new THREE.AmbientLight( 0xffffff, 0.2 ) );

				var light = new THREE.PointLight( 0xffffff, 0.7 );
				camera.add( light );

				createScene();

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

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

			}

			function createGeometry() {

				var heartShape = new THREE.Shape(); // From http://blog.burlock.org/html5/130-paths
				var x = 0, y = 0;

				heartShape.moveTo( x + 25, y + 25 );
				heartShape.bezierCurveTo( x + 25, y + 25, x + 20, y, x, y );
				heartShape.bezierCurveTo( x - 30, y, x - 30, y + 35, x - 30, y + 35 );
				heartShape.bezierCurveTo( x - 30, y + 55, x - 10, y + 77, x + 25, y + 95 );
				heartShape.bezierCurveTo( x + 60, y + 77, x + 80, y + 55, x + 80, y + 35 );
				heartShape.bezierCurveTo( x + 80, y + 35, x + 80, y, x + 50, y );
				heartShape.bezierCurveTo( x + 35, y, x + 25, y + 25, x + 25, y + 25 );

				var extrudeSettings = {
					depth: 16,
					bevelEnabled: true,
					bevelSegments: 1,
					steps: 2,
					bevelSize: 1,
					bevelThickness: 1
				};

				var geometry = new THREE.ExtrudeGeometry( heartShape, extrudeSettings );
				geometry.rotateX( Math.PI );
				geometry.scale( 0.4, 0.4, 0.4 );

				return geometry;

			}

			function createScene() {

				var bufferGeometry = new THREE.BufferGeometry();

				var radius = 125;
				var count = 80;

				var positions = [];
				var normals = [];
				var colors = [];

				var vector = new THREE.Vector3();

				var color = new THREE.Color( 0xffffff );
				var heartGeometry = createGeometry();
				var geometry = new THREE.Geometry();

				for ( var i = 1, l = count; i <= l; i ++ ) {

					var phi = Math.acos( - 1 + ( 2 * i ) / l );
					var theta = Math.sqrt( l * Math.PI ) * phi;

					vector.setFromSphericalCoords( radius, phi, theta );

					geometry.copy( heartGeometry );
					geometry.lookAt( vector );
					geometry.translate( vector.x, vector.y, vector.z );

					color.setHSL( ( i / l ), 1.0, 0.7 );

					geometry.faces.forEach( function ( face ) {

						positions.push( geometry.vertices[ face.a ].x );
						positions.push( geometry.vertices[ face.a ].y );
						positions.push( geometry.vertices[ face.a ].z );
						positions.push( geometry.vertices[ face.b ].x );
						positions.push( geometry.vertices[ face.b ].y );
						positions.push( geometry.vertices[ face.b ].z );
						positions.push( geometry.vertices[ face.c ].x );
						positions.push( geometry.vertices[ face.c ].y );
						positions.push( geometry.vertices[ face.c ].z );

						normals.push( face.normal.x );
						normals.push( face.normal.y );
						normals.push( face.normal.z );
						normals.push( face.normal.x );
						normals.push( face.normal.y );
						normals.push( face.normal.z );
						normals.push( face.normal.x );
						normals.push( face.normal.y );
						normals.push( face.normal.z );

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

					} );

				}

				bufferGeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
				bufferGeometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ) );
				bufferGeometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );

				var material = new THREE.MeshPhongMaterial( { shininess: 80, vertexColors: THREE.VertexColors } );

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

			}

			function onWindowResize() {

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

			}

			function animate() {

				requestAnimationFrame( animate );

				controls.update();
				stats.update();

				renderer.render( scene, camera );

			}

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