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 - vector - text</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>
			body {
				background-color: #f0f0f0;
				color: #444;
			}
			a {
				color: #08f;
			}
		</style>
	</head>
	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - Resolution-Independent Vector Fonts. <a href="https://github.com/mrdoob/three.js/issues/4746">info</a>.
		</div>

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

			varying vec2 vUv;
			varying float flip;
			uniform vec3 color;

			float inCurve(vec2 uv) {
				return uv.x * uv.x - uv.y;
			}

			float delta = 0.1;

			void main() {
				float x = inCurve(vUv);

				if (x * flip > 0.) discard;
				gl_FragColor = vec4(color, 1.);
			}

		</script>

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

			varying vec2 vUv;
			attribute float invert;
			varying float flip;

			void main() {

				vUv = uv;
				flip = invert;
				vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
				gl_Position = projectionMatrix * mvPosition;

			}

		</script>

		<script type="module">

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

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

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

			let stats;

			let camera, scene, renderer, controls;

			let group;

			const loader = new THREE.FontLoader();
			loader.load( 'fonts/helvetiker_regular.typeface.json', function ( font ) {

				init( font );
				animate();

			} );

			function init( font ) {

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.set( 50, 100, 500 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xf0f0f0 );

				const theText = '&'; // i % & j b 8

				group = new THREE.Group();
				scene.add( group );

				const textMaterial = new THREE.MeshBasicMaterial( {
					color: new THREE.Color( 0, 0, 1 ),
					side: THREE.DoubleSide,
					wireframe: true
				} );

				const textShapes = font.generateShapes( theText, 180 );

				let geometry = new THREE.ShapeBufferGeometry( textShapes );

				let text = new THREE.Mesh( geometry, textMaterial );
				text.position.x = - 200;
				group.add( text );

				//

				let vA = new THREE.Vector2();
				let vB = new THREE.Vector2();

				function processShape( path ) {

					const pts = []; // bigger area (convex hull)
					const pts2 = []; // smaller area (full solid shapes)
					const beziers = []; // quad bezier points
					const invert = [];
					let z;

					let wind;

					pts.push( path[ 0 ].getPoint( 0, new THREE.Vector2() ) );
					pts2.push( path[ 0 ].getPoint( 0, new THREE.Vector2() ) );

					for ( let i = 0; i < path.length; i ++ ) {

						const curve = path[ i ];
						if ( curve instanceof THREE.LineCurve ) {

							pts.push( curve.v2 );
							pts2.push( curve.v2 );

						} else if ( curve instanceof THREE.QuadraticBezierCurve ) {

							vA = vA.subVectors( curve.v1, curve.v0 );
							vB = vB.subVectors( curve.v2, curve.v1 );
							z = vA.x * vB.y - vA.y * vB.x; // z component of cross Production
							wind = z < 0; // clockwise/anticlock wind

							if ( wind ) {

								pts.push( curve.v1 );
								pts.push( curve.v2 );
								pts2.push( curve.v2 );

							} else {

								pts.push( curve.v2 );
								pts2.push( curve.v1 );
								pts2.push( curve.v2 );

							}

							const flip = wind ? 1 : - 1;
							// if (reverse) flip *= -1;

							invert.push( flip, flip, flip );
							beziers.push( curve.v0, curve.v1, curve.v2 );

						}

					}

					return {
						pts: pts,
						pts2: pts2,
						beziers: beziers,
						invert: invert
					};

				}

				let pts, pts2;
				let subshape;
				let convexhullShape;
				let solidShape;
				const convexhullShapeGroup = [];
				const solidShapeGroup = [];

				let beziers = [], invert = [];
				let process;
				let hole;

				for ( let s = 0; s < textShapes.length; s ++ ) {

					subshape = textShapes[ s ];
					process = processShape( subshape.curves );

					pts = process.pts;
					pts2 = process.pts2;
					beziers = beziers.concat( process.beziers );
					invert = invert.concat( process.invert );

					convexhullShape = new THREE.Shape( pts );
					solidShape = new THREE.Shape( pts2 );

					convexhullShapeGroup.push( convexhullShape );
					solidShapeGroup.push( solidShape );

					for ( let i = 0; i < subshape.holes.length; i ++ ) {

						hole = subshape.holes[ i ];

						process = processShape( hole.curves );

						pts = process.pts;
						pts2 = process.pts2;
						beziers = beziers.concat( process.beziers );
						invert = invert.concat( process.invert );

						convexhullShape.holes.push( new THREE.Shape( pts ) );
						solidShape.holes.push( new THREE.Shape( pts2 ) );

					}

				} // end of subshape

				const bezierGeometry = new THREE.BufferGeometry();
				const vertices = [];
				const uvs = [];

				for ( let i = 0; i < beziers.length; i ++ ) {

					const p = beziers[ i ];
					vertices.push( p.x, p.y, 0 );

				}

				for ( let i = 0; i < beziers.length; i += 3 ) {

					uvs.push( 0, 0, 0.5, 0, 1, 1 );

				}

				bezierGeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
				bezierGeometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( uvs, 2 ) );
				bezierGeometry.setAttribute( 'invert', new THREE.Float32BufferAttribute( invert, 1 ) );

				geometry = new THREE.ShapeBufferGeometry( convexhullShapeGroup );

				text = new THREE.Mesh( geometry, textMaterial );
				text.position.x = 200;
				group.add( text );

				geometry = new THREE.ShapeBufferGeometry( solidShapeGroup );

				text = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: new THREE.Color( 1, 0, 0 ), side: THREE.DoubleSide, wireframe: true } ) );
				text.position.x = 200;
				group.add( text );

				//

				const newMaterial = new THREE.ShaderMaterial( {
					uniforms: {
						color: { value: new THREE.Color( 0.45 * 0xffffff ) }
					},
					vertexShader: document.getElementById( 'vs' ).textContent,
					fragmentShader: document.getElementById( 'fs' ).textContent,
					side: THREE.DoubleSide
				} );

				text = new THREE.Mesh( bezierGeometry, newMaterial );
				text.rotation.y = Math.PI * 2;

				group.add( text );

				//


				geometry = new THREE.ShapeBufferGeometry( solidShapeGroup );

				text = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: 0.45 * 0xffffff, side: THREE.DoubleSide } ) );
				text.rotation.y = Math.PI * 2;

				group.add( text );

				//

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

				controls = new OrbitControls( camera, renderer.domElement );
				controls.target.set( 50, 100, 0 );
				controls.update();

				stats = new Stats();
				document.body.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() {

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>