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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - lines - splines</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <style>
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+ body {
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+ background-color: #000000;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+
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+ a {
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+ color:#0078ff;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 10px; width: 100%;
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+ color: #ffffff;
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+ padding: 5px;
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+ font-family: Monospace;
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+ font-size: 13px;
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+ text-align: center;
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+ z-index:100;
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+ }
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+
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+ a {
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+ color: orange;
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+ text-decoration: none;
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+ }
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+
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+ a:hover {
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+ color: #0080ff;
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+ }
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+
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+ </style>
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+ </head>
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+ <body>
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+
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+ <div id="info">
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+ <a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - splines WebGL demo
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+ [<a href="http://en.wikipedia.org/wiki/Hilbert_curve">Hilbert curve</a> thanks to <a href="http://www.openprocessing.org/visuals/?visualID=15599">Thomas Diewald</a>]
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+ </div>
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+
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+ <script src="../build/three.js"></script>
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+
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+ <script src="js/geometries/hilbert3D.js"></script>
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+
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+ <script src="js/Detector.js"></script>
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+
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+ <script>
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+
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+ if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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+
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+ var mouseX = 0, mouseY = 0,
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+
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+ windowHalfX = window.innerWidth / 2,
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+ windowHalfY = window.innerHeight / 2,
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+
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+ camera, scene, renderer, material;
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ var i, container;
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+
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+ container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ camera = new THREE.PerspectiveCamera( 33, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.z = 1000;
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+
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+ scene = new THREE.Scene();
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ container.appendChild( renderer.domElement );
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+
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+ var hilbertPoints = hilbert3D( new THREE.Vector3( 0,0,0 ), 200.0, 1, 0, 1, 2, 3, 4, 5, 6, 7 );
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+
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+ // Colors with BufferGeometry
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+
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+ var buffGeometry0 = new THREE.BufferGeometry(),
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+ buffGeometry1 = new THREE.BufferGeometry(),
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+ buffGeometry2 = new THREE.BufferGeometry();
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+
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+ var subdivisions = 6;
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+
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+ var position = [],
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+ colorArray0 = [],
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+ colorArray1 = [],
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+ colorArray2 = [];
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+
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+ var point = new THREE.Vector3();
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+ var color = new THREE.Color();
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+
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+ var spline = new THREE.CatmullRomCurve3( hilbertPoints );
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+
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+ for ( i = 0; i < hilbertPoints.length * subdivisions; i++ ) {
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+
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+ var t = i / ( hilbertPoints.length * subdivisions );
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+ spline.getPoint( t, point );
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+
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+ position.push( point.x, point.y, point.z );
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+
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+ color.setHSL( 0.6, 1.0, Math.max( 0, - point.x / 200 ) + 0.5 );
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+ colorArray0.push( color.r, color.g, color.b );
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+
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+ color.setHSL( 0.9, 1.0, Math.max( 0, - point.y / 200 ) + 0.5 );
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+ colorArray1.push( color.r, color.g, color.b );
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+
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+ color.setHSL( i / ( hilbertPoints.length * subdivisions ), 1.0, 0.5 );
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+ colorArray2.push( color.r, color.g, color.b );
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+
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+ }
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+
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+ buffGeometry0.addAttribute( 'position', new THREE.Float32BufferAttribute( position, 3 ) );
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+ buffGeometry1.addAttribute( 'position', new THREE.Float32BufferAttribute( position, 3 ) );
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+ buffGeometry2.addAttribute( 'position', new THREE.Float32BufferAttribute( position, 3 ) );
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+
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+ buffGeometry0.addAttribute( 'color', new THREE.Float32BufferAttribute( colorArray0, 3 ) );
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+ buffGeometry1.addAttribute( 'color', new THREE.Float32BufferAttribute( colorArray1, 3 ) );
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+ buffGeometry2.addAttribute( 'color', new THREE.Float32BufferAttribute( colorArray2, 3 ) );
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+
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+ // Colors with Geometry
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+
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+ var geometry0 = new THREE.Geometry(),
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+ geometry2 = new THREE.Geometry(),
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+ geometry3 = new THREE.Geometry();
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+
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+ var colors0 = [],
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+ colors1 = [],
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+ colors2 = [];
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+
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+ for ( i = 0; i < hilbertPoints.length; i++ ) {
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+
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+ geometry0.vertices.push( hilbertPoints[ i ] );
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+
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+ colors0[ i ] = new THREE.Color( 0xffffff );
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+ colors0[ i ].setHSL( 0.6, 1.0, Math.max( 0, ( 200 - hilbertPoints[ i ].x ) / 400 ) * 0.5 + 0.5 );
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+
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+ colors1[ i ] = new THREE.Color( 0xffffff );
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+ colors1[ i ].setHSL( 0.3, 1.0, Math.max( 0, ( 200 + hilbertPoints[ i ].x ) / 400 ) * 0.5 );
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+
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+ colors2[ i ] = new THREE.Color( 0xffffff );
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+ colors2[ i ].setHSL( i / hilbertPoints.length, 1.0, 0.5 );
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+
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+ }
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+
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+ geometry2.vertices = geometry3.vertices = geometry0.vertices;
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+
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+ geometry0.colors = colors0;
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+ geometry2.colors = colors1;
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+ geometry3.colors = colors2;
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+
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+ // Create lines and add to scene
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+
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+ material = new THREE.LineBasicMaterial( { color: 0xffffff, opacity: 1, linewidth: 3, vertexColors: THREE.VertexColors } );
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+
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+ var line, p, scale = 0.3, d = 225;
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+ var parameters = [
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+ [ material, scale * 1.5, [ - d, - d / 2, 0 ], buffGeometry0 ],
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+ [ material, scale * 1.5, [ 0, - d / 2, 0 ], buffGeometry1 ],
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+ [ material, scale * 1.5, [ d, - d / 2, 0 ], buffGeometry2 ],
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+
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+ [ material, scale * 1.5, [ - d, d / 2, 0 ], geometry0 ],
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+ [ material, scale * 1.5, [ 0, d / 2, 0 ], geometry2 ],
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+ [ material, scale * 1.5, [ d, d / 2, 0 ], geometry3 ],
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+ ];
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+
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+ for ( i = 0; i < parameters.length; i++ ) {
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+
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+ p = parameters[ i ];
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+ line = new THREE.Line( p[ 3 ], p[ 0 ] );
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+ line.scale.x = line.scale.y = line.scale.z = p[ 1 ];
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+ line.position.x = p[ 2 ][ 0 ];
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+ line.position.y = p[ 2 ][ 1 ];
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+ line.position.z = p[ 2 ][ 2 ];
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+ scene.add( line );
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+
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+ }
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+
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+ // Input Event Listeners
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+
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+ document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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+ document.addEventListener( 'touchstart', onDocumentTouchStart, false );
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+ document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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+
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+ // Resize Event Listener
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ windowHalfX = window.innerWidth / 2;
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+ windowHalfY = window.innerHeight / 2;
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ //
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+
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+ function onDocumentMouseMove( event ) {
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+
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+ mouseX = event.clientX - windowHalfX;
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+ mouseY = event.clientY - windowHalfY;
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+ }
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+
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+ function onDocumentTouchStart( event ) {
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+
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+ if ( event.touches.length > 1 ) {
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+
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+ event.preventDefault();
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+
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+ mouseX = event.touches[ 0 ].pageX - windowHalfX;
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+ mouseY = event.touches[ 0 ].pageY - windowHalfY;
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+ }
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+ }
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+
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+ function onDocumentTouchMove( event ) {
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+
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+ if ( event.touches.length == 1 ) {
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+
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+ event.preventDefault();
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+
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+ mouseX = event.touches[ 0 ].pageX - windowHalfX;
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+ mouseY = event.touches[ 0 ].pageY - windowHalfY;
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+ }
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+
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+ }
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+
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+ //
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+ render();
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+
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+ }
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+
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+ function render() {
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+
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+ camera.position.x += ( mouseX - camera.position.x ) * .05;
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+ camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;
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+
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+ camera.lookAt( scene.position );
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+
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+ var time = Date.now() * 0.0005;
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+
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+ for ( var i = 0; i < scene.children.length; i ++ ) {
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+
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+ var object = scene.children[ i ];
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+
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+ if ( object instanceof THREE.Line ) {
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+
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+ object.rotation.y = time * ( i % 2 ? 1 : -1 );
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+
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+ }
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+
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+ }
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+ </body>
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+</html>
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Xander Luciano