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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 - geometry - Subdivisions with Catmull-Clark</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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+ font-family: Monospace;
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+ background-color: #f0f0f0;
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+ margin: 0px;
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+ overflow: hidden;
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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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+ <script src="../build/three.js"></script>
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+ <script src="js/libs/stats.min.js"></script>
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+ <script src="fonts/helvetiker_regular.typeface.js"></script>
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+
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+ <script>
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+
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+ var container, stats;
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+
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+ var camera, scene, renderer;
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+
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+ var cube, plane;
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+
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+ var targetYRotation = targetXRotation = 0;
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+ var targetYRotationOnMouseDown = targetXRotationOnMouseDown = 0;
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+
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+ var mouseX = 0, mouseY = 0;
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+ var mouseXOnMouseDown = 0;
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+
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+ var windowHalfX = window.innerWidth / 2;
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+ var windowHalfY = window.innerHeight / 2;
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+
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+
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+ // Create new object by parameters
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+
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+ var createSomething = function( klass, args ) {
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+
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+ var F = function( klass, args ) {
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+
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+ return klass.apply( this, args );
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+
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+ }
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+
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+ F.prototype = klass.prototype;
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+
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+ return new F( klass, args );
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+
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+ };
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+
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+
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+ // Cube
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+
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+ var materials = [];
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+
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+ for ( var i = 0; i < 6; i ++ ) {
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+
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+ materials.push( [ new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff, wireframe: false } ) ] );
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+
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+ }
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+
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+
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+
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+ var geometriesParams = [
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+
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+ { type: 'CubeGeometry', args: [ 200, 200, 200, 2, 2, 2, materials ] },
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+ { type: 'TorusGeometry', args: [ 100, 60, 12, 12 ] },
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+ { type: 'TorusKnotGeometry', args: [ ] },
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+ { type: 'SphereGeometry', args: [ 100, 12, 12 ] },
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+ { type: 'SphereGeometry', args: [ 100, 5, 5 ] },
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+ { type: 'SphereGeometry', args: [ 100, 13, 13 ] },
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+ { type: 'IcosahedronGeometry', args: [ 100, 1 ] },
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+ { type: 'CylinderGeometry', args: [ 25, 75, 200, 8, 3 ]} ,
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+ { type: 'OctahedronGeometry', args: [200, 0] },
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+ { type: 'LatheGeometry', args: [ [
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+ new THREE.Vector3(0,0,-100),
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+ new THREE.Vector3(0,50,-50),
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+ new THREE.Vector3(0,10,0),
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+ new THREE.Vector3(0,50,050),
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+ new THREE.Vector3(0,0,100) ] ]},
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+ { type: 'TextGeometry', args: ['&', {
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+ size: 200,
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+ height: 50,
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+ curveSegments: 1,
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+ font: "helvetiker"
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+
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+ }]},
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+ { type: 'PlaneGeometry', args: [ 200, 200, 4, 4 ] }
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+
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+ ];
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+
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+ var info;
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+ var geometryIndex = 0;
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+
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+ // start scene
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+
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+ init();
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+ animate();
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+
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+ function nextGeometry() {
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+
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+ geometryIndex ++;
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+
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+ if ( geometryIndex > geometriesParams.length - 1 ) {
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+
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+ geometryIndex = 0;
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+
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+ }
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+
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+ addStuff();
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+
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+ }
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+
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+ function switchGeometry(i) {
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+
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+ geometryIndex = i;
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+
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+ addStuff();
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+ }
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+
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+ function updateInfo() {
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+
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+ var params = geometriesParams[ geometryIndex ];
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+
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+ var dropdown = '<select id="dropdown" onchange="switchGeometry(this.value)">';
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+
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+ for ( i = 0; i < geometriesParams.length; i ++ ) {
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+ dropdown += '<option value="' + i + '"';
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+
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+ dropdown += (geometryIndex == i) ? ' selected' : '';
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+
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+ dropdown += '>' + geometriesParams[i].type + '</option>';
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+ }
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+
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+ dropdown += '</select>';
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+
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+ var text =
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+ 'Drag to spin THREE.' + params.type +
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+ '<br>' +
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+ '<br>Geometry: ' + dropdown + ' <a href="#" onclick="nextGeometry();return false;">next</a>';
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+
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+ text +=
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+ '<br><br><font color="3333FF">Blue Arrows: Face Normals</font>' +
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+ '<br><font color="FF3333">Red Arrows: Vertex Normals before Geometry.mergeVertices</font>' +
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+ '<br>Black Arrows: Vertex Normals after Geometry.mergeVertices';
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+
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+ info.innerHTML = text;
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+
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+ }
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+
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+ function addStuff() {
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+
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+ if ( window.group !== undefined ) {
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+
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+ scene.remove( group );
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+
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+ }
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+
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+
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+
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+ var params = geometriesParams[ geometryIndex ];
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+
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+ geometry = createSomething( THREE[ params.type ], params.args );
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+
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+ // scale geometry to a uniform size
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+ geometry.computeBoundingSphere();
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+
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+ var scaleFactor = 160 / geometry.boundingSphere.radius;
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+ geometry.applyMatrix( new THREE.Matrix4().makeScale( new THREE.Vector3( scaleFactor, scaleFactor, scaleFactor ) ) );
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+
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+ var originalGeometry = geometry.clone();
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+ originalGeometry.computeFaceNormals();
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+ originalGeometry.computeVertexNormals( true );
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+
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+ // in case of duplicated vertices
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+ geometry.mergeVertices();
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+ geometry.computeCentroids();
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+ geometry.computeFaceNormals();
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+ geometry.computeVertexNormals( true );
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+
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+ updateInfo();
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+
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+ var faceABCD = "abcd";
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+ var color, f, p, n, vertexIndex;
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+
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+ for ( i = 0; i < geometry.faces.length; i ++ ) {
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+
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+ f = geometry.faces[ i ];
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+
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+
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+ n = ( f instanceof THREE.Face3 ) ? 3 : 4;
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+
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+ for( var j = 0; j < n; j++ ) {
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+
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+ vertexIndex = f[ faceABCD.charAt( j ) ];
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+
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+ p = geometry.vertices[ vertexIndex ];
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+
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+ color = new THREE.Color( 0xffffff );
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+ color.setHSV( ( p.y ) / 400 + 0.5, 1.0, 1.0 );
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+
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+ f.vertexColors[ j ] = color;
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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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+ group = new THREE.Object3D();
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+ var mesh = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: 0xfefefe, wireframe: true, opacity: 0.5 } ) );
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+ group.add( mesh );
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+ scene.add( group );
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+
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+ var fvNames = [ 'a', 'b', 'c', 'd' ];
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+
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+ var normalLength = 15;
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+
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+
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+ for( var f = 0, fl = geometry.faces.length; f < fl; f ++ ) {
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+ var face = geometry.faces[ f ];
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+ var arrow = new THREE.ArrowHelper(
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+ face.normal,
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+ face.centroid,
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+ normalLength,
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+ 0x3333FF );
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+ mesh.add( arrow );
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+ }
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+
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+ for( var f = 0, fl = originalGeometry.faces.length; f < fl; f ++ ) {
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+ var face = originalGeometry.faces[ f ];
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+ if( face.vertexNormals === undefined ) {
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+ continue;
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+ }
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+ for( var v = 0, vl = face.vertexNormals.length; v < vl; v ++ ) {
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+ var arrow = new THREE.ArrowHelper(
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+ face.vertexNormals[ v ],
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+ originalGeometry.vertices[ face[ fvNames[ v ] ] ],
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+ normalLength,
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+ 0xFF3333 );
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+ mesh.add( arrow );
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+ }
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+ }
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+
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+ for( var f = 0, fl = mesh.geometry.faces.length; f < fl; f ++ ) {
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+ var face = mesh.geometry.faces[ f ];
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+ if( face.vertexNormals === undefined ) {
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+ continue;
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+ }
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+ for( var v = 0, vl = face.vertexNormals.length; v < vl; v ++ ) {
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+ var arrow = new THREE.ArrowHelper(
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+ face.vertexNormals[ v ],
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+ mesh.geometry.vertices[ face[ fvNames[ v ] ] ],
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+ normalLength,
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+ 0x000000 );
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+ mesh.add( arrow );
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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 init() {
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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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+ info = document.createElement( 'div' );
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+ info.style.position = 'absolute';
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+ info.style.top = '10px';
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+ info.style.width = '100%';
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+ info.style.textAlign = 'center';
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+ info.innerHTML = 'Drag to spin the geometry ';
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+ container.appendChild( info );
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+
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+ camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
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+ camera.position.z = 500;
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+
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+ scene = new THREE.Scene();
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+
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+ var light = new THREE.PointLight( 0xffffff, 1.5 );
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+ light.position.set( 1000, 1000, 2000 );
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+ scene.add( light );
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+
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+ addStuff();
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true } ); // WebGLRenderer CanvasRenderer
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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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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.top = '0px';
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+ container.appendChild( stats.domElement );
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+
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+ document.addEventListener( 'mousedown', onDocumentMouseDown, 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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+ //
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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 onDocumentMouseDown( event ) {
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+
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+ //event.preventDefault();
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+
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+ document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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+ document.addEventListener( 'mouseup', onDocumentMouseUp, false );
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+ document.addEventListener( 'mouseout', onDocumentMouseOut, false );
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+
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+ mouseXOnMouseDown = event.clientX - windowHalfX;
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+ mouseYOnMouseDown = event.clientY - windowHalfY;
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+ targetYRotationOnMouseDown = targetYRotation;
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+ targetXRotationOnMouseDown = targetXRotation;
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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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+ targetYRotation = targetYRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
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+ targetXRotation = targetXRotationOnMouseDown + ( mouseY - mouseYOnMouseDown ) * 0.02;
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+
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+ }
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+
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+ function onDocumentMouseUp( event ) {
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+
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+ document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
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+ document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
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+ document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
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+ }
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+
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+ function onDocumentMouseOut( event ) {
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+
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+ document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
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+ document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
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+ document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
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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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+ mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
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+ targetRotationOnMouseDown = targetRotation;
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+
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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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+ targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
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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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+
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+ render();
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+ stats.update();
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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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+ group.rotation.x = ( targetXRotation) * 0.15;
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+ group.rotation.y = ( targetYRotation ) * 0.15;
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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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+
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+ </body>
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+</html>
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+
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Ben Houston