mirror of
https://github.com/wahyd4/three.js.git
synced 2026-08-19 18:05:57 +10:00
128 lines
3.0 KiB
JavaScript
128 lines
3.0 KiB
JavaScript
/**
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* @author mr.doob / http://mrdoob.com/
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* based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Sphere.as
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*/
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var Sphere = function ( radius, segments_width, segments_height, smooth ) {
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THREE.Geometry.call( this );
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var gridX = segments_width || 8,
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gridY = segments_height || 6;
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var i, j;
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var iHor = Math.max( 3, gridX );
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var iVer = Math.max( 2, gridY );
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var aVtc = [];
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for ( j = 0; j < ( iVer + 1 ) ; j++ ) {
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var fRad1 = j / iVer;
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var fZ = radius * Math.cos( fRad1 * Math.PI );
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var fRds = radius * Math.sin( fRad1 * Math.PI );
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var aRow = [];
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var oVtx = 0;
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for ( i = 0; i < iHor; i++ ) {
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var fRad2 = 2 * i / iHor;
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var fX = fRds * Math.sin( fRad2 * Math.PI );
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var fY = fRds * Math.cos( fRad2 * Math.PI );
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if ( !( ( j == 0 || j == iVer ) && i > 0 ) ) {
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oVtx = this.vertices.push( new THREE.Vertex( new THREE.Vector3( fY, fZ, fX ) ) ) - 1;
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}
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aRow.push( oVtx );
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}
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aVtc.push( aRow );
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}
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var n1, n2, n3, iVerNum = aVtc.length;
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for ( j = 0; j < iVerNum; j++ ) {
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var iHorNum = aVtc[ j ].length;
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if ( j > 0 ) {
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for ( i = 0; i < iHorNum; i++ ) {
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var bEnd = i == ( iHorNum - 1 );
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var aP1 = aVtc[ j ][ bEnd ? 0 : i + 1 ];
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var aP2 = aVtc[ j ][ ( bEnd ? iHorNum - 1 : i ) ];
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var aP3 = aVtc[ j - 1 ][ ( bEnd ? iHorNum - 1 : i ) ];
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var aP4 = aVtc[ j - 1 ][ bEnd ? 0 : i + 1 ];
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var fJ0 = j / ( iVerNum - 1 );
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var fJ1 = ( j - 1 ) / ( iVerNum - 1 );
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var fI0 = ( i + 1 ) / iHorNum;
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var fI1 = i / iHorNum;
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var aP1uv = new THREE.UV( 1 - fI0, fJ0 );
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var aP2uv = new THREE.UV( 1 - fI1, fJ0 );
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var aP3uv = new THREE.UV( 1 - fI1, fJ1 );
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var aP4uv = new THREE.UV( 1 - fI0, fJ1 );
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if ( j < ( aVtc.length - 1 ) ) {
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n1 = this.vertices[ aP1 ].position.clone();
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n2 = this.vertices[ aP2 ].position.clone();
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n3 = this.vertices[ aP3 ].position.clone();
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n1.normalize();
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n2.normalize();
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n3.normalize();
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if ( smooth ) {
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this.faces.push( new THREE.Face3( aP1, aP2, aP3, [ new THREE.Vector3( n1.x, n1.y, n1.z ), new THREE.Vector3( n2.x, n2.y, n2.z ), new THREE.Vector3( n3.x, n3.y, n3.z ) ] ) );
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} else {
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this.faces.push( new THREE.Face3( aP1, aP2, aP3 ) );
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}
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this.uvs.push( [ aP1uv, aP2uv, aP3uv ] );
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}
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if ( j > 1 ) {
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n1 = this.vertices[aP1].position.clone();
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n2 = this.vertices[aP3].position.clone();
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n3 = this.vertices[aP4].position.clone();
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n1.normalize();
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n2.normalize();
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n3.normalize();
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if ( smooth ) {
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this.faces.push( new THREE.Face3( aP1, aP3, aP4, [ new THREE.Vector3( n1.x, n1.y, n1.z ), new THREE.Vector3( n2.x, n2.y, n2.z ), new THREE.Vector3( n3.x, n3.y, n3.z ) ] ) );
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} else {
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this.faces.push( new THREE.Face3( aP1, aP3, aP4 ) );
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}
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this.uvs.push( [ aP1uv, aP3uv, aP4uv ] );
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}
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}
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}
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}
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this.computeCentroids();
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this.computeNormals();
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}
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Sphere.prototype = new THREE.Geometry();
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Sphere.prototype.constructor = Sphere;
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