153 lines
3.7 KiB
JavaScript
153 lines
3.7 KiB
JavaScript
/**
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* @author mrdoob / http://mrdoob.com/
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* @author benaadams / https://twitter.com/ben_a_adams
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* @author Mugen87 / https://github.com/Mugen87
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*/
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import { Geometry } from '../core/Geometry.js';
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import { BufferGeometry } from '../core/BufferGeometry.js';
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import { Float32BufferAttribute } from '../core/BufferAttribute.js';
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import { Vector3 } from '../math/Vector3.js';
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// SphereGeometry
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function SphereGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) {
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Geometry.call( this );
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this.type = 'SphereGeometry';
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this.parameters = {
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radius: radius,
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widthSegments: widthSegments,
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heightSegments: heightSegments,
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phiStart: phiStart,
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phiLength: phiLength,
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thetaStart: thetaStart,
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thetaLength: thetaLength
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};
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this.fromBufferGeometry( new SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) );
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this.mergeVertices();
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}
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SphereGeometry.prototype = Object.create( Geometry.prototype );
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SphereGeometry.prototype.constructor = SphereGeometry;
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// SphereBufferGeometry
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function SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) {
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BufferGeometry.call( this );
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this.type = 'SphereBufferGeometry';
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this.parameters = {
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radius: radius,
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widthSegments: widthSegments,
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heightSegments: heightSegments,
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phiStart: phiStart,
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phiLength: phiLength,
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thetaStart: thetaStart,
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thetaLength: thetaLength
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};
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radius = radius || 1;
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widthSegments = Math.max( 3, Math.floor( widthSegments ) || 8 );
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heightSegments = Math.max( 2, Math.floor( heightSegments ) || 6 );
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phiStart = phiStart !== undefined ? phiStart : 0;
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phiLength = phiLength !== undefined ? phiLength : Math.PI * 2;
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thetaStart = thetaStart !== undefined ? thetaStart : 0;
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thetaLength = thetaLength !== undefined ? thetaLength : Math.PI;
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var thetaEnd = thetaStart + thetaLength;
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var ix, iy;
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var index = 0;
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var grid = [];
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var vertex = new Vector3();
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var normal = new Vector3();
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// buffers
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var indices = [];
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var vertices = [];
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var normals = [];
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var uvs = [];
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// generate vertices, normals and uvs
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for ( iy = 0; iy <= heightSegments; iy ++ ) {
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var verticesRow = [];
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var v = iy / heightSegments;
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for ( ix = 0; ix <= widthSegments; ix ++ ) {
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var u = ix / widthSegments;
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// vertex
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vertex.x = - radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
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vertex.y = radius * Math.cos( thetaStart + v * thetaLength );
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vertex.z = radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
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vertices.push( vertex.x, vertex.y, vertex.z );
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// normal
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normal.set( vertex.x, vertex.y, vertex.z ).normalize();
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normals.push( normal.x, normal.y, normal.z );
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// uv
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uvs.push( u, 1 - v );
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verticesRow.push( index ++ );
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}
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grid.push( verticesRow );
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}
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// indices
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for ( iy = 0; iy < heightSegments; iy ++ ) {
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for ( ix = 0; ix < widthSegments; ix ++ ) {
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var a = grid[ iy ][ ix + 1 ];
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var b = grid[ iy ][ ix ];
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var c = grid[ iy + 1 ][ ix ];
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var d = grid[ iy + 1 ][ ix + 1 ];
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if ( iy !== 0 || thetaStart > 0 ) indices.push( a, b, d );
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if ( iy !== heightSegments - 1 || thetaEnd < Math.PI ) indices.push( b, c, d );
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}
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}
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// build geometry
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this.setIndex( indices );
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this.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
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this.addAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
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this.addAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
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}
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SphereBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
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SphereBufferGeometry.prototype.constructor = SphereBufferGeometry;
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export { SphereGeometry, SphereBufferGeometry };
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