<!-- AVATAR-FORGE · part 212 -->
at32BufferAttribute( uvs, 2 ) );


		// helper functions

		function addShape( shape ) {

			const indexOffset = vertices.length / 3;
			const points = shape.extractPoints( curveSegments );

			let shapeVertices = points.shape;
			const shapeHoles = points.holes;

			// check direction of vertices

			if ( ShapeUtils.isClockWise( shapeVertices ) === false ) {

				shapeVertices = shapeVertices.reverse();

			}

			for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {

				const shapeHole = shapeHoles[ i ];

				if ( ShapeUtils.isClockWise( shapeHole ) === true ) {

					shapeHoles[ i ] = shapeHole.reverse();

				}

			}

			const faces = ShapeUtils.triangulateShape( shapeVertices, shapeHoles );

			// join vertices of inner and outer paths to a single array

			for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {

				const shapeHole = shapeHoles[ i ];
				shapeVertices = shapeVertices.concat( shapeHole );

			}

			// vertices, normals, uvs

			for ( let i = 0, l = shapeVertices.length; i < l; i ++ ) {

				const vertex = shapeVertices[ i ];

				vertices.push( vertex.x, vertex.y, 0 );
				normals.push( 0, 0, 1 );
				uvs.push( vertex.x, vertex.y ); // world uvs

			}

			// indices

			for ( let i = 0, l = faces.length; i < l; i ++ ) {

				const face = faces[ i ];

				const a = face[ 0 ] + indexOffset;
				const b = face[ 1 ] + indexOffset;
				const c = face[ 2 ] + indexOffset;

				indices.push( a, b, c );
				groupCount += 3;

			}

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		const shapes = this.parameters.shapes;

		return toJSON( shapes, data );

	}

	static fromJSON( data, shapes ) {

		const geometryShapes = [];

		for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {

			const shape = shapes[ data.shapes[ j ] ];

			geometryShapes.push( shape );

		}

		return new ShapeGeometry( geometryShapes, data.curveSegments );

	}

}

function toJSON( shapes, data ) {

	data.shapes = [];

	if ( Array.isArray( shapes ) ) {

		for ( let i = 0, l = shapes.length; i < l; i ++ ) {

			const shape = shapes[ i ];

			data.shapes.push( shape.uuid );

		}

	} else {

		data.shapes.push( shapes.uuid );

	}

	return data;

}

class SphereGeometry extends BufferGeometry {

	constructor( radius = 1, widthSegments = 32, heightSegments = 16, phiStart = 0, phiLength = Math.PI * 2, thetaStart = 0, thetaLength = Math.PI ) {

		super();

		this.type = 'SphereGeometry';

		this.parameters = {
			radius: radius,
			widthSegments: widthSegments,
			heightSegments: heightSegments,
			phiStart: phiStart,
			phiLength: phiLength,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		widthSegments = Math.max( 3, Math.floor( widthSegments ) );
		heightSegments = Math.max( 2, Math.floor( heightSegments ) );

		const thetaEnd = Math.min( thetaStart + thetaLength, Math.PI );

		let index = 0;
		const grid = [];

		const vertex = new Vector3();
		const normal = new Vector3();

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// generate vertices, normals and uvs

		for ( let iy = 0; iy <= heightSegments; iy ++ ) {

			const verticesRow = [];

			const v = iy / heightSegments;

			// special case for the poles

			let uOffset = 0;

			if ( iy === 0 && thetaStart === 0 ) {

				uOffset = 0.5 / widthSegments;

			} else if ( iy === heightSegments && thetaEnd === Math.PI ) {

				uOffset = - 0.5 / widthSegments;

			}

			for ( let ix = 0; ix <= widthSegments; ix ++ ) {

				const u = ix / widthSegments;

				// vertex

				vertex.x = - radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
				vertex.y = radius * Math.cos( thetaStart + v * thetaLength );
				vertex.z = radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );

				vertices.push( vertex.x, vertex.y, vertex.z );

				// normal

				normal.copy( vertex ).normalize();
				normals.push( normal.x, normal.y, normal.z );

				// uv

				uvs.push( u + uOffset, 1 - v );

				verticesRow.push( index ++ );

			}

			grid.push( verticesRow );

		}

		// indices

		for ( let iy = 0; iy < heightSegments; iy ++ ) {

			for ( let ix = 0; ix < widthSegments; ix ++ ) {

				const a = grid[ iy ][ ix + 1 ];
				const b = grid[ iy ][ ix ];
				const c = grid[ iy + 1 ][ ix ];
				const d = grid[ iy + 1 ][ ix + 1 ];

				if ( iy !== 0 || thetaStart > 0 ) indices.push( a, b, d );
				if ( iy !== heightSegments - 1 || thetaEnd < Math.PI ) indices.push( b, c, d );

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

	}

	copy( source ) {

		super.copy( source );

		thi