gth: twoPi,
						thetaStart: 0,
						thetaLength: Math.PI
					};

					function generateGeometry() {

						updateGroupGeometry( mesh,
							new SphereGeometry(
								data.radius, data.widthSegments, data.heightSegments, data.phiStart, data.phiLength, data.thetaStart, data.thetaLength
							)
						);

					}

					const folder = gui.addFolder( 'THREE.SphereGeometry' );

					folder.add( data, 'radius', 1, 30 ).onChange( generateGeometry );
					folder.add( data, 'widthSegments', 3, 64 ).step( 1 ).on