d( data, 'phiLength', 0, twoPi ).onChange( generateGeometry );

					generateGeometry();

				},

				OctahedronGeometry: function ( mesh ) {

					const data = {
						radius: 10,
						detail: 0
					};

					function generateGeometry() {

						updateGroupGeometry( mesh,
							new OctahedronGeometry(
								data.radius, data.detail
							)
						);

					}

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

					folder.add( data, 'radius', 1, 20 ).onChange( generateGeometry );
					fold