UI();
				gui.add( params, 'asset', assets ).onChange( function ( value ) {

					loadAsset( value );

				} );

			}

			function loadAsset( asset ) {

				loader.load( 'models/3mf/' + asset + '.3mf', function ( group ) {

					if ( object ) {

						object.traverse( function ( child ) {

							if ( child.material ) child.material.dispose();
							if ( child.material && child.material.map ) child.material.map.dispose();
							if ( child.geometry ) child.geometry.dispose();

						} );

						scene.remov