THREE.WireframeGeometry2 = function ( geometry ) { THREE.LineSegmentsGeometry.call( this ); this.type = 'WireframeGeometry2'; this.fromWireframeGeometry( new THREE.WireframeGeometry( geometry ) ); // set colors, maybe }; THREE.WireframeGeometry2.prototype = Object.assign( Object.create( THREE.LineSegmentsGeometry.prototype ), { constructor: THREE.WireframeGeometry2, isWireframeGeometry2: true } );