function AxisHelper( size ) {

		size = size || 1;

		var vertices = [
			0, 0, 0,  size, 0, 0,
			0, 0, 0,  0, size, 0,
			0, 0, 0,  0, 0, size
		];

		var colors = [
			1, 0, 0,  1, 0.6, 0,
			0, 1, 0,  0.6, 1, 0,
			0, 0, 1,  0, 0.6, 1
		];

		var geometry = new BufferGeometry();
		geometry.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.addAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		var material = new LineBasicMaterial( { vertexColors: VertexColors } );

		LineSegments.call( this, geometry, material );

	}
@author sroucheray / http://sroucheray.org/
@author mrdoob / http://mrdoob.com/