create a geometry suitable for a THREE.Line of type THREE.LineStrip from a sphere (not displaying triangle-edges of a sphere wireframe)

main.js

/**
 * create a geometry suitable for a THREE.Line of type THREE.LineStrip from a sphere
 *  thereby not displaying triangle-edges of a sphere wireframe.
 * @param {THREE.SphereGeometry} geoSphere
 * @returns {THREE.Geometry}
 */
function lineStripGeometryFromSphereGeometry(geoSphere) {
	var geoLine = new THREE.Geometry(),
		w = geoSphere.widthSegments, h = geoSphere.heightSegments,
		x, y;
	// add rings (lineStrip adds zero meridian, which is why this only works for phi,theta 0-2PI)
	for (y = 0; y <= h; y++)
		for (x = 0; x <= w; x++)
			geoLine.vertices.push(geoSphere.vertices[y * (w + 1) + x].clone());
	// add meridians
	for (x = 1; x <= w; x++) {
		var yFrom = (x % 2) ? h : 0;
		var yTo = h - yFrom;
		var yStep = (x % 2) ? -1 : +1;
		for (y = yFrom; y != yTo; y += yStep)
			geoLine.vertices.push(geoSphere.vertices[y * (w + 1) + x].clone());
	}
	return geoLine;
}