Draw half cylinder, or two different textures for same cylinder

found a hackish solution by making this small change in ofMesh.cpp, function ofMesh ofMesh::cylinder( ... ) {

from

float angleIncRadius = -1 * ( TWO_PI/((float)radiusSegments-1.f));

to

float angleIncRadius = -1 * ( (TWO_PI/ divide ) /((float)radiusSegments-1.f));