[Closed] C++ Extruding Edges

Hi, I am trying to extrude edges using MNMesh. I have been through EditPoly sample and believe I have all the code I need, but its not doing anything … any idea why? Code is below:

MNMesh* mm = &pTri->GetMesh();
  	mm->ClearAllFlags();
  	mm->CollapseDeadStructs();
  	for(int i = 0; i < mm->nume; i++) {mm->SetEdgeSel(i, TRUE);}
  	MNTempData *TempData = new MNTempData(mm);
  	MNChamferData *pChamData = TempData->ChamferData();
  
  	float height = 1.0f;
  	float width = 0.0f;
  	Tab<Point3> tUpDir;
  	int i;
  	
  	mm->ExtrudeEdges(MN_SEL, pChamData, tUpDir);
  
  	// Move the points up:
  	for (i=0; i<tUpDir.Count(); i++){ mm->v[i].p += tUpDir[i]*height;}