Increasing tower index in phi should correspond to increasing phi angle value, this...

diff --git a/EMCAL/AliEMCALGeoUtils.cxx b/EMCAL/AliEMCALGeoUtils.cxx
index 5afe9e801cd5a96389a1464fce79ffaed5f6c7ee..bb2fd43a21f0ad0f82f8211980729d84df4ba3ec 100644 (file)
--- a/EMCAL/AliEMCALGeoUtils.cxx
+++ b/EMCAL/AliEMCALGeoUtils.cxx
@@ -600,12 +600,19 @@ Bool_t AliEMCALGeoUtils::RelPosCellInSModule(Int_t absId, Double_t &xr, Double_t
   GetCellPhiEtaIndexInSModule(nSupMod,nModule,nIphi,nIeta, iphi, ieta); 
  
   xr = fCentersOfCellsXDir.At(ieta);
-  zr = fCentersOfCellsEtaDir.At(ieta);
-
-  if(nSupMod<10) {
-    yr = fCentersOfCellsPhiDir.At(iphi);
+  zr = fCentersOfCellsEtaDir.At(ieta); 
+       
+  Int_t iphi2 = iphi;
+       
+  if(nSupMod<10) { 
+               if(nSupMod%2 != 0) 
+                       iphi2 = (fCentersOfCellsPhiDir.GetSize()-1)-iphi;// 23-iphi, revert the ordering on C side in order to keep convention.
+               yr = fCentersOfCellsPhiDir.At(iphi2);
+         
   } else {
-    yr = fCentersOfCellsPhiDir.At(iphi + kphiIndexShift);
+               if(nSupMod%2 != 0) 
+                       iphi2 = (fCentersOfCellsPhiDir.GetSize()/2-1)-iphi;// 11-iphi, revert the ordering on C side in order to keep convention.
+               yr = fCentersOfCellsPhiDir.At(iphi2 + kphiIndexShift);
   }
   AliDebug(1,Form("absId %i nSupMod %i iphi %i ieta %i xr %f yr %f zr %f ",absId,nSupMod,iphi,ieta,xr,yr,zr));