+ TGeoTranslation center("center",-ROCcenter[0],-ROCcenter[1],-ROCcenter[2]);
+ fGlobalMatrix[isec]->Multiply(¢er);
+ //
+ // cluster correction matrix
+ //
+ fClusterMatrix[isec] = new TGeoHMatrix;
+ Double_t sectorAngle = 20.*(isec%18)+10;
+ TGeoHMatrix rotMatrix;
+ rotMatrix.RotateZ(sectorAngle);
+ if (GetGlobalMatrix(isec)->GetTranslation()[2]>0){
+ //
+ // mirrored system
+ //
+ TGeoRotation mirrorZ;
+ mirrorZ.SetAngles(90,0,90,90,180,0);
+ fClusterMatrix[isec]->Multiply(&mirrorZ);
+ }
+ TGeoTranslation trans(0,0,GetZLength());
+ fClusterMatrix[isec]->MultiplyLeft(&trans);
+ fClusterMatrix[isec]->MultiplyLeft((GetGlobalMatrix(isec)));
+ fClusterMatrix[isec]->MultiplyLeft(&(rotMatrix.Inverse()));