void ConvertGDMLtoRoot() {

  const TString _volumename = "mainframe_02";
  const TString _file = _volumename + ".gdml";
  const TString _file_out = _volumename + "_test.root";

  TGeoVolume *_vol_assembly = new TGeoVolumeAssembly(_volumename);

  TGDMLParse parser;
  TGeoVolume *_gdml_vol = parser.GDMLReadFile(_file);
  TObjArray *_node = _gdml_vol->GetNodes();

  Int_t copy_number = 0;
  for (int iNode = 0; iNode < _node->GetEntriesFast(); iNode++) {
    TGeoNode *_fNode = (TGeoNode *)_node->At(iNode);

    TGeoVolume *_fVol = (TGeoVolume *)_fNode->GetVolume();

    /*  if(TString(_fVol->GetName()).Contains("DIN"))continue;
      if(TString(_fVol->GetName()).Contains("Ankertraeger"))continue;
      if(TString(_fVol->GetName()).Contains("Montageschiene_A3"))continue;
      if(TString(_fVol->GetName()).Contains("V-Spring"))continue;*/

    // Removing volume from support center
    /* if(TString(_fVol->GetName()).Contains("V-Ankertraeger"))continue;
     if(TString(_fVol->GetName()).Contains("Montageschiene_A3"))continue;
     if(TString(_fVol->GetName()).Contains("DIN"))continue;
     if(TString(_fVol->GetName()).Contains("V-Spring"))continue;*/
    //  if(TString(_fVol->GetName()).Contains("V-KANYA"))continue;

    // secondary frame //
    /* if(TString(_fVol->GetName()).Contains("Sekundaer-Rahmen-Abstandsblech-34"))continue;
     if(TString(_fVol->GetName()).Contains("Sekundaer-Rahmen-Abstandsblech-31"))continue;
     if(TString(_fVol->GetName()).Contains("V-Dummy_rollenfuehrung_top"))continue;*/

    _vol_assembly->AddNode(_fVol, copy_number, 0);
    copy_number++;
  }
  _gdml_vol->Draw("ogl");
  // _gdml_vol->CheckOverlaps(0.001,"s10000");
  // _gdml_vol->PrintOverlaps();

  _vol_assembly->Export(_file_out);
}