Import_GDML_Export_ROOT.c

void Import_GDML_Export_ROOT()
{
    TString vmcDir = TString(gSystem->Getenv("VMCWORKDIR"));

    TGeoManager *gdml = new TGeoManager("gdml", "FAIRGeom");

    TGDMLParse parser;
    // Define your input GDML file HERE
    TGeoVolume* gdmlTop = parser.GDMLReadFile ("gadast.gdml");
    TGeoVolume* rootTop = new TGeoVolumeAssembly("TOP");

    gGeoManager->SetTopVolume(gdmlTop);

  
    // Define your position HERE
    TGeoRotation* rot = new TGeoRotation ("rot", 0., 0., 0.);
    TGeoCombiTrans* posrot = new TGeoCombiTrans (0., 0., 0., rot);

    rootTop->AddNode (gdmlTop, 1, posrot);

    gGeoManager->CloseGeometry();

    // Define you output ROOT file HERE
    TFile* outfile = new TFile(vmcDir + "/geometry/gadast.root", "RECREATE");
    rootTop->Write();
    outfile->Close();
  
}