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The LCDD geometry needs to be dumped to plain GDML to be loaded by ROOT.

You can use Assuming that there is a file called test.gdml in the current directory, a script similar to the following to will load a plain GDML file into ROOT.

void gdmlTest()
{
    char* testfile="./test.gdml";
    gSystem->Load("libGeom");
    gSystem->Load("libGdml");
    TGeoManager::Import(testfile);
    TGeoManager::Import("test.gdml");
gGeoManager->GetTopVolume()->Draw("ogl");
}

This command should display the ROOT OpenGL viewer with the geometry from the test.gdml file.