#include "TFile.h"
#include "TTree.h"
#include <vector>
#include "DDRec/Vector3D.h"
using dd4hep::rec::Vector3D;
using namespace std;

int main(){
    TFile* f = new TFile("test.root", "RECREATE");
    TTree* t = new TTree("Test", "Test Tree");
    std::vector <dd4hep::rec::Vector3D> xyz;
    t->Branch("xyz", &xyz);
    xyz.push_back(Vector3D(42., 42.*42., 42.*42.+42.));
    t->Fill();
    f->Write();

    return 0;
}