// vis_helpers.h  (or paste into anasenMS.cpp)
#include <TEvePointSet.h>
#include <TFile.h>
#include <TTree.h>
#include <vector>
#include <mutex>

static TEvePointSet* gVisPts = nullptr;
static std::mutex gVisMutex;

// Call from your ROOT session after creating TEve objects:
void SetVisPointSet(TEvePointSet* pts){ gVisPts = pts; }

// Call this from your sim loop to update visualization and optionally write data:
void PushEventAndRecord(const std::vector<double>& x,
                        const std::vector<double>& y,
                        const std::vector<double>& z,
                        TTree* outTree = nullptr)
{
  if(outTree){
    outTree->SetBranchAddress("x",(void*)&x);
    outTree->SetBranchAddress("y",(void*)&y);
    outTree->SetBranchAddress("z",(void*)&z);
    outTree->Fill();
    outTree->GetCurrentFile()->Flush();
  }

  if(!gVisPts) return;
  std::lock_guard<std::mutex> lk(gVisMutex);
  gVisPts->Reset();
  for(size_t i=0;i<x.size(); ++i) gVisPts->SetNextPoint(x[i], y[i], z[i]);
  gEve->Redraw3D();
  gSystem->ProcessEvents();
}