G4OCCT_STEPAssembly_impl.cc

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// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2026 G4OCCT Contributors
 
 
#include "G4OCCT_STEPAssembly_impl.hh"
 
#include "G4OCCT/G4OCCTAssemblyRegistry.hh"
#include "G4OCCT/G4OCCTAssemblyVolume.hh"
#include "G4OCCT/G4OCCTMaterialMap.hh"
 
#include <map>
#include <memory>
#include <stdexcept>
#include <string>
#include <vector>
 
class G4Material;
 
int G4OCCT_ImportSTEPAssembly(const std::string& path,
                              const std::map<std::string, G4Material*>& materials,
                              const std::string& detectorName,
                              const std::vector<std::string>& /*sensitiveNames*/) {
  G4OCCTMaterialMap matMap;
  for (const auto& [stepName, g4mat] : materials) {
    matMap.Add(stepName, g4mat);
  }
 
  std::unique_ptr<G4OCCTAssemblyVolume> assembly;
  try {
    assembly.reset(G4OCCTAssemblyVolume::FromSTEP(path, matMap));
  } catch (const std::exception& ex) {
    throw std::runtime_error("G4OCCT_STEPAssembly: failed to import '" + path + "' (" + ex.what() +
                             ")");
  }
 
  const int nConstituents = static_cast<int>(assembly->GetLogicalVolumes().size());
  G4OCCTAssemblyRegistry::Instance().Register(detectorName, assembly.get());
  assembly.release(); // registry takes ownership
  return nConstituents;
}