G4RayScanner.h

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// SPDX-FileCopyrightText: 2026 CERN for the benefit of the SHiP Collaboration
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include <G4Navigator.hh>
#include <G4ThreeVector.hh>
 
#include <vector>
 
class G4LogicalVolume;
class G4Material;
class G4VPhysicalVolume;
 
namespace ship {
 
struct RaySegment {
    const G4Material* material;  
    double length;               
};
 
struct RayScan {
    double entry{0.};                  
    std::vector<RaySegment> segments;  
};
 
class G4RayScanner {
   public:
    explicit G4RayScanner(G4LogicalVolume* top);
 
    ~G4RayScanner();
 
    G4RayScanner(const G4RayScanner&) = delete;
    G4RayScanner& operator=(const G4RayScanner&) = delete;
    G4RayScanner(G4RayScanner&&) = delete;
    G4RayScanner& operator=(G4RayScanner&&) = delete;
 
    [[nodiscard]] RayScan scan(const G4ThreeVector& origin, const G4ThreeVector& direction) const;
 
   private:
    G4VPhysicalVolume* m_world{nullptr};
    mutable G4Navigator m_navigator;
};
 
}  // namespace ship