MultipleScatteringCorrectionDistGraber.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2021 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
#include "MantidAlgorithms/DllConfig.h"
#include "MantidGeometry/IDTypes.h"
#include "MantidGeometry/Objects/IObject.h"
 
namespace Mantid {
 
namespace Geometry {
class IDetector;
class IObject;
} // namespace Geometry
 
namespace Algorithms {
 
class MANTID_ALGORITHMS_DLL MultipleScatteringCorrectionDistGraber {
public:
  MultipleScatteringCorrectionDistGraber(const Geometry::IObject &sampleShape, const double elementSize);
  ~MultipleScatteringCorrectionDistGraber() = default;
  // Pre-calculate (cache) all the distances from source to each individual voxel
  // inside the sample.
  // This function is borrowed from AnyShapeAbsorption.initialiseCachedDistances()
  void cacheLS1(const Mantid::Kernel::V3D &beamDirection);
 
  // cached LS1 related data for multiple scattering correction
  std::vector<double> m_LS1;                   
  std::vector<double> m_elementVolumes;        
  std::vector<Kernel::V3D> m_elementPositions; 
  size_t m_numVolumeElements;                  
  double m_totalVolume;                        
 
private:
  const Geometry::IObject *m_sampleShape; 
  const double m_elementSize;             
};
 
} // namespace Algorithms
} // namespace Mantid