RTFunctions.h

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#ifndef _RTFunctions_
#define _RTFunctions_

namespace utl {
  class Point;
  class RandomEngine;
}

#include <utl/Photon.h>
#include <utl/Vector.h>

#include <vector>
#include <utility>

namespace TelescopeSimulatorKG {

  namespace RTFunctions {
    
    int Reflection (const utl::Photon& photonIn, const utl::Vector& normal, utl::Photon& photonOut);
    
    typedef std::vector<utl::Photon> PhotonList;
    int Refraction(const double n12, const utl::Photon& photonIn, const utl::Vector& normal, PhotonList& photonsOut);
    
    double Plane (const utl::Point& point, const utl::Vector& normal,
                  const utl::Photon& phtotnIn, utl::Photon& phtotnOut);
    
    typedef std::pair<utl::Photon, utl::Vector> PhotonNormalPair;
    typedef std::vector<PhotonNormalPair> IntersectionList;
    int Sphere (const utl::Point& origin, const double radius,
                const utl::Photon& photonIn, 
                IntersectionList& intersections);
    
    utl::Vector RandomNormal (utl::RandomEngine& rndm, const utl::Vector& normalIn, double sigma_alpha,
                              const utl::Vector& rayIn);
    
  }
  
}

#endif