refraction.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_PHYSICS_LIGHT_REFRACTION_HPP
#define ANTKEEPER_PHYSICS_LIGHT_REFRACTION_HPP
 
namespace physics {
namespace light {
 
namespace ior {
 
template <class T>
T cauchy(T lambda, T a, T b)
{
    return a + b / (lambda * lambda);
}
 
template <class T>
T cauchy(T lambda, T a, T b, T c)
{
    const T lambda2 = lambda * lambda;
    return a + b / lambda2 + c / (lambda2 * lambda2);
}
 
template <class T>
T sellmeier(T lambda, T b1, T c1, T b2, T c2)
{
    const T lambda2 = lambda * lambda;
 
    const T t1 = (b1 * lambda2) / (lambda2 - c1);
    const T t2 = (b2 * lambda2) / (lambda2 - c2);
    
    return std::sqrt(T(1) + t1 + t2);
}
 
template <class T>
T sellmeier(T lambda, T b1, T c1, T b2, T c2, T b3, T c3)
{
    const T lambda2 = lambda * lambda;
 
    const T t1 = (b1 * lambda2) / (lambda2 - c1);
    const T t2 = (b2 * lambda2) / (lambda2 - c2);
    const T t3 = (b3 * lambda2) / (lambda2 - c3);
    
    return std::sqrt(T(1) + t1 + t2 + t3);
}
 
} // namespace ior
 
} // namespace light
} // namespace physics
 
#endif // ANTKEEPER_PHYSICS_LIGHT_REFRACTION_HPP