DielectricFresnel.h

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#pragma once
 
#include "Core/SurfaceBehavior/Property/FresnelEffect.h"
#include "Math/TVector3.h"
 
#include <optional>
 
namespace ph
{
 
class DielectricFresnel : public FresnelEffect
{
public:
    DielectricFresnel(real iorOuter, real iorInner);
 
    math::Spectrum calcReflectance(real cosThetaIncident) const override = 0;
 
    std::optional<math::Vector3R> calcRefractDir(
        const math::Vector3R& I,
        const math::Vector3R& N) const;
 
    std::optional<real> calcRefractCos(
        const math::Vector3R& I,
        const math::Vector3R& N) const;
 
    real getIorOuter() const;
    real getIorInner() const;
 
protected:
    real m_iorOuter;
    real m_iorInner;
};
 
inline real DielectricFresnel::getIorOuter() const
{
    return m_iorOuter;
}
 
inline real DielectricFresnel::getIorInner() const
{
    return m_iorInner;
}
 
}// end namespace ph