ThinDielectricShell.h

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#pragma once
 
#include "Core/SurfaceBehavior/SurfaceOptics.h"
#include "Core/SurfaceBehavior/Property/DielectricFresnel.h"
#include "Core/Texture/TTexture.h"
#include "Math/Color/Spectrum.h"
 
#include <Common/primitive_type.h>
 
#include <memory>
 
namespace ph
{
 
class ThinDielectricShell : public SurfaceOptics
{
public:
    explicit ThinDielectricShell(std::shared_ptr<DielectricFresnel> fresnel);
 
    ThinDielectricShell(
        std::shared_ptr<DielectricFresnel>        fresnel,
        std::shared_ptr<TTexture<real>>           thickness,
        std::shared_ptr<TTexture<math::Spectrum>> sigmaT);
 
    ThinDielectricShell(
        std::shared_ptr<DielectricFresnel>        fresnel,
        std::shared_ptr<TTexture<math::Spectrum>> reflectionScale,
        std::shared_ptr<TTexture<math::Spectrum>> transmissionScale);
 
    ThinDielectricShell(
        std::shared_ptr<DielectricFresnel>        fresnel,
        std::shared_ptr<TTexture<real>>           thickness,
        std::shared_ptr<TTexture<math::Spectrum>> sigmaT,
        std::shared_ptr<TTexture<math::Spectrum>> reflectionScale,
        std::shared_ptr<TTexture<math::Spectrum>> transmissionScale);
 
    ESurfacePhenomenon getPhenomenonOf(SurfaceElemental elemental) const override;
 
private:
    void calcBsdf(
        const BsdfQueryContext& ctx,
        const BsdfEvalInput&    in,
        BsdfEvalOutput&         out) const override;
 
    void genBsdfSample(
        const BsdfQueryContext& ctx,
        const BsdfSampleInput&  in,
        SampleFlow&             sampleFlow,
        BsdfSampleOutput&       out) const override;
 
    void calcBsdfPdf(
        const BsdfQueryContext& ctx,
        const BsdfPdfInput&     in,
        BsdfPdfOutput&          out) const override;
 
private:
    constexpr static SurfaceElemental REFLECTION   = 0;
    constexpr static SurfaceElemental TRANSMISSION = 1;
 
    std::shared_ptr<DielectricFresnel>        m_fresnel;
    std::shared_ptr<TTexture<real>>           m_thickness;
    std::shared_ptr<TTexture<math::Spectrum>> m_sigmaT;
    std::shared_ptr<TTexture<math::Spectrum>> m_reflectionScale;
    std::shared_ptr<TTexture<math::Spectrum>> m_transmissionScale;
};
 
}// end namespace ph