TrowbridgeReitz.h

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#pragma once
 
#include "Core/SurfaceBehavior/Property/ShapeInvariantMicrofacet.h"
 
namespace ph
{
 
class TrowbridgeReitz : public ShapeInvariantMicrofacet
{
public:
    explicit TrowbridgeReitz(
        EMaskingShadowing maskingShadowingType);
 
    std::array<real, 2> getAlphas(const SurfaceHit& X) const override = 0;
 
    real lambda(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const math::Vector3R& H,
        const math::Vector3R& unitDir,
        const std::array<real, 2>& alphas) const override = 0;
 
    real distribution(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const math::Vector3R& H) const override = 0;
 
    void sampleH(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const std::array<real, 2>& sample,
        math::Vector3R* out_H) const override = 0;
 
    void sampleVisibleH(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const math::Vector3R& V,
        const std::array<real, 2>& sample,
        math::Vector3R* out_H) const override;
 
    lta::PDF pdfSampleVisibleH(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const math::Vector3R& H,
        const math::Vector3R& V) const override;
 
private:
    math::Vector3R sampleVNDFDirOnHemisphereDupuy(
        const math::Vector3R& standardLocalV,
        const std::array<real, 2>& sample) const;
};
 
}// end namespace ph