AnisoTrowbridgeReitz.h

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#pragma once
 
#include "Core/SurfaceBehavior/Property/TrowbridgeReitz.h"
 
namespace ph
{
 
class AnisoTrowbridgeReitz : public TrowbridgeReitz
{
public:
    AnisoTrowbridgeReitz(
        real alphaU,
        real alphaV,
        EMaskingShadowing maskingShadowingType);
 
    std::array<real, 2> getAlphas(const SurfaceHit& X) const override;
 
    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;
 
    real distribution(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const math::Vector3R& H) const override;
 
    void sampleH(
        const SurfaceHit& X,
        const math::Vector3R& N,
        const std::array<real, 2>& sample,
        math::Vector3R* out_H) const override;
 
private:
    real m_alphaU;
    real m_alphaV;
    real m_rcpAlphaU2;
    real m_rcpAlphaV2;
};
 
inline std::array<real, 2> AnisoTrowbridgeReitz::getAlphas(const SurfaceHit& /* X */) const
{
    return {m_alphaU, m_alphaV};
}
 
}// end namespace ph