IsoBeckmann.h

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#pragma once
 
#include "Core/SurfaceBehavior/Property/ShapeInvariantMicrofacet.h"
 
namespace ph
{
 
class IsoBeckmann : public ShapeInvariantMicrofacet
{
public:
    IsoBeckmann(
        real alpha,
        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_alpha;
};
 
inline std::array<real, 2> IsoBeckmann::getAlphas(const SurfaceHit& /* X */) const
{
    return {m_alpha, m_alpha};
}
 
}// end namespace ph