TDisk.h

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#pragma once
 
#include "Math/TVector2.h"
#include "Math/TVector3.h"
#include "Math/constant.h"
 
#include <Common/assertion.h>
 
#include <cmath>
#include <array>
 
namespace ph::math
{
 
template<typename T>
class TDisk final
{
public:
    static TDisk makeUnit();
 
    TDisk() = default;
    explicit TDisk(T radius);
 
    T getArea() const;
 
    TVector3<T> sampleToSurface(const std::array<T, 2>& sample) const;
    TVector3<T> sampleToSurface(const std::array<T, 2>& sample, T* out_pdfA) const;
 
    TVector2<T> sampleToSurface2D(const std::array<T, 2>& sample) const;
    TVector2<T> sampleToSurface2D(const std::array<T, 2>& sample, T* out_pdfA) const;
 
    TVector3<T> sampleToSurfaceOriented(
        const std::array<T, 2>& sample, 
        const TVector3<T>&      normal = TVector3<T>(0, 1, 0),
        const TVector3<T>&      offset = TVector3<T>(0)) const;
 
    TVector3<T> sampleToSurfaceOriented(
        const std::array<T, 2>& sample, 
        T*                      out_pdfA,
        const TVector3<T>&      normal = TVector3<T>(0, 1, 0),
        const TVector3<T>&      offset = TVector3<T>(0)) const;
 
private:
    T m_radius;
 
    T uniformSamplePdfA() const;
};
 
}// end namespace ph::math
 
#include "Math/Geometry/TDisk.ipp"