Detailed description

Implements the GGX bsdf with the V-cavities shadow-masking model, using the importance sampling scheme described in Algorithm 3 of:

https://hal.inria.fr/hal-00996995v1/document

#include <ggx.h>

Public Methods
CUGAR_FORCEINLINE CUGAR_HOST_DEVICE	GGXBsdf (const float _roughness)

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE Vector3f	f (const DifferentialGeometry &geometry, const Vector3f V, const Vector3f L) const

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE Vector3f	f_over_p (const DifferentialGeometry &geometry, const Vector3f V, const Vector3f L) const

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE void	f_and_p (const DifferentialGeometry &geometry, const Vector3f V, const Vector3f L, Vector3f &f, float &p, const SphericalMeasure measure=kProjectedSolidAngle) const

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE float	p (const DifferentialGeometry &geometry, const Vector3f V, const Vector3f L, const SphericalMeasure measure=kProjectedSolidAngle) const

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE void	sample (const Vector3f u, const DifferentialGeometry &geometry, const Vector3f V, Vector3f &L, Vector3f &g, float &p, float &p_proj) const

template<typename RandomGeneratorT >
CUGAR_FORCEINLINE CUGAR_HOST_DEVICE bool	invert (const DifferentialGeometry &geometry, const Vector3f V, const Vector3f L, RandomGeneratorT &random, Vector3f &z, float &p, float &p_proj) const

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE void	inverse_pdf (const DifferentialGeometry &geometry, const Vector3f V, const Vector3f L, const Vector3f u, float &p, float &p_proj) const

Public Members
float	roughness

float	inv_roughness

Member Function Documentation

◆ f()

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE Vector3f cugar::GGXBsdf::f	(	const DifferentialGeometry &	geometry,
		const Vector3f	V,
		const Vector3f	L
	)		const

inline

evaluate the BRDF f(V,L)

NoH

◆ f_and_p()

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE void cugar::GGXBsdf::f_and_p	(	const DifferentialGeometry &	geometry,
		const Vector3f	V,
		const Vector3f	L,
		Vector3f &	f,
		float &	p,
		const SphericalMeasure	measure = `kProjectedSolidAngle`
	)		const

inline

evaluate the BRDF and the pdf in a single call

NoH

◆ f_over_p()

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE Vector3f cugar::GGXBsdf::f_over_p	(	const DifferentialGeometry &	geometry,
		const Vector3f	V,
		const Vector3f	L
	)		const

inline

evaluate the BRDF/pdf ratio f(V,L)/p(V,L) wrt projected solid angle

◆ inverse_pdf()

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE void cugar::GGXBsdf::inverse_pdf	(	const DifferentialGeometry &	geometry,
		const Vector3f	V,
		const Vector3f	L,
		const Vector3f	u,
		float &	p,
		float &	p_proj
	)		const

inline

given V and L and u, compute the probability of sampling u by inversion of V and L

◆ invert()

template<typename RandomGeneratorT >

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE bool cugar::GGXBsdf::invert	(	const DifferentialGeometry &	geometry,
		const Vector3f	V,
		const Vector3f	L,
		RandomGeneratorT &	random,
		Vector3f &	z,
		float &	p,
		float &	p_proj
	)		const

inline

given V and L, invert the sampling functions used to generate L from V

◆ p()

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE float cugar::GGXBsdf::p	(	const DifferentialGeometry &	geometry,
		const Vector3f	V,
		const Vector3f	L,
		const SphericalMeasure	measure = `kProjectedSolidAngle`
	)		const

inline

evaluate the pdf of sampling L given V, p(L|V) = p(V,L)

NoH

◆ sample()

CUGAR_FORCEINLINE CUGAR_HOST_DEVICE void cugar::GGXBsdf::sample	(	const Vector3f	u,
		const DifferentialGeometry &	geometry,
		const Vector3f	V,
		Vector3f &	L,
		Vector3f &	g,
		float &	p,
		float &	p_proj
	)		const

inline

sample L given V and return both the pdf p and the value g = f/p

NoH

The documentation for this struct was generated from the following file:

C:/p4research/research/jpantaleoni/Fermat-Public/contrib/cugar/bsdf/ggx.h

Detailed description

Public Methods

Public Members

Member Function Documentation

◆ f()

◆ f_and_p()

◆ f_over_p()

◆ inverse_pdf()

◆ invert()

◆ p()

◆ sample()