lafortune< CONF, Symmetry, NAME > Class Template Reference

The Lafortune BRDF model. This implements the model in Eq. 4 in the original paper linked above: More...

#include <lafortune.h>

Public Member Functions
	BBM_IMPORT_CONFIG (CONF)
Spectrum	eval (const Vec3d &in, const Vec3d &out, BsdfFlag component=bsdf_flag::All, unit_t=unit_t::Radiance, Mask mask=true) const
	Evaluate the BSDF for a given in and out direction.
BsdfSample	sample (const Vec3d &out, const Vec2d &xi, BsdfFlag component=bsdf_flag::All, unit_t unit=unit_t::Radiance, Mask mask=true) const
	Sample the BSDF given a direction and two random variables.
Value	pdf (const Vec3d &in, const Vec3d &out, BsdfFlag component=bsdf_flag::All, unit_t=unit_t::Radiance, Mask mask=true) const
	Compute the pdf given an in and out direction.
Spectrum	reflectance (const Vec3d &out, BsdfFlag component=bsdf_flag::All, unit_t=unit_t::Radiance, Mask mask=true) const
	Return the (approximate) hemispherical reflectance of the BSDF.
	BBM_DEFAULT_CONSTRUCTOR (lafortune)
	Default constructor.

Public Attributes
	BBM_BSDF_FORWARD

Static Public Attributes
static constexpr string_literal	name = NAME
specular_scale< Spectrum >	albedo
	Class Attributes.
bsdf_parameter< symmetry_t< Symmetry, Value >, bsdf_attr::SpecularParameter, -0.57735026919, std::numeric_limits< Scalar >::max(), std::numeric_limits< Scalar >::min()>	Cxy
bsdf_parameter< Value, bsdf_attr::SpecularParameter, 0.57735026919, std::numeric_limits< Scalar >::max(), std::numeric_limits< Scalar >::min()>	Cz
specular_sharpness< Value >	sharpness
	BBM_ATTRIBUTES (albedo, Cxy, Cz, sharpness)

Detailed Description

template<typename CONF, symmetry_v Symmetry = symmetry_v::Anisotropic, string_literal NAME = "Lafortune">
requires concepts::config<CONF>
class bbm::lafortune< CONF, Symmetry, NAME >

The Lafortune BRDF model. This implements the model in Eq. 4 in the original paper linked above:

\( f_r(u, v) = \rho_s [ C_x u_x v_x + C_y u_y v_y + C_z u_z v_z ]^n \)

Template Parameters

CONF	= bbm configuration \tpatam Symmetry = isotropic or anisotropic (Default: symmetry_v::Anisotropic)
NAME	= name of the BSDF model (Default: 'Lafortune')

Implements: concepts::bsdfmodel

Member Function Documentation

BBM_ATTRIBUTES()

BBM_ATTRIBUTES	(	albedo	,
		Cxy	,
		Cz	,
		sharpness
	)

BBM_DEFAULT_CONSTRUCTOR()

BBM_DEFAULT_CONSTRUCTOR ( lafortune< CONF, Symmetry, NAME >  )

inline

Default constructor.

BBM_IMPORT_CONFIG()

BBM_IMPORT_CONFIG

(

CONF

)

eval()

Spectrum eval ( const Vec3d &  in, const Vec3d &  out, BsdfFlag  component = bsdf_flag::All, unit_t  = unit_t::Radiance, Mask  mask = true  ) const

inline

Evaluate the BSDF for a given in and out direction.

Parameters

in	= incident direction
out	= outgoing direction
component	= which reflectance component to eval
unit	= unit of computation (ignored)
mask	= masking of lanes (e.g., for Packet eval)

Returns

Evaluation of the BSDF per spectrum.

pdf()

Value pdf ( const Vec3d &  in, const Vec3d &  out, BsdfFlag  component = bsdf_flag::All, unit_t  = unit_t::Radiance, Mask  mask = true  ) const

inline

Compute the pdf given an in and out direction.

Parameters

in	= the incoming (sampled) direction
out	= the outgoing (given) direction
component	= which reflectance component was sampled
unit	= unit of computation (ignored)
mask	= masking of lanes

Returns

the PDF that the incoming direction would be sampled given the outgoing direction.

reflectance()

Spectrum reflectance ( const Vec3d &  out, BsdfFlag  component = bsdf_flag::All, unit_t  = unit_t::Radiance, Mask  mask = true  ) const

inline

Return the (approximate) hemispherical reflectance of the BSDF.

Parameters

out	= the outgoing direction
component	= which reflectance component to eval
unit	= unit of computation (ignored)
mask	= masking of lanes

Returns

the approximate hemispherical reflectance of the BSDF for a given direction

sample()

BsdfSample sample ( const Vec3d &  out, const Vec2d &  xi, BsdfFlag  component = bsdf_flag::All, unit_t  unit = unit_t::Radiance, Mask  mask = true  ) const

inline

Sample the BSDF given a direction and two random variables.

Parameters

out	= outgoing direction
xi	= two random variables stored in a Vec2d
component	= which reflectance component to sample
unit	= unit of computation (ignored)
mask	= masking of lanes.

Returns

A bsdfSample containing the sampled direction and the corresponding pdf.

Member Data Documentation

albedo

specular_scale<Spectrum> albedo

Class Attributes.

BBM_BSDF_FORWARD

BBM_BSDF_FORWARD

Cxy

bsdf_parameter<symmetry_t<Symmetry,Value>, bsdf_attr::SpecularParameter, -0.57735026919, std::numeric_limits<Scalar>::max(), std::numeric_limits<Scalar>::min()> Cxy

Cz

bsdf_parameter<Value, bsdf_attr::SpecularParameter, 0.57735026919, std::numeric_limits<Scalar>::max(), std::numeric_limits<Scalar>::min()> Cz

name

constexpr string_literal name = NAME

staticconstexpr

sharpness

specular_sharpness<Value> sharpness

---

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

• include/bsdfmodel/lafortune.h