microfacet< NDF, MaskingShadowing, Fresnel, NormalizationFactor, NAME > Struct Template Reference

General microfacet BRDF model. More...

#include <microfacet.h>

Inherited by lowmicrofacet< CONF, NormalizationFactor, NAME >.

Public Member Functions
	BBM_IMPORT_CONFIG (NDF)
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-out direction pair.
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 microfacet 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 (microfacet)
	Default constructor.

Public Attributes
	BBM_BSDF_FORWARD

Static Public Attributes
static constexpr string_literal	name = NAME

Class Attributes are copied from the NDF
NDF	ndf
fresnel_parameter< typename std::decay_t< Fresnel >::parameter_type >	eta
	BBM_ATTRIBUTES (reflection::attributes(ndf), eta)

Detailed Description

template<typename NDF, typename MaskingShadowing, typename Fresnel, auto NormalizationFactor = microfacet_n::Unnormalized, string_literal NAME = "microfacet">
requires concepts::matching_config<NDF, MaskingShadowing, Fresnel> && concepts::ndf<NDF> && concepts::maskingshadowing<MaskingShadowing> && std::default_initializable<NDF> && concepts::fresnel<Fresnel>
struct bbm::microfacet< NDF, MaskingShadowing, Fresnel, NormalizationFactor, NAME >

General microfacet BRDF model.

Template Parameters

NDF	= microfacet normal distribution (concepts::ndf && std::default_initializable)
MaskingShadowing	= masking and shadowing function (concepts::maskingshadowing)
Fresnel	= fresnel implementation (requires concepts::fresnel)
NormalizationFactor	= see microfacet_n
NAME	= model name

NDF, MaskingShadowing, and Fresnel must also meet config::matching_config

Implements: concepts::bsdfmodel

Member Function Documentation

BBM_ATTRIBUTES()

BBM_ATTRIBUTES	(	reflection::attributes(ndf)	,
		eta
	)

BBM_DEFAULT_CONSTRUCTOR()

BBM_DEFAULT_CONSTRUCTOR ( microfacet< NDF, MaskingShadowing, Fresnel, NormalizationFactor, NAME >  )

inline

Default constructor.

BBM_IMPORT_CONFIG()

BBM_IMPORT_CONFIG

(

NDF

)

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-out direction pair.

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 microfacet 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

BBM_BSDF_FORWARD

BBM_BSDF_FORWARD

eta

fresnel_parameter<typename std::decay_t<Fresnel>::parameter_type> eta

name

constexpr string_literal name = NAME

staticconstexpr

ndf

NDF ndf

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

• include/bsdfmodel/microfacet.h