lambertian< CONF, NAME > Struct Template Reference

The classic diffuse Lambertian BSDF model. More...

#include <lambertian.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 diffuse 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 &, 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 (lambertian)
	Default constructor.

Public Attributes
	BBM_BSDF_FORWARD

Static Public Attributes
static constexpr string_literal	name = NAME

Class Attributes
diffuse_scale< Spectrum >	albedo
	BBM_ATTRIBUTES (albedo)

Detailed Description

template<typename CONF, string_literal NAME = "Lambertian">
requires concepts::config<CONF>
struct bbm::lambertian< CONF, NAME >

The classic diffuse Lambertian BSDF model.

Template Parameters

CONF	= type configuration to use.
NAME	= name of the BSDF model.

Implements: concepts::bsdfmodel

Member Function Documentation

BBM_ATTRIBUTES()

BBM_ATTRIBUTES

(

albedo

)

BBM_DEFAULT_CONSTRUCTOR()

BBM_DEFAULT_CONSTRUCTOR ( lambertian< CONF, 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.

Note: Evaluates the classic diffuse BSDF, i.e.. a constant independent of in and out directions above the horizon. No foreshortning is included.

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 &  , 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 diffuse 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.

Follows the convention of Veach; samples incoming directions proportional to the cosine weighted solid angle.

Member Data Documentation

albedo

diffuse_scale<Spectrum> albedo

BBM_BSDF_FORWARD

BBM_BSDF_FORWARD

name

constexpr string_literal name = NAME

staticconstexpr

---

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

• include/bsdfmodel/lambertian.h