Class surface_profile_t

• Defined in File surface_profile.hpp

Inheritance Relationships

Base Type

• public wt::scene::scene_element_t (Class scene_element_t)

Derived Types

• public wt::surface_profile::dirac_t (Class dirac_t)

• public wt::surface_profile::fractal_t (Class fractal_t)

• public wt::surface_profile::gaussian_t (Class gaussian_t)

Class Documentation

class surface_profile_t : public wt::scene::scene_element_t

Quantifies the statistical profile of a surface. The primary quantity is the surface’s power spectral density (PSD), characterizing effective roughness. Surface profiles are wavelength dependent.

Subclassed by wt::surface_profile::dirac_t, wt::surface_profile::fractal_t, wt::surface_profile::gaussian_t

Public Types

using rms_t = quantity<inverse(isq::length[u::mm])>

using rms2_t = quantity<inverse(isq::area[square(u::mm)])>

using recp_rms_t = quantity<isq::length[u::mm]>

using recp_rms2_t = quantity<isq::area[square(u::mm)]>

using variance_t = quantity<inverse(isq::area[square(u::mm)])>

Public Functions

inline surface_profile_t(std::string id)

surface_profile_t(surface_profile_t&&) = default

virtual ~surface_profile_t() noexcept = default

virtual bool is_delta_only(wavenumber_t k) const noexcept = 0

virtual bool needs_interaction_footprint() const noexcept = 0

Returns true for profiles that make use of the surface interaction footprint data.

virtual variance_t variance(const texture_query_t &query) const noexcept = 0

Variance of the surface profile.

virtual rms_t rms_roughness(const texture_query_t &query) const noexcept = 0

RMS roughness of the surface profile.

virtual f_t alpha(const dir3_t &wi, const dir3_t &wo, const texture_query_t &query) const noexcept = 0

Fraction of scatter contained in specular term.

Parameters:

k – wavenumber

virtual f_t alpha(const dir3_t &wi, const texture_query_t &query) const noexcept = 0

Fraction of scatter contained in specular term.

Parameters:

k – wavenumber

virtual f_t psd(const dir3_t &wi, const dir3_t &wo, const texture_query_t &query) const noexcept = 0

Evaluates the surface profile power spectral density (PSD).

virtual surface_profile_sample_ret_t sample(const dir3_t &wi, const texture_query_t &query, sampler::sampler_t &sampler) const noexcept = 0

Samples the surface profile.

virtual f_t pdf(const dir3_t &wi, const dir3_t &wo, const texture_query_t &query) const noexcept = 0

Provides the sampling density.

virtual scene::element::info_t description() const override = 0

Public Static Functions

static inline constexpr std::string scene_element_class() noexcept

static std::unique_ptr<surface_profile_t> load(std::string id, scene::loader::loader_t *loader, const scene::loader::node_t &node, const wt::wt_context_t &context)