Gaussian surface statistics

class gaussian_t : public wt::surface_profile::surface_profile_t

Surface with gaussian statistics. Implements sampling and evaluation.

Public Functions

inline gaussian_t(std::string id, std::unique_ptr<texture::quantity_t<rms_t>> &&sigma) noexcept

inline gaussian_t(std::string id, std::shared_ptr<texture::texture_t> &&roughness) noexcept

inline virtual variance_t variance(const texture_query_t &query) const noexcept override

Variance of the surface profile.

inline virtual rms_t rms_roughness(const texture_query_t &query) const noexcept override

RMS roughness of the surface profile.

inline virtual f_t alpha(const dir3_t &wi, const dir3_t &wo, const texture_query_t &query) const noexcept override

Fraction of scatter contained in specular term.

Parameters:

k – wavenumber

inline virtual f_t alpha(const dir3_t &wi, const texture_query_t &query) const noexcept override

Fraction of scatter contained in specular term.

Parameters:

k – wavenumber

inline virtual bool is_delta_only(wavenumber_t k) const noexcept override

inline virtual bool needs_interaction_footprint() const noexcept override

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

inline virtual f_t psd(const dir3_t &wi, const dir3_t &wo, const texture_query_t &query) const noexcept override

Evaluates the gaussian lobe power spectral density (PSD).

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

Samples a scattered direction.

inline virtual f_t pdf(const dir3_t &wi, const dir3_t &wo, const texture_query_t &query) const noexcept override

Provides the sampling density.

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

Public Static Functions

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)