SPM surface BSDF¶
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class surface_spm_t : public wt::bsdf::bsdf_t
Generic smooth to moderately-rough surface with arbitrary (real or complex) IOR and surface profile. The surface might be a transmissive dielectric or a conductor at different parts of the spectrum. Scattering is formalised via 1-st order SPM.
Public Functions
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surface_spm_t(surface_spm_t&&) = default
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inline auto IOR(const wavenumber_t k) const noexcept
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inline auto reflectivity_scale(const wavenumber_t &k) const noexcept
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inline auto transmissivity_scale(const wavenumber_t &k) const noexcept
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inline virtual std::optional<f_t> albedo(const wavenumber_t k) const noexcept override
Spectral albedo. Returns std::nullopt when albedo cannot be computed.
- Parameters:
k – wavenumber
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inline virtual lobe_mask_t lobes(wavenumber_t k) const noexcept override
Returns mask of all available lobes for this BSDF at particular wavenumber.
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inline virtual bool is_delta_only(wavenumber_t k) const noexcept override
Does this BSDF comprise of only delta lobes?
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inline virtual bool is_delta_lobe(wavenumber_t k, std::uint32_t lobe) const noexcept override
Is a lobe a delta lobe?
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virtual bsdf_result_t f(const dir3_t &wi, const dir3_t &wo, const bsdf_query_t &query) const noexcept override
Evaluates the BSDF. Accounts for the cosine foreshortening term.
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virtual std::optional<bsdf_sample_t> sample(const dir3_t &wi, const bsdf_query_t &query, sampler::sampler_t &sampler) const noexcept override
Samples the BSDF. The returned weight is bsdf/pdf.
- Parameters:
S – normalized Stokes parameters vector that describes the polarimetric properties of incident radiation.
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virtual solid_angle_density_t pdf(const dir3_t &wi, const dir3_t &wo, const bsdf_query_t &query) const noexcept override
Provides the sample density.
- Parameters:
S – normalized Stokes parameters vector that describes the polarimetric properties of incident radiation.
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inline virtual f_t eta(const dir3_t &wi, const dir3_t &wo, const wavenumber_t k) const noexcept override
Computes the refractive-index ratio: eta at exit / eta at entry.
- Parameters:
k – wavenumber
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virtual scene::element::info_t description() const override
Public Static Functions
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static std::unique_ptr<bsdf_t> load(std::string id, scene::loader::loader_t *loader, const scene::loader::node_t &node, const wt::wt_context_t &context)
Public Static Attributes
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static constexpr int lobe_specular = 0
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static constexpr int lobe_scattered = 1
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surface_spm_t(surface_spm_t&&) = default