quantity¶
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template<Quantity Q>
class quantity_t : public wt::scene::scene_element_t Simple wrapper around texture_t that scales the queried texture value by a scalar quantity. Useful when textures with physical units are required. This element should only be nested within other elements.
Public Functions
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quantity_t(quantity_t&&) = default
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quantity_t(const quantity_t&) = default
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inline bool needs_interaction_footprint() const noexcept
Returns TRUE for textures that make use of the surface interaction footprint data.
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inline vec2_t resolution() const noexcept
Returns texture resolution represented via \( \frac{\text{texels}}{\vec{uv}} \). May return an approximation. Can be infinite, e.g., for analytic textures. Can be 1, for constant textures.
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inline bool is_constant() const noexcept
Returns TRUE for textures that are constant, i.e. admit a
resolution()of exactly 1.
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inline std::shared_ptr<spectrum::spectrum_real_t> mean_spectrum() const noexcept
Average spectrum of the texture. Returns
nullptrwhen an average spectrum cannot be computed.
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inline std::optional<Q> mean_value(wavenumber_t k) const noexcept
Average value of the texture. Returns std::nullopt when an average value cannot be computed.
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inline qvec4<Q> get_RGBA(const texture_query_t &query) const noexcept
Samples the texture. Returns filtered RGBA data, without spectral upsampling. Ignores
query.k. Only relevant for some textures.
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inline auto f(const texture_query_t &query) const noexcept
Samples the texture. Returns spectrally upsampled (to wavenumber
query.k) result.- Returns:
Spectral luminance value and alpha (if any) pair.
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inline virtual scene::element::info_t description() const override
Public Static Functions
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static inline constexpr std::string scene_element_class() noexcept
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static inline std::unique_ptr<quantity_t> load(std::string id, scene::loader::loader_t *loader, const scene::loader::node_t &node, const wt::wt_context_t &context)
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quantity_t(quantity_t&&) = default