19 lines
942 B
TeX
19 lines
942 B
TeX
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\newpage
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\subsection{Phase functions}
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\label{sec:phase}
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This section contains a description of all implemented medium scattering models, which
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are also known as \emph{phase functions}. These are very similar in principle to surface
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scattering models (or \emph{BSDF}s), and essentially describe where light travels after
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hitting a particle within the medium.
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The most commonly used models for smoke, fog, and other homogeneous media
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are isotropic scattering (\pluginref{isotropic}) and the Henyey-Greenstein
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phase function (\pluginref{hg}). Mitsuba also supports \emph{anisotropic}
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media, where the behavior of the medium changes depending on the direction
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of light propagation (e.g. in volumetric representations of fabric). These
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are the Kajiya-Kay (\pluginref{kkay}) and Micro-flake (\pluginref{microflake})
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models.
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Finally, there is also a phase function for simulating scattering in
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planetary atmospheres (\pluginref{rayleigh}).
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