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\subsection{Atmospheric effects}
Tachyon currently only implements one atmospheric effect,
simple distance-based fog.
\subsubsection{Fog}
\index{fog}
Tachyon provides a simple distance-based fog effect intended to provide
functionality similar to that found in OpenGL, for compatibility with
software that requires an OpenGL-like fog implementation. Much like
OpenGL, Tachyon provides linear, exponential, and exponential-squared fog.
\begin{verbatim}
FOG
LINEAR START 0.0 END 50.0 DENSITY 1.0 COLOR 1.0 1.0 1.0
\end{verbatim}
\begin{verbatim}
FOG
EXP START 0.0 END 50.0 DENSITY 1.0 COLOR 1.0 1.0 1.0
\end{verbatim}
\begin{verbatim}
FOG
EXP2 START 0.0 END 50.0 DENSITY 1.0 COLOR 1.0 1.0 1.0
\end{verbatim}
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