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<H1><A ID="SECTION00130000000000000000"> The Default Medium</A> </H1>

<P> The default medium is the medium which surrounds and encompasses all of the objects in the scene; it is the ``air'' through which eye rays usually travel before hitting an object. The properties of the default medium may be modified through the use of the <TT>atmosphere</TT> keyword.

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\begin{defkey}{atmosphere}{[{\em N\/}] [{\em atmospheric effects}]}
If given, {....
.....every object in the scene (e.g., rays
emanating from the camera).
\end{defkey}
"> <BR>

<P> <PRE> /* * Red sphere on a grey plane, with fog. */ eyep 0. -10. 2. atmosphere fog .8 .8 .8 14. 14. 14. plane 0 0 0 0 0 1 sphere diffuse 0.8 0 0 1.5 0 0 1.5 </PRE>

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