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<H1><A ID="SECTION00460000000000000000"> Atmospheric Effects</A> </H1>

<P> ! Any number of atmospheric effects may be associated with the default ! medium (``air'').

<P> fogcolor thinness Add exponential fog with the specified <EM>thinness</EM> and <EM>color</EM>. *************** *** 125,131 **** mistcolor thinness <EM>zero scale</EM> Add global low-altitude mist of the specified color. The color of a ray is modulated by a fog with density that varies linearly with ! the difference in <I>z</I> coordinate (altitude) between the ray origin and the point of intersection. The thinness values specify the transmissivity of the fog for each color channel. The base altitude of the &mdash; 124,132 &mdash;- <BR> <A NAME="tex2html2" HREF="footnode_mn.html#foot221" TARGET="footer"><IMG STYLE="height: 2.17ex; vertical-align: 176.68ex; " SRC="img9.png" ALT="
\begin{defkey}{mist}{\evec{color} \evec{thinness} {\emzero scale}} Add global l.... .....* 134,139 **** --- 135,146 ---- altitude used to compute the fog. \end{defkey}
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\begin{defkey}{fogdeck}{{\em altitude} {\em offset} \evec{scale} {\em chaoscale}... ...itude fog, with transmissivity modulated by + a chaotic function. + \end{defkey}
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