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<TITLE>Using linear fog</TITLE>
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<CENTER>Working with fog</CENTER>
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<CENTER><B><I>Using linear fog</I></B></CENTER>
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<DD><LI><B><TT><FONT COLOR=#00FF00 SIZE=+2>LinearFog</FONT></TT></B> extends the <B><TT><FONT COLOR=#00FF00 SIZE=+2>Fog</FONT></TT></B> class
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	<DD><LI>Thickness increases linearly with distance
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<DD><LI>Use linear fog to create more easily controlled fog,
though less realistic
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<DD><LI>Set <I>front</I> and <I>back</I> distances to control density
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	<DD>effect = (back - distance) / (back - front)
	<DD>color = effect * shapeColor + (1-effect) * fogColor
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