\documentstyle[psfig]{article}
\begin{document}


\section*{Mathmatical Models for Shading}

\begin{figure}[h]
\centerline{\psfig{figure=diffuse.eps,width=3in}}
\end{figure}

\subsection*{Ambient light}
\Large{\[
I=I_{a}k_{a} 
\]}

\subsection*{Diffuse light}
\Large{\[
I= I_{p} k_{d} \cos \theta
\]}
\centerline{or}
\Large{\[I=I_{p} k_{d} (\bar{N} \cdot \bar{L}) \]}


\subsection*{Together}
\Large{\[
I=I_{a}k_{a} + I_{p} k_{d} (\bar{N} \cdot \bar{L})
\]}


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