This {\em document\/} is my exam project (``afl{\o}sningsopgave'') for
the course 
``\linkf{Relativistic Computer Dynamics and Visualization}
      {http://www.astro.ku.dk/\~{}aake/teaching/rel/}''
by 
\linkf{{\AA}ke Nordlund}{http://www.astro.ku.dk/\~{}aake/}
and
\linkf{Axel Brandenburg}{http://antares.ncl.ac.uk/\~{}brandenb/}.
The document is about three things:
an aspect of the Theory of General Relativity, {\em viz.\/}
null geodesics around a Kerr black hole,
visualization, 
and Web authoring.

\begin{latexonly}
{\em Please note\/}, 
that you are right now reading the \LaTeX\ (``paper'')
version of this document.
As explained further down, this is only a secondary product,
with the primary one being the HTML version (the {\em Web exhibition\/}),
which can be found at
{\tt http://www.astro.ku.dk/\~{}milvang/RelViz/}~.
\end{latexonly}
%
\begin{htmlonly}
You are right now reading the HTML version of the document,
which is the primary one. Note, however,
that a secondary product, a \LaTeX\ (``paper'') version in
\link{PostScript}
     {http://www.astro.ku.dk/\~{}milvang/RelViz/index.ps}
or
\link{gzip'ed PostScript}
     {http://www.astro.ku.dk/\~{}milvang/RelViz/index.ps.gz},
(in color)
is available.
\end{htmlonly}
%
