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<H2> 3.1 Common Command Line Options </H2>
<!--docid::SEC120::-->
<P>
All Crystal Space applications respond to a common set of command line
options. Many applications define additional options which are specific
to that particular application.
</P><P>
The most immediately useful command line option which all applications
respond to is `<SAMP>-help</SAMP>'. This command list all of the other options to
which an application responds.
</P><P>
The default setting for each command line option is set internally in the
program unless there is a corresponding line for it in the configuration file.
For example, normally the default for <CODE>-gamma</CODE> is <CODE>1.0</CODE> (the default
brightness level). But when <CODE>GAMMA=2.0</CODE> is set in configuration file
`<TT>soft3d.cfg</TT>' the default will be <CODE>2.0</CODE> instead. Command line
options always override default values.
</P><P>
Some interesting options to play with are:
</P><P>
<DL COMPACT>
<DT><CODE>-mode=640x480</CODE>
<DD>Use this option to set the size of the display.
<P>
<DT><CODE>-canvas=sdl2d</CODE>
<DD>Use this option to select the type of 2D canvas to use.
<P>
<DT><CODE>-video=opengl</CODE>
<DD>(or direct3d, software, ...).
Use this option to select type of display driver to use. Other options
are <CODE>software</CODE>, <CODE>direct3d</CODE>, etc.
<P>
<DT><CODE>-recalc</CODE>
<DD>Use this option to force recalculation of all cached information about a
level, such as lightmaps and visibility data. This is a convenient shortcut
to typing the other commands individually, such as `<SAMP>-relight</SAMP>',
`<SAMP>-revis</SAMP>', etc.
<P>
<DT><CODE>-norecalc</CODE>
<DD>Inhibit automatic recalculation of cached information if the engine determines
that it is out of date.
<P>
<DT><CODE>-relight</CODE>
<DD>Use this option to recalculate all lightmaps after you changed lighting
or geometry in a level that you're trying. If you don't do this you either
get the old lightmaps or no lightmaps at all.
<P>
<DT><CODE>-norelight</CODE>
<DD>Inhibit automatic recalculation of the lightmap information which can occur
if the engine finds that the existing lightmaps are out of date.
<P>
<DT><CODE>-revis</CODE>
<DD>Use this option to recalculate all visibility information after you have
changed geometry in a level. This will force the engine to ignore the
existing cached visibility information and recalculate it from scratch.
<P>
<DT><CODE>-norevis</CODE>
<DD>Inhibit automatic recalculation of visibility information if the engine
determines that it is out of date.
<P>
<DT><CODE><EM>FIXME</EM></CODE>
<DD>Document the remaining common command line options.
</DL>
<A NAME="Configuration File"></A>
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