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<H3> 5.8.4 Camera Movement </H3>
<!--docid::SEC244::-->
<P>
This section describes how to move the camera.
</P><P>
<A NAME="SEC245"></A>
<H4> The Camera is a Transform </H4>
<!--docid::SEC245::-->
<P>
Internally in the engine the `<SAMP>csCamera</SAMP>' class inherits
directly from `<SAMP>csOrthoTransform</SAMP>' which inherits from
`<SAMP>csReversibleTransform</SAMP>'. If you work with `<SAMP>iCamera</SAMP>' then you
can get the reference to this transform with <CODE>camera->GetTransform()</CODE>.
In addition the transformation a camera also holds a pointer to the
current sector.
</P><P>
This means that all operations you have in `<SAMP>csOrthoTransform</SAMP>' can
be used on the camera. One of the most useful functions there is
<CODE>LookAt()</CODE> with which you can make the camera point to some spot.
Using <CODE>LookAt()</CODE> it is very easy to make a 3rd person view.
</P><P>
In addition to the standard functions from `<SAMP>csOrthoTransform</SAMP>' there
are a number of other functions that you can use. The most interesting
are <CODE>MoveWorld()</CODE> and <CODE>Move()</CODE>. These functions will move
the camera and make sure that it cannot walk through a wall and also make
sure that walking through portals will work. Both functions move the
camera a relative amount. The difference between <CODE>MoveWorld()</CODE> and
<CODE>Move()</CODE> is that the latter will move the camera in camera space.
For example, take the following code:
</P><P>
<TABLE><tr><td> </td><td class=example><pre> iCamera* camera;
camera->GetTransform ().Move (csVector3 (0, 0, 1));
</pre></td></tr></table></P><P>
This will move the camera forward in camera space. This means that the
camera will walk 'forward' :-) On the other hand:
</P><P>
<TABLE><tr><td> </td><td class=example><pre> iCamera* camera;
camera->GetTransform ().MoveWorld (csVector3 (0, 0, 1));
</pre></td></tr></table></P><P>
This will move the camera in the world so that it goes one unit in
the positive Z direction. This will happen independently of the orientation
of the camera.
</P><P>
<A NAME="SEC246"></A>
<H4> Include Files </H4>
<!--docid::SEC246::-->
<P>
The include files useful for this section are:
</P><P>
<TABLE><tr><td> </td><td class=example><pre> #include "iengine/camera.h"
#include "csgeom/transfrm.h"
</pre></td></tr></table></P><P>
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