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<H3> 5.4.3 Locating the Camera </H3>
<!--docid::SEC184::-->
<P>
`<SAMP>flarge</SAMP>' contains a number of sectors and various objects, and those
are now all loaded in memory. However this is not enough. We also have
to set the camera to some sector and position in that world. In the
previous tutorials we simply used the sector that we just created
and a fixed position in that sector (keep in mind that in Crystal
Space a position in space is always defined as a sector in combination
with a position). When loading a map we can't work that way because
we don't know which sectors are in the map (unless we make an application
that can only read one level, but that's not very flexible) and we
also don't know where we can safely put our camera. In the map files
it is possible to specify one or more starting positions. We will
query the engine for such a starting position and initialize our
view (camera) to that. This happens with the following code:
</P><P>
First add the following to the include section:
</P><P>
<TABLE><tr><td> </td><td class=example><pre>#include "iengine/campos.h"
</pre></td></tr></table></P><P>
Then add the following after <CODE>engine->Prepare()</CODE> in <CODE>LoadMap()</CODE>:
</P><P>
<TABLE><tr><td> </td><td class=example><pre> // Find the starting position in this level.
csVector3 pos (0, 0, 0);
if (engine->GetCameraPositions ()->GetCount () > 0)
{
// There is a valid starting position defined in the level file.
iCameraPosition* campos = engine->GetCameraPositions ()->Get (0);
room = engine->GetSectors ()->FindByName (campos->GetSector ());
pos = campos->GetPosition ();
}
else
{
// We didn't find a valid starting position. So we default
// to going to room called 'room' at position (0,0,0).
room = engine->GetSectors ()->FindByName ("room");
}
if (!room)
{
csReport (object_reg, CS_REPORTER_SEVERITY_ERROR,
"crystalspace.application.simple",
"Can't find a valid starting position!");
return false;
}
view->GetCamera ()->SetSector (room);
view->GetCamera ()->GetTransform ().SetOrigin (pos);
iTextureManager* txtmgr = g3d->GetTextureManager ();
txtmgr->SetPalette ();
return true;
}
</pre></td></tr></table></P><P>
First we see how many camera positions there were defined in the
map by using <CODE>iEngine::GetCameraPositionCount()</CODE>. If this is 0
then the map didn't define a starting position. In that case we will
assume there is a sector called 'room' and we will start the camera
at (0,0,0) in that sector. But otherwise we will use the first
starting position defined in the map.
</P><P>
This is all. After adding this code this application will now load
the 'flarge' map and display it so you can run around in this level.
</P><P>
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