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<h3 class="subsection"> 4.21.1 Clicking on Objects </h3>
<p>This section describes how you can find out on which object a mouse
has clicked.
</p>
<a name="1"></a>
<h4 class="subsubheading"> The Code </h4>
<p>Best way to explain this is by showing code:
</p>
<table><tr><td> </td><td><pre class="example">iMeshWrapper* ClickedObject (iCamera* camera, int mousex, int mousey)
{
// Setup a 2D vector with our mouse position. We invert the y
// (based on vertical screen dimension) because CS assumes y=0
// is down for 3D calculations.
csVector2 v2d (mousex, camera->GetShiftY () * 2 - mousey);
// We calculate the inverse perspective of this 2D point at
// z=100. This results in a 3D position in camera space at
// z=100 that directly corresponds to the 2D position we
// clicked on. We use z=100 to ensure that we will at least
// hit all objects that are before that distance.
csVector3 v3d;
camera->InvPerspective (v2d, 100, v3d);
// We are going to cast a beam in the current sector of the
// camera from our camera position in the direction of the
// 'v3d' point. First we transform the v3d camera space
// location to world space.
csVector3 startbeam = camera->GetTransform ().GetOrigin ();
csVector3 endbeam = camera->GetTransform ().This2Other (v3d);
csVector3 intersect;
// Now do the actual intersection.
int poly = -1;
iSector* beamsector = camera->GetSector ();
iMeshWrapper* mesh =
beamsector->HitBeamPortals(startbeam, endbeam, intersect, &poly);
return mesh;
}
</pre></td></tr></table>
<a name="2"></a>
<h4 class="subsubheading"> Include Files </h4>
<p>The include files useful for this section are:
</p>
<table><tr><td> </td><td><pre class="example">#include <csgeom/transfrm.h>
#include <iengine/camera.h>
#include <iengine/sector.h>
#include <iengine/mesh.h>
</pre></td></tr></table>
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