How to get current scene interface and read number of mesh items in scene from it.

get_current_scene.cpp

/*
This snippet demonstrates how to get currently selected scene interface and
obtain number of mesh items in the scene from it.

Generally, selections are managed via selection service and are stored
as packets. So what we are doing is we are getting recent selection
of the cinema type from the selection service which comes as a pointer
to the selection packet. We then use scene packet translation object
to extract scene interface out of the packet we received pointer to from
selection service.
Finally, we use scene service to look up mesh type integer code
and use ItemCount() method on scene interface to get a number of items
of required type - meshes in our case.
 */

CLxUser_SelectionService	sel_svc;
CLxUser_SceneService        scn_service;

CLxUser_ScenePacketTranslation  scene_trans_pkt;
CLxUser_Scene		            scene;
LXtItemType                     mesh_type_code;
unsigned int                    mesh_count = 0;

scene_trans_pkt.autoInit();
if(!scene_trans_pkt.test())
{
    // abort here although that shouldn't really happen
}
void *scn_pkt = sel_svc.Recent(LXiSEL_CINEMA);
scene_trans_pkt.Scene(scn_pkt, scene);
scn_service.ItemTypeLookup(LXsITYPE_MESH, &mesh_type_code);
scene.ItemCount(mesh_type_code, &mesh_count);