gkGameLevel.cpp from CppDemo from Gamekit http://gamekit.googlecode.com/ with an example on how add an ogre .mesh to the gkScene through a gkGameObject

gkGameLevel.cpp

/*
-------------------------------------------------------------------------------
    This file is part of OgreKit.
    http://gamekit.googlecode.com/

    Copyright (c) 2006-2010 Charlie C.

    Contributor(s): none yet.
-------------------------------------------------------------------------------
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
-------------------------------------------------------------------------------
*/
#include "gkGameLevel.h"
#include "gkGamePlayer.h"
#include "gkGameObjectManager.h"
#include "gkFontManager.h"
#include "OgreKit.h"
#include "Ogre.h"

#ifdef OGREKIT_CPPDEMO_COMPILE_BLEND
#include "Generated/gkInlineBlendFiles.inl"
#endif

#define LEVEL_GROUP_NAME "CppDemo"


gkGameLevel::gkGameLevel()
        :    m_pickup(0),
             m_killThemAll(0),
		m_dynamicWorld(0),
             m_level(GK_LEVEL_EXIT),
             m_keyboard(0),
             m_mouse(0),
                 m_player(0)
{
        m_keyboard = gkWindowSystem::getSingleton().getKeyboard();
        m_mouse    = gkWindowSystem::getSingleton().getMouse();
        m_joy      = gkWindowSystem::getSingleton().getJoystick(0);

        gkGameObjectManager::getSingleton().addInstanceListener(this);
        gkGameObjectManager::getSingleton().addResourceListener(this);
        gkSceneManager::getSingleton().addInstanceListener(this);
        gkSceneManager::getSingleton().addResourceListener(this);
        gkGroupManager::getSingleton().addResourceListener(this);
        gkTextManager::getSingleton().addResourceListener(this);
        gkFontManager::getSingleton().addResourceListener(this);
}


gkGameLevel::~gkGameLevel()
{
        delete m_player;
        m_player = 0;

        for (UTsize i = 0; i < m_enemies.size(); i++)
                delete m_enemies[i];
        m_enemies.clear();

        gkGameObjectManager::getSingleton().removeResourceListener(this);
        gkGameObjectManager::getSingleton().removeInstanceListener(this);
        gkSceneManager::getSingleton().removeInstanceListener(this);
        gkSceneManager::getSingleton().removeResourceListener(this);
        gkGroupManager::getSingleton().removeResourceListener(this);
        gkTextManager::getSingleton().removeResourceListener(this);
        gkFontManager::getSingleton().removeResourceListener(this);

        if (m_pickup)
                gkSceneManager::getSingleton().destroy(m_pickup->getResourceHandle());
}


void gkGameLevel::loadLevel(const gkLevel& level)
{
        m_level = level;

        if (m_level == GK_LEVEL_PICKUP)
                loadPickup();
        else if (m_level == GK_LEVEL_KILL_THEM_ALL)
        {
        }
}



void gkGameLevel::loadPickup(void)
{
        if (m_pickup)
        {
                m_pickup->reinstance();
                return;
        }

#ifndef OGREKIT_CPPDEMO_COMPILE_BLEND
        gkBlendFile* playerData = gkBlendLoader::getSingleton().loadFile(gkUtils::getFile(GK_RESOURCE_PLAYER), "", LEVEL_GROUP_NAME);
#else
        gkBlendFile* playerData = gkBlendLoader::getSingleton().loadFromMemory(MOMO,MOMO_SIZE,gkBlendLoader::LO_ALL_SCENES, "", LEVEL_GROUP_NAME);
#endif

        if (!playerData || !playerData->getMainScene())
        {
                gkPrintf("GameLevel: Blend '%s' loading failed", GK_RESOURCE_PLAYER);
                return;
        }


        // log status
        gkPrintf("GameLevel: Blend '%s' loaded", GK_RESOURCE_PLAYER);


#ifndef OGREKIT_CPPDEMO_COMPILE_BLEND
        gkBlendFile* mapData = gkBlendLoader::getSingleton().loadFile(gkUtils::getFile(GK_RESOURCE_MAPS), "Pickup", LEVEL_GROUP_NAME);
#else
        gkBlendFile* mapData = gkBlendLoader::getSingleton().loadFromMemory(MAPS,MAPS_SIZE,gkBlendLoader::LO_ALL_SCENES, "Pickup", LEVEL_GROUP_NAME);
#endif
        if (!mapData || !mapData->getMainScene())
        {
                gkPrintf("GameLevel: Blend '%s'->Pickup loading failed", GK_RESOURCE_MAPS);
                return;
        }
        gkGameObject* objectCube;
	

        // log status
        gkPrintf("GameLevel: Blend '%s'->Pickup loaded", GK_RESOURCE_MAPS);

        gkScene* sc = mapData->getMainScene();

        m_pickup = ( gkScene*)gkSceneManager::getSingleton().create("PickupLevel");
        m_pickup->setHorizonColor(gkColor(0.2f, 0.2f, 0.2f));
        m_pickup->setAmbientColor(gkColor(0.5f, 0.5f, 0.5f));



        gkSceneManager::getSingleton().copyObjects(sc, m_pickup);

        m_player = new gkGamePlayer(this);
        m_player->load(playerData);

        m_pickup->createInstance();

        Ogre::Entity* ogreCube = m_pickup->getManager()->createEntity("Cube", "cube.mesh");
        
	
	objectCube = m_pickup->createObject("OgreCube");
	
		
	objectCube->createInstance();
	//std::cout << "creating an objectCube instance" << std::endl;
        objectCube->getNode()->attachObject(ogreCube);
	objectCube->setPosition(gkVector3(0,0,0.5));
	objectCube->setScale(gkVector3(0.01,0.01,0.01));
	objectCube->rotate(gkEuler(gkDegree(0), gkDegree(0),gkDegree(0)));
	
		
	m_dynamicWorld = m_pickup->getDynamicsWorld();
	m_dynamicWorld->addListener(this);
	 btCollisionShape *ogreShape = new btCylinderShapeX(btVector3(0.25, 10, 10));
	gkRigidBody* rbody = new gkRigidBody(objectCube, m_dynamicWorld);
	rbody->create();
	objectCube->attachRigidBody(rbody);
	m_dynamicWorld->createRigidBody(objectCube);
	
	
	
	
        m_pickup->addObject(objectCube);

	
	

        gkGamePlayer* enemy = m_player->clone();
        enemy->setPosition(gkVector3(0,1,1));
        m_enemies.push_back(enemy);

        enemy = enemy->clone();
        enemy->setPosition(gkVector3(1,1,1));
        m_enemies.push_back(enemy);
}



void gkGameLevel::notifyInstanceCreated(gkInstancedObject* inst)
{
        gkLogMessage("GameLevel: Instanced -> " << inst->getResourceName().getName());
}

void gkGameLevel::notifyResourceCreated(gkResource* res)
{

        gkLogMessage(res->getManagerType() << ", " << res->getResourceType() <<
                     ":handle " <<  res->getResourceHandle() << ", created " << res->getResourceName().getName());
}



void gkGameLevel::tick(gkScalar delta)
{
        // update game states
        if (m_player)
                m_player->update(delta);

        for (UTsize i = 0; i < m_enemies.size(); i++)
                m_enemies[i]->update(delta);

        if (m_keyboard->key_count > 0)
        {
                if (m_keyboard->isKeyDown(KC_ESCKEY))
                        gkEngine::getSingleton().requestExit();
        }
}




gkScene* gkGameLevel::getLevel(void)
{
        if (m_level == GK_LEVEL_PICKUP)
                return m_pickup;
        else if (m_level == GK_LEVEL_KILL_THEM_ALL)
                return m_killThemAll;
        return 0;
}