source: trunk/VUT/work/TestCullingTerrain/TestCullingTerrainApplication.cpp @ 106

/**
    \file 
        TestCullingTerrainApplication.cpp
    \brief
        Tests the visibility culling algorithm
*/

#include <OgreNoMemoryMacros.h>
#include <CEGUI/CEGUI.h>
#include <../CEGUIRenderer/include/OgreCEGUIRenderer.h>
#include <../CEGUIRenderer/include/OgreCEGUIResourceProvider.h>
#include <../CEGUIRenderer/include/OgreCEGUITexture.h>
#include <OgreMemoryMacros.h>

#include <Ogre.h>
#include "OgreReferenceAppLayer.h"
//#include "OgreRefAppWorld.h"
#include "TestCullingTerrainApplication.h"

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#define VIZ_VIEWPORT_Z_ORDER 10

/*******************************************************/
/*     TestCullingTerrainApplication implementation    */
/*******************************************************/

//-----------------------------------------------------------------------
TestCullingTerrainApplication::~TestCullingTerrainApplication()
{
        if(mTerrainContentGenerator)
                delete mTerrainContentGenerator;
        //if(mRenderTargetListener)     delete mRenderTargetListener;
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createCamera()
{
        // create the camera
        mCamera = mSceneMgr->createCamera("PlayerCam");
        
        /** set a nice viewpoint
        *       we use a camera node here and apply all transformations on it instead
        *       of applying all transformations directly to the camera
        *       because then the camera is displayed correctly in the visualization
        */
        
        mCamNode = mSceneMgr->getRootSceneNode()->createChildSceneNode(
                "CamNode1", Vector3(707, 5000, 528));
        //mCamera->setPosition(707, 5000, 528);
        mCamNode->setOrientation(Quaternion(-0.3486, 0.0122, 0.9365, 0.0329));
        
        mCamNode->attachObject(mCamera);

        //-- create visualization camera
        mVizCamera = mSceneMgr->createCamera("VizCam");
        mVizCamera->setPosition(mCamNode->getPosition());

        mVizCamera->setNearClipDistance(1);
        mCamera->setNearClipDistance(1);

        // infinite far plane?
        if (mRoot->getRenderSystem()->getCapabilities()->hasCapability(RSC_INFINITE_FAR_PLANE))
        {
                mVizCamera->setFarClipDistance(0);
                mCamera->setFarClipDistance(0);
        }
        else
        {
                 mVizCamera->setFarClipDistance(20000);
                 mCamera->setFarClipDistance(20000);
        }       
}

//-----------------------------------------------------------------------
bool TestCullingTerrainApplication::setup()
{
        bool result = ExampleApplication::setup();

        createRenderTargetListener();

        return result;
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createRenderTargetListener()
{
        mWindow->addListener(new VisualizationRenderTargetListener(mSceneMgr));
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createScene()
{
        // Set ambient light
        mSceneMgr->setAmbientLight(ColourValue(0.5, 0.5, 0.5));
        
        // Create a light
        Light* l = mSceneMgr->createLight("MainLight");
        // Accept default settings: point light, white diffuse, just set position
        // NB I could attach the light to a SceneNode if I wanted it to move automatically with
        // other objects, but I don't
        l->setPosition(20,80,50);

        // --Fog
        // NB it's VERY important to set this before calling setWorldGeometry 
        // because the vertex program picked will be different
        ColourValue fadeColour(0.93, 0.86, 0.76);
        mWindow->getViewport(0)->setBackgroundColour(fadeColour);
        //mSceneMgr->setFog( FOG_LINEAR, fadeColour, .001, 500, 1000);
        
        // Create a skybox
        mSceneMgr->setSkyBox(true, "Examples/SpaceSkyBox", 5000, false);
        
        std::string terrain_cfg("terrain.cfg");
#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
        terrain_cfg = mResourcePath + terrain_cfg;
#endif
        mSceneMgr->setWorldGeometry(terrain_cfg);
        
        //-- CEGUI setup
        setupGui();

        //-- terrain content setup

        // HACK: necessary to call once before the content creation for
        // terrain initialisation
        mSceneMgr->_renderScene(mCamera, mWindow->getViewport(0), true);

        mTerrainContentGenerator = new TerrainContentGenerator(mSceneMgr);
        mTerrainContentGenerator->SetMaxPos(Vector3(3000.0f, 5000.0f, 3000.0f));

        mTerrainContentGenerator->GenerateScene(1500, "robot.mesh");
//      mTerrainContentGenerator->GenerateScene(500, "ninja.mesh");

        // no limitations needed anymore: the user can set 
        // objects also on peaks of terrain
        mTerrainContentGenerator->SetMaxHeight(5000); 
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::setupGui()
{
         mGUIRenderer = new CEGUI::OgreCEGUIRenderer(mWindow, Ogre::RENDER_QUEUE_OVERLAY, 
                 false, 3000, ST_EXTERIOR_CLOSE);
     mGUISystem = new CEGUI::System(mGUIRenderer);

         // Mouse
     CEGUI::SchemeManager::getSingleton().loadScheme((CEGUI::utf8*)"TaharezLook.scheme");
     CEGUI::MouseCursor::getSingleton().setImage("TaharezLook", "MouseArrow");
         mGUISystem->setDefaultMouseCursor(
                (CEGUI::utf8*)"TaharezLook", (CEGUI::utf8*)"MouseArrow");

         CEGUI::MouseCursor::getSingleton().show();
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createFrameListener()
{
        mFrameListener= new MouseQueryListener(mWindow, mCamera, mSceneMgr, 
                mGUIRenderer, mTerrainContentGenerator, mVizCamera, mCamNode);
        mFrameListener->showDebugOverlay(true);
        mRoot->addFrameListener(mFrameListener);
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::chooseSceneManager()
{
        mSceneMgr = mRoot->getSceneManager(ST_EXTERIOR_CLOSE);
}
/***********************************************/
/*      MouseQueryListener implementation      */
/***********************************************/
//-----------------------------------------------------------------------
MouseQueryListener::MouseQueryListener(RenderWindow* win, Camera* cam, 
                                                                           SceneManager *sceneManager, 
                                                                           CEGUI::Renderer *renderer,
                                                                           TerrainContentGenerator *sceneGenerator,
                                                                           Camera *vizCamera,
                                                                           SceneNode *camNode): 
ExampleFrameListener(win, cam, false, true), 
mGUIRenderer(renderer), 
mShutdownRequested(false), 
mLMouseDown(false),
mRMouseDown(false),
mSceneMgr(sceneManager),
mCurrentObject(NULL),
mTerrainContentGenerator(sceneGenerator),
mVisibilityThreshold(0),
mCurrentAlgorithm(GtpVisibility::VisibilityEnvironment::COHERENT_HIERARCHICAL_CULLING),
mShowOctree(false),
mUseVisibilityCulling(true),
mUseOptimization(true),
mVizCamera(vizCamera),
mShowVisualization(false),
mRenderNodesForViz(false),
mVizCameraHeight(Real(2500.0)),
mCamNode(camNode),
mCullCamera(false),
mState(WALKTHROUGH),
mCurrentFrame(1)
{
        // Reduce move speed
        mMoveSpeed = 50;
        mRotateSpeed *= 2;
    
        // Register this so that we get mouse events.
        mEventProcessor->addMouseListener(this);
        mEventProcessor->addMouseMotionListener(this);
        mEventProcessor->addKeyListener(this);

        mRayQueryExecutor = new RayQueryExecutor(mSceneMgr);
        
        // show overlay
        Overlay* pOver = OverlayManager::getSingleton().getByName("Example/VisibilityDemoOverlay"); 

        mAlgorithmInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/AlgorithmInfo");
        mThresholdInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/ThresholdInfo");
        
        mFrustumCulledNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/FrustumCulledNodesInfo");
        mQueryCulledNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/QueryCulledNodesInfo");
    mTraversedNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/TraversedNodesInfo");
        mHierarchyNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/HierarchyNodesInfo");
        mRenderedNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/RenderedNodesInfo");
        mObjectsInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/ObjectsInfo");
        mUseOptimizationInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/UseOptimizationInfo");
        mQueriesIssuedInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/QueriesIssuedInfo");
        
        mAlgorithmInfo->setCaption(": " + mCurrentAlgorithmCaptions[mCurrentAlgorithm]);
        mThresholdInfo->setCaption(": 0");
        mFrustumCulledNodesInfo->setCaption(": 0");
        mQueryCulledNodesInfo->setCaption(": 0");
        mTraversedNodesInfo->setCaption(": 0");
        mHierarchyNodesInfo->setCaption(": 0");
        mRenderedNodesInfo->setCaption(": 0");
        mObjectsInfo->setCaption(": 0");
        mUseOptimizationInfo->setCaption(": true");
        mQueriesIssuedInfo->setCaption(": 0");

        setAlgorithm(mCurrentAlgorithm);

        mSceneMgr->setOption("UseOptimization", &mUseOptimization);
        mSceneMgr->setOption("UseVisibilityCulling", &mUseVisibilityCulling);
        mSceneMgr->setOption("ShowOctree", &mShowOctree);
        mSceneMgr->setOption("CullCamera", &mCullCamera);
        mSceneMgr->setOption("ShowVisualization", &mShowVisualization);
        mSceneMgr->setOption("RenderNodesForViz", &mRenderNodesForViz);

        pOver->show();
} 
//-----------------------------------------------------------------------
MouseQueryListener::~MouseQueryListener()
{
        delete mRayQueryExecutor;
}
//-----------------------------------------------------------------------
void MouseQueryListener::mouseMoved(MouseEvent *e)
{
        // Update CEGUI with the mouse motion
    CEGUI::System::getSingleton().injectMouseMove(e->getRelX() * 
                mGUIRenderer->getWidth(), e->getRelY() * mGUIRenderer->getHeight());
}
//-----------------------------------------------------------------------
void MouseQueryListener::mousePressed(MouseEvent* e)
{
     // Left mouse button down
     if (e->getButtonID() & InputEvent::BUTTON0_MASK)
     {
                 CEGUI::MouseCursor::getSingleton().hide();

                 // Setup the ray scene query
         Ray mouseRay = mCamera->getCameraToViewportRay(e->getX(), e->getY());
   
                 Vector3 queryResult;
                 
                 // Get results, create a node/entity on the position
                 mCurrentObject = mTerrainContentGenerator->GenerateSceneObject(
                         mouseRay.getOrigin(), mouseRay.getDirection(), "robot.mesh");
                
         mLMouseDown = true; 
     }
     // Right mouse button down
     else if (e->getButtonID() & InputEvent::BUTTON1_MASK)
     {
         CEGUI::MouseCursor::getSingleton().hide();
         mRMouseDown = true;
     }
} // mousePressed
//-----------------------------------------------------------------------
void MouseQueryListener::mouseReleased(MouseEvent* e)
{
    // Left mouse button up
    if (e->getButtonID() & InputEvent::BUTTON0_MASK)
    {
                CEGUI::MouseCursor::getSingleton().show();
        mLMouseDown = false;
    }
    // Right mouse button up
    else if (e->getButtonID() & InputEvent::BUTTON1_MASK)
    {
        CEGUI::MouseCursor::getSingleton().show();
        mRMouseDown = false;
    }
} 
//-----------------------------------------------------------------------
void MouseQueryListener::mouseDragged(MouseEvent *e)
 {
         // If we are dragging the left mouse button.            
         if (mLMouseDown)
     {
                 Vector3 queryResult;
                 Ray mouseRay = mCamera->getCameraToViewportRay(e->getX(), e->getY());

                 if (mRayQueryExecutor->executeRayQuery(&queryResult, mouseRay))
                 {
                         if (mCurrentObject)
                         {
                                 mCurrentObject->setPosition(queryResult);
                         }
                 }
     }
         // If we are dragging the right mouse button.
         if (mRMouseDown)
         {
                 //mCamera->yaw(-e->getRelX() * mRotateSpeed);
                 //mCamera->pitch(-e->getRelY() * mRotateSpeed);
                 mCamNode->yaw(-e->getRelX() * mRotateSpeed);
                 mCamNode->pitch(-e->getRelY() * mRotateSpeed);
         }
}
//-----------------------------------------------------------------------
bool MouseQueryListener::frameStarted(const FrameEvent &evt)
{
        switch (mState)
        {
        case REPLAY:
                SetCurrentCameraPath(mCamNode);
                mCamNode->setPosition(mCameraPath[mCurrentFrame].position);
                mCamNode->setOrientation(mCameraPath[mCurrentFrame].orientation);
                (mCurrentFrame++) % mCameraPath.size();
                break;
        case WALKTHROUGH:
                Clamp2Terrain();

        case RECORD:
                AddCameraPath(mCamNode);
                break;
        default:
                break;
        };
        
        if (mShowVisualization)
        {
                // important for visualization => draw octree bounding boxes
                mSceneMgr->setOption("ShowOctree", &mShowVisualization);
                // also render geometry?
                mSceneMgr->setOption("RenderNodesForViz", &mRenderNodesForViz);

                // -- setup visualization camera
                mVizCamera->setPosition(0, 0, 0);
                mVizCamera->setOrientation(Quaternion::IDENTITY);

                Vector3 camPos = mCamNode->getPosition();
                mVizCamera->setPosition(camPos.x, mVizCameraHeight, camPos.z);

                // Point down -Z axis
                mVizCamera->pitch(Radian(Degree(270.0)));
        
                // Rotation arounnd X axis
                mVizCamera->yaw(Math::ATan2(-mCamera->getDerivedDirection().x, 
                        -mCamera->getDerivedDirection().z));
                
                mVizCamera->moveRelative(Vector3(0, 800, 0));
        }

        return ExampleFrameListener::frameStarted(evt);
}
//-----------------------------------------------------------------------
void MouseQueryListener::Clamp2Terrain()
{
        // clamp to terrain
        Vector3 camPos = mCamNode->getPosition();
        Vector3 queryResult;

        if (mRayQueryExecutor->executeRayQuery(&queryResult, 
                        Vector3(camPos.x, 5000.0f, camPos.z), Vector3::NEGATIVE_UNIT_Y))
        {
                mCamNode->setPosition(camPos.x, queryResult.y + 10, camPos.z);
        }
}
//-----------------------------------------------------------------------
bool MouseQueryListener::frameEnded(const FrameEvent& evt)
{
        if (mShutdownRequested)
                return false;

    if (timeDelay >= 0) 
        timeDelay -= evt.timeSinceLastFrame;

    KEY_PRESSED(KC_SPACE, 0.3, nextAlgorithm());

        KEY_PRESSED(KC_O, 0.3, toggleUseOptimization());
        KEY_PRESSED(KC_T, 0.3, toggleShowOctree());
        KEY_PRESSED(KC_C, 0.3, toggleUseVisibilityCulling());
        KEY_PRESSED(KC_1, 0.3, toggleShowViz());
        KEY_PRESSED(KC_2, 0.3, toggleRenderNodesForViz());
        KEY_PRESSED(KC_SUBTRACT, 0, changeThreshold(-10));
        KEY_PRESSED(KC_ADD, 0, changeThreshold(10));
        KEY_PRESSED(KC_3, 0, zoomVizCamera(50));
        KEY_PRESSED(KC_4, 0, zoomVizCamera(-50));
        KEY_PRESSED(KC_F1, 0, setState(RECORD));
        KEY_PRESSED(KC_F2, 0, setState(REPLAY));
        KEY_PRESSED(KC_F3, 0, setState(WALKTHROUGH));
        updateStats();

        return ExampleFrameListener::frameStarted(evt) && ExampleFrameListener::frameEnded(evt);
}
void MouseQueryListener::moveCamera()
{
        mCamNode->yaw(mRotX);
        mCamNode->pitch(mRotY);
        mCamNode->translate(mCamNode->getLocalAxes(), mTranslateVector);
}
//-----------------------------------------------------------------------
void MouseQueryListener::changeThreshold(int incr)
{
        mVisibilityThreshold += incr; 
        if(mVisibilityThreshold < 0) mVisibilityThreshold = 0;
        
        char str[100]; sprintf(str,": %d", mVisibilityThreshold);

        mSceneMgr->setOption("Threshold", &mVisibilityThreshold); 
        mThresholdInfo->setCaption(str);
}
//-----------------------------------------------------------------------
bool MouseQueryListener::processUnbufferedKeyInput(const FrameEvent& evt)
{    
        if (mInputDevice->isKeyDown(KC_RIGHT))
        {
                mCamNode->yaw(-mRotScale);
                return true;
        }
        if (mInputDevice->isKeyDown(KC_LEFT))
        {
                mCamNode->yaw(mRotScale);
                return true;
        }

        return ExampleFrameListener::processUnbufferedKeyInput(evt);
}
//-----------------------------------------------------------------------
void MouseQueryListener::zoomVizCamera(int zoom)
{
        mVizCameraHeight += zoom; 
        if(mVizCameraHeight < 0) mVizCameraHeight = 0;
}
//-----------------------------------------------------------------------
void MouseQueryListener::nextAlgorithm()
{
        mCurrentAlgorithm = ++mCurrentAlgorithm % 
                GtpVisibility::VisibilityEnvironment::NUM_CULLING_MANAGERS,

        setAlgorithm(mCurrentAlgorithm);
}
//-----------------------------------------------------------------------
void MouseQueryListener::setAlgorithm(int algorithm)
{
        mAlgorithmInfo->setCaption(": " + mCurrentAlgorithmCaptions[mCurrentAlgorithm]);
        mSceneMgr->setOption("Algorithm", &mCurrentAlgorithm);
}
//-----------------------------------------------------------------------
void MouseQueryListener::updateStats()
{
        unsigned int opt = 0;
        char str[100];
        
        mSceneMgr->getOption("NumFrustumCulledNodes", &opt); sprintf(str,": %d", opt); 
        mFrustumCulledNodesInfo->setCaption(str);
        
        mSceneMgr->getOption("NumQueriesIssued", &opt); sprintf(str,": %d", opt); 
        mQueriesIssuedInfo->setCaption(str);
        
        mSceneMgr->getOption("NumQueryCulledNodes", &opt); sprintf(str,": %d", opt); 
        mQueryCulledNodesInfo->setCaption(str);
        
        mSceneMgr->getOption("NumTraversedNodes", &opt); sprintf(str,": %d", opt); 
        mTraversedNodesInfo->setCaption(str);

        mSceneMgr->getOption("NumHierarchyNodes", &opt); sprintf(str,": %d", opt); 
        mHierarchyNodesInfo->setCaption(str);

        mSceneMgr->getOption("NumRenderedNodes", &opt); sprintf(str,": %d", opt); 
        mRenderedNodesInfo->setCaption(str);

        sprintf(str,": %d", mTerrainContentGenerator->GetObjectCount()); 
        mObjectsInfo->setCaption(str);
}
//-----------------------------------------------------------------------
void MouseQueryListener::toggleUseOptimization()
{
        mUseOptimization = !mUseOptimization;

        mSceneMgr->setOption("UseOptimization", &mUseOptimization);

        if (mUseOptimization)
                mUseOptimizationInfo->setCaption(": true");
        else
                mUseOptimizationInfo->setCaption(": false");
}
//-----------------------------------------------------------------------
void MouseQueryListener::toggleShowOctree()
{
        mShowOctree = !mShowOctree;

        mSceneMgr->setOption("ShowOctree", &mShowOctree);
}
//-----------------------------------------------------------------------
void MouseQueryListener::toggleUseVisibilityCulling()
{
        mUseVisibilityCulling = !mUseVisibilityCulling;

        mSceneMgr->setOption("UseVisibilityCulling", &mUseVisibilityCulling);
}
//-----------------------------------------------------------------------
void MouseQueryListener::toggleShowViz()
{
        mShowVisualization = !mShowVisualization;

        // create viewport with priority VIZ_VIEWPORT_Z_ORDER: 
        // will be rendered over standard viewport
        if (mShowVisualization)
        {       
                Viewport *vizvp = mWindow->addViewport(mVizCamera, 
                        VIZ_VIEWPORT_Z_ORDER, 0.6, 0.6, 0.4, 0.4); 
                                
                vizvp->setBackgroundColour(ColourValue(0.0, 0.3, 0.2, 1));

                vizvp->setOverlaysEnabled(false);
                // Alter the camera aspect ratio to match the viewport
        mVizCamera->setAspectRatio(Real(vizvp->getActualWidth()) / 
                        Real(vizvp->getActualHeight()));
                //vizvp->setClearEveryFrame(false);

                // Create a skyplane (for visualization background)
                /*
                Plane plane;
                plane.d = -1000;
                plane.normal = Vector3::UNIT_Y;
                mSceneMgr->setSkyPlane(true, plane, "Examples/TransparentTest", 4000, 75, false);
                */
                
        }
        else
        {
                mWindow->removeViewport(VIZ_VIEWPORT_Z_ORDER);
                // if octree was enabled for visualization purpose
                mSceneMgr->setOption("ShowOctree", &mShowOctree);
        }
}
//-----------------------------------------------------------------------
void MouseQueryListener::toggleRenderNodesForViz()
{
        mRenderNodesForViz = !mRenderNodesForViz;

        mSceneMgr->setOption("RenderNodesForViz", &mRenderNodesForViz);
}
//-----------------------------------------------------------------------
void MouseQueryListener::keyPressed(KeyEvent* e)
{
        if(e->getKey() == KC_ESCAPE)
    {
                mShutdownRequested = true;
                e->consume();
                return;
        }

        CEGUI::System::getSingleton().injectKeyDown(e->getKey());
        CEGUI::System::getSingleton().injectChar(e->getKeyChar());
        e->consume();
}
//-----------------------------------------------------------------------
void MouseQueryListener::keyReleased(KeyEvent* e)
{
        CEGUI::System::getSingleton().injectKeyUp(e->getKey());
        e->consume();
}
//-----------------------------------------------------------------------
void MouseQueryListener::keyClicked(KeyEvent* e) 
{
        // Do nothing
        e->consume();
}
//-----------------------------------------------------------------------
void MouseQueryListener::AddCameraPath(SceneNode *camNode)
{
        frame_info info;
        info.orientation = mCamNode->getOrientation();
        info.position = mCamNode->getPosition();
        mCameraPath.push_back(info);
}
//-----------------------------------------------------------------------
void MouseQueryListener::SetCurrentCameraPath(SceneNode *camNode)
{
        mCamNode->setPosition(mCameraPath[mCurrentFrame].position);
        mCamNode->setOrientation(mCameraPath[mCurrentFrame].orientation);
        (mCurrentFrame++) % mCameraPath.size();
}

/**************************************************************/
/*      VisualizationRenderTargetListener implementation      */
/**************************************************************/

VisualizationRenderTargetListener::VisualizationRenderTargetListener(SceneManager *sceneMgr)
:RenderTargetListener(), mSceneMgr(sceneMgr)
{
}
//-----------------------------------------------------------------------
void VisualizationRenderTargetListener::preViewportUpdate(const RenderTargetViewportEvent &evt)
{
        const bool showViz = evt.source->getZOrder() == VIZ_VIEWPORT_Z_ORDER; // visualization viewport
        const bool nShowViz = !showViz;

    mSceneMgr->setOption("ShowVisualization", &showViz);
        mSceneMgr->setOption("SkyBoxEnabled", &nShowViz);
        //mSceneMgr->setOption("SkyPlaneEnabled", &showViz);
        
        RenderTargetListener::preViewportUpdate(evt);
}
//-----------------------------------------------------------------------
void VisualizationRenderTargetListener::postRenderTargetUpdate(const RenderTargetEvent &evt)
{
        RenderTargetListener::postRenderTargetUpdate(evt);
}
//-----------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
{
    // Create application object
    TestCullingTerrainApplication app;

        try 
        {
        app.go();
    } 
        catch( Ogre::Exception& e ) 
        {
        MessageBox( NULL, e.getFullDescription().c_str(), 
                        "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);
    }   

    return 0;
}