trouble with moving a body and the camera

maroxe

05-09-2008 18:38:17

Posted: Wed Sep 03, 2008 10:46 pm Post subject:
i istalled the 0.9 version, but know i have a probleme with my tracking camera.
if update my camera like that:

Camera->lookAt(BodyPosition());

the camera vibrates when the body moves . i didin't have this problem with blending.
but if do like that:

Camera->setAutoTrack(true, BodyNode);

it doesn't vibrate.

this a small test application:

application.h



using namespace Ogre; 





class Application : public Ogre::FrameListener 

{ 

public: 

   Root* pRoot ; 

   RenderWindow* pRenderWindow; 

   SceneManager* pSceneManager; 

   Camera* pCamera; 

   Viewport* pViewport; 



   OIS::InputManager *pInputManager; 

   OIS::Mouse *pMouse; 

   OIS::Keyboard *pKeyboard; 

   NxOgre::World* mWorld; 

   NxOgre::Body* mBody; 







public : 

   Application(); 

   ~Application(); 

   void run(); 

   virtual bool frameStarted(const Ogre::FrameEvent& evt); 

   virtual bool frameEnded(const Ogre::FrameEvent& evt); 



};

main.cpp:

#include"Ogre.h" 

#include<NxOgre.h> 

#include"OIS/OIS.h" 

#include"application.h" 



using namespace Ogre; 

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 

#define WIN32_LEAN_AND_MEAN 

#include "windows.h" 

#endif 



#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 

INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT ) 

#else 



int main(int argc, char *argv[]) 

#endif 

{ 



   try 

   { 



      Application* app = new Application; 

      app->run() ; 

   } 



   catch( Ogre::Exception& e ) 

   { 

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 

      MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL); 

#else 

      std::cerr << "An exception has occured: " <<< std::endl; 

#endif 

   } 



   return 0; 

} 

Application::Application() 

{ 

   //OGRE 



   pRoot = new Root(); 



   if(!pRoot->restoreConfig()) 

      pRoot->showConfigDialog(); 







   pRenderWindow=pRoot->initialise(true,"Ma premiere application Ogre"); 





   pSceneManager=pRoot->createSceneManager(ST_GENERIC,"MonGestionnaireDeScene"); 





   pCamera = pSceneManager->createCamera("MaCamera"); 

   pCamera->setPosition(Ogre::Vector3(100,0,0)); 



   pViewport = pRenderWindow->addViewport(pCamera); 



   Ogre::ResourceGroupManager::getSingleton().addResourceLocation("C:/OgreSDK/media/models","FileSystem","General"); 

   Ogre::ResourceGroupManager::getSingleton().addResourceLocation("C:/OgreSDK/media/materials/scripts","FileSystem","General"); 

   Ogre::ResourceGroupManager::getSingleton().addResourceLocation("C:/OgreSDK/media/materials/textures","FileSystem","General"); 

   Ogre::ResourceGroupManager::getSingleton().addResourceLocation("C:/OgreSDK/media/materials/programs","FileSystem","General"); 

   Ogre::ResourceGroupManager::getSingleton().initialiseAllResourceGroups(); 



   //PHYSX 



   mWorld = new NxOgre::World("FrameListener: Yes, log: no"); 

   NxOgre::Scene* mScene = mWorld->createScene("Paris", pSceneManager, "gravity: yes, floor: yes"); 



   mBody = mScene->createBody("OgreHead.mesh", new NxOgre::CubeShape(0.5f), Ogre::Vector3(5,30,5), "Mass: 50"); 



   pRoot->addFrameListener(this); 



   //OIS 



   OIS::ParamList pl; 

   size_t windowHnd = 0; 

   std::ostringstream windowHndStr; 

   pRenderWindow->getCustomAttribute("WINDOW", &windowHnd); 

   windowHndStr << windowHnd; 



   pl.insert(std::make_pair(std::string("WINDOW"), windowHndStr.str())); 

   pInputManager = OIS::InputManager::createInputSystem( pl ); 



   pMouse = static_cast<OIS::Mouse*>(pInputManager->createInputObject(OIS::OISMouse, false)); 

   pKeyboard = static_cast<OIS::Keyboard*>(pInputManager->createInputObject(OIS::OISKeyboard, false)); 





   unsigned int width, height, depth; 

   int top, left; 

   pRenderWindow->getMetrics(width, height, depth, left, top); 

   const OIS::MouseState &ms = pMouse->getMouseState(); 

   ms.width = width; 

   ms.height = height; 







}; 



Application::~Application() 

{ 

   delete mWorld; 

   delete pRoot; 

}; 

void Application::run() 

{ 

   pRoot->startRendering(); 

}; 



bool Application::frameStarted(const FrameEvent& evt) 

{ 

   pKeyboard->capture(); 

   if (pKeyboard->isKeyDown(OIS::KC_ESCAPE)) return false; 

   if (pKeyboard->isKeyDown(OIS::KC_UP)) mBody->addForce(Vector3(0, 0, 1000)); 

   if (pKeyboard->isKeyDown(OIS::KC_DOWN)) mBody->addForce(Vector3(0, 0, -1000)); 



   pCamera->lookAt(mBody->getGlobalPosition()); 



   return true; 

} 



bool Application::frameEnded(const FrameEvent& evt) 

{ 

   return true; 

}

PS: with belnding, i didn't have this problem

mcaden

05-09-2008 18:50:30

best solution is to upgrade to 1.0'21, otherwise you'll have to add interpolation

maroxe

05-09-2008 19:03:17

but like i said:Camera->setAutoTrack(true, BodyNode); works fine. and this this the implementation of _autotrack method:

    void Camera::_autoTrack(void)

    {

        // NB assumes that all scene nodes have been updated

        if (mAutoTrackTarget)

        {

            lookAt(mAutoTrackTarget->_getDerivedPosition() + mAutoTrackOffset);

        }

    }

so it's reaaly strange, isn't it?

maroxe

05-09-2008 21:49:38

this may be caused beacause of my ati 915 GMA?