hi, i tried to limit the framerate to 60 fps in the direct3d samples of the dx8sdk( in the file d3dapp.cpp ). I added the following code in Render3dEnvironment(): // Get the app''s time, in seconds. FLOAT fAppTime = DXUtil_Timer( TIMER_GETAPPTIME ); FLOAT fElapsedAppTime = DXUtil_Timer( TIMER_GETELAPSEDTIME ); if( ( 0.0f == fElapsedAppTime ) && m_bFrameMoving ) return S_OK; // !!! Code added to d3dapp.cpp // Force a given framerate Beginnnging of added code static float fNextTime; if( fAppTime >= fNextTime ) { fNextTime = fAppTime + 1.0f / m_fFramerate; } else { return S_OK; } // end of added code // FrameMove (animate) the scene if( m_bFrameMoving || m_bSingleStep ) { // Store the time for the app m_fTime = fAppTime; m_fElapsedTime = fElapsedAppTime; // Frame move the scene if( FAILED( hr = FrameMove() ) ) return hr; m_bSingleStep = FALSE; } // Render the scene as normal if( FAILED( hr = Render() ) ) return hr; // Keep track of the frame count { static FLOAT fLastTime = 0.0f; static DWORD dwFrames = 0L; FLOAT fTime = DXUtil_Timer( TIMER_GETABSOLUTETIME ); ++dwFrames; // Update the scene stats once per second if( fTime - fLastTime > 1.0f ) { m_fFPS = dwFrames / (fTime - fLastTime); fLastTime = fTime; dwFrames = 0L; // ... My problem is: the framerate in window-mode of the app is little less than 60 fps ( 59.8), but if i change to REF or to fullscreen it is much less ( 30.fps ). can anybody please help?

oh, yes you are right.
I changed something in my code for the camera and:

if( FAILED( hr = m_pInput->GetKeyboardInput( ) ) )
return DisplayErrorMsg( hr, MSGERR_APPMUSTEXIT );

if( KEYDOWN( m_pInput->m_cKeyboardbuffer, DIK_W ) )
m_pCamera->Translate( 0.0f, 0.0f, 10.0f* m_fElapsedTime );

if( KEYDOWN( m_pInput->m_cKeyboardbuffer, DIK_S ) )
m_pCamera->Translate( 0.0f, 0.0f, -10.0f * m_fElapsedTime );

// ...

i expected that the camera would translate smothly, but it laggs,
even in HAL. if i remove the "m_fElapsedTime" in the translate function it translates smothly, but then i have a different gamespeed on different computers.
Does anybody have an solution to this pronlem?

i thought i would translate based on time because it is
10.0f * m_fElapsedTime. i don''t understand this.
if i would only write translate( 10.0f ); then it would be a translation based on frames or is that not right?