i got some problem while enabling ZBuffer in d3dim. my program just display a 3d Cube and rotating it a round the y axis and everything is ok, but when i enabling ZBuffer my program just show the edges of the cube and nothing else. hu?? why?? i use this code: LPDIRECTDRAWSURFACE7 g_pddsZBuffer = NULL; DDSURFACEDESC2 ddsd; ZeroMemory(&ddsd,sizeof(ddsd)); DDPIXELFORMAT ddpfZBuffer; g_pD3D->EnumZBufferFormats( *pDeviceGUID, EnumZBufferCallback, (VOID*)&ddpfZBuffer ); // If we found a good zbuffer format, then the dwSize field will be // properly set during enumeration. Else, we have a problem and will exit. if( sizeof(DDPIXELFORMAT) != ddpfZBuffer.dwSize ) return E_FAIL; ddsd.dwSize = sizeof(DDSURFACEDESC2); ddsd.dwFlags = DDSD_CAPS/DDSD_WIDTH/DDSD_HEIGHT/DDSD_PIXELFORMAT; ddsd.ddsCaps.dwCaps = DDSCAPS_ZBUFFER; ddsd.dwWidth = 800; ddsd.dwHeight = 600; memcpy( &ddsd.ddpfPixelFormat, &ddpfZBuffer, sizeof(DDPIXELFORMAT) ); // For hardware devices, the z-buffer should be in video memory. For // software devices, create the z-buffer in system memory if( IsEqualIID( *pDeviceGUID, IID_IDirect3DHALDevice ) ) ddsd.ddsCaps.dwCaps /= DDSCAPS_VIDEOMEMORY; else ddsd.ddsCaps.dwCaps /= DDSCAPS_SYSTEMMEMORY; // Create and attach a z-buffer. Real apps should be able to handle an // error here (DDERR_OUTOFVIDEOMEMORY may be encountered). For this // tutorial, though, we are simply going to exit ungracefully. if( FAILED( hr = g_pDD->CreateSurface( &ddsd, &g_pddsZBuffer, NULL ) ) ) return hr; // Attach the z-buffer to the back buffer. if( FAILED( hr = g_pddsBackBuffer->AddAttachedSurface( g_pddsZBuffer ) ) ) return hr; of course , i enabling the z-buffer with setrenderstate. Posted By Xeno. Kobe Bryant- "Just believe in yourself"

When you actually do start the render process, make sure the zbuffer is being cleared each time.

Try lpD3DDevice->Clear(0,NULL,D3DCLEAR_ZBUFFER,0,1,0);

Edited by - Queasy on 4/22/00 4:33:11 PM

Great !!!
That really was the problem!!
thanks a lot