LPDIRECT3DDEVICE9 d3dDevice; LPDIRECT3DSURFACE9 backBuffer; d3dDevice->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &backBuffer); d3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 255), 1.0f, 0); d3dDevice->BeginScene(); // Render scene here d3dDevice->EndScene(); d3dDevice->Present(NULL, NULL, NULL, NULL);In this example, we first retrieve a pointer to the back buffer using the GetBackBuffer function. We then clear the back buffer to a solid blue color using the Clear function. Next, we begin rendering the scene using the d3dDevice->BeginScene() function. Once we have finished rendering, we end the scene with the d3dDevice->EndScene() function and present the back buffer to the screen with the d3dDevice->Present() function. Package Library: The LPDIRECT3DDEVICE9 GetBackBuffer function is part of the Microsoft DirectX SDK library for C++.